PowerAmp Design. Power Op Amps Evaluation Kits Accessory Modules. Full Line Catalog v4.0. Simple Power Op Amp Solutions

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1 PowerAmp Design Simple Power Op Amp Solutions Power Op Amps Evaluation Kits Accessory Modules Full Line Catalog v4.0 PowerAmp Design 3381 W Vision Dr Tucson AZ USA Tel Fax

2 An Introduction to Power Amp Design Power Amp Design specializes in high power operational amplifiers for industrial applications. With a new concept for component amplifiers, these power op amp designs feature surface mount component construction on an insulated metal substrate. An integral heat sink and fan provide optimum cooling. The new approach decreases weight and system complexity while increasing power density. Unique and compact turn-key solutions result for many high power industrial amplifier applications. These power op amp designs operate as simply as IC op amps but at far higher power levels. Power Amp Design evolved from a custom amplifier design consulting business into a catalog products business while accumulating over two decades of engineering experience in high current power amplifiers with outputs as high as 50 amps and high voltage amplifiers with outputs up to 2000 volts. Applications served by our amplifiers are as diverse as motor drives and scanning tunneling microscope transducer drives. Typical applications for amplifiers by Power Amp Design include: Sonar transducer drive Ink jet printer head drive MRI Scanning tunneling microscopes Surface scanners Magnetic deflection Motor drive Deformable mirror telescopes Mass spectrometers ATE pin drivers Vibration cancelling amplifiers Semiconductor production equipment Ultra-sound transducer drive Power Amp Design continues to offer an expanding choice of catalog products, but can also design custom amplifiers for your application, as well as modify existing designs to meet your specific requirements. For custom installations, most amplifier models are available without the heat sink and fan or can be supplied mounted to a passive heat sink. All products are manufactured in an ISO9001 facility. Each catalog product is supported by an evaluation kit, accessory modules that can modify and enhance the performance of the basic amplifier, SPICE models for your circuit simulator and application articles to expand on data sheet information. And all products are supported expert applications assistance.

3 NEW IN THIS CATALOG ISSUE v4.0 This issue includes several important changes to our catalog. Our application notes have been collected into a library document and are now separate from our catalog of products. The Application Notes Library can now be downloaded separately from the catalog of products. Our new line of compact power op amps is expanded with the low cost 100V, 5Amp, model PAD541 in a SIP package. The PAD541 has a height similar to the industry standard TO220 package used for monolithic amplifiers but the PAD541 outperforms those products. The PAD541 is useful in applications where motherboards are side by side in a card cage and board-to-board spacing is critical. Although most of our products are offered without the integrated heat sink and fan cooling for custom applications, the compact line specifies most products both with and without the heat sink and fan. The versions without the heat sink and fan are denoted by the -1 suffix. Check out the compact line of amplifiers and also the compact prices. We have consolidated our line of evaluation kits. Several of the evaluation kit models have been upgraded and modified to service several amplifier models. For example, the EVAL118 evaluation kit now services the PAD115, PAD118 and PAD119 model amplifiers. The upgrades make the evaluation kits easier to use and faster to build your application circuits. More kits now also include support for more of our accessory modules, allowing you to evaluate the amplifier/accessory module combination as well. We have also made changes to our accessory module line. The PAD125 Current Limit Accessory Module now replaces the PAD121 and PAD123 Current Limit Accessory Modules. The PAD125 covers the entire range the ±8V to ±250V and so covers amplifiers with supply voltages up to 500V total. Our rail to rail amplifier product line has also changed. The PAD117A replaces the PAD117 and PAD116 and matches the performance of both models in one new model. The A version of the PAD117 includes a supply voltage range down to ±5V with an output of 10A. We have added another RRIO model also. The new PAD137 has similar AC performance to the PAD117A but with a higher power dissipation rating of 140W, a 40% improvement over the PAD117A. And finally, we have introduced the PAD38 and PAD39 power op amps. The PAD38 and PAD39 provide a form, fit and function second-source for the industry s MP38 and MP39 amplifiers respectively.

4 Contacts: Distributors: Europe Condatas Rietbachstrasse Schlieren Schweiz/ Switzerland Tel: +41 (0) Fax: +41 (0) sales@condatas.com Israel Boran P.O. Box Hashacham St Petah-Tikva Israel support@boran.co.il Tel: Fax: Japan SEIWA Co. Matsumon Bldg2, Ohmiya-cho Nara-City, Nara, Japan akai@seiwa-jp.com Tel: Fax: Singapore, Malaysia, Indonesia, Thailand, Philippines, Vietnam & India: Champ Electronics 16 New Industrial Road #02-01/02 Hudson Techno Centre Singapore sales@champ.com.sg Tel: Fax:

5 Representatives: Texas, Oklahoma, Arkansas, Louisiana, Mexico AID Electronics, Inc 2418 Marsh Lane, Suite 102, Carrollton, TX Tel: , Fax: Massachusetts, New Hampshire, Connecticut, Rhode Island, Vermont, Maine Crawford Associates 378 South Main Street Bradford, MA Tel: FAX: Other areas in USA and Worldwide Contact Factory For Pricing and Delivery

6 Terms of Sales Product Warranty The warranty period for Power Amp Design products is 2 years from the invoice date. During this time period Power Amp Design will, at Power Amp Design's discretion, either repair or replace defective product, or refund the purchase price of product that is found by Power Amp Design to be defective by reason of defective components, workmanship or manufacturing processes. The warranty does not include fitness for use determination or product which is found to be defective by means of abuse, neglect, misapplication or any other conditions not covered by the product's specification data sheet. Power Amp Design is not liable for loss of anticipated profits, consequential damages, loss of time or losses incurred by the customer in connection with the purchase or use of its products. Shipment Options Items are shipped F.O.B. Tucson, Arizona, USA and are insured for the value of the shipment. Shipping are usually made via UPS, Federal Express, USPS, and DHL. We can ship via other carriers as requested. Shipping costs are determined and added into the final price. Customers can have shipping costs charged to their own carrier accounts if requested at time of ordering. In most cases, Power Amp Design will prepare the necessary export documentation at no charge, however, any import fees, taxes or other customs requirements are the sole responsibility of the customer. Back-ordered Items We attempt to keep a reasonable stock of all our products available for immediate shipment. In the event that an item is temporarily out of stock, it will be backordered and shipped when available. The customer has the choice of shipping those items which are currently available immediately or holding the entire order until it can be shipped complete. Order Cancellation Purchase orders for standard products which were in stock and at the quantity requested when the order was placed can be cancelled prior to shipment without incurring any re-stocking charge or other penalty. Scheduled orders can be cancelled. However, any quantity discounts already received based on a previously agreed upon schedule of shipments will be back charged to the appropriate discount level. Orders for custom manufactured products and services may be cancelled prior to completion. However, the customer will be charged a cancellation penalty as well as all related engineering, NRE, material and incidental costs which have accumulated. Sales and Use Taxes For orders shipped within the state of Arizona, customers must pay sales tax unless there is a valid Arizona Transaction Privilege Tax Exemption Certificate on file with Power Amp Design before the sale. A similar form must be filed with us from other states for which Arizona requires that we collect sales tax on orders originating in Arizona. The necessary tax will be calculated and automatically added into the final price. Customers outside Arizona are responsible for paying any taxes your state or country requires. Return of Merchandise Items purchased of 25 pieces or less per model number may be returned without incurring any re-stocking charge or other penalty if returned complete in unopened cartons and in original condition. All other returns will be accepted only with prior approval from Power Amp Design and may be subject to a 20% re-stocking charge. In general, custom or large orders of 100 pieces or more per model number cannot be returned. Items used, modified, damaged or incomplete are not returnable. Power Amp Design reserves the right to refuse any return. An R.M.A. number must be obtained from our sales department to expedite the return process. Long-Term Availability Power Amp Design is committed to providing long-term availability of all our products. We work closely with our vendors to insure component availability. Whenever possible we design using components that are available from multiple sources. In situations where a component does become obsolete we strive to design a form, fit, and function replacement. Medical Applications Policy Power Amp Design s products are not authorized for use as critical elements in life support devices or systems. Fitness for use of our products in medical applications is strictly the responsibility of the designer of the device or system utilizing any Power Amp Design product.

7 Power Amp Design Power Op Amps

8 500 PAD113 PAD126 Total Supply Voltage (Volts) PAD183 PAD135 PAD38 PAD129 PAD115 PAD PAD20 PAD112 PAD541 PAD39 PAD117A PAD137 PAD128 PAD127 PAD Continuous Current (Amps)

9 PowerAmp Design COMPACT HIGH VOLTAGE OP AMP PAD20 Rev C KEY FEATURES LOW COST HIGH VOLTAGE 150 VOLTS HIGH OUTPUT CURRENT 5A 40 WATT DISSIPATION CAPABILITY 80 WATT OUTPUT CAPABILITY INTEGRATED HEAT SINK AND FAN SMALL SIZE 40mm SQUARE APPLICATIONS SMALL MOTOR DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING DESCRIPTION The PAD20 high voltage operational amplifier is constructed with surface mount components to provide a low cost solution for many industrial applications. With a footprint only 40mm square, similar to the footprint of the TO3 hybrid package, the PAD20 offers outstanding performance that outperforms the more expensive hybrid amplifiers. External compensation tailors the amplifier s response to the application requirements. Fourwire programmable current limit is built-in. The PAD20 also features a substrate temperature reporting output and over-temp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating metal substrate mounted to an integrated heat sink and fan assembly. No BeO is used in the PAD20. The PAD20-1 is also available without the integrated heat sink and fan for custom applications. PAD20 PAD20-1 PAD20 INSTALLED IN EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP

10 COMPACT HIGH VOLTAGE OP AMP PAD20 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN +IN PINOUT & CONNECTIONS Cc AC Cc1 Cc2 OUT+VS SUB GND VIEW FROM COMPONENT SIDE IC +IL -IL SD TMP -VS * * * PHASE COMPENSATION SLEW RATE GAIN Cc 1 470pF 1V/uS > 2 220pF 2V/uS > 10 68pF 5V/uS > 20 47pF 6V/uS C2 C1 R S TO FEEDBACK & LOAD * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 2

11 PAD20 COMPACT HIGH VOLTAGE OP AMP ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 4 150V TEMPERATURE, pin solder, 10s, 300 C INPUT VOLTAGE +Vs to Vs TEMPERATURE, junction C DIFFERENTIAL INPUT VOLTAGE ± 20V TEMPERATURE RANGE, storage 40 to 70 C 5 OUTPUT CURRENT, peak, within SOA 7A TEMPERATURE RANGE, storage, PAD C POWER DISSIPATION, internal, DC 40W OPERATING TEMPERATURE, substrate 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX PAD UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vs 15 V COMMON MODE VOLTAGE RANGE Vs+8 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 10kΩ, C C =68 pf 108 db GAIN BANDWIDTH 1MHz C C =68pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 5A +Vs 7 +Vs 6 V VOLTAGE SWING I O = 5A Vs+7 Vs+6 V CURRENT, continuous, DC 5 A SLEW RATE, A V = +50 C C = 68pF 5 V/μS SETTLING TIME, to 0.1% 2V Step, C C = 68pF 4 μs RESISTANCE No load, DC 8 Ω POWER SUPPLY VOLTAGE ± 15 ± 60 ± 75 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air or case 6 Full temperature range, f 60Hz 2.1 to air 1.7 to case O C/W RESISTANCE, DC junction to air or case Full temperature range 3.1 to air 2.5 to case O C/W TEMPERATURE RANGE, substrate O C TEMPERATURE RANGE, ambient NA O C FAN, 40mm dc brushless, ball bearing OPERATING VOLTAGE 12 NA V OPERATING CURRENT 50 NA ma AIR FLOW 7.5 NA CFM RPM 7000 NA RPM NOISE 30 NA db L10, life expectancy, 50 O C 7 45 NA khrs L10, life expectancy, 25 O C 7 60 NA khrs NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 100pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life. 8. Specifications for the PAD20-1 are the same as for the PAD20 except as shown in this column. PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 3

12 COMPACT HIGH VOLTAGE OP AMP PAD20 OPERATING CONSIDERATIONS COOLING FAN The PAD20 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. CURRENT LIMIT The current limiting function of the PAD20 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.63V. Thus approximately: IL 0.63V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor from 0.4Ω-40Ω. See graph for Current Limit Value vs R S. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Figure 4 in Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. In some applications better current limiting protection and a lower sense voltage may be desired. In this case the PAD20 can be operated with the PAD125 current limit accessory module. See Figure 3 in the applications section and the PAD125 datasheet for more details. MOUNTING THE PAD20 The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. MOUNTING THE PAD20-1 AMPLIFIER In most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD20-1 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and RS forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers and torque to 4.7 in lb [53 N cm] max. Mount the amplifier to the mother board with 4-40 X 1/4 screws. See Dimensional Information for additional recommendations. TEMPERATURE REPORTING An analog output voltage is provided (pin 8, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the amplifier when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 9 ( SD ) is taken low (ground) the amplifier is turned off and remains off as long as pin 9 is low. When pin 9 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 9 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits Figure 2. PHASE COMPENSATION The PAD20 must be phase compensated. The compensation capacitor, C C, is connected between pins 2 and 3. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (150V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 47pF is not recommended. PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 4

13 COMPACT HIGH VOLTAGE OP AMP PAD20 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING PAD20 USE CASE TEMP FOR PAD20-1 USE AMBIENT TEMP FOR PAD20 PAD CASE OR AMBIENT AIR TEMPERATURE, T ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T C =25 O C, -OUTPUT T C =25 O C, +OUTPUT NORMALIZED QUIESCENT CURRENT, I Q (%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE /- SUPPLY VOLTAGE, (V) CASE TEMPERATURE, O C NORMALIZED QUIESCENT CURRENT, IQ(%) QUIESCENT CURRENT VS TEMPERATURE Av = -10 Cc = 68pF 16Ω LOAD ±Vs = ±50V HARMONIC DISTORTION 5W 50W PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP OUTPUT AMPS, A k k 30k FREQUENCY, F(Hz) 5

14 COMPACT HIGH VOLTAGE OP AMP PAD20 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE 100 Cc=470pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) CURRENT LIMIT VALUE, I(A) Ω LOAD 200mA Cc=47pF Cc=68pF Cc=220pF Cc=470pF k k 100k 1M M FREQUENCY, F(Hz) POWER RESPONSE k k k 300k FREQUENCY, F(Hz) CC=470pF CC =220pF CC =68pF CC =47pF CURRENT LIMIT VS R S T C =-25 O C -I L T C =25 O C T C =-25 O C +I L T C =25 O C T C =85 O C T C =85 O C PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=47pF Cc=68pF k k M M FREQUENCY, F(Hz) SUBSTRATE TEMPERATURE, O C Cc=220pF TEMPERATURE OUTPUT PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP CURRENT LIMIT RESISTOR, R S (Ω) 1kHz sine clipped by current limit into 15Ω load 6

15 COMPACT HIGH VOLTAGE OP AMP PAD20 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 5kHz, 2.5A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 40µS after the shutdown signal goes low. The oscilloscope display at the left shows a view of a 5kHz, 2.5A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 6µS after the shutdown signal goes low. SHUTDOWN RECOVERY The oscilloscope display at the left shows a view of a 5kHz, 2.5A p-p amplifier output signal on Ch2 resuming normal operation in the negative output direction after a shutdown signal on Ch1 go high (not shutdown). The output signal resumes normal operation after a delay of about 40µS. PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 7

16 COMPACT HIGH VOLTAGE OP AMP PAD20 PERFORMANCE GRAPHS CONTINUED Ch2, Pulse Response, 5kHz, 10Vp-p G=-10, Cc=68pF, 50Ω Load Ch2, Pulse Response, Overloaded Input, 5kHz, 100Vp-p G=-10, Cc=68pF, 50Ω Load SHUTDOWN RECOVERY The oscilloscope display at the left shows a view of a 5kHz, 2.5A p-p amplifier output signal on Ch2 resuming normal operation in the positive output direction after a shutdown signal on Ch1 go high (not shutdown). The output signal resumes normal operation after a delay of about 10µS. Ch2, Pulse Response, 5kHz, 90Vp-p G=-10, Cc=68pF, 50Ω Load 15kHz sine into 25Ω load, G=-10,C C =68pF PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 8

17 COMPACT HIGH VOLTAGE OP AMP PAD20 SAFE OPERATING AREA 10 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) DC, 30 O C AMBIENT 100mS PULSE 3% DUTY CYCLE 10mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD20 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1S 10S 50S 1mS ] ] ] 100μS 10μS PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 9

18 COMPACT HIGH VOLTAGE OP AMP PAD20 DIMENSIONAL INFORMATION PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 10

19 COMPACT HIGH VOLTAGE OP AMP PAD20 DIMENSIONAL INFORMATION CONTINUED PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 11

20 COMPACT HIGH VOLTAGE OP AMP PAD20 APPLICATION CIRCUITS R F IN 0 R 0 IN 5V 5.1k SD 9 12 IC 11 +IL 10 -IL OUT 5 FIGURE 1. 4-WIRE CURRENT LIMIT 2N2222 TRANSISTOR CIRCUIT 5V 5V SD 9 R P R HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR S R L PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 12

21 COMPACT HIGH VOLTAGE OP AMP PAD20 APPLICATION CIRCUITS AC Cc1 Cc2 OUT+VS SUB GND PAD20 VIEW FROM COMPONENT SIDE RESET -IN +IN OUT SD IC +IL -IL SD TMP -VS STATUS GND -Vs NC +IL IL IC +Vs PAD125 VIEW FROM COMPONENT SIDE R S NC TO FEEDBACK & LOAD FIGURE 3 TYPICAL CONNECTIONS TO PAD125 CURRENT LIMIT ACCESSORY MODULE PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 13

22 COMPACT HIGH VOLTAGE OP AMP PAD20 APPLICATION CIRCUITS FIGURE 4 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT With the three current limit function pins (pins 10-12) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and R S can be calculated using the PAD Power Excel spreadsheet that can be downloaded from the Power Amp Design web site under the Design Spreadsheet tab. PowerAmp Design PAD20 COMPACT HIGH VOLTAGE OP AMP 14

23 PowerAmp Design POWER OPERATIONAL AMPLIFIER KEY FEATURES HIGH VOLTAGE 200 VOLTS HIGH CURRENT 10 AMPS 125 WATT DISSIPATION CAPABILITY HIGH SLEW RATE- 10V/µS FOUR WIRE CURRENT LIMIT APPLICATIONS LINEAR AND ROTARY MOTOR DRIVE YOKE/MAGNETIC FIELD EXCITATION PROGRAMMABLE POWER SUPPLIES INDUSTRIAL (PA) AUDIO DESCRIPTION The PAD38 is a power operational amplifier constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 3.3in 2 the PAD38 offers outstanding performance that rivals more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. Programmable current limit is builtin. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate. No BeO is used in the PAD38. The resulting module is a small, high performance solution for many industrial applications. PAD38 Rev B PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER

24 POWER OPERATIONAL AMPLIFIER PAD38 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -ILIM -IN +IN GND NC -VB IQ +ILIM NC NC PINOUT & CONNECTIONS Cc VB GND NC Cc2 NC Cc1 NC NC NC NC NC +Vs VIEW FROM COMPONENT SIDE C4 + PHASE COMPENSATION TYP. SLEW RATE GAIN Cc 1 470pF 4V/uS 3 220pF 9V/uS > 5 100pF 15V/uS > 12 47pF 20V/uS -Vs OUT C3 -Vs R S C2 + C1 TO FEEDBACK & LOAD PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 2

25 PAD38 POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 200V TEMPERATURE, pin solder, 10s 200C BOOST VOLTAGE, ±Vs ±20V TEMPERATURE, junction C OUTPUT CURRENT, within SOA 25A TEMPERATURE RANGE, storage 40 to 105 C POWER DISSIPATION, internal, DC 125W OPERATING TEMPERATURE, case 40 to 105 C INPUT VOLTAGE, differential ± 20V INPUT VOLTAGE, common mode ±V B PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +V B 15 V COMMON MODE VOLTAGE RANGE V B +7 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 10kΩ, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 2 MHz PHASE MARGIN Full temperature range degree OUTPUT VOLTAGE SWING I O = 10A ±Vs 8 +Vs 6.6 V VOLTAGE SWING I O = 10A Vs+7 Vs+6 V VOLTAGE SWING +V B =+Vs+10V, I O = 10A +Vs 2 +Vs 1.2 VOLTAGE SWING -V B =-Vs-10V, I O = -10A -Vs 2.8 +Vs+2.2 CURRENT, continuous, DC A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step, C C = 100pF 2.5 μs RESISTANCE No load, DC 4 Ω POWER SUPPLY VOLTAGE ± 15 ± 75 ± 100 V CURRENT, quiescent, boost supply 22 ma CURRENT, total 26 ma THERMAL RESISTANCE, AC, junction to air 5 Full temperature range, f 60Hz 0.9 RESISTANCE, DC junction to air, outputs Full temperature range 1.2 TEMPERATURE RANGE, heat sink NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages to the output stage. +V B and V B denote the positive and negative supply voltages to the input stages. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +V B and V B must not be less than +Vs and Vs respectively. Total voltage +V B to V B 240V maximum. 8. The PAD38 is constructed with MOSFET transistors and ESD handling procedures must be observed. O C/W O C/W O C PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 3

26 POWER OPERATIONAL AMPLIFIER PAD38 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD38 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. CURRENT LIMIT The current limiting function of the PAD38 is a versatile circuit that can be used to implement a four-wire current limit configuration. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1 below. The sense voltage for current limit is 0.7V. Thus: IL 0.7V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. IN R IN R RS 24 +ILIM 23 PAD38 -ILIM OUT F Figure 1 MOUNTING THE AMPLIFIER In most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD38 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers. Mount the amplifier to the mother board with 4-40 X 1/4 screws. R P R S R L PHASE COMPENSATION The PAD38 must be phase compensated. The compensation capacitor, C C, is connected between pins 4 and 6. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (200V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 100pF is not recommended. USING THE IQ PIN FUNCTION When pin 25 (IQ) is tied to pin 6 (Cc1) the class AB bias of the output stage becomes C bias. The quiescent current of the PAD38 typically drops by 10mA. In some applications the reduced quiescent current is important. However, note that applying this option will raise the output impedance of the amplifier which may change the stability of the circuit and will increase crossover distortion also. BOOST OPERATION The small signal stages of the PAD38 are connected to the ±V B power supply pins. When the ±V B voltages are greater than the ±Vs power supply pins the small signal stages of the amplifier are biased so that the output transistors can be driven very close to the ±Vs rails. Close swings to the supply rails increase the efficiency of the amplifier and make better use the supply voltages. This technique is often used to operate the amplifier with only a single high current power supply, thus reducing the system size and cost. Also see the application article AN-22 Single Supply Operation with Power Op Amps for more detailed information and circuits. PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 4

27 POWER OPERATIONAL AMPLIFIER PAD38 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING CASE TEMPERATURE, T C ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS TJ=25 O C +OUTPUT, +VB=+VS -OUTPUT -VB=-VS -OUTPUT, -VB=-VS-10V +OUTPUT, +VB=+VS+10V OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C HARMONIC DISTORTION Av = -10 Cc = 100pF 8Ω LOAD ±Vs = ±38V k k 30k FREQUENCY, F(Hz) 5W 50W PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 5

28 POWER OPERATIONAL AMPLIFIER PAD38 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Ω LOAD I O =500mA DC Cc=100pF Cc=470pF Cc=220pF Cc=47pF k k k 1M 3M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF CC=220pF CC =100pF k k k M FREQUENCY, F(Hz) CC =47pF PHASE, Θ( O ) Cc=470pF Cc=220pF Cc=100pF Cc=47pF k k M 3M FREQUENCY, F(Hz) 10kHz square into 8Ω load, G= 10,C C =100pF, Vs=±50V PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 1kHz sine clipped by current limit into 100Ω load 30kHz sine into 8Ω load, G= 10,C C =100pF, Vs=±50V 6

29 POWER OPERATIONAL AMPLIFIER PAD38 SAFE OPERATING AREA 30 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) PULSE 3% DUTY CYCLE 10mS 25 O C 85 O C 125 O C 1mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 7

30 POWER OPERATIONAL AMPLIFIER PAD38 DIMENSIONAL INFORMATION PowerAmp Design PAD38 POWER OPERATIONAL AMPLIFIER 8

31 PowerAmp Design POWER OPERATIONAL AMPLIFIER KEY FEATURES HIGH VOLTAGE 100 VOLTS HIGH CURRENT 10 AMPS 125 WATT DISSIPATION CAPABILITY HIGH SLEW RATE- 10V/µS FOUR WIRE CURRENT LIMIT OPTIONAL BOOST VOLTAGE INPUTS APPLICATIONS LINEAR AND ROTARY MOTOR DRIVE YOKE/MAGNETIC FIELD EXCITATION PROGRAMMABLE POWER SUPPLIES INDUSTRIAL (PA) AUDIO DESCRIPTION The PAD39 is a power operational amplifier constructed with surface mount components to provide a cost effective solution for many industrial applications With a footprint only 3.3in 2 the PAD39 offers outstanding performance that rivals more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. Programmable current limit is builtin. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate. No BeO is used in the PAD39. The resulting module is a small, high performance solution for many industrial applications. PAD39 Rev B PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER

32 POWER OPERATIONAL AMPLIFIER PAD39 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -ILIM -IN +IN GND NC -VB IQ +ILIM NC NC PINOUT & CONNECTIONS Cc VB GND NC Cc2 NC Cc1 NC NC NC NC NC +Vs VIEW FROM COMPONENT SIDE C4 + PHASE COMPENSATION TYP. SLEW RATE GAIN Cc 1 470pF 4V/uS 3 220pF 9V/uS > 5 100pF 15V/uS > 12 47pF 20V/uS -Vs OUT C3 -Vs R S C2 + C1 TO FEEDBACK & LOAD PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER 2

33 PAD39 POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 100V TEMPERATURE, pin solder, 10s 200C BOOST VOLTAGE, ±Vs ±20V TEMPERATURE, junction C OUTPUT CURRENT, within SOA 25A TEMPERATURE RANGE, storage 40 to 105 C POWER DISSIPATION, internal, DC 125W OPERATING TEMPERATURE, case 40 to 105 C INPUT VOLTAGE, differential ± 20V INPUT VOLTAGE, common mode ±V B PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +V B 15 V COMMON MODE VOLTAGE RANGE V B +7 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 10kΩ, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 2 MHz PHASE MARGIN Full temperature range degree OUTPUT VOLTAGE SWING I O = 10A ±Vs 8 +Vs 6.6 V VOLTAGE SWING I O = 10A Vs+7 Vs+6 V VOLTAGE SWING +V B =+Vs+10V, I O = 10A +Vs 2 +Vs 1.2 VOLTAGE SWING -V B =-Vs-10V, I O = -10A -Vs 2.8 +Vs+2.2 CURRENT, continuous, DC A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step, C C = 100pF 2.5 μs RESISTANCE No load, DC 4 Ω POWER SUPPLY VOLTAGE ± 15 ± 40 ± 50 V CURRENT, quiescent, boost supply 22 ma CURRENT, total 26 ma THERMAL RESISTANCE, AC, junction to air 5 Full temperature range, f 60Hz 0.9 O C/W RESISTANCE, DC junction to air, outputs Full temperature range 1.2 O C/W TEMPERATURE RANGE, heat sink O C NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages to the output stage. +V B and V B denote the positive and negative supply voltages to the input stages. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +V B and V B must not be less than +Vs and Vs respectively. Total voltage +V B to V B 120V maximum. 8. The PAD39 is constructed with MOSFET transistors and ESD handling procedures must be observed. PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER 3

34 POWER OPERATIONAL AMPLIFIER PAD39 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD39 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. CURRENT LIMIT The current limiting function of the PAD39 is a versatile circuit that can be used to implement a four-wire current limit configuration. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1 below. The sense voltage for current limit is 0.7V. Thus: IL 0.7V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. IN R IN R F RS 24 +ILIM 23 -ILIM Figure 1 OUT MOUNTING THE AMPLIFIER In most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD39 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers. Mount the amplifier to the mother board with 4-40 X 1/4 screws. R P R S R L PHASE COMPENSATION The PAD39 must be phase compensated. The compensation capacitor, C C, is connected between pins 4 and 6. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 100pF is not recommended. USING THE IQ PIN FUNCTION When pin 25 (IQ) is tied to pin 6 (Cc1) the class AB bias of the output stage becomes C bias. The quiescent current of the PAD39 typically drops by 10mA. In some applications the reduced quiescent current is important. However, note that applying this option will raise the output impedance of the amplifier which may change the stability of the circuit and will also increase crossover distortion. BOOST OPERATION The small signal stages of the PAD39 are connected to the ±V B power supply pins. When the ±V B voltages are greater than the ±Vs power supply pins the small signal stages of the amplifier are biased so that the output transistors can be driven very close to the ±Vs rails. Close swings to the supply rails increase the efficiency of the amplifier and make better use the supply voltages. This technique is often used to operate the amplifier with only a single high current power supply, thus reducing the system size and cost. 4 PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER

35 POWER OPERATIONAL AMPLIFIER PAD39 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING CASE TEMPERATURE, T C ( O C) OFFSET VOLTAGE DRIFT CASE TEMP, O C OUTPUT SWING FROM SUPPLY RAILS TJ=25 O C +OUTPUT, +VB=+VS -OUTPUT -VB=-VS -OUTPUT, -VB=-VS-10V +OUTPUT, +VB=+VS+10V OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C HARMONIC DISTORTION Av = -10 Cc = 100pF 8Ω LOAD ±Vs = ±38V k k 30k FREQUENCY, F(Hz) 5W 50W PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER 5

36 POWER OPERATIONAL AMPLIFIER PAD39 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Ω LOAD I O =500mA DC Cc=100pF Cc=470pF Cc=220pF Cc=47pF k k k 1M 3M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF k k k M FREQUENCY, F(Hz) CC =220pF CC =100pF CC =47pF PHASE, Θ( O ) Cc=470pF Cc=220pF Cc=100pF Cc=47pF k k M 3M FREQUENCY, F(Hz) 10kHz square into 8Ω load, G= 10,C C =100pF, Vs=±50V PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER 1kHz sine clipped by current limit into 100Ω load 30kHz sine into 8Ω load, G= 10,C C =100pF, Vs=±50V 6

37 POWER OPERATIONAL AMPLIFIER PAD39 SAFE OPERATING AREA 30 SAFE OPERATING AREA 1mS OUTPUT CURRENT, Io (A) PULSE 3% DUTY CYCLE 25 O C 85 O C 125 O C 10mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER 7

38 POWER OPERATIONAL AMPLIFIER PAD39 DIMENSIONAL INFORMATION PowerAmp Design PAD39 POWER OPERATIONAL AMPLIFIER 8

39 PowerAmp Design HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 Rev C KEY FEATURES LOW COST HIGH VOLTAGE 150 VOLTS HIGH OUTPUT CURRENT 5 AMPS 50 WATT DISSIPATION CAPABILITY 100 WATT OUTPUT CAPABILITY INTEGRATED HEAT SINK AND FAN COMPATIBLE WITH PAD123 MODULE APPLICATIONS LINEAR MOTOR DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING DESCRIPTION The PAD112 high voltage operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 3.8 in 2 the PAD112 offers outstanding performance that rivals more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. Four-wire programmable current limit is built-in but the PAD112 is also compatible with the precision PAD123 Current Limit Accessory Module. The PAD112 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the PAD112. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD112 INSTALLED IN EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER

40 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN +IN PINOUT & CONNECTIONS * * * AC NC +Vcc Cc2 Cc1 TMP SD OUT1 SUB GND +HV NC -Vcc Cc VIEW FROM COMPONENT SIDE PHASE COMPENSATION GAIN Cc 1 470pF > pF NC NC NC IC +IL -IL OUT2 -HV * * * SLEW RATE 3.7V/uS 14V/uS C2 C1 R S TO FEEDBACK & LOAD * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 2

41 PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +HV to HV 150V INPUT VOLTAGE +Vcc to Vcc SUPPLY VOLTAGE, +Vcc to Vcc 150V DIFFERENTIAL INPUT VOLTAGE ± 20V SUPPLY VOLTAGE, +Vcc +HV+15V 7 TEMPERATURE, pin solder, 10s 300 C SUPPLY VOLTAGE, Vcc HV-15V 7 TEMPERATURE, junction C OUTPUT CURRENT, peak 10A, within SOA TEMPERATURE RANGE, storage 40 to 70 C 5 POWER DISSIPATION, internal, DC 50W OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vcc 15 V COMMON MODE VOLTAGE RANGE Vcc+7 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 10kΩ, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 2 MHz PHASE MARGIN Full temperature range 45 degree OUTPUT VOLTAGE SWING I O = 5A +HV 7 +HV 6 V VOLTAGE SWING I O = 5A HV+7 HV+6 V CURRENT, continuous, DC 5 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step, C C = 100pF 6 μs RESISTANCE No load, DC 8 Ω POWER SUPPLY VOLTAGE ± 15 ± 50 ± 75 V CURRENT, quiescent ma CURRENT, shutdown, pin 7 low ma THERMAL RESISTANCE, AC, junction to air 6 Full temperature range, f 60Hz 2 O C/W RESISTANCE, DC junction to air, outputs Full temperature range 2.7 O C/W TEMPERATURE RANGE, heat sink O C FAN, 40mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 50 ma AIR FLOW 7.5 CFM RPM 7000 RPM NOISE 30 db L10, life expectancy, 50 O C 8 45 khrs L10, life expectancy, 25 O C 8 60 khrs NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +HV and HV denote the positive and negative supply voltages to the output stage. +Vcc and Vcc denote the positive and negative supply voltages to the input stages. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C or more the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +Vcc and Vcc must not be less than +HV and HV respectively. Total voltage +Vcc to Vcc 150V maximum. 8. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life. PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 3

42 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD112 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. COOLING FAN The PAD112 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. CURRENT LIMIT The current limiting function of the PAD112 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.65V. Thus: IL 0.65V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. The PAD112 is also compatible with the precision PAD125 Current Limit Accessory Module. See Figure 4 and the datasheet for the PAD125 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. RS TEMPERATURE REPORTING An analog output voltage is provided (pin 6, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the amplifier when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 7 ( SD ) is taken low (ground) the amplifier is turned off and remains off as long as pin 7 is low. When pin 7 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 7 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status when temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. PHASE COMPENSATION The PAD112 must be phase compensated. The compensation capacitor, C C, is connected between pins 4 and 5. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (150V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 100pF is not recommended. PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 4

43 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T C =25 O C, -OUTPUT T C =25 O C, +OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 8Ω LOAD ±Vs = ±45V 7.6W HARMONIC DISTORTION 76W k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 5

44 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=470pF Cc=100pF k k 100k 1M M FREQUENCY, F(Hz) POWER RESPONSE k k k 300k FREQUENCY, F(Hz) 1kHz sine clipped by current limit into 100Ω load CC=470pF CC=100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=470pF Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz sine into 8Ω load, G=-10,C C =100pF PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 6

45 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 10kHz 2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 20µS after the shutdown signal goes low. Pulse Response, Negative to Positive, 250Ω Load G=-10, Cc=100pF SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows a view of a 10kHz 2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 20µS after the shutdown signal goes low. Pulse Response, Positive to Negative, 250Ω Load G=-10, Cc=100pF PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 7

46 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RECOVERY TO NEGATIVE OUTPUT TRANSITION The oscilloscope display at the left shows a view of a 10kHz, 2A p-p amplifier output signal on Ch2 recovering from a shutdown signal on Ch1(high on Ch1 means not shutdown). The output recovers to its expected output near the negative peak in less than 40µS. SHUTDOWN RECOVERY TO POSITIVE OUTPUT TRANSITION The oscilloscope display at the left shows a view of a 10kHz, 2A p-p amplifier output signal on Ch2 recovering from a shutdown signal on Ch1 (high on Ch1 means not shutdown). The output recovers to its expected output near the positive peak after about 40µS. PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 8

47 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) SAFE OPERATING AREA DC, 30 O C AMBIENT PULSE 3% DUTY CYCLE 100mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD112 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1S 10S 50S 10mS 1mS 100μS ] ] ] 10μS PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 9

48 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 DIMENSIONAL INFORMATION PADXXX PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 10

49 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 APPLICATION CIRCUITS R F IN R IN 0 0 5V k SD 7 15 IC 14 +IL 13 -IL OUT 9,12 FIGURE 1. 4-WIRE CURRENT LIMIT 2N2222 TRANSISTOR CIRCUIT 5V 5V SD 7 R P R HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR S R L PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 11

50 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 APPLICATION CIRCUITS 10k TMP SD GND 2200pF TMP MONITOR MONITOR 2200pF FIGURE 3 MONITORING TMP AND SD OUTPUTS -IN +IN AC NC +Vcc Cc2 Cc1 TMP SD OUT1 SUB GND +HV PAD112 VIEW FROM COMPONENT SIDE NC -Vcc NC NC NC IC +IL -IL OUT2 -HV RESET OUT SD STATUS GND -Vs NC +IL IL IC PAD125 VIEW FROM COMPONENT SIDE C2 C1 R S TO FEEDBACK & LOAD FIGURE 4 TYPICAL PAD112 CONNECTIONS TO PAD125 ACCESSORY MODULE +Vs NC PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 12

51 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD112 APPLICATION CIRCUITS FIGURE 5 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT With the three current limit function pins (pins 13-15) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and R S can be calculated using the PAD Power spreadsheet that can be downloaded from the Power Amp Design web site. Fold-over current limit can also be achieved when using the PAD123 Current Limit Accessory Module. See the datasheet for the PAD123 for further details. PowerAmp Design PAD112 HIGH VOLTAGE OPERATIONAL AMPLIFIER 13

52 PowerAmp Design HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 Rev H KEY FEATURES LOW COST HIGH VOLTAGE 500 VOLTS HIGH OUTPUT CURRENT 1.5A 29 WATT DISSIPATION CAPABILITY 97 WATT OUTPUT CAPABILITY INTEGRATED HEAT SINK AND FAN APPLICATIONS PIEZO TRANSDUCER DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING DESCRIPTION The PAD113 high voltage operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 3.8 in 2 the PAD113 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. Four-wire programmable current limit is built-in. The PAD113 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the PAD113. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD113 INSTALLED IN EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER

53 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN +IN PINOUT & CONNECTIONS * * * AC NC +Vcc Cc2 Cc1 TMP SD OUT1 SUB GND +HV NC -Vcc Cc VIEW FROM COMPONENT SIDE PHASE COMPENSATION GAIN Cc 1 150pF > 15 33pF > 50 10pF NC NC NC IC +IL -IL OUT2 -HV * * * SLEW RATE 3V/uS 25V/uS 40V/uS C2 C1 R S TO FEEDBACK & LOAD * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 2

54 PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +HV to HV 500V INPUT VOLTAGE +Vcc to Vcc SUPPLY VOLTAGE, +Vcc to Vcc 500V DIFFERENTIAL INPUT VOLTAGE ± 20V SUPPLY VOLTAGE, +Vcc +HV+15V 7 TEMPERATURE, pin solder, 10s 300 C SUPPLY VOLTAGE, Vcc HV-15V 7 TEMPERATURE, junction C OUTPUT CURRENT, peak 1.5A, within SOA TEMPERATURE RANGE, storage 40 to 70 C 5 POWER DISSIPATION, internal, DC 29W Total OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vcc 15 V COMMON MODE VOLTAGE RANGE Vcc+7 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 10kΩ, C C =2.7pF 108 db GAIN BANDWIDTH 1MHz 4 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 1A +HV 8 +HV 6 V VOLTAGE SWING I O = 1A HV+8 HV+6 V CURRENT, continuous, DC 1.5 A SLEW RATE, A V = 100 C C = 10pF 40 V/μS SETTLING TIME, to 0.1% 2V Step, Cc=10pF 5 μs RESISTANCE No load, DC 15 Ω POWER SUPPLY VOLTAGE ± 40 ± 225 ± 250 V CURRENT, quiescent ma CURRENT, shutdown, pin 7 low ma THERMAL RESISTANCE, AC, junction to air 6 Full temperature range, f 60Hz 2.6 O C/W RESISTANCE, DC junction to air, outputs Full temperature range 4.3 O C/W TEMPERATURE RANGE, heat sink O C FAN, 40mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 5 CFM RPM 8000 RPM NOISE 31 db L10, life expectancy, 50 O C 8 45 khrs L10, life expectancy, 25 O C 8 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=220pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +HV and HV denote the positive and negative supply voltages to the output stage. +Vcc and Vcc denote the positive and negative supply voltages to the input stages. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C or more the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +Vcc and Vcc must not be less than +HV and HV respectively. Total voltage +Vcc to Vcc 500V maximum. 8. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life. PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 3

55 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD113 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. See application note AN-16 for PCB layout guidelines. EXTERNAL CIRCUIT COMPONENTS The output of the PAD113 can swing up to +/- 240V and this may stress or destroy external components that are often not seriously considered when developing circuits with small signal op amps. High voltage rated resistors may be purchased for the feedback circuit or, alternately, several ordinary resistors may be placed in series to obtain the proper voltage rating. The compensation capacitor C C is a NPO type and is rated for 500V. See AN-16 for PCB layout guidelines. COOLING FAN The PAD113 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. CURRENT LIMIT The current limiting function of the PAD113 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.63V. Thus approximately: IL 0.63V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor from 0.4Ω-40Ω. See graph for Current Limit Value vs R S. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. The PAD113 is also compatible with the precision PAD125 Current Limit Accessory Module. See Figure 4 and the datasheet for the PAD125 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to RS 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 6, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the amplifier when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 7 ( SD ) is taken low (ground) the amplifier is turned off and remains off as long as pin 7 is low. When pin 7 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 7 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status when temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. PHASE COMPENSATION The PAD113 must be phase compensated. The compensation capacitor, C C, is connected between pins 4 and 5. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (500V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 10pF is not recommended. PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 4

56 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T C =25 O C, +OUTPUT T C =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C 1 Av = -50 Cc = 10pF 32Ω LOAD ±Vs = ±60V HARMONIC DISTORTION 3.6W 36W k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 5

57 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) CURRENT LIMIT VALUE, I(A) Cc=150pF Cc=10pF Cc=33pF k k 100k 1M M FREQUENCY, F(Hz) k k k 300k FREQUENCY, F(Hz) POWER RESPONSE CC =150pF CC =33pF CC =10pF CURRENT LIMIT VS R S T C =-25 O C -I L T C =25 O C T C =-25 O C +I L T C =25 O C T C =85 O C T C =85 O C CURRENT LIMIT RESISTOR, R S (Ω) PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=150pF Cc=33pF Cc=10pF k k M M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 1kHz sine clipped by current limit into 250Ω load PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 6

58 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 5kHz, 1A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 50µS after the shutdown signal goes low. SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows a view of a 5kHz, 1A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 150µS after the shutdown signal goes low. SHUTDOWN RECOVERY The oscilloscope display at the left shows a view of a 5kHz, 1A p-p amplifier output signal on Ch2 resuming normal operation after a shutdown signal on Ch1 go high (not shutdown). The output signal resumes normal operation after a delay of about 1mS. PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 7

59 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 PERFORMANCE GRAPHS CONTINUED Pulse Response, 20kHz, 200Vp-p G=-50, Cc=10pF Pulse Response, Overloaded Input, 20kHz, 200Vp-p G=-50, Cc=10pF Pulse Response, 20kHz, 20Vp-p G=-50, Cc=10pF 10kHz sine into 250Ω load, G=-50,C C =10pF PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 8

60 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) SAFE OPERATING AREA DC, 30 O C AMBIENT 1S PULSE 3% DUTY CYCLE 10mS 100mS 10S 50S SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD112 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1mS ] ] ] 100μS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 9

61 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 DIMENSIONAL INFORMATION PADXXX PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 10

62 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 APPLICATION CIRCUITS R F IN R IN 0 0 5V k SD 7 15 IC 14 +IL 13 -IL OUT 9,12 FIGURE 1. 4-WIRE CURRENT LIMIT 2N2222 TRANSISTOR CIRCUIT 5V 5V SD 7 R P R HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR S R L PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 11

63 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 APPLICATION CIRCUITS 10k TMP SD GND 2200pF TMP MONITOR MONITOR 2200pF FIGURE 3 MONITORING TMP AND SD OUTPUTS -IN +IN AC NC +Vcc Cc2 Cc1 TMP SD OUT1 SUB GND +HV PAD113 VIEW FROM COMPONENT SIDE NC -Vcc NC NC NC IC +IL -IL OUT2 -HV RESET OUT SD STATUS GND -Vs NC +IL IL PAD125 VIEW FROM COMPONENT SIDE FIGURE 4 TYPICAL PAD113 CONNECTIONS TO PAD125 ACCESSORY MODULE IC +Vs NC C2 C1 R S TO FEEDBACK & LOAD PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 12

64 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD113 APPLICATION CIRCUITS FIGURE 5 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT With the three current limit function pins (pins 13-15) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and R S can be calculated using the PAD Power Excel spreadsheet that can be downloaded from the Power Amp Design web site under the Design Spreadsheet tab. PowerAmp Design PAD113 HIGH VOLTAGE OPERATIONAL AMPLIFIER 13

65 PowerAmp Design HIGH POWER OPERATIONAL AMPLIFIER PAD115 Rev C KEY FEATURES LOW COST HIGH VOLTAGE 300 VOLTS HIGH OUTPUT CURRENT UP TO 30A 165 WATT DISSIPATION CAPABILITY 400 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE ± 10V ± 150V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS DESCRIPTION The PAD115 high power operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 5.6 sq. in. the PAD115 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD115 also features a substrate temperature reporting output and overtemp shutdown and is also compatible with the PAD123 Current Limit Accessory Module. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD115 MOUNTED IN EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

66 HIGH POWER OPERATIONAL AMPLIFIER PAD115 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT AMPLIFIER PINOUT & CONNECTIONS Cc BALSUB +Vcc Cc1 Cc2 NC OUT1 +Vs VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC -Vs OUT PHASE COMPENSATION GAIN Cc SLEW V/uS 1 >10 470pF 100pF 2 6 C4 + C C2 + C1 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. TO FEEDBACK & LOAD PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 2

67 PAD115 HIGH POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 7 300V INPUT VOLTAGE +Vcc to Vcc 7 SUPPLY VOLTAGE +Vcc to Vcc 320V 7 DIFFERENTIAL INPUT VOLTAGE ± 20V OUTPUT CURRENT, peak 30A, within SOA TEMPERATURE, pin solder, 10s 300 C POWER DISSIPATION, internal, DC 165W TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vcc m 10 V COMMON MODE REJECTION, DC 92 db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 100Ω, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 20A +Vs 6.1 V VOLTAGE SWING I O = 20A Vs+6.1 V CURRENT, continuous, DC 20 A CURRENT, peak within SOA 30 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω POWER SUPPLY VOLTAGE 7 ± 10 ± 125 ± 150 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz.46 O C/W RESISTANCE, DC, junction to air Full temperature range.76 O C/W TEMPERATURE RANGE, heat sink O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan storage characteristics. During operation, even though the case may be at 85 O C the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. MTBF (Mean Time Before Failure), on the other hand, refers to a 50% failure rate. The MTBF of fans used by Power Amp Design is 210 khrs at 50C. 7. +Vcc and Vcc must not be more than 20V greater than +Vs and Vs respectively PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 3

68 HIGH POWER OPERATIONAL AMPLIFIER PAD115 OPERATING CONSIDERATIONS COOLING FAN The PAD115 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corner of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. PHASE COMPENSATION The PAD115 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (300V). On page 2, under Amplifier Pinout & Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. A compensation capacitor less than 100pF is not recommended. TEMPERATURE REPORTING An analog output voltage is provided (pin 24, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 26 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 26 is low. When pin 26 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 26 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. CURRENT LIMIT The PAD115 does not have a current limiting circuit built in. However, a Current Limit Accessory Module, model PAD125, is available if the current limiting function is needed for the application. See the PAD125 data sheet and Application Circuits for a typical connection diagram. PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 4

69 HIGH POWER OPERATIONAL AMPLIFIER PAD115 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =25 O C, +OUTPUT T J =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C HARMONIC DISTORTION Av = -10 Cc = 100pF 8Ω LOAD ±Vs = ±60V 15W 150W k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 5

70 HIGH POWER OPERATIONAL AMPLIFIER PAD115 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE Cc=470pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=470pF Cc=100pF k k k 1M 2M FREQUENCY, F(Hz) POWER RESPONSE CC =470pF CC =100pF k k k FREQUENCY, F(Hz) 80V p-p 20kHz into 4Ω load, G=-10, Cc=100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz into 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 6

71 HIGH POWER OPERATIONAL AMPLIFIER PAD115 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2.5µS after the shutdown signal goes low. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 1.5µS after the shutdown signal goes low. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 7

72 HIGH POWER OPERATIONAL AMPLIFIER 40 SAFE OPERATING AREA PAD115 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) 10 DC, 30 O C AMBIENT 1S 10S 50S PULSE 3% DUTY CYCLE ] ] ] 100mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD115 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10mS 1mS 100μS PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 8

73 HIGH POWER OPERATIONAL AMPLIFIER PAD115 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 9

74 HIGH POWER OPERATIONAL AMPLIFIER PAD115 APPLICATION CIRCUITS SD IN 30 5V 5.1k 5V 2N2222 TRANSISTOR CIRCUIT 5V SD 26 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT +IN 29 FIGURE 1. EXTERNAL SHUTDOWN WITH MONITOR BAL SUB+Vcc Cc1 Cc2 NC -Vcc 28 NC RESET PAD115 VIEW FROM COMPONENT SIDE SD 26 OUT GND 25 SD TMP 24 STATUS NC GND OUT1 +Vs -Vs -Vs OUT NC +IL IL IC +Vs PAD125 VIEW FROM COMPONENT SIDE R S TO FEEDBACK & LOAD FIGURE 2. TYPICAL PAD115 CONNECTIONS TO PAD125 ACCESSORY MODULE NC PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 10

75 HIGH POWER OPERATIONAL AMPLIFIER PAD115 APPLICATION CIRCUITS 10k 2200pF TMP GND SD TMP MONITOR MONITOR 2200pF FIGURE 3. MONITORING TMP AND SD OUTPUTS PowerAmp Design PAD115 HIGH POWER OPERATIONAL AMPLIFIER 11

76 PowerAmp Design RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A Rev I KEY FEATURES LOW COST RAIL TO RAIL INPUT & OUTPUT SINGLE SUPPLY OPERATION HIGH VOLTAGE 100 VOLTS HIGH OUTPUT CURRENT 15A 250 WATT OUTPUT CAPABILITY 100 WATT DISSIPATION CAPABILITY WIDE SUPPLY RANGE ± 5V ± 50V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMP SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION DESCRIPTION The PAD117A rail to rail operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications where it is important to obtain a maximum output signal with limited supply voltages. With a footprint only 5.6 in 2 the PAD117A offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. Four-wire programmable current limit is built-in, but the PAD117A is compatible with the external PAD125 current limit accessory module as well. The PAD117A also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the PAD117A. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD117A mounted in EVAL117 evaluation kit with accessory modules. A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER

77 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT AMPLIFIER PINOUT & CONNECTIONS Cc * * * AC +VB +Vcc Cc2 Cc1 TMPGND SD SUBOUT VIEW FROM COMPONENT SIDE -VB -IN +IN -Vcc NC NC OUT NC +IL -IL IC * * * PHASE COMPENSATION GAIN Cc 1 470pF 3 220pF > pF SLEW RATE 1.6V/uS 4V/uS 8V/uS OUT1 +Vs OUT2 -Vs C4 + C4 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. R S C2 + C1 TO FEEDBACK & LOAD PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 2

78 PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 7 100V INPUT VOLTAGE +Vs to Vs OUTPUT CURRENT, peak 30A, within SOA DIFFERENTIAL INPUT VOLTAGE ± 20V POWER DISSIPATION, internal, DC 100W TEMPERATURE, pin solder, 10s 300 C TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vs V COMMON MODE REJECTION, DC 92 db NOISE, referred to input 100kHz bandwidth, 1kΩ R S 1 mvrms GAIN OPEN LOOP R L = 100Ω, C C =100pF 100 db GAIN BANDWIDTH 1MHz 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 15A, I O = +Vs 1 V VOLTAGE SWING I O = 15A, I O = Vs+1.5 V CURRENT, continuous, DC ± Vs ±8V 15 A CURRENT, continuous, DC ± Vs=±5V 10 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω SHUTDOWN TRANSITION TIME, off ± output voltage to zero 1 μs TRANSITION TIME, on Zero to normal output 2 μs CURRENT internal currents dumped into load ± 6 ma POWER SUPPLY VOLTAGE ±5 ± 35 ± 50 V CURRENT, quiescent ma +VB OUT, -VB OUT, load Output voltage for accessory modules ± 1.5 ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz 1.1 O C/W RESISTANCE, DC, junction to air Full temperature range 1.5 O C/W TEMPERATURE RANGE, ambient air O C TEMPERATURE, shutdown, substrate 110 O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C or more the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increase fan life. PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 3

79 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A OPERATING CONSIDERATIONS COMMON MODE RANGE The PAD117A is a rail to rail operational amplifier. This means that it works equally well with the input pins biased to either supply rail or at any voltage in between. The most common application utilizing this function is the single supply voltage amplifier where the +IN pin and the Vs supply pin are grounded. OUTPUT SWING With no load the output voltage of the PAD117A can swing to either supply voltage rail. As the load current increases the maximum output swing is reduced, but at 15A output the swing from the positive supply rail is less than 1V and less than 1.5V from the negative supply rail. This does not include any voltage drop due to the sensing voltage required for the current limit circuit to operate. CURRENT LIMIT The current limiting function of the PAD117A is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.65V. Thus: IL 0.65V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. In some applications better current limiting protection and a lower sense voltage may be desired. In this case the PAD117A can be operated with the PAD125 current limit accessory module. See Figure 3 in the applications section and the PAD125 data sheet for more details. COOLING FAN The PAD117A relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Since the male threaded ends RS of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 6, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 4. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 8 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 8 is low. When pin 8 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 8 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. PHASE COMPENSATION The PAD117A must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, a table gives recommended compensation capacitance values for various gains and the resulting slew rate for each capacitor value. PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 4

80 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =175 O C, -OUTPUT T J =175 O C, +OUTPUT T J =25 O C, -OUTPUT T J =25 O C, +OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 4Ω LOAD ±Vs = ±40V HARMONIC DISTORTION k k 30k FREQUENCY, F(Hz) 1W 10W 100W PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 5

81 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A PERFORMANCE GRAPHS CONTINUED 120 SMALL SIGNAL RESPONSE -80 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=100pF k k k 1M 2M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF k k k 300k FREQUENCY, F(Hz) 1kHz sine clipped by standard current limit into 4Ω load CC =220pF CC =100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz into 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 6

82 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 0.5µS after the shutdown signal goes low. The ringing in the output signal is due to inductance in the output line. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2µS after the shutdown signal goes low. The ringing in the output signal is due to inductance in the output line. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 7

83 RAIL TO RAIL OPERATIONAL AMPLIFIER 30 SAFE OPERATING AREA PAD117A SAFE OPERATING AREA 10μS OUTPUT CURRENT, Io (A) SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA 100μS The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD117A will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10mS DC, 30 O C AMBIENT PULSE 3% DUTY CYCLE 1S 10S 50S 1mS ] ]] ] 100mS PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 8

84 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 9

85 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A APPLICATION CIRCUITS R F IN 0 R 0 IN 5V 5.1k SD 8 21 IC 23 +IL 22 -IL OUT FIGURE 1. 4-WIRE CURRENT LIMIT 2N2222 TRANSISTOR CIRCUIT 5V 5V SD 8 R P R HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR S R L PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 10

86 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A APPLICATION CIRCUITS -IN +IN -Vcc AC +VB +VccCc2 Cc1 TMP GND SD OUT1 +Vs SUB OUT NC RESET PAD117 VIEW FROM COMPONENT SIDE NC 26 OUT -VB OUT 25 SD NC 24 STATUS +IL 23 GND -IL 22 -Vs IC 21 NC OUT2 -Vs IL IL IC +Vs PAD125 VIEW FROM COMPONENT SIDE FIGURE 3 USING THE PAD117A WITH THE PAD125 10k 2200pF TMP GND SD +5V OUT 15 R S TMP MONITOR MONITOR 2200pF FIGURE 4 MONITORING TMP AND SD OUTPUTS TO FEEDBACK & LOAD PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 11

87 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD117A APPLICATION CIRCUITS FIGURE 5 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT With the three current limit function pins (pins 21-23) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and R S can be calculated using the PAD Power spreadsheet that can be downloaded from the Power Amp Design web site under the Design Spreadsheet tab. PowerAmp Design PAD117A RAIL TO RAIL OPERATIONAL AMPLIFIER 12

88 PowerAmp Design HIGH POWER OPERATIONAL AMPLIFIER KEY FEATURES LOW COST HIGH VOLTAGE 100 VOLTS HIGH OUTPUT CURRENT UP TO 40A 165 WATT DISSIPATION CAPABILITY 400 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE ± 10V ± 50V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS DESCRIPTION The PAD118 high power operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 5.6 in 2 the PAD118 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD118 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD118 MOUNTED IN EVALUATION KIT PAD118 Rev I A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

89 HIGH POWER OPERATIONAL AMPLIFIER PAD118 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT AMPLIFIER PINOUT & CONNECTIONS Cc BALSUB+Vcc Cc1 Cc2 NC OUT1 +Vs VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC -Vs OUT PHASE COMPENSATION GAIN Cc SLEW V/uS 1 >10 470pF 100pF 3 8 C4 + C C2 + C1 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. TO FEEDBACK & LOAD PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 2

90 PAD118 HIGH POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 7 100V INPUT VOLTAGE +Vcc to Vcc 7 SUPPLY VOLTAGE +Vcc to Vcc 120V 7 DIFFERENTIAL INPUT VOLTAGE ± 20V OUTPUT CURRENT, peak 40A, within SOA TEMPERATURE, pin solder, 10s 300 C POWER DISSIPATION, internal, DC 165W TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vcc m 10 V COMMON MODE REJECTION, DC 92 db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 100Ω, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 20A +Vs 6.1 V VOLTAGE SWING I O = 20A Vs+6.1 V CURRENT, continuous, DC 20 A CURRENT, peak within SOA 40 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω POWER SUPPLY VOLTAGE 7 ± 10 ± 35 ± 50 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz.46 O C/W RESISTANCE, DC, junction to air Full temperature range.76 O C/W TEMPERATURE RANGE, heat sink O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan storage characteristics. During operation, even though the case may be at 85 O C the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. MTBF (Mean Time Before Failure), on the other hand, refers to a 50% failure rate. The MTBF of fans used by Power Amp Design is 210 khrs at 50C. 7. +Vcc and Vcc must not be more than 20V greater than +Vs and Vs respectively PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 3

91 HIGH POWER OPERATIONAL AMPLIFIER PAD118 OPERATING CONSIDERATIONS COOLING FAN The PAD118 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corner of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. PHASE COMPENSATION The PAD118 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. A compensation capacitor less than 100pF is not recommended. TEMPERATURE REPORTING An analog output voltage is provided (pin 24, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 26 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 26 is low. When pin 26 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 26 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. CURRENT LIMIT The PAD118 does not have a current limiting circuit built in. However, a Current Limit Accessory Module, model PAD125, is available if the current limiting function is needed for the application. See the PAD125 data sheet and Application Circuits for a typical connection diagram. PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 4

92 HIGH POWER OPERATIONAL AMPLIFIER PAD118 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =25 O C, +OUTPUT T J =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 4Ω LOAD ±Vs = ±45V HARMONIC DISTORTION k k 30k FREQUENCY, F(Hz) 15W 150W PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 5

93 HIGH POWER OPERATIONAL AMPLIFIER PAD118 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE Cc=470pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=470pF Cc=100pF k k k 1M 2M FREQUENCY, F(Hz) POWER RESPONSE k k k 300k FREQUENCY, F(Hz) 80V p-p 20kHz into 4Ω load, G=-10, Cc=100pF CC =470pF CC =100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz into 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 6

94 HIGH POWER OPERATIONAL AMPLIFIER PAD118 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2.5µS after the shutdown signal goes low. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 1.5µS after the shutdown signal goes low. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 7

95 HIGH POWER OPERATIONAL AMPLIFIER 40 SAFE OPERATING AREA PAD118 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) 10 DC, 30 O C AMBIENT PULSE 3% DUTY CYCLE SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA 100mS 10mS The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD115 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1S 10S 50S ] ] ] 1mS PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 8

96 HIGH POWER OPERATIONAL AMPLIFIER PAD118 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 9

97 HIGH POWER OPERATIONAL AMPLIFIER PAD118 APPLICATION CIRCUITS SD IN IN 29 5V 5.1k 5V 2N2222 TRANSISTOR CIRCUIT 5V SD 26 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 1. EXTERNAL SHUTDOWN WITH MONITOR BAL SUB+Vcc Cc1 Cc2 NC -Vcc 28 NC RESET PAD118 VIEW FROM COMPONENT SIDE SD 26 OUT GND 25 SD TMP 24 STATUS NC GND OUT1 +Vs -Vs -Vs OUT NC +IL IL IC +Vs PAD125 VIEW FROM COMPONENT SIDE R S TO FEEDBACK & LOAD FIGURE 2. TYPICAL PAD118 CONNECTIONS TO PAD125 ACCESSORY MODULE NC PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 10

98 HIGH POWER OPERATIONAL AMPLIFIER PAD118 APPLICATION CIRCUITS 10k 2200pF TMP GND SD TMP MONITOR MONITOR 2200pF FIGURE 3. MONITORING TMP AND SD OUTPUTS PowerAmp Design PAD118 HIGH POWER OPERATIONAL AMPLIFIER 11

99 PowerAmp Design HIGH POWER OPERATIONAL AMPLIFIER KEY FEATURES LOW COST HIGH VOLTAGE 200 VOLTS HIGH OUTPUT CURRENT UP TO 30A 165 WATT DISSIPATION CAPABILITY 400 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE ± 10V ± 100V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS DESCRIPTION The PAD119 high power operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 5.6 in 2 the PAD119 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD119 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. The resulting module is a small, high performance turn-key solution for many industrial applications. The PAD119-1 model is available without the heat sink and fan assembly for custom heat sink applications. PAD119 MOUNTED IN EVALUATION KIT PAD119 Rev D A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

100 HIGH POWER OPERATIONAL AMPLIFIER PAD119 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT AMPLIFIER PINOUT & CONNECTIONS Cc BALSUB+Vcc Cc1 Cc2 NC OUT1 +Vs VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC -Vs OUT PHASE COMPENSATION GAIN Cc SLEW V/uS 1 >10 470pF 100pF 3 8 C4 + C C2 + C1 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. TO FEEDBACK & LOAD PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 2

101 PAD119 HIGH POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 7 200V INPUT VOLTAGE +Vcc to Vcc 7 SUPPLY VOLTAGE +Vcc to Vcc 220V 7 DIFFERENTIAL INPUT VOLTAGE ± 20V OUTPUT CURRENT, peak 30A, within SOA TEMPERATURE, pin solder, 10s 300 C POWER DISSIPATION, internal, DC 165W TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vcc m 10 V COMMON MODE REJECTION, DC 92 db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 100Ω, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 20A +Vs 6.1 V VOLTAGE SWING I O = 20A Vs+6.1 V CURRENT, continuous, DC 20 A CURRENT, peak within SOA 30 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω POWER SUPPLY VOLTAGE 7 ± 15 ± 75 ± 100 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz.46 O C/W RESISTANCE, DC, junction to air Full temperature range.76 O C/W TEMPERATURE RANGE, heat sink O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan storage characteristics. During operation, even though the case may be at 85 O C the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. MTBF (Mean Time Before Failure), on the other hand, refers to a 50% failure rate. The MTBF of fans used by Power Amp Design is 210 khrs at 50C. 7. +Vcc and Vcc must not be more than 20V greater than +Vs and Vs respectively PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 3

102 HIGH POWER OPERATIONAL AMPLIFIER PAD119 OPERATING CONSIDERATIONS COOLING FAN The PAD119 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE PAD119 AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corner of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. MOUNTING THE PAD119-1 AMPLIFIER Model PAD119-1 is supplied without the heat sink and fan assembly for custom applications. See PAD119-1 Dimensional Information for details. Spread a thin and even coat of heat sink grease across the back of the PAD119-1 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 X ¼ male/female hex spacers. Torque the hardware to 4.7 pound inch [0.53 N m] max. Do not rely on the hardware pressure to squeeze out any excess heat sink grease as this will likely only bend the substrate at the corners. The ¼ hex spacers provide adequate spacing between the mother board and the components of the PAD119-1 and also provides some strain relief for the pins. It is recommended that the sockets similar to the PAD model CJS01 be used to mount the amplifier. The sockets provide additional strain relief on the pins and make it possible to remove the amplifier from the mother board. Without the sockets it may be next to impossible to remove the amplifier without damaging the mother board. PHASE COMPENSATION The PAD119 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (200V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. A compensation capacitor less than 100pF is not recommended. TEMPERATURE REPORTING An analog output voltage is provided (pin 24, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 26 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 26 is low. When pin 26 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 26 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. CURRENT LIMIT The PAD119 does not have a current limiting circuit built in. However, a Current Limit Accessory Module, model PAD125, is available if the current limiting function is needed for the application. See the PAD125 data sheet and Application Circuits for a typical connection diagram. PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 4

103 HIGH POWER OPERATIONAL AMPLIFIER PAD119 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) 0 OFFSET VOLTAGE DRIFT CASE TEMP, O C OUTPUT SWING FROM SUPPLY RAILS T J =25 O C, +OUTPUT T J =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) DISTORTION, % NORMALIZED QUIESCENT CURRENT, IQ(%) QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C HARMONIC DISTORTION Av = -10 Cc = 100pF 8Ω LOAD ±Vs = ±60V 15W 150W k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 5

104 HIGH POWER OPERATIONAL AMPLIFIER PAD119 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE Cc=470pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=470pF Cc=100pF k k k 1M 2M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF CC=100pF PHASE, Θ( O ) Cc=100pF k k M 2M FREQUENCY, F(Hz) k k k 200k FREQUENCY, F(Hz) SUBSTRATE TEMPERATURE, O C 80V p-p 20kHz into 4Ω load, G=-10, Cc=100pF TEMP OUTPUT, VOLTS (V) TEMPERATURE OUTPUT 100Vp-p 10kHz Pulse into 8Ω load, G=-10, Cc=100pF PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 6

105 HIGH POWER OPERATIONAL AMPLIFIER PAD119 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2.5µS after the shutdown signal goes low. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 1.5µS after the shutdown signal goes low. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 7

106 HIGH POWER OPERATIONAL AMPLIFIER 40 SAFE OPERATING AREA PAD119 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) 10 DC, 30 O C AMBIENT 1S 10S 50S PULSE 3% DUTY CYCLE ] ] ] SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA 100mS 10mS The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD119 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1mS PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 8

107 HIGH POWER OPERATIONAL AMPLIFIER PAD119 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 9

108 HIGH POWER OPERATIONAL AMPLIFIER PAD119-1 DIMENSIONAL INFORMATION PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 10

109 HIGH POWER OPERATIONAL AMPLIFIER PAD119 APPLICATION CIRCUITS -IN IN 29 5V 5.1k 5V SD 26 2N2222 TRANSISTOR CIRCUIT 5V SD 26 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 1. EXTERNAL SHUTDOWN WITH MONITOR BAL SUB+Vcc Cc1 Cc2 NC -Vcc 28 NC RESET PAD119 VIEW FROM COMPONENT SIDE SD 26 OUT GND 25 SD TMP 24 STATUS NC GND OUT1 +Vs -Vs -Vs OUT NC +IL IL IC +Vs PAD125 VIEW FROM COMPONENT SIDE R S TO FEEDBACK & LOAD FIGURE 2. TYPICAL PAD119 CONNECTIONS TO PAD125 ACCESSORY MODULE NC PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 11

110 HIGH POWER OPERATIONAL AMPLIFIER PAD119 APPLICATION CIRCUITS 10k 2200pF TMP GND SD TMP MONITOR MONITOR 2200pF FIGURE 3. MONITORING TMP AND SD OUTPUTS PowerAmp Design PAD119 HIGH POWER OPERATIONAL AMPLIFIER 12

111 PowerAmp Design HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 Rev E KEY FEATURES LOW COST HIGH VOLTAGE 500 VOLTS HIGH OUTPUT CURRENT 10A 150 WATT DISSIPATION CAPABILITY 450 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE ± 20V ± 250V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS LINE VOLTAGE SIMULATION DESCRIPTION The PAD126 high voltage operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 80mm square the PAD126 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD126 also features a substrate temperature reporting output and overtemp shutdown and is also compatible with the PAD125 Current Limit Accessory Module. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integrated heat sink and fan assembly. No BeO is used the amplifier. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD126 MOUNTED IN EVALUATION KIT WITH OPTIONAL ACCESSORY MODULES PAD125 & PAD131 A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetrically efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

112 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN 46 +IN 45 1 SUB NC 44 C1 + C3 Cc PAD126 VIEW FROM COMPONENT SIDE AMPLIFIER PINOUT & CONNECTIONS * NC +Vcc CC2 CC1 TEMP SD GND NC +Vcc NC NC NC -Vcc NC NC IL -IL IC NC NC NC PHASE COMPENSATION GAIN Cc SLEW V/uS 1 >15 470pF 33pF 5 50 NC -Vcc* NC Vs -Vs SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. NC OUT NC OUT2 * INTERNALLY CONNECTED + C4 C2 Rs TO FEEDBACK & LOAD PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 2

113 PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 500V INPUT VOLTAGE +Vcc to Vcc SUPPLY VOLTAGE +Vcc to Vcc 500V DIFFERENTIAL INPUT VOLTAGE ± 20V OUTPUT CURRENT, peak 12A, within SOA TEMPERATURE, pin solder, 10s 300 C POWER DISSIPATION, internal, DC 150W TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vcc m 15 V COMMON MODE REJECTION, DC 92 db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 100Ω, C C =47pF 108 db GAIN BANDWIDTH 1MHz C C =47pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 10A +Vs 14 V VOLTAGE SWING I O = 10A Vs+14 V CURRENT, continuous, DC 10 A CURRENT, peak within SOA 12 A SLEW RATE, A V = 100 C C = 10pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω POWER SUPPLY VOLTAGE 7 ± 20 ± 200 ± 250 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz.46 O C/W RESISTANCE, DC, junction to air Full temperature range 0.75 O C/W TEMPERATURE RANGE, heat sink O C FAN, 80mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 40 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan storage characteristics. During operation, even though the case may be at 85 O C the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. MTBF (Mean Time Before Failure), on the other hand, refers to a 50% failure rate. The MTBF of fans used by Power Amp Design is 210 khrs at 50C. PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 3

114 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD126 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. See application note AN-16 for PCB layout guidelines. EXTERNAL CIRCUIT COMPONENTS The output of the PAD126 can swing up to +/- 240V and this may stress or destroy external components that are often not seriously considered when developing circuits with small signal op amps. High voltage rated resistors may be purchased for the feedback circuit or, alternately, several ordinary resistors may be placed in series to obtain the proper voltage rating. The compensation capacitor C C is a NPO type and is rated for 500V. See AN-16 for PCB layout guidelines. COOLING FAN The PAD126 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. CURRENT LIMIT The current limiting function of the PAD126 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.65V. Thus approximately: IL 0.65V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function (Figures 1 and 5). MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by RS providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 6, TMP) relative to ground (pin 8, GND) and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. TMP is internally filtered, but when monitoring TMP the filter as shown in Figure 3 may be useful. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit turns off the amplifier when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the amplifier is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 7 ( SD ) goes low (ground) or is forced low the amplifier is turned off and remains off as long as pin 7 is low. When pin 7 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 7 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits (Figure 2) for details. To avoid loading the internal circuit any external circuit must be an open collector or open drain connection. PHASE COMPENSATION The PAD126 must be phase compensated. The compensation capacitor, C C, is connected between pins 4 and 5. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (500V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 10pF is not recommended. PAD125 ACCESSORY MODULE Precision current limiting can be achieved connecting the optional PAD125 Current Limit Accessory Module (See Figure 3) that provides a precision 150mV temperature compensated set point for the current limit as well as other programmable features. Please refer to the PAD125 datasheet for details on the operation of the module. PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 4

115 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =25 O C, +OUTPUT T J =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) DISTORTION, % NORMALIZED QUIESCENT CURRENT, IQ(%) QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C HARMONIC DISTORTION Av = -10 Cc = 100pF 8Ω LOAD ±Vs = ±60V 15W 150W k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 5

116 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE Cc=150pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) CURRENT LIMIT VALUE, I(A) Cc=150pF Cc=10pF Cc=33pF k k 100k 1M M FREQUENCY, F(Hz) k k k 300k FREQUENCY, F(Hz) POWER RESPONSE CC =150pF CC =33pF CC=10pF CURRENT LIMIT VS R S T C =-25 O C -I L T C =25 O C T C =-25 O C +I L T C =25 O C T C =85 O C T C =85 O C CURRENT LIMIT RESISTOR, R S (Ω) PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=33pF Cc=10pF k k M M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 1kHz sine clipped by current limit into 250Ω load PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 6

117 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows a view of a 5kHz, 1A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 50µS after the shutdown signal goes low. SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the left shows a view of a 5kHz, 1A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch1. The Ch2 display shows the output current going to zero about 150µS after the shutdown signal goes low. SHUTDOWN RECOVERY The oscilloscope display at the left shows a view of a 5kHz, 1A p-p amplifier output signal on Ch2 resuming normal operation after a shutdown signal on Ch1 go high (not shutdown). The output signal resumes normal operation after a delay of about 1mS. PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 7

118 HIGH VOLTAGE OPERATIONAL AMPLIFIER 20 SAFE OPERATING AREA PAD126 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) 10 1 DC, 30 O C AMBIENT 1S PULSE 3% DUTY CYCLE 10mS 100mS 10S 50S ] SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD126 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1mS ] ] 10μS 100μS PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 8

119 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 9

120 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 APPLICATION CIRCUITS IN R IN R F 38 IC 40 +IL 39 -IL *19-22, OUT* FIGURE 1. 4-WIRE CURRENT LIMIT CONNECTIONS 0 0 5V 5.1k SD 7 2N2222 TRANSISTOR CIRCUIT 5V 5V SD 7 R HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 2. EXTERNAL SHUTDOWN P R S R L PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 10

121 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 APPLICATION CIRCUITS -IN 46 +IN 45 1 SUB NC 44 2 NC 3 4 +Vcc CC2 Cc CC1 TEMP SD -Vcc NC NC +IL -IL IC GND NC NC PAD126 VIEW FROM COMPONENT SIDE NC 37 NC NC NC NC NC NC -Vcc NC RESET OUT SD STATUS GND -Vs NC +IL -IL IC +Vs +5V OUT Vs -Vs NC OUT FIGURE 3. TYPICAL CONNECTIONS PAD126 TO PAD125 NC OUT2 Rs TO FEEDBACK & LOAD PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 11

122 HIGH VOLTAGE OPERATIONAL AMPLIFIER PAD126 APPLICATION CIRCUITS +IL 40 -IL 39 IC 38 OUT OUT R1 R R3 S R2 R7 R4 R5 R6 D1 D2 FIGURE 5 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT With the three current limit function pins (pins 38-40) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and R S can be calculated using the PAD Power spreadsheet that can be downloaded from the Power Amp Design web site. PowerAmp Design PAD126 HIGH VOLTAGE OPERATIONAL AMPLIFIER 12

123 PowerAmp Design RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 Rev D KEY FEATURES LOW COST RAIL TO RAIL INPUT & OUTPUT WIDE SUPPLY RANGE ± 5V ± 50V SINGLE SUPPLY OPERATION HIGH OUTPUT CURRENT 30A 450 WATT OUTPUT CAPABILITY 225 WATT DISSIPATION CAPABILITY INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMP SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION PROGRAMMABLE POWER SUPPLY DESCRIPTION The PAD127 rail to rail operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications where it is important to obtain a maximum output signal with limited supply voltages. The PAD127 outperforms much more expensive hybrid component amplifiers or rack-mount amplifiers in a footprint only 80mm square. User selectable external compensation tailors the amplifier s response to the application requirements. Four-wire programmable current limit is built-in, but the PAD127 is compatible with the external PAD121 current limit accessory module as well. The PAD127 also features a substrate temperature reporting analog output and over-temp shutdown. The amplifier circuitry is built on an insulated metal substrate mounted to an integral heat sink and fan assembly. No BeO is used in the PAD127. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD127 mounted in evaluation kit A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER

124 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT C3 + C1 Cc AC +VB +Vcc Cc2 Cc1 TMPGND SD SUBOUT -VB -IN +IN -Vcc NC NC OUT NC +IL -IL IC * * * PHASE COMPENSATION GAIN Cc 1 470pF >10 100pF AMPLIFIER PINOUT & CONNECTIONS SLEW RATE 1.6V/uS 8V/uS R D 6 R D 5 R D 4 *1 *1 * OUT1 +Vs NC VIEW FROM COMPONENT SIDE OUT2 +Vs NC OUT3 +Vs -Vs OUT6 NC -Vs OUT5 NC -Vs OUT R D 1 R D 2 R D 3 *1 *1 *1 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. *1 SEE PAGE 5 FOR INFORMATION ON SELECTING VALUES FOR DEGENERATION RESISTORS -Vs C4 C2 + +Vs R S TO FEEDBACK & LOAD PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 2

125 PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 7 100V INPUT VOLTAGE +Vs to Vs 7 OUTPUT CURRENT, peak 40A, within SOA DIFFERENTIAL INPUT VOLTAGE ± 20V POWER DISSIPATION, internal, DC 225W TEMPERATURE, pin solder, 10s 300 C TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vs V COMMON MODE REJECTION, DC 92 db NOISE, referred to input 100kHz bandwidth, 1kΩ R S 1 mvrms GAIN OPEN LOOP R L = 100Ω, C C =100pF 100 db GAIN BANDWIDTH 1MHz 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 30A +Vs 1 V VOLTAGE SWING I O = 30A Vs+1.5 V CURRENT, continuous, DC 30 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω SHUTDOWN TRANSITION TIME, off ± output voltage to zero 1 μs TRANSITION TIME, on Zero to normal output 2 μs CURRENT internal currents dumped into load ± 6 ma POWER SUPPLY VOLTAGE 7 ± 5 ± 35 ± 50 V CURRENT, quiescent ma +VB OUT, -VB OUT, load Output voltage for accessory module ± 1.5 ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz.45 O C/W RESISTANCE, DC, junction to air Full temperature range.67 O C/W TEMPERATURE RANGE, ambient air O C TEMPERATURE, shutdown, substrate 110 O C FAN, 80mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 180 ma AIR FLOW 40 CFM RPM 3300 RPM NOISE 33 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C or more the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increase fan life. 7. +Vs, +Vcc must be connected together. Vs, Vcc must be connected together. PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 3

126 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 OPERATING CONSIDERATIONS COMMON MODE RANGE The PAD127 is a rail to rail operational amplifier. This means that it works equally well with the input pins biased to either supply rail or at any voltage in between. The most common application utilizing this function is the single supply voltage amplifier where the +IN pin and the Vs supply pin are grounded. OUTPUT SWING With no load the output voltage of the PAD127 can swing to either supply voltage rail. As the load current increases the maximum output swing is reduced, but at 10A output the swing from the positive supply rail is less than 1V and less than 1.5V from the negative supply rail. This does not include any voltage drop due to the sensing voltage required for the current limit circuit to operate or voltage drop across the degeneration resistors (see page 5). CURRENT LIMIT The current limiting function of the PAD127 is a versatile circuit that can be used to implement a four-wire current limit configuration or, in combination with some external components can be configured to implement a fold-over current limit circuit. The four-wire current limit configuration insures that parasitic resistance in the output line, Rp, does not affect the programmed current limit setting. See Figure 1. The sense voltage for current limit is 0.65V. Thus: IL 0.65V = Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C. The fold-over function reduces the available current as the voltage across the output transistors increases to help insure that the SOA of the output transistors is not exceeded. Refer to Application Circuits for details on how to connect the current limit circuitry to implement either a four-wire current limit or current limit with a fold-over function. In some applications better current limiting protection and a lower sense voltage may be desired. In this case the PAD127 can be operated with the PAD125 Current Limit Accessory Module. See Figure 3 in the applications section and the PAD125 data sheet for more details. COOLING FAN The PAD127 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the RS heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 6, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 4. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 8 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 8 is low. When pin 8 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 8 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 4

127 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 OPERATING CONSIDERATIONS CONTINUED PHASE COMPENSATION The PAD127 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 7, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, a table gives recommended compensation capacitance values for various gains and the resulting slew rate for each capacitor value. DEGENERATION RESISTORS The PAD127 derives its high power dissipation rating from the use of parallel output MOSFET transistors. To insure that the load current is distributed equally between the output transistors six external source degeneration resistors are needed. See R D 1-R D 6 in the external connections diagram on page 2. The value of the resistors changes depending on the total supply voltage needed for the application. The SOA power dissipation of the amplifier (225 watts dc) determines the maximum load current that the amplifier can supply with the needed total supply voltage. To insure that the amplifier is not damaged the correct value of degeneration resistors is critical. Do not operate the amplifier without the proper value of degeneration resistors. All of the six degeneration resistors will be the same value and can be calculated by: R D 0.75V T = Ω 225 Where R D is the value of each degeneration resistor and V T is the total power supply voltage from +Vs to Vs. The following table shows calculated degeneration resistor values (R D ) for various total supply voltages (V T ). Column (O) shows standard values that can be used from the Vishay/Dale resistor lines RS02B and LVR. These are also the resistor values supplied in the EVAL127 evaluation kit for the PAD127. V T R D O Watt Resistors are to be 3 or 5 watt as shown in the table, 1% tolerance and preferably non-inductive as inductive resistors may cause the output stage to oscillate. The resistors available from Power Amp Design are of the inductive wire-wound type but have been found to be adequate for this application. These resistors are also available with noninductive windings but are not usually stocked by distributors. The use of thick film chip resistors is not recommended. Thick film or metal film or powdered metal resistors types are suitable but may be either expensive or unavailable in the required values. PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 5

128 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =175 O C, -OUTPUT T J =175 O C, +OUTPUT T J =25 O C, -OUTPUT T J =25 O C, +OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 4Ω LOAD ±Vs = ±40V HARMONIC DISTORTION k k 30k FREQUENCY, F(Hz) 1W 10W 100W PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 6

129 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 PERFORMANCE GRAPHS CONTINUED 120 SMALL SIGNAL RESPONSE -80 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=100pF k k k 1M 2M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF k k k 300k FREQUENCY, F(Hz) 1kHz sine clipped by standard current limit into 4Ω load CC =220pF CC =100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz into 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 7

130 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 0.5µS after the shutdown signal goes low. The ringing in the output signal is due to inductance in the output line. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2µS after the shutdown signal goes low. The ringing in the output signal is due to inductance in the output line. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 8

131 RAIL TO RAIL OPERATIONAL AMPLIFIER 40 SAFE OPERATING AREA PAD127 SAFE OPERATING AREA 100μS OUTPUT CURRENT, Io (A) 10 PULSE 3% DUTY CYCLE 10mS DC, 30 O C AMBIENT SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA 1S 10S 50S The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD127 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 1mS ] ]] ] 100mS PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 9

132 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 10

133 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 APPLICATION CIRCUITS R F IN R 0 0 IN 5V 5.1k SD 8 37 IC 39 +IL 38 -IL OUT* *9,10,14,15,19,20,23,24,28,29,33,34 FIGURE 1. 4-WIRE CURRENT LIMIT 2N2222 TRANSISTOR CIRCUIT 5V 5V SD 8 R P R HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 2. EXTERNAL SHUTDOWN WITH MONITOR S R L PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 11

134 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 APPLICATION CIRCUITS -IN 46 +IN AC +VB +VccCc2 Cc1 TMP GND SD OUT1 +Vs OUT2 +Vs OUT3 +Vs SUB OUT -Vcc 44 NC RESET NC 42 OUT -VB OUT 41 SD NC 40 STATUS +IL 39 GND PAD127 VIEW FROM COMPONENT SIDE -IL IC -Vs OUT Vs NC +IL IL IC +Vs PAD125 VIEW FROM COMPONENT SIDE +5V OUT -Vs OUT5 -Vs OUT FIGURE 3 USING THE PAD127 WITH THE PAD125 10k 2200pF TMP GND SD TMP MONITOR MONITOR 2200pF FIGURE 4 MONITORING TMP AND SD OUTPUTS R S TO FEEDBACK & LOAD PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 12

135 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD127 APPLICATION CIRCUITS FIGURE 5 DUAL SLOPE (FOLD-OVER) CURRENT LIMIT With the three current limit function pins (pins 37-39) dual slope current limiting can be implemented that more closely approximates the SOA curve of the amplifier than can be achieved with standard current limiting techniques. Values for resistors R1-R7 and R S can be calculated using the PAD Power spreadsheet that can be downloaded from the Power Amp Design web site. PowerAmp Design PAD127 RAIL TO RAIL OPERATIONAL AMPLIFIER 13

136 PowerAmp Design HIGH POWER OPERATIONAL AMPLIFIER PAD128 Rev D KEY FEATURES LOW COST HIGH VOLTAGE 100 VOLTS HIGH OUTPUT CURRENT UP TO 30A 140 WATT DISSIPATION CAPABILITY 300 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE ± 10V ± 50V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN RAIL TO RAIL CAPABLE WITH PAD130 ACCESSORY MODULE APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL (PA) AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS DESCRIPTION The PAD128 high power operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 5.6 in 2 the PAD128 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD128 also features a substrate temperature reporting output and overtemp shutdown. The amplifier achieves rail to rail operation with the addition of the optional PAD130 Power Supply Accessory Module. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the amplifier. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD128 MOUNTED IN EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

137 HIGH POWER OPERATIONAL AMPLIFIER PAD128 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT AMPLIFIER PINOUT & CONNECTIONS Cc BALSUB+VccCc1 Cc2 NC OUT1 +Vs VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs PHASE COMPENSATION GAIN Cc SLEW V/uS 1 >10 470pF 100pF C C4 C2 + C1 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. TO FEEDBACK & LOAD PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 2

138 PAD128 HIGH POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 100V INPUT VOLTAGE +Vcc to Vcc SUPPLY VOLTAGE +Vcc to Vcc 120V 7 DIFFERENTIAL INPUT VOLTAGE ± 20V OUTPUT CURRENT, peak 30A, within SOA TEMPERATURE, pin solder, 10s 300 C POWER DISSIPATION, internal, DC 140W TEMPERATURE, junction C OPERATING TEMPERATURE, heat sink 40 to +105 C TEMPERATURE RANGE, storage 40 to 70 C 5 PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vcc-10 V COMMON MODE VOLTAGE RANGE -Vcc+6 V COMMON MODE REJECTION, DC 92 db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 100Ω, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 20A +Vs 6.1 V VOLTAGE SWING I O = 20A Vs+6.1 V CURRENT, continuous, DC 20 A CURRENT, peak within SOA 30 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC, open loop 4 Ω POWER SUPPLY VOLTAGE 7 ± 10 ± 35 ± 50 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz 0.7 O C/W RESISTANCE, DC, junction to air Full temperature range 0.9 O C/W TEMPERATURE RANGE, heat sink O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan storage characteristics. During operation, even though the case may be at 85 O C the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. 7. +Vcc and Vcc must not be more than 20V greater than +Vs and Vs respectively PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 3

139 HIGH POWER OPERATIONAL AMPLIFIER PAD128 OPERATING CONSIDERATIONS COOLING FAN The PAD128 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corner of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 24, TMP) relative to ground (pin 25) and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 26 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 26 is low. When pin 26 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 26 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. CURRENT LIMIT The PAD128 does not have a current limiting circuit built in. However, a Current Limit Accessory Module, model PAD125, is available if the current limiting function is needed for the application. See the PAD125 data sheet and Application Circuits for a typical connection diagram. RAIL TO RAIL OPERATION Rail to rail input and output operation is implemented by adding two additional external power supplies to the amplifier circuit. One power supply is set to be +Vs+10V and is connected to the +Vcc pin. The other additional power supply is set to be Vs-10V and is connected to the Vcc pin. See Figure 3 in Application Circuits. An accessory module, model PAD130, provides a convenient compact power supply for this purpose. See the data sheet for the PAD130. See also application note AN10, The Rail to Rail Advantage. PHASE COMPENSATION The PAD128 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, a table gives recommended compensation capacitance values for various gains and the resulting slew rate for each capacitor value. PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 4

140 HIGH POWER OPERATIONAL AMPLIFIER PAD128 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =25 O C, -OUTPUT T J =25 O C, +OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 4Ω LOAD ±Vs = ±45V HARMONIC DISTORTION k k 30k FREQUENCY, F(Hz) 15W 150W PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 5

141 HIGH POWER OPERATIONAL AMPLIFIER PAD128 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=470pF Cc=100pF k k k 1M 3M FREQUENCY, F(Hz) POWER RESPONSE k k k 600k FREQUENCY, F(Hz) 80Vp-p 20kHz into 4Ω load, G=-10, Cc=100pF CC =470pF CC =100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=470pF Cc=100pF k k M 3M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz square response, 80Vp-p, 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 6

142 HIGH POWER OPERATIONAL AMPLIFIER PAD128 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2.5µS after the shutdown signal goes low. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 1.5µS after the shutdown signal goes low. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 7

143 HIGH POWER OPERATIONAL AMPLIFIER PAD128 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RECOVERY, ZERO TO NEGATIVE TRANSITION SHUTDOWN RECOVERY, ZERO TO POSITIVE TRANSITION The oscilloscope display at the right shows an expanded view of the PAD128 recovering from a shutdown condition and resuming the portion of a 1kHz 5Ap-p amplifier output signal on Ch1. The Ch2 display shows shutdown signal going high (no shutdown). The amplifier recovers from the shutdown condition in about 30µS. The oscilloscope display at the left shows an expanded view of the PAD128 recovering from a shutdown condition and resuming the negative portion of a 1kHz 5Ap-p amplifier output signal on Ch1. The Ch2 display shows shutdown signal going high (no shutdown). The amplifier recovers from the shutdown condition in about 10µS. PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 8

144 HIGH POWER OPERATIONAL AMPLIFIER 40 SAFE OPERATING AREA PAD128 SAFE OPERATING AREA 100μS OUTPUT CURRENT, Io (A) 10 PULSE 3% DUTY CYCLE DC, 30 O C AMBIENT SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD128 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10mS 100mS 1S 10S 50S 1mS ] ] ] ] PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 9

145 HIGH POWER OPERATIONAL AMPLIFIER PAD128 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 10

146 HIGH POWER OPERATIONAL AMPLIFIER PAD128 APPLICATION CIRCUITS SD V 5.1k 5V 2N2222 TRANSISTOR CIRCUIT 5V SD 26 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 1. EXTERNAL SHUTDOWN WITH MONITOR Cc BALSUB+Vcc Cc1 Cc2 NC OUT1 +Vs PAD128 VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs RESET OUT SD STATUS GND -Vs NC +IL PAD125 VIEW FROM COMPONENT SIDE C IL IC +Vs C4 + C2 C1 TO FEEDBACK & LOAD FIGURE 2. TYPICAL PAD128 CONNECTIONS TO PAD125 ACCESSORY MODULE NC R S PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 11

147 HIGH POWER OPERATIONAL AMPLIFIER PAD128 APPLICATION CIRCUITS BALSUB+Vcc Cc1 Cc2 NC OUT1 +Vs PAD128 VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs Vs -Vcc OUT AC SUB NC +Vs +Vcc OUT PAD130 VIEW FROM COMPONENT SIDE FIGURE 3. IMPLEMENTING RAIL TO RAIL OPERATION USING PAD130 ACCESSORY MODULE C4 + C4 C2 + C1 PowerAmp Design PAD128 HIGH POWER OPERATIONAL AMPLIFIER 12

148 PowerAmp Design HIGH POWER OPERATIONAL AMPLIFIER PAD129 Rev E KEY FEATURES LOW COST POWER BANDWIDTH - 57kHz, 180Vp-p HIGH VOLTAGE 200 VOLTS HIGH OUTPUT CURRENT UP TO 20A 140 WATT DISSIPATION CAPABILITY 300 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE ± 10V ± 100V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN APPLICATIONS PIEZO DRIVE LINEAR MOTOR DRIVE INDUSTRIAL (PA) AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS DESCRIPTION The PAD129 high power operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 5.6 in 2 the PAD129 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD129 also features a substrate temperature reporting output and overtemp shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integral heat sink and fan assembly. No BeO is used in the amplifier. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD129 mounted in EVAL129 evaluation kit with accessory modules. A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

149 HIGH POWER OPERATIONAL AMPLIFIER PAD129 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT AMPLIFIER PINOUT & CONNECTIONS Cc BALSUB+Vcc Cc1 Cc2 NC OUT1 +Vs VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs PHASE COMPENSATION GAIN Cc SLEW V/uS 1 >10 470pF 100pF 8 32 C C4 C2 + C1 * SEE APPLICATION CIRCUITS FOR OTHER CONNECTIONS AND FUNCTIONS. TO FEEDBACK & LOAD PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 2

150 PAD129 HIGH POWER OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 200V INPUT VOLTAGE +Vcc to Vcc SUPPLY VOLTAGE +Vcc to Vcc 220V 7 DIFFERENTIAL INPUT VOLTAGE ± 20V OUTPUT CURRENT, peak 20A, within SOA TEMPERATURE, pin solder, 10s 300 C POWER DISSIPATION, internal, DC 140W TEMPERATURE, junction C OPERATING TEMPERATURE, heat sink 40 to +105 C TEMPERATURE RANGE, storage 40 to 70 C 5 PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vcc-10 V COMMON MODE VOLTAGE RANGE -Vcc+6 V COMMON MODE REJECTION, DC 92 db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 100Ω, C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 15A +Vs 6.1 V VOLTAGE SWING I O = 15A Vs+6.1 V CURRENT, continuous, DC 15 A CURRENT, peak within SOA 20 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 4 μs RESISTANCE No load, DC, open loop 5 Ω POWER SUPPLY VOLTAGE 7 ± 10 ± 75 ± 100 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz 0.7 O C/W RESISTANCE, DC, junction to air Full temperature range 0.9 O C/W TEMPERATURE RANGE, heat sink O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan storage characteristics. During operation, even though the case may be at 85 O C the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. 7. +Vcc and Vcc must not be more than 20V greater than +Vs and Vs respectively PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 3

151 HIGH POWER OPERATIONAL AMPLIFIER PAD129 OPERATING CONSIDERATIONS COOLING FAN The PAD129 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corner of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 24, TMP) relative to ground (pin 25) and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is susceptible to capacitive loading and pickup from the output of the amplifier. When monitoring TMP filter the voltage as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 26 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 26 is low. When pin 26 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 26 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. CURRENT LIMIT The PAD129 does not have a current limiting circuit built in. However, a Current Limit Accessory Module, model PAD125, is available if the current limiting function is needed for the application. See the PAD125 data sheet and Application Circuits for a typical connection diagram. RAIL TO RAIL OPERATION Rail to rail input and output operation is implemented by adding two additional external power supplies to the amplifier circuit. One power supply is set to be +Vs+10V and is connected to the +Vcc pin. The other additional power supply is set to be Vs-10V and is connected to the Vcc pin. See Figure 3 in Application Circuits. See also application note AN10, The Rail to Rail Advantage. The PAD132 Power Supply Accessory Module is designed to provide a low cost dual power supply for this function. See the full data sheet for the PAD132. PHASE COMPENSATION The PAD129 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (200V). On page 2, under Amplifier Pinout and Connections, a table gives recommended compensation capacitance values for various gains and the resulting slew rate for each capacitor value. PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 4

152 HIGH POWER OPERATIONAL AMPLIFIER PAD129 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =25 O C, -OUTPUT T J =25 O C, +OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 4Ω LOAD ±Vs = ±45V HARMONIC DISTORTION k k 30k FREQUENCY, F(Hz) 15W 150W PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 5

153 HIGH POWER OPERATIONAL AMPLIFIER PAD129 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=470pF Cc=100pF k k k 1M 3M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF k k k M FREQUENCY, F(Hz) 80Vp-p 20kHz into 4Ω load, G=-10, Cc=100pF CC =100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=470pF Cc=100pF k k M 3M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz square response, 80Vp-p, 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 6

154 HIGH POWER OPERATIONAL AMPLIFIER PAD129 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2.5µS after the shutdown signal goes low. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 1.5µS after the shutdown signal goes low. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 7

155 HIGH POWER OPERATIONAL AMPLIFIER PAD129 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RECOVERY, ZERO TO NEGATIVE TRANSITION SHUTDOWN RECOVERY, ZERO TO POSITIVE TRANSITION The oscilloscope display at the right shows an expanded view of the PAD129 recovering from a shutdown condition and resuming the portion of a 1kHz 5Ap-p amplifier output signal on Ch1. The Ch2 display shows shutdown signal going high (no shutdown). The amplifier recovers from the shutdown condition in about 30µS. The oscilloscope display at the left shows an expanded view of the PAD129 recovering from a shutdown condition and resuming the negative portion of a 1kHz 5Ap-p amplifier output signal on Ch1. The Ch2 display shows shutdown signal going high (no shutdown). The amplifier recovers from the shutdown condition in about 10µS. PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 8

156 HIGH POWER OPERATIONAL AMPLIFIER 30 SAFE OPERATING AREA PAD129 SAFE OPERATING AREA OUTPUT CURRENT, Io (A) 10 1 PULSE 3% DUTY CYCLE DC, 30 O C AMBIENT SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD129 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10mS 100mS 1S 10S 50S 1mS 100μS ] ] ] ] PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 9

157 HIGH POWER OPERATIONAL AMPLIFIER PAD129 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 10

158 HIGH POWER OPERATIONAL AMPLIFIER PAD129 APPLICATION CIRCUITS SD V 5.1k 5V 2N2222 TRANSISTOR CIRCUIT 5V SD 26 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 1. EXTERNAL SHUTDOWN WITH MONITOR Cc BALSUB+VccCc1 Cc2 NC OUT1 +Vs PAD129 VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs RESET OUT SD STATUS GND -Vs NC +IL PAD125 VIEW FROM COMPONENT SIDE C IL IC +Vs C4 C2 + C1 TO FEEDBACK & LOAD FIGURE 2. TYPICAL PAD129 CONNECTIONS TO PAD125 ACCESSORY MODULE NC R S PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 11

159 HIGH POWER OPERATIONAL AMPLIFIER PAD129 APPLICATION CIRCUITS BALSUB+Vcc Cc1 Cc2 NC OUT1 +Vs PAD129 VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs Vs -Vcc OUT AC SUB NC +Vs +Vcc OUT PAD132 VIEW FROM COMPONENT SIDE FIGURE 3. IMPLEMENTING RAIL TO RAIL OPERATION USING PAD130 ACCESSORY MODULE C4 + C4 C2 + C1 PowerAmp Design PAD129 HIGH POWER OPERATIONAL AMPLIFIER 12

160 PowerAmp Design COMPACT HIGH VOLTAGE OP AMP PAD135 Rev G KEY FEATURES LOW COST SMALL SIZE 40mm SQUARE HIGH VOLTAGE 200 VOLTS HIGH OUTPUT CURRENT 10A PEAK 40 WATT DISSIPATION CAPABILITY 200V/µS SLEW RATE APPLICATIONS INDUSTRIAL INK JET PRINT HEADS HIGH VOLTAGE INSTRUMENTATION PIEZO TRANSDUCER DRIVE DESCRIPTION The PAD135 compact high voltage op amp is constructed with surface mount components to provide a cost effective solution for many industrial applications such as an ink jet print head driver. With a footprint only 40mm square the PAD135 offers outstanding performance that rivals more expensive hybrid components. An integrated heat sink and fan cooling are included. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD135 is capable of driving 150V pulses into 47nF at 50 khz with a duty cycle of 40% and a slew rate of 200V/µS. The PAD135 is built on a thermally conductive but electrically insulating substrate. No BeO is used in the PAD135. For custom applications the PAD135-1 version of the amplifier is available without the integrated heat sink and fan PAD135 PAD135-1 PAD135 MOUNTED IN EVAL135 EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD135 COMPACT HIGH VOLATGE OP AMP

161 COMPACT HIGH VOLTAGE OP AMP PAD135 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN +IN PINOUT & CONNECTIONS Cc AC SUB Cc1 Cc2+Vcc +Vs OUT1 VIEW FROM COMPONENT SIDE OUT2 NC -Vcc NC NC -Vs Vs C3 + C4 PHASE COMPENSATION SLEW RATE GAIN Cc _ >20 10pF 200V/uS >10 _ 22pF 150V/uS >6 _ 47pF 80V/uS >1 _ 150pF 25V/uS + C2 C1 +Vs FEEDBACK & LOAD SEE APPLICATION NOTES FOR ALTERNATIVE CONNECTIONS PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 2

162 PAD135 COMPACT HIGH VOLTAGE OP AMP ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 4 200V TEMPERATURE, pin solder, 10s, 300 C SUPPLY VOLTAGE, +Vcc to Vcc 4 200V TEMPERATURE, junction C INPUT VOLTAGE +Vcc to Vcc TEMPERATURE RANGE, storage 40 to 70 C 5 DIFFERENTIAL INPUT VOLTAGE ± 20V TEMPERATURE RANGE, storage, PAD C OUTPUT CURRENT, peak, within SOA 10A OPERATING TEMPERATURE, substrate 40 to 85 C POWER DISSIPATION, internal, DC 40W PARAMETER TEST CONDITIONS 1 MIN TYP MAX PAD UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 3 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vs 15 V COMMON MODE VOLTAGE RANGE Vs+8 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP R L = 10kΩ, C C =10pF 108 db GAIN BANDWIDTH 1MHz C C =10pF 4 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 5A +Vs 8 +Vs 6.5 V VOLTAGE SWING I O = 5A Vs+8 Vs+6.5 V CURRENT, continuous, DC 5 A CURRENT, pulse, 10mS, within SOA 10 A SLEW RATE, A V = +65 C C = 10pF 200 V/μS SETTLING TIME, to 0.1% 2V Step, C C = 10pF 4 μs RESISTANCE No load, DC 8 Ω POWER SUPPLY VOLTAGE ± 15 ± 75 ± 100 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air or case 6 Full temperature range, f 60Hz 2.1 to air 1.7 to case O C/W RESISTANCE, DC junction to air or case Full temperature range 3.1 to air 2.5 to case O C/W TEMPERATURE RANGE, substrate O C TEMPERATURE RANGE, ambient NA O C FAN, 40mm dc brushless, ball bearing OPERATING VOLTAGE 12 NA V OPERATING CURRENT 50 NA ma AIR FLOW 7.5 NA CFM RPM 7000 NA RPM NOISE 30 NA db L10, life expectancy, 50 O C 8 45 NA khrs L10, life expectancy, 25 O C 8 60 NA khrs NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 150pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages to the output stage. +Vcc and Vcc denote the positive and negative supply voltages to the small signal stages. +Vcc and Vcc may not be more than + and 20V greater than +Vs and Vs respectively. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +Vcc and Vcc must not be less than +Vs and Vs respectively. Total voltage +Vcc to Vcc 200V maximum. 8. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life. 9. Specifications for the PAD135-1 are the same as for the PAD135 except as shown in this column. 3 PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP

163 COMPACT HIGH VOLTAGE OP AMP PAD135 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD135 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands-off method whereby test equipment probes are attached only when power is off. COOLING FAN The PAD135 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE PAD135 AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in oz [3.8 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. MOUNTING THE PAD135-1 AMPLIFIER In most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD135-1 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers and torque to 4.7 in oz [3.8 N cm] max. Mount the amplifier to the mother board with 4-40 X 1/4 screws. See Dimensional Information for additional recommendations. PHASE COMPENSATION The PAD135 must be phase compensated. The compensation capacitor, C C, is connected between pins 2 and 3. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (200V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 10pF is not recommended. SINGLE HIGH-CURRENT SUPPLY OPERATION It is often desirable to operate the PAD135 with a single high-current power supply as this reduces system cost. Figure 2 in the application circuits section shows one way to do this. However, in this case the input signal should be offset slightly to prevent the output from being driven to ground. When the output swings closer to ground than 10V the output transistor connected to the negative supply must recover from being over-driven. This causes a delay in the output going to a high condition. If the input signal is offset slightly so that the output is not driven to less than 10V this delay is avoided. The resulting output signal will then vary from 10V to 150V. For a circuit gain of +65 the required input signal then becomes 0.156V to 2.344V. For custom applications the PAD135 or PAD135-1 can be ordered with its offset voltage set to produce the same effect. This option is desirable in applications where adjusting the input signal is difficult. PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 4

164 COMPACT HIGH VOLTAGE OP AMP PAD135 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING PAD135 USE CASE TEMP FOR PAD135-1 USE AMBIENT TEMP FOR PAD135 PAD CASE OR AMBIENT AIR TEMPERATURE, T ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T C =25 O C, +OUTPUT T C =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) DISTORTION, % NORMALIZED QUIESCENT CURRENT, IQ(%) QUIESCENT CURRENT VS SUPPLY VOLTAGE Vs ONLY BOTH -Vs ONLY TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -20 Cc = 10pF 8Ω LOAD ±Vs = ±36V HARMONIC DISTORTION 4W OUT 40W OUT k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 5

165 COMPACT HIGH VOLTAGE OP AMP PAD135 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE Cc=150pF Cc=47pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=22pF ] Cc=150pF Cc=47pF Cc=10pF k k 100k 1M M FREQUENCY, F(Hz) POWER RESPONSE CC =150pF CC =47pF CC =22pF k k M FREQUENCY, F(Hz) CC=10pF 4M PHASE, Θ( O ) k M M FREQUENCY, F(Hz) Cc=22pF Cc=10pF PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 6

166 COMPACT HIGH VOLTAGE OP AMP PAD135 SAFE OPERATING AREA 10 SAFE OPERATING AREA 100μS 10μS OUTPUT CURRENT, Io (A) DC, 30 O C AMBIENT PULSE 3% DUTY CYCLE 100mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD135 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the website. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10mS 1S 10S 50S 1mS ] ] ] PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 7

167 COMPACT HIGH VOLTAGE OP AMP PAD135 DIMENSIONAL INFORMATION PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 8

168 COMPACT HIGH VOLTAGE OP AMP PAD135 DIMENSIONAL INFORMATION CONTINUED PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 9

169 COMPACT HIGH VOLTAGE OP AMP PAD135 APPLICATION CIRCUITS 65k INPUT SIGNAL 1k 100uF uF +165V 100uF 1uF + 4 +Vcc 6 +Vs PAD135 5,8 OUT Cc 3 -Vs -Vcc pF -15V PRINT HEAD FIGURE 1. TYPICAL DUAL SUPPLY PRINT HEAD DRIVE CIRCUIT 1.3k V/2.344V INPUT 13 SIGNAL 0.1uF +165V 100uF 1uF + 4 +Vcc 6 +Vs PAD135 5,8 OUT Cc -Vs 3 -Vcc pF -15V 82.5k +10V/150V PULSE PRINT HEAD FIGURE 2. SINGLE HIGH-CURRENT POWER SUPPLY PRINT HEAD DRIVE CIRCUIT PowerAmp Design PAD135 COMPACT HIGH VOLTAGE OP AMP 10

170 PowerAmp Design RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 Rev B KEY FEATURES LOW COST SINGLE SUPPLY OPERATION RAIL TO RAIL INPUT & OUTPUT HIGH VOLTAGE 100 VOLTS HIGH OUTPUT CURRENT 20A 140 WATT DISSIPATION CAPABILITY 300 WATT OUTPUT CAPABILITY WIDE SUPPLY RANGE 5V 50V INTEGRATED HEAT SINK AND FAN TEMPERATURE REPORTING OVER-TEMPERATURE SHUTDOWN APPLICATIONS LINEAR MOTOR DRIVE INDUSTRIAL (PA) AUDIO SEMICONDUCTOR TESTING VIBRATION CANCELLATION MAGNETIC BEARINGS DESCRIPTION The PAD137 high power operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. With a footprint only 5.6 in 2 the PAD137 offers outstanding performance that rivals much more expensive hybrid component amplifiers or rack-mount amplifiers. User selectable external compensation tailors the amplifier s response to the application requirements. The PAD137 also features a substrate temperature reporting output and overtemperature shutdown. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate mounted to an integrated heat sink and fan assembly. No BeO is used in the amplifier. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD137 MOUNTED IN EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan combination is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

171 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN +IN AMPLIFIER PINOUT & CONNECTIONS Cc SUB+Vcc Cc1 Cc2 NC OUT1 +Vs +VB OUT -VB OUT -Vcc +Vs+10V VIEW FROM COMPONENT SIDE SD GNDTMP NC Vs-10V OUT2 -Vs C C4 -Vs C2 +Vs + C1 TO FEEDBACK & LOAD PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 2

172 PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 7 100V INPUT VOLTAGE +Vs to Vs OUTPUT CURRENT, peak 30A, within SOA DIFFERENTIAL INPUT VOLTAGE ± 20V POWER DISSIPATION, internal, DC 140W TEMPERATURE, pin solder, 10s 300 C TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 70 C 5 OPERATING TEMPERATURE, heat sink 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 20 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE ± Vs V COMMON MODE REJECTION, DC 92 db NOISE, referred to input 100kHz bandwidth, 1kΩ R S 1 mvrms GAIN OPEN LOOP R L = 100Ω, C C =100pF 100 db GAIN BANDWIDTH 1MHz 1 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 20A, I O = +Vs 1 V VOLTAGE SWING I O = 20A, I O = Vs+1.5 V CURRENT, continuous, DC ± Vs ±8V 20 A CURRENT, continuous, DC ± Vs=±5V 15 A SLEW RATE, A V = 10 C C = 100pF V/μS SETTLING TIME, to 0.1% 2V Step 2 μs RESISTANCE No load, DC 3 Ω SHUTDOWN TRANSITION TIME, off ± output voltage to zero 1 μs TRANSITION TIME, on Zero to normal output 2 μs CURRENT internal currents dumped into load ± 6 ma POWER SUPPLY VOLTAGE ±5 ± 35 ± 50 V CURRENT, quiescent ma +VB OUT, -VB OUT, load Output voltage for accessory modules ± 1.5 ma THERMAL RESISTANCE, AC, junction to air 4 Full temperature range, f 60Hz.7 O C/W RESISTANCE, DC, junction to air Full temperature range.9 O C/W TEMPERATURE RANGE, ambient air O C TEMPERATURE, shutdown, substrate 110 O C FAN, 60mm dc brushless, ball bearing OPERATING VOLTAGE 12 V OPERATING CURRENT 150 ma AIR FLOW 25 CFM RPM 3800 RPM NOISE 30 db L10, life expectancy, 50 O C 6 45 khrs L10, life expectancy, 25 O C 6 60 khrs NOTES: 1. Unless otherwise noted: T C =25 O C, compensation Cc=470pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C or more the fan will be at a lower temperature. 6. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increase fan life. PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 3

173 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 OPERATING CONSIDERATIONS COMMON MODE RANGE The PAD137 is a rail to rail operational amplifier. This means that it works equally well with the input pins biased to either supply rail or at any voltage in between. The most common application utilizing this function is the single supply voltage amplifier where the +IN pin and the Vs supply pin are grounded. OUTPUT SWING With no load the output voltage of the PAD137 can swing to either supply voltage rail. As the load current increases the maximum output swing is reduced, but at 20A output the swing from the positive supply rail is less than 1V and less than 1.5V from the negative supply rail. This does not include any voltage drop due to the sensing voltage required for the current limit circuit to operate. COOLING FAN The PAD137 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. CURRENT LIMIT The PAD137 does not have a current limiting circuit built in. However, a Current Limit Accessory Module, model PAD125, is available if the current limiting function is needed for the application. See the PAD125 datasheet and Figure 2, Application Circuits for a typical connection diagram. MOUNTING THE AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Since the male threaded ends of the spacers extend beyond the amplifier pins the spacers provide a convenient alignment tool to guide the insertion of the amplifier pins into the circuit board. Once the amplifier is seated secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. TEMPERATURE REPORTING An analog output voltage is provided (pin 24, TMP) relative to ground and proportional to the temperature in degrees C. The slope is approximately mV/ o C. The output voltage follows the equation: T = (2.127 V) (92.42) Where V is the TMP output voltage and T is the substrate temperature in degrees C. This high impedance output circuit is may be susceptible to capacitive loading and pickup from the output of the amplifier. It is filtered internally but some application circuits may need additional external filtering as shown in Figure 3. See Applications Circuits. THERMAL SHUTDOWN The temperature monitoring circuit automatically turns off the output transistors when the substrate temperature reaches 110 o C. When the substrate cools down 10 o C the output is enabled once again. The thermal shutdown feature is activated either by amplifier overloads or a failure of the fan circuit. EXTERNAL SHUTDOWN When pin 26 ( SD ) is taken low (ground) the output stage is turned off and remains off as long as pin 26 is low. When pin 26 is monitored with a high impedance circuit it also functions as a flag, reporting when the amplifier is shut down. A high (+5V) on pin 26 indicates the temperature is in the normal range. A low (ground) indicates a shutdown condition. See Figure 1, Application Circuits for details on how to implement an external shutdown circuit and how to monitor the shutdown status. PHASE COMPENSATION The PAD137 must be phase compensated to operate correctly. The compensation capacitor, C C, is connected between pins 4 and 5. On page 6, Typical Performance Graphs, you will find plots for small signal response and phase response using compensation values of 100pF and 470pF. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, a table gives recommended compensation capacitance values for various gains and the resulting slew rate for each capacitor value. PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 4

174 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 TYPICAL PERFORMANCE GRAPHS INTERNAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING AMBIENT AIR TEMPERATURE, T A, ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T J =175 O C, -OUTPUT T J =175 O C, +OUTPUT T J =25 O C, -OUTPUT T J =25 O C, +OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 4Ω LOAD ±Vs = ±40V HARMONIC DISTORTION k k 30k FREQUENCY, F(Hz) 1W 10W 100W PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 5

175 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 PERFORMANCE GRAPHS CONTINUED 120 SMALL SIGNAL RESPONSE -80 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=100pF k k k 1M 2M FREQUENCY, F(Hz) POWER RESPONSE CC=470pF k k k 300k FREQUENCY, F(Hz) CC =220pF CC =100pF PHASE, Θ( O ) TEMP OUTPUT, VOLTS (V) Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C 20kHz into 4Ω load, G=-10, Cc=100pF PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 6

176 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 PERFORMANCE GRAPHS CONTINUED SHUTDOWN RESPONSE, NEGATIVE OUTPUT TO ZERO TRANSITION SHUTDOWN RESPONSE, POSITIVE OUTPUT TO ZERO TRANSITION The oscilloscope display at the right shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the positive peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 0.5µS after the shutdown signal goes low. The ringing in the output signal is due to inductance in the output line. Pulse Response, Positive to Negative, 4Ω Load G=-10, Cc=100pF The oscilloscope display at the left shows an expanded view of a 1kHz 1.2A p-p amplifier output signal being interrupted near the negative peak by a shutdown signal on Ch2. The Ch1 display shows the output current going to zero about 2µS after the shutdown signal goes low. The ringing in the output signal is due to inductance in the output line. Pulse Response, Negative to Positive, 4Ω Load G=-10, Cc=100pF PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 7

177 RAIL TO RAIL OPERATIONAL AMPLIFIER 40 SAFE OPERATING AREA PAD137 SAFE OPERATING AREA 100μS OUTPUT CURRENT, Io (A) 10 PULSE 3% DUTY CYCLE DC, 30 O C AMBIENT SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD137 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be found in the Power Amp Design website under the Design Spreadsheet tab. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10mS 100mS 1S 10S 50S 1mS ] ] ] ] PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 8

178 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 DIMENSIONAL INFORMATION Power Amp Design PADXXX PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 9

179 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 APPLICATION CIRCUITS SD IN +IN V 5.1k 5V 2N2222 TRANSISTOR CIRCUIT 5V SD 26 HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION HIGH IMPEDANCE MEASURING CIRCUIT SHUTDOWN MONITOR LOW=SHUTDOWN HIGH=NORMAL OPERATION OPEN COLLECTOR OR OPEN DRAIN LOGIC GATES CIRCUIT FIGURE 1. EXTERNAL SHUTDOWN WITH MONITOR Cc SUB+VccCc1 Cc2 NC OUT1 +Vs +VB OUT -VB OUT -Vcc PAD137 VIEW FROM COMPONENT SIDE SD GNDTMP NC OUT2 -Vs RESET OUT SD STATUS GND -Vs NC +IL PAD125 VIEW FROM COMPONENT SIDE C IL IC +Vs NC C4 + C2 C1 R S TO LOAD & FEEDBACK FIGURE 2. TYPICAL PAD137 CONNECTIONS TO PAD125 ACCESSORY MODULE -Vs +Vs PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 10

180 RAIL TO RAIL OPERATIONAL AMPLIFIER PAD137 APPLICATION CIRCUITS 10k TMP SD GND 2200pF TMP MONITOR MONITOR 2200pF FIGURE 3 MONITORING TMP AND SD OUTPUTS PowerAmp Design PAD137 RAIL TO RAIL OPERATIONAL AMPLIFIER 11

181 PowerAmp Design COMPACT HIGH VOLTAGE OP AMP PAD183 Rev B KEY FEATURES LOW COST SMALL SIZE 40mm SQUARE HIGH VOLTAGE 350 VOLTS HIGH OUTPUT CURRENT 1.5A 35 WATT DISSIPATION CAPABILITY 100kHz POWER BANDWIDTH 330Vp-p 100V/µS SLEW RATE APPLICATIONS HIGH VOLTAGE INSTRUMENTATION ELECTROSTATIC TRANSDUCERS ELECROSTATIC DEFLECTION PIEZO TRANSDUCER DRIVE DESCRIPTION The PAD183 high voltage operational amplifier is constructed with surface mount components to provide a low cost solution for many industrial applications. With a footprint only 40mm square, similar to the footprint of the TO3 hybrid package, the PAD183 offers outstanding performance that outperforms the more expensive hybrid amplifiers. Integrated heat sink and fan cooling is included. User selectable external compensation tailors the amplifier s response to application requirements. The PAD183 is built on a thermally conductive but electrically insulating metal substrate. No BeO is used in the PAD183. For custom applications the PAD183-1 is available without the integrated heat sink and fan cooling. PAD183 PAD183-1 PAD183 MOUNTED IN EVAL183 EVALUATION KIT A NEW CONCEPT A critical task in any power amplifier application is cooling the amplifier. Until now component amplifier manufacturers often treated this task as an after-thought, left for the user to figure out. At Power Amp Design the best heat sink and fan is chosen at the start and becomes an integral part of the overall amplifier design. The result is the most compact and volumetric efficient design combination at the lowest cost. In addition, this integrated solution concept offers an achievable real-world power dissipation rating, not the ideal rating usually cited when the amplifier case is somehow kept at 25 o C. The user no longer needs to specify, procure or assemble separate components. PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP

182 COMPACT HIGH VOLTAGE OP AMP PAD183 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT PINOUT & CONNECTIONS Cc AC SUB Cc1 Cc2+Vcc +Vs OUT1 VIEW FROM COMPONENT SIDE -IN +IN NC -Vcc Vs C3 + OUT2 NC NC -Vs C4 PHASE COMPENSATION SLEW RATE GAIN Cc 1 150pF 15V/uS 2 47pF 50V/uS > = 4 22pF 100V/uS + C2 C1 +Vs LOAD SEE APPLICATION NOTES FOR ALTERNATIVE CONNECTIONS PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 2

183 PAD183 COMPACT HIGH VOLTAGE OP AMP ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 4 350V TEMPERATURE, pin solder, 10s, 300 C SUPPLY VOLTAGE, +Vcc to Vcc 4 350V TEMPERATURE, junction C INPUT VOLTAGE +Vcc to Vcc TEMPERATURE RANGE, storage 40 to 70 C 5 DIFFERENTIAL INPUT VOLTAGE ± 20V TEMPERATURE RANGE, storage, PAD C OUTPUT CURRENT, peak, within SOA 1.5A OPERATING TEMPERATURE, substrate 40 to 85 C POWER DISSIPATION, internal, DC 35W PARAMETER TEST CONDITIONS 1 MIN TYP MAX PAD UNITS INPUT OFFSET VOLTAGE 1 5 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C OFFSET VOLTAGE vs. supply 3 μv/v BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G Ω INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vs 15 V COMMON MODE VOLTAGE RANGE Vs+8 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1kΩ R S 10 μv RMS GAIN OPEN LOOP, DC R L = 10kΩ, C C =22pF db GAIN BANDWIDTH 1MHz C C =22pF 18 MHz PHASE MARGIN Full temperature range 60 degree OUTPUT VOLTAGE SWING I O = 1.5A +Vs 10 +Vs 6.5 V VOLTAGE SWING I O = 1.5A Vs+10 Vs+7 V CURRENT, continuous, DC 1.5 A SLEW RATE, A V = 50 C C = 22 pf 100 V/μS SETTLING TIME, to 0.1% 2V Step, C C = 22 pf 4 μs RESISTANCE No load, DC 16 Ω POWER SUPPLY VOLTAGE ± 15 ± 150 ± 175 V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to air or case 6 Full temperature range, f 60Hz 2.4 to air 2.1 to case O C/W RESISTANCE, DC junction to air or case Full temperature range 3.6 to air 3.1 to case O C/W TEMPERATURE RANGE, substrate O C TEMPERATURE RANGE, ambient NA O C FAN, 40mm dc brushless, ball bearing OPERATING VOLTAGE 12 NA V OPERATING CURRENT 50 NA ma AIR FLOW 7.5 NA CFM RPM 7000 NA RPM NOISE 30 NA db L10, life expectancy, 50 O C 8 45 NA khrs L10, life expectancy, 25 O C 8 60 NA khrs NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 150pF, DC input specifications are ± value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages to the output stage. +Vcc and Vcc denote the positive and negative supply voltages to the small signal stages. +Vcc and Vcc may not be more than + and 15V greater than +Vs and Vs respectively. 5. Limited by fan characteristics. During operation, even though the heat sink may be at 85 O C the fan will be at a lower temperature. 6. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. 7. Power supply voltages +Vcc and Vcc must not be less than +Vs and Vs respectively. Total voltage +Vcc to Vcc 350V maximum. 8. L10 refers to the time it takes for 10% of a population of fans to fail. Lower ambient temperature increases fan life. 9. Specifications for the PAD183-1 are the same as for the PAD183 except as shown in this column. PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 3

184 COMPACT HIGH VOLTAGE OP AMP PAD183 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD183 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands-off method whereby test equipment probes are attached only when power is off. COOLING FAN The PAD183 relies on its fan for proper cooling of the amplifier. Make sure that air flow to the fan and away from the heat sink remains unobstructed. The cooling method used is impingement cooling, which means that cool air is pushed into the heat sink and warm air is exhausted through the spaces between the heat sink fins. To eliminate electrical noise created by the cooling fan we recommend a 47µF capacitor placed directly at the point where the fan wires connect to the PCB. See application note AN-24 for further details. MOUNTING THE PAD183 AMPLIFIER The amplifier is supplied with four 4-40 M/F hex spacers at the four corners of the amplifier. Once the amplifier is seated, secure the module with the provided 4-40 nuts and torque to 4.7 in lb [53 N cm] max. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. This can easily be done by providing a grounded circuit board pad around any of the holes for the mounting studs. MOUNTING THE PAD183-1 AMPLIFIER In most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD183-1 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth several times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 4-40 hex male-female spacers and torque to 4.7 in lb [53 N cm] max. Mount the amplifier to the mother board with 4-40 X 1/4 screws. See Dimensional Information for additional recommendations. PHASE COMPENSATION The PAD183 must be phase compensated. The compensation capacitor, C C, is connected between pins 2 and 3. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (350V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance values for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 10pF is not recommended. PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 4

185 COMPACT HIGH VOLTAGE OP AMP PAD183 TYPICAL PERFORMANCE GRAPHS TOTAL POWER DISSIPATION, P D (W) OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V POWER DERATING PAD183 USE CASE TEMP FOR PAD183-1 USE AMBIENT TEMP FOR PAD183 PAD CASE OR AMBIENT AIR TEMPERATURE, T ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T C =25 O C, +OUTPUT T C =25 O C, -OUTPUT OUTPUT AMPS, A NORMALIZED QUIESCENT CURRENT, I Q (%) DISTORTION, % NORMALIZED QUIESCENT CURRENT, IQ(%) QUIESCENT CURRENT VS SUPPLY VOLTAGE Vs ONLY BOTH -Vs ONLY TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -33 Cc = 22pF 32Ω LOAD ±Vs = ±60V HARMONIC DISTORTION 36W OUT 3.6W OUT k k 30k FREQUENCY, F(Hz) PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 5

186 COMPACT HIGH VOLTAGE OP AMP PAD183 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=22pF Cc=150pF Cc=47pF ] k k 100k 1M M FREQUENCY, F(Hz) POWER RESPONSE CC=150pF k k k M 2M FREQUENCY, F(Hz) CC =47pF CC =22pF PHASE, Θ( O ) Cc=150pF Cc=47pF k k M M FREQUENCY, F(Hz) G=-36, Cc=22pF Cc=22pF PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP G=-36, Cc=22pF 6

187 COMPACT HIGH VOLTAGE OP AMP PAD183 SAFE OPERATING AREA 2 SAFE OPERATING AREA 100μS OUTPUT CURRENT, Io (A) 1 DC, 30 O C AMBIENT PULSE 3% DUTY CYCLE 1S SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA The safe operating area (SOA) of a power amplifier is its single most important specification. The SOA graph presented above serves as a first approximation to help you decide if the PAD183 will meet the demands of your application. But a more accurate determination can be reached by making use of the PAD Power spreadsheet which can be downloaded from the website. While the graph above adequately shows DC SOA and some pulse information it does not take into account ambient temperatures higher than 30 O C, AC sine, phase or non-symmetric conditions that often appear in real-world applications. The PAD Power spreadsheet takes all of these effects into account. 10S 50S 10mS 100mS ] ] ] 1mS PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 7

188 COMPACT HIGH VOLTAGE OP AMP PAD183 DIMENSIONAL INFORMATION PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 8

189 COMPACT HIGH VOLTAGE OP AMP PAD183 DIMENSIONAL INFORMATION CONTINUED PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 9

190 COMPACT HIGH VOLTAGE OP AMP PAD183 APPLICATION CIRCUITS 100k +335V 10Vp-p INPUT SIGNAL * *C1 R1 *R2 3.01k uF 100uF 0.22uF + 4 +Vcc 6 +Vs PAD183 5,8 OUT Cc 3 -Vs -Vcc pF -15V +325V 315Vp-p OUTPUT LOAD R1=R2 * VALUES DEPEND ON FREQUENCY RANGE REQUIRED FIGURE 1. SINGLE HIGH-CURRENT POWER SUPPLY CIRCUIT 10Vp-p INPUT SIGNAL 3.16k k +175V 100uF 0.22uF + 4 +Vcc 6 +Vs PAD183 5,8 OUT Cc 3 -Vs -Vcc pF -175V 100uF 0.22uF +165V LOAD -165V +10V 330Vp-p OUTPUT FIGURE 2. DUAL HIGH-CURRENT POWER SUPPLY CIRCUIT + PowerAmp Design PAD183 COMPACT HIGH VOLTAGE OP AMP 10

191 PowerAmp Design COMPACT POWER OP AMP KEY FEATURES LOW COST HIGH VOLTAGE 100 VOLTS HIGH OUTPUT CURRENT 5 AMPS 50 WATT DISSIPATION CAPABILITY 100 WATT OUTPUT CAPABILITY 0.63 HEIGHT SIP DESIGN APPLICATIONS LINEAR MOTOR DRIVE HIGH VOLTAGE INSTRUMENTATION SEMICONDUCTOR TESTING TEST EQUIPMENT DESCRIPTION The PAD541 compact operational amplifier is constructed with surface mount components to provide a cost effective solution for many industrial applications. The SIP design is only 0.63 high and provides clearance for those applications where circuit boards are mounted side by side in a card cage. The PAD541 exceeds the performance of monolithic amplifiers while having a similar height dimension. User selectable external compensation tailors the amplifier s response to the application requirements. Programmable current limit is built-in. The amplifier circuitry is built on a thermally conductive but electrically insulating substrate. No BeO is used in the PAD541. The resulting module is a small, high performance turn-key solution for many industrial applications. PAD541 PAD541 Rev D PowerAmp Design PAD541 COMPACT POWER OP AMP

192 COMPACT POWER OP AMP PAD541 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN +IN PINOUT & CONNECTIONS IL CC1 Cc CC2 OUT +VS -VS R S PAD541 VIEW FROM COMPONENT SIDE PHASE COMPENSATION GAIN Cc SLEW V/uS 1 220pF 4 > 3 100pF 10 > 10 47pF 14 TO FEEDBACK & LOAD C1 C2 C3 C4 0.1uF 18uF + 18uF 0.1uF PowerAmp Design PAD541 COMPACT POWER OP AMP 2

193 PAD541 COMPACT POWER OP AMP ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 100V INPUT VOLTAGE +Vs to Vs OUTPUT CURRENT, peak 7A, within SOA DIFFERENTIAL INPUT VOLTAGE 20V POWER DISSIPATION, internal, DC 50W TEMPERATURE, pin solder, 10s 300 C TEMPERATURE, junction C TEMPERATURE RANGE, storage 40 to 105 C OPERATING TEMPERATURE, case 40 to 105 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT OFFSET VOLTAGE 1 3 mv OFFSET VOLTAGE vs. temperature Full temperature range V/ O C OFFSET VOLTAGE vs. supply 20 V/V BIAS CURRENT, initial pa BIAS CURRENT vs. supply 0.1 pa/v OFFSET CURRENT, initial 50 pa INPUT RESISTANCE, DC 100 G INPUT CAPACITANCE 4 pf COMMON MODE VOLTAGE RANGE +Vs 10 V COMMON MODE VOLTAGE RANGE Vs+0 Vs+1.5 V COMMON MODE REJECTION, DC db NOISE 100kHz bandwidth, 1k R S 10 V RMS GAIN OPEN LOOP R L = 10k C C =100pF 108 db GAIN BANDWIDTH 1MHz C C =100pF 2 MHz PHASE MARGIN Full temperature range 45 degree OUTPUT VOLTAGE SWING I O = 5A +Vs 7 +Vs 6 V VOLTAGE SWING I O = 5A Vs+7 Vs+6 V CURRENT, continuous, DC 5 A SLEW RATE, A V = 10 C C = 100pF V/ S SETTLING TIME, to 0.1% 2V Step, C C = 100pF 6 S RESISTANCE No load, DC 8 POWER SUPPLY VOLTAGE V CURRENT, quiescent ma THERMAL RESISTANCE, AC, junction to case 5 Full temperature range, f 60Hz 2.3 RESISTANCE, DC junction to case Full temperature range 2.5 TEMPERATURE RANGE, case NOTES: 1. Unless otherwise noted: T C = 25 O C, compensation Cc = 470pF, DC input specifications are value given, power supply voltage is typical rating. 2. Derate internal power dissipation to achieve high MTBF. 3. Doubles for every 10 O C of case temperature increase. 4. +Vs and Vs denote the positive and negative supply voltages. 5. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz. O C/W O C/W O C PowerAmp Design PAD541 COMPACT POWER OP AMP 3

194 COMPACT POWER OP AMP PAD541 OPERATING CONSIDERATIONS SAFETY FIRST The operating voltages of the PAD541 are potentially deadly. When developing an application circuit it is wise to begin with power supply voltages as low as possible while checking for circuit functionality. Increase supply voltages slowly as confidence in the application circuit increases. Always use a hands off method whereby test equipment probes are attached only when power is off. CURRENT LIMIT The current limiting function of the PAD541 is externally programmable. See Figure 1. The sense voltage for current limit is 0.65V. Thus: IL 0.65V Where I L is the value of the limited current and R S is the value of the current limit sense resistor. In addition, the sense voltage has a temperature coefficient approximately equal to 2.2mV/ o C case temperature. IN R IN IL RS R F Figure 1 OUT 6 MOUNTING THE AMPLIFIER In most applications the amplifier must be attached to a heat sink. Spread a thin and even coat of heat sink grease across the back of the PAD541 and also the heat sink where the amplifier is to be mounted. Push the amplifier into the heat sink grease on the heat sink while slightly twisting the amplifier back and forth a few times to bed the amplifier into the heat sink grease. On the final twist align the mounting holes of the amplifier with the mounting holes in the heat sink and finish the mounting using 2-56 screw and a #2 stainless steel internal tooth lock washer. The lock washer helps to electrically connect the substrate to the heat sink (that should be grounded). Torque the screws to 2.2 in-pound (0.248 N meter) maximum. Do not rely on the screw pressure to squeeze out any excess heat sink grease as this will likely only bend the substrate at the R S R L corners. See Dimensional Information for a detailed drawing. It is recommended that the heat sink be grounded to the system ground. PHASE COMPENSATION The PAD541 must be phase compensated. The compensation capacitor, C C, is connected between pins 4 and 5. The compensation capacitor must be an NPO type capacitor rated for the full supply voltage (100V). On page 2, under Amplifier Pinout and Connections, you will find a table that gives recommended compensation capacitance value for various circuit gains and the resulting slew rate for each capacitor value. Consult also the small signal response and phase response plots for the selected compensation value in the Typical Performance Graphs section. A compensation capacitor less than 47pF is not recommended. PowerAmp Design PAD541 COMPACT POWER OP AMP 4

195 COMPACT POWER OP AMP PAD541 TYPICAL PERFORMANCE GRAPHS OFFSET VOLTAGE,Vos (mv) OUTPUT SWING FROM +Vs OR -Vs, V TOTAL POWER DISSIPATION, P D (W) POWER DERATING CASE TEMPERATURE, T C ( O C) CASE TEMP, O C OFFSET VOLTAGE DRIFT OUTPUT SWING FROM SUPPLY RAILS T C =25 O C, -OUTPUT T C =25 O C, +OUTPUT NORMALIZED QUIESCENT CURRENT, I Q (%) NORMALIZED QUIESCENT CURRENT, IQ(%) DISTORTION, % QUIESCENT CURRENT VS SUPPLY VOLTAGE TOTAL SUPPLY VOLTAGE, (V) QUIESCENT CURRENT VS TEMPERATURE CASE TEMPERATURE, O C Av = -10 Cc = 100pF 8 LOAD Vs = V 7.6W HARMONIC DISTORTION 76W PowerAmp Design PAD541 COMPACT POWER OP AMP OUTPUT AMPS, A k k 30k FREQUENCY, F(Hz) 5

196 COMPACT POWER OP AMP PAD541 TYPICAL PERFORMANCE GRAPHS 120 SMALL SIGNAL RESPONSE -90 SMALL SIGNAL PHASE RESPONSE Cc=220pF OPEN LOOP GAIN, A(dB) OUTPUT VOLTAGE SWING, V(p-p) Cc=220pF Cc=47pF Cc=100pF k k 100k 1M M FREQUENCY, F(Hz) k k k 500k FREQUENCY, F(Hz) POWER RESPONSE CC =220pF CC =100pF CC=47pF PHASE, ( O ) TEMP OUTPUT, VOLTS (V) Cc=47pF Cc=100pF k k M 2M FREQUENCY, F(Hz) TEMPERATURE OUTPUT SUBSTRATE TEMPERATURE, O C PowerAmp Design PAD541 COMPACT POWER OP AMP 1kHz sine clipped by current limit into 100Ω load 20kHz sine into 8Ω load, G=-10,C C =100pF 6

197 COMPACT POWER OP AMP PAD541 PERFORMANCE GRAPHS CONTINUED Pulse Response, Negative to Positive, 250Ω Load G=-10, Cc=100pF Pulse Response, Positive to Negative, 250Ω Load G=-10, Cc=100pF PowerAmp Design PAD541 COMPACT POWER OP AMP 7

198 COMPACT POWER OP AMP PAD541 SAFE OPERATING AREA 10 SAFE OPERATING AREA 100 S OUTPUT CURRENT, Io (A) DC PULSE 3% DUTY CYCLE 100mS 10mS SUPPLY TO OUTPUT DIFFERENTIAL,Vs-Vo (V) SAFE OPERATING AREA 1mS PowerAmp Design PAD541 COMPACT POWER OP AMP 8

199 COMPACT POWER OP AMP PAD541 DIMENSIONAL INFORMATION 1 TS1 8 PowerAmp Design PAD541 COMPACT POWER OP AMP 10

200 Power Amp Design Accessory Modules

201 PowerAmp Design CURRENT LIMIT ACCESSORY MODULE KEY FEATURES LOW COST ACCESSORY FLOATING CURRENT SENSE MULTIPLE MODE OPERATION WIDE SUPPLY RANGE ± 8V ± 250V GROUND REFERENCED OUTPUT CONVENIENT SIP PIN-OUT APPLICATIONS HIGH POWER AMPLIFIER ADD-ON REPLACE LINEAR CURRENT LIMIT AMPLIFIER PROTECTION CIRCUIT DESCRIPTION The PAD125 current limit accessory module was designed to extend the protection circuitry for high power amplifiers and avoid current limit induced oscillations that often occur in high output current amplifiers. To keep power dissipation in the current sense resistor to a minimum the PAD125 operates with a precision 150mV floating sense input and converts the floating sense inputs to ground referenced 5V logic signals. Traditional current limit circuitry does not guarantee that the amplifier will survive over-current conditions. The PAD125 can operate in several modes. It can latch off the host amplifier when an over-current condition exists immediately or after an externally set time delay set by a simple RC circuit. The circuit can also auto-reset with another RC circuit time delay. In addition the host amplifier can be shut down or reset from system logic inputs. PAD125 Rev C PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

202 CURRENT LIMIT ACCESSORY MODULE PAD125 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT -IN 46 +IN 45 1 SUB NC 44 PAD125 TYPICAL CONNECTIONS TO PAD126 Cc OUT NC +Vcc CC2 CC1 TEMP SD GND NC NC NC NC NC +Vs NC PAD126 VIEW FROM COMPONENT SIDE -Vcc NC NC +IL -IL IC Vs NC NC NC NC -Vcc NC NC OUT RESET OUT SD STATUS GND -Vs NC +IL -IL IC +Vs +5V OUT Rs TO FEEDBACK & LOAD PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE PAD125 VIEW FROM COMPONENT SIDE 2

203 PAD125 CURRENT LIMIT ACCESSORY MODULE ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 500V INPUT VOLTAGE +Vs to Vs OPERATING TEMPERATURE 40 to 70 C DIFFERENTIAL INPUT VOLTAGE ± 5V TEMPERATURE, pin solder, 10s 200 C TEMPERATURE RANGE, storage 40 to 125 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUTS +IL, -IL OFFSET VOLTAGE ± 1 ± 6 mv OFFSET VOLTAGE vs. temperature Full temperature range μv/ O C COMMON MODE VOLTAGE RANGE ± Vs m 5 V COMMON MODE REJECTION, DC 96 db OUTPUTS OUT, open collector, low I O = 2mA V OUT, open collector, high, pull-up voltage 2 I O = 100uA 500 V STATUS Logic output V +5V OUT, I O 100 μa SENSE VOLTAGE Full temperature range ± 150 mv POWER SUPPLY VOLTAGE ± 8 ± 150 ± 250 V CURRENT, quiescent ma PROPAGATION DELAY +IL, -IL TO OUTPUT 10mV overdrive <2 μs +IL, -IL TO OUTPUT 10mV overdrive <2 μs RESET TO OUT <1 μs SD TO OUT <1 μs PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE NOTES: 1. Unless otherwise noted: T C =25 O C 2. Power dissipation in the open collector output transistor is limited to 200mW (full temperature range). Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

204 CURRENT LIMIT ACCESSORY MODULE PAD125 OPERATING CONSIDERATIONS COMMON MODE RANGE The sense voltage inputs of the PAD125 (+IL, -IL, ISC) float with the output of the host amplifier (PAD119, for example) and can swing within 5V of either supply rail SENSE VOLTAGE The output (OUT, pin 2) is set to trip (go low) when: IS-ISC > 150mV or ISC-IS > 150mV Where IS represents +IL and -IL tied together for normal operation. +IL and -IL can be separated for fold-over current limiting. For fold-over current limit operation OUT is set to trip when: (+IL)-ISC> 150mV or ISC-(-IL) > 150mV This 150mV reference is generated internally and cannot be changed by the user. In all cases the circuit is tripped when: Io > ±150mV/Rs where Io is the host amplifier output current and Rs is the current limit sense resistor value. OUTPUT The output (OUT, pin 2) is an open collector circuit and is intended to be tied to the host amplifier SD input. The SD input of the host amplifier has an internal pull-up circuit so if OUT is used without the host amplifier an external 10k pull-up resistor will be required. STATUS OUTPUT STATUS, pin 4, is the output that alerts external circuitry that the current set point has been exceeded and goes high (5V logic) when this occurs. In various modes of operation STATUS is connected to the shutdown input (SD) and/or RESET. See Applications Circuits for illustrations on how to use the several modes of operation. SD AND RESET INPUTS The SD (shutdown) and RESET inputs can be operated from system logic signals as required. These are 5V logic inputs. If not used these inputs are required to be tied to ground or pulled down by 10kΩ. If these inputs are operated from an open collector circuit an external pull-up resistor is required. Do not confuse the SD input of the PAD125 with the SD input of the host amplifier. OPERATING MODES It is possible to operate the PAD125 in several modes without the need for any external logic circuits by using a few external passive components. For each of the operating modes see Figure 3 in Application Circuits. In Mode 1 (Figure 3a) the STATUS output is tied directly to SD. When the output current of the host amplifier exceeds the trip point, OUT immediately goes low and latches off the output stage of the host amplifier. To restart the host amplifier a high on the RESET pin is required. In Mode 2 (Figure 3b) the STATUS output is tied to the SD input through a RC circuit (R1, C1). The RC circuit provides a time delay. This is useful when, for example, it is known that the host amplifier output current will exceed the set point current for a short time and still not exceed the SOA of the amplifier. This might occur when starting a motor, for example. The time delay can be calculated by: T=RC Where T is the time delay, R is the resistance in ohms and C is the capacitance in farads. The minimum resistor value is 100kΩ and the maximum C value is 2.2nF. In Mode 3 (Figure 3c) an auto-reset can be applied by adding R2, C2 to the RESET input. This time delay must be greater than R1, C1 but operates in the same way and is calculated in the same way. Mode 3 can be used with Mode 1 if desired. In this mode if the over-current condition still exits after the reset time delay the PAD125 will keep the host amplifier shut down indefinitely. The circuit can be restarted by cycling the power or over-driving the reset input with a momentary external 5V pulse. Note that any unused input pins must be grounded (pins 1 or 3). EVALUATION KITS Connections for the PAD125 are incorporated into the printed circuit boards included with evaluation kits for compatible amplifier models. Either standard or fold-over current limit can be implemented. Bread-boarding pads are provided to connect the PAD125 in any of the operating modes discussed above. PAD Power is a free Excel based spreadsheet available on the Power Amp Design website that will assist in calculating values needed to implement the fold-over current limit as well as analyzing many other design issues when using Power Amp Design products. PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE 4

205 CURRENT LIMIT ACCESSORY MODULE PAD125 TYPICAL PERFORMANCE GRAPHS Propagation delay: +IL (Ch1) to OUT (Ch2) Propagation delay: Reset (Ch1) to Out (Ch2), 10k pullup Propagation delay: SD (Ch1) to OUT (Ch2) Delay: +IL (Ch1) to OUT (Ch2), RC=100µS, Pins 4 to 3 PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE 5

206 CURRENT LIMIT ACCESSORY MODULE PAD125 DIMENSIONAL INFORMATION 1 12 PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE 6

207 CURRENT LIMIT ACCESSORY MODULE PAD125 APPLICATION CIRCUITS STATUS 4 STATUS 4 STATUS 4 TO SD OF HOST AMPLIFIER SYSTEM LOGIC SD 3 OUT 2 RESET 1 GND 5 1N4148 TO SD OF HOST AMPLIFIER SYSTEM LOGIC R1 C1 SD 3 OUT TO SD OUT 2 OF HOST 2 AMPLIFIER RESET 1 GND 5 SD 3 RESET 1 GND 5 MODE 1 MODE 2 MODE 3 FIGURE 3a FIGURE 3b FIGURE 3c FIGURE 3 OPERATING MODES 1N4148 R2 C2 R1 C1 PowerAmp Design PAD125 CURRENT LIMIT ACCESSORY MODULE 7

208 PowerAmp Design POWER SUPPLY ACCESSORY MODULE PAD130 Rev D KEY FEATURES LOW COST ACCESSORY DUAL BOOST VOLTAGE OUTPUT WIDE SUPPLY RANGE ± 8V ± 50V CONVENIENT SIP PIN-OUT APPLICATIONS HIGH POWER AMPLIFIER ADD-ON TURNS PAD128 INTO A RAIL-TO-RAIL AMPLIFIER INCLUDING SINGLE SUPPLY OPERATION DESCRIPTION The PAD130 power supply accessory module is a compact dual switching power supply designed to provide a convenient, low-cost power supply that converts the PAD128 High Power Operational Amplifier into a RRIO amplifier (rail to rail input and rail to rail output). With input voltages of +Vs and Vs the PAD130 produces output voltages of +Vs+9 and Vs 9 volts. The output voltages are connected to the PAD128 +Vcc and Vcc power supply pins. Consequently, the small signal stages of the PAD128 operate at higher voltages than the main power supply voltages, thus biasing the small signal stages such that RRIO operation is assured. The PAD130 comes mounted to a heat sink for drop-in operation. PowerAmp Design PAD130 POWER SUPPLY ACCESSORY MODULE Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

209 POWER SUPPLY ACCESSORY MODULE PAD130 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT PAD130 TYPICAL CONNECTION TO PAD BALSUB+VccCc1 Cc2 NC OUT1 +Vs PAD128 VIEW FROM COMPONENT SIDE -IN +IN -Vcc NC SD GNDTMP NC OUT2 -Vs Vs -Vcc OUT AC SUB NC +Vs +Vcc OUT C4 + C4 C2 + C1 PowerAmp Design PAD130 POWER SUPPLY ACCESSORY MODULE PAD130 VIEW FROM COMPONENT SIDE 2

210 PAD130 POWER SUPPLY ACCESSORY MODULE ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 100V OUTPUT CURRENT ± 25mA OPERATING TEMPERATURE, case 40 to +70 C OUTPUT VOLTAGE, ± Vcc ± Vs ± 10V TEMPERATURE, pin solder, 10s 200 C TEMPERATURE RANGE, storage 40 to 125 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS POWER INPUTS, +Vs, -Vs +Vs Full temperature range V Vs Full temperature range V +Vs to Vs Full temperature range V OUTPUTS +Vcc I O = 20mA +Vs+8.4 +Vs+10 V Vcc I O = 20mA Vs 9 Vs 10 V Switching frequency 25 khz Ripple voltage I O = ± 20mA 20 mvp-p PowerAmp Design PAD130 POWER SUPPLY ACCESSORY MODULE NOTES: 1. Unless otherwise noted: T C =25 O C Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

211 POWER SUPPLY ACCESSORY MODULE PAD130 OPERATING CONSIDERATIONS POWER SUPPLY INPUTS The PAD130 is normally powered by the same voltages used to power the host amplifier. The PAD130 has its own input and output filter capacitors and so no additional bypassing is necessary. A current input ripple can be observed approximately twice the output load current at a duty cycle of 50%. The PAD130 can be operated from a single power supply voltage, for example, zero (ground) and +50V. In this case the output voltages will be approximately -9V and +58.5V. OUTPUT VOLTAGES The PAD130 output voltages are approximately 9V greater than the input power supply voltages. These voltages are tied to the ±Vcc inputs for the host operational amplifier (see Fig. 2) on page 2. The output voltages have some ripple at approximately 20 khz. The host amplifier s power supply rejection is able to reject most of the ripple amplitude but about 1 mvp-p (RTI) of residual ripple may be found at the output of the amplifier. The ripple can be reduced by adding external filter capacitors, but this is usually unnecessary. EVALUATION KITS Connections for the PAD130 are incorporated into the printed circuit boards included with the evaluation kits for compatible amplifiers such as the PAD128 (evaluation kit EVAL128). PowerAmp Design PAD130 POWER SUPPLY ACCESSORY MODULE 4

212 POWER SUPPLY ACCESSORY MODULE PAD130 PERFORMANCE GRAPHS +VCC OUTPUT RIPPLE -VCC OUTPUT RIPPLE The oscilloscope display at the right shows the PAD130 -Vcc output voltage ripple. The ripple can be reduced by adding an external filtering capacitor, but the amplifier rejects a large portion of this ripple. See below. PAD128 OUTPUT VOLTAGE RIPPLE DUE TO PAD130 OUTPUT RIPPLE, G=10 The oscilloscope display at the left shows the PAD130 +Vcc output voltage ripple. The ripple can be reduced by adding an external filtering capacitor, but the amplifier rejects a large portion of this ripple. AMPLIFIER OUTPUT RIPPLE WITH PAD130 POWER SUPPLY The oscilloscope display at the left shows the PAD128 amplifier output voltage ripple due to the PAD130 power supply ripple with the amplifier in a gain of 10. The ripple is about 10mVp-p in a gain of 10. Referred to the input the ripple is about 1mVp-p. The ripple can be reduced by adding external filtering capacitors, but the amplifier rejects a large portion of this ripple as can be seen by comparing this amplifier output ripple to the power supply output ripple as seen in the oscilloscope displays above. PowerAmp Design PAD130 POWER SUPPLY ACCESSORY MODULE 5

213 POWER SUPPLY ACCESSORY MODULE PAD130 DIMENSIONAL INFORMATION PowerAmp Design PAD130 POWER SUPPLY ACCESSORY MODULE 6

214 PowerAmp Design FAN CONTROLLER MODULE KEY FEATURES LOW COST ACCESSORY REDUCES AUDIBLE FAN NOISE INCREASES FAN LIFE CONVENIENT SIP PIN-OUT OPERATES FROM VOLTS APPLICATIONS HIGH POWER AMPLIFIER ADD-ON REDUCED POWER APPLICATIONS AUDIBLE NOISE SENSITIVE APPLICATIONS DESCRIPTION The PAD131 fan controller module works with all power op amps offered by Power Amp Design and may be added to the application circuit at any time. The module was designed to extend fan life and reduce audible fan noise for those power amplifier applications where maximum cooling is not required. The PAD131 monitors the substrate temperature output of the host power amplifier and adjusts its cooling fan rpm to keep the heat sink temperature to 65 O C or less where possible. Many power amplifier applications either do not require maximum cooling or the application makes intermittent high power demands. When the temperature rises above 65 O C the module drives the cooling fan at maximum RPM for maximum cooling and throttles back the rpm as the temperature falls. The number one failure mechanism in fans is bearing wear. Lower fan rpm translates into less wear on the bearings and less audible noise. PAD131 Rev C PowerAmp Design PAD131 FAN CONTROLLER MODULE Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

215 FAN CONTROLLER MODULE PAD131 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT PAD131 TYPICAL CONNECTION TO HOST AMPLIFIER -IN +IN -Vcc BAL SUB+Vcc Cc1 Cc2 NC NC GND PAD118 VIEW FROM COMPONENT SIDE SD 26 IN GND 25 NC TMP 24 +FAN NC NC OUT1 +Vs +12V TO +15V -Vs OUT V _ + FAN PowerAmp Design PAD131 FAN CONTROLLER MODULE PAD131 VIEW FROM COMPONENT SIDE 2

216 PAD131 FAN CONTROLLER MODULE ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to GND 15.5V INPUT VOLTAGE 5V OPERATING TEMPERATURE 40 to 70 C OUTPUT CURRENT 250mA TEMPERATURE, pin solder, 10s 200 C TEMPERATURE RANGE, storage 40 to 125 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS INPUT VOLTAGE +IN 0 5 V OUTPUT CURRENT 210 ma VOLTAGE 25C-65C temp voltage from host amp V POWER SUPPLY VOLTAGE V CURRENT, quiescent 3 4 ma PowerAmp Design PAD131 FAN CONTROLLER MODULE Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

217 FAN CONTROLLER MODULE PAD131 OPERATING CONSIDERATIONS FAN CONTROLLER FUNCTION Not all power amplifier applications require maximum cooling of the amplifier. An amplifier capable of dissipating 100W, for example, might not be required to dissipate more than 50W or even less in its application circuit. Yet, in either case the cooling fan will be operating at maximum rpm. Maximum fan rpm will keep the amplifier at the lowest operating temperature, but this may not be necessary even when considering amplifier reliability. Overall reliability also must consider the cooling fan. The leading cause of fan failures is bearing wear. Even though the L10 rating of the fans supplied with all of our amplifiers is 45k hours some applications may benefit from an even longer life. The PAD131 monitors the analog output (TMP) of host amplifier and adjusts the rpm of the fan accordingly. As the substrate temperature of the host amplifier rises, the rpm of cooling fan increases and decreases the operating temperature of the host amplifier. As the operating temperature of the host amplifier rises to 65C, the PAD131 will increase the rpm of the cooling fan from minimum (perhaps off) to maximum. When the operating temperature of the host amplifier reaches 65C or above maximum cooling is applied to the amplifier. Any operating condition that allows the amplifier to operate at a temperature lower than 65C can benefit from the PAD131 Fan Controller Module. At lower operating temperatures the rpm of the fan decreases thus extending its life by reducing bearing wear. At the same time, lower fan rpm results in less audible fan noise. Applications that require less than maximum cooling such as applications where higher power dissipation in the amplifier is intermittent will benefit the most. The operating temperature of the host amplifier can be predicted using the PAD Power Excel based design spreadsheet available on the Power Amp Design web site. PowerAmp Design PAD131 FAN CONTROLLER MODULE 4

218 FAN CONTROLLER MODULE PAD131 DIMENSIONAL INFORMATION 1 6 PowerAmp Design PAD131 FAN CONTROLLER MODULE 5

219 PowerAmp Design POWER SUPPLY ACCESSORY MODULE PAD132 Rev B KEY FEATURES LOW COST ACCESSORY DUAL BOOST VOLTAGE OUTPUT WIDE SUPPLY RANGE ± 8V ± 150V CONVENIENT SIP PIN-OUT APPLICATIONS HIGH POWER AMPLIFIER ADD-ON ASSISTS POWER AMPS FOR SINGLE SUPPLY APPLICATIONS DESCRIPTION The PAD132 power supply accessory module is a compact dual switching power supply designed to provide a convenient, low-cost power supply that assists power amps to operate from a single highpower supply voltage. The PAD132 is compatible with the PAD115, PAD119 and PAD129 High Power Operational Amplifiers. With input voltages of +Vs and Vs the PAD132 produces output voltages of +Vs+9 and Vs 9 volts. The output voltages are connected to the amplifier s +Vcc and Vcc power supply pins. Consequently, the small signal stages of the amplifier operate at higher voltages than the main power supply voltages, thus biasing the small signal stages such that single supply operation is assured by avoiding input stage common mode range violations. The PAD132 comes mounted to a heat sink for drop-in operation. PowerAmp Design PAD132 POWER SUPPLY ACCESSORY MODULE Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site:

220 POWER SUPPLY ACCESSORY MODULE PAD132 CIRCUIT & CONNECTIONS EQUIVALENT CIRCUIT PAD132 TYPICAL CONNECTION TO PAD119 OR PAD115 -IN +IN -Vcc BAL SUB+VccCc1 Cc2 NC PAD115 OR PAD119 VIEW FROM COMPONENT SIDE NC 27 SD 26 GND 25 TMP 24 NC OUT1 +Vs -Vs OUT C Vs -Vcc OUT AC SUB NC +Vs +Vcc OUT C C2 + C1 PowerAmp Design PAD132 POWER SUPPLY ACCESSORY MODULE PAD132 VIEW FROM COMPONENT SIDE 2

221 PAD132 POWER SUPPLY ACCESSORY MODULE ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS SUPPLY VOLTAGE, +Vs to Vs 300V OUTPUT CURRENT ± 12mA OPERATING TEMPERATURE, case 40 to +70 C OUTPUT VOLTAGE, ± Vcc ± Vs ± 10V TEMPERATURE, pin solder, 10s 200 C TEMPERATURE RANGE, storage 40 to 125 C PARAMETER TEST CONDITIONS 1 MIN TYP MAX UNITS POWER INPUTS, +Vs, -Vs +Vs Full temperature range V Vs Full temperature range V +Vs to Vs Full temperature range V OUTPUTS +Vcc I O =12mA +Vs+8.4 +Vs+10 V Vcc I O = 12mA Vs 9 Vs 10 V Switching frequency 25 khz Ripple voltage I O = ± 12mA 75 mvp-p PowerAmp Design PAD132 POWER SUPPLY ACCESSORY MODULE NOTES: 1. Unless otherwise noted: T C =25 O C Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

222 POWER SUPPLY ACCESSORY MODULE PAD132 OPERATING CONSIDERATIONS POWER SUPPLY INPUTS The PAD132 is normally powered by the same voltages used to power the host amplifier. The PAD132 has its own input and output filter capacitors and so no additional bypassing is necessary. A current input ripple can be observed approximately twice the output load current at a duty cycle of 50%. The PAD132 can be operated from a single power supply voltage, for example, zero (ground) and +200V. In this case the output voltages will be approximately -9V and +209V. OUTPUT VOLTAGES The PAD132 output voltages are approximately 9V greater than the input power supply voltages. These voltages are tied to the ±Vcc inputs for the host operational amplifier (see Fig. 2) on page 2. The output voltages have some ripple at approximately 25 khz. The host amplifier s power supply rejection is able to reject most of the ripple amplitude but about 1 mvp-p (RTI) of residual ripple may be found at the output of the amplifier. The ripple can be reduced by adding external filter capacitors, but this is usually unnecessary. PowerAmp Design PAD132 POWER SUPPLY ACCESSORY MODULE 4

223 POWER SUPPLY ACCESSORY MODULE PAD132 PERFORMANCE GRAPHS +VCC OUTPUT RIPPLE -VCC OUTPUT RIPPLE The oscilloscope display at the right shows the PAD132 -Vcc output voltage ripple. The ripple can be reduced by adding an external filtering capacitor, but the amplifier rejects a large portion of this ripple. See below. PAD119 OUTPUT VOLTAGE RIPPLE DUE TO PAD132 OUTPUT RIPPLE, G=10 The oscilloscope display at the left shows the PAD132 +Vcc output voltage ripple. The ripple can be reduced by adding an external filtering capacitor, but the amplifier rejects a large portion of this ripple. AMPLIFIER OUTPUT RIPPLE WITH PAD132 POWER SUPPLY The oscilloscope display at the left shows the PAD119 amplifier output voltage ripple due to the PAD132 power supply ripple with the amplifier in a gain of 10. The ripple is about 10mVp-p in a gain of 10. Referred to the input the ripple is about 1mVp-p. The ripple can be reduced by adding external filtering capacitors, but the amplifier rejects a large portion of this ripple as can be seen by comparing this amplifier output ripple to the power supply output ripple as seen in the oscilloscope displays above. PowerAmp Design PAD132 POWER SUPPLY ACCESSORY MODULE 5

224 POWER SUPPLY ACCESSORY MODULE PAD132 DIMENSIONAL INFORMATION PowerAmp Design PAD132 POWER SUPPLY ACCESSORY MODULE 6

225 PowerAmp Design CAGE JACK STRIP ACCESSORY COMPONENT CJS01 Rev B KEY FEATURES SINGLE STRIP OF 32 CAGE JACKS EASILY CUT TO LENGTH EASY CAGE INSERTION INTO PCB APPLICATIONS EVALUATION BOARDS MOTHER BOARD ASSEMBLY DESCRIPTION The CJS01 is the same cage jack accessory strip supplied in Power Amp Design evaluation kits like the EVAL117. The 32 cage jack strip simplifies the insertion of the cage jacks into the PCB. The strip can be cut to size easily with wire cutters. The left-over carrier strip can be used as a socket for small leaded components similar to ¼ watt resistors, small capacitors and ICs or transistors. The CJS01 is assembled by Power Amp Design and uses components manufactured by Mill-Max. The CJS01 is on a 0.1 pitch. The cage jacks allow for easy insertion and extraction of the amplifier and provide strain relief on the amplifier s pins. The socket 6 finger contacts are 30µ gold plated. Please refer to the Mill-Max part number for further information. PowerAmp Design CJS01 CAGE JACK STRIP ACCESSORY COMPONENT

226 Power Amp Design Evaluation Kits

227 PowerAmp Design EVALUATION KIT FOR PAD20 EVAL20 Rev A INTRODUCTION The EVAL20 evaluation kit provides a convenient method to become familiar with the operation of the PAD20 operational amplifier before your application circuit is committed to production. Some assembly is required since user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Fold-over current limit components are not provided since each application will have different requirements. Connections are also provided for diode clamps on each power supply and the output for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. Sockets are also provided for the optional PAD125 Current Limit Accessory Module as well as the PAD131 Fan Controller Accessory Module. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. Note that some heavy PCB copper planes and some heavy component leads are soldered in this kit. This may require a larger soldering iron tip and/or higher soldering iron temperatures than might normally be used. These steps are marked with an asterisk (*). 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used in the assembly of this kit. The carrier strips left over from the assembly have been included with the kit and can be cut to length and used as sockets for the components you will use to complete your application circuit. You can solder these sockets at the input locations for the PAD20 and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL20 on page 4. Install the required jumpers at the locations indicated depending on the option you have chosen. Jumpers of various lengths are included in this kit. Refer to the Assembled EVAL20 with PAD20 installed. Optional PAD131 and PAD125 also installed. datasheet for the PAD20 for complete information on current limit options. Jumpers for option 1 are already installed. Remove and replace the jumpers as needed for the option you have chosen. 4.* Six current limiting sense resistors, R S, are provided, Two 0.47 Ω, one 1.0 Ω and one 2.0 Ω are useful for the built-in current limit circuit. The 30mΩ and 50mΩ resistors are useful for the external PAD125 current limit circuit. There are four locations on the PCB for these resistors. The PCB ties all four of the locations in parallel. The resistors can be used individually at any location or several can be used to fine tune the final value desired. See the datasheet for the PAD20 and PAD125 to determine the best value for your application. Solder the resistor(s) from the CIRCUIT SIDE of the PCB. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. 6. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 standoffs and screws (not supplied) attached to the PCB at the four corners of the PCB. Option 2- Bench-top mount. Use the rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to a 35mm DIN rail. For mounting the PCB to a DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. PowerAmp Design EVAL20 EVALUATION KIT FOR PAD20

228 EVALUATION KIT FOR MODEL PAD20 EVAL20 ASSEMBLY STEPS CONTINUED 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the datasheet of the amplifier model to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the amplifier. 9. Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + and the black or blue wire into the jack marked at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. Do not solder the fan wires into the PCB. 12. Use the bread-boarding area to add the external components necessary to program the amplifier gain and other circuit requirements to evaluate your application circuit. You can use the evaluation kit schematic and PCB views to map out your circuit. 13. Remember that the amplifier must be compensated to operate correctly. See the amplifier datasheet on Page 4, under PHASE COMPENSATION. The selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470pF capacitor has already been installed in your kit. Another value may better suit your application. Remove and replace the capacitor as necessary for your application. 47pF, 68pF and 220pF capacitors are also included with the kit. C C must be rated for at least 200V. A temperature stable type capacitor is required an X7R ceramic, for example, or NPO (COG) type. 14. If you have chosen to use the PAD125 Current Limit Accessory module and/or the PAD131 Fan Controller Accessory Module install them at this time making sure that pin 1 on each module is aligned with the pin 1 marking on the PCB. Note that the PCB location for the PAD125 may be marked as PAD123 as the PAD125 replaces the PAD123. Additional programming of the PAD125 will be necessary. See the PAD125 datasheet for full details. 15. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 16. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL20 EVALUATION KIT FOR MODEL PAD20 2

229 EVAL20 EVALUATION KIT FOR PAD20 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD20, PAD125, PAD131 are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1,2 2 C3,4 2 1 Cage Jacks w/carrier strip 32 wide Chip Capacitor, 1µF Electrolytic Capacitor, 150µF, 200V Power Amp Design Novacap Panasonic/Digi-Key NA 1825B105K201N ECOS2DP151BA JP1 1 BNC Jack AMP/Digi-Key JP2,3 2 Terminal Block Phoenix/Digi-Key Cc 1 Cc 1 Cc 1 Cc 1 Capacitor, 470pF 200V Capacitor, 220pF 200V Capacitor, 68pF 200V Capacitor, 47pF 200V R S 6 Sense Resistor D4, 6 2 Diode, Fast Recovery AVX/Mouser AVX/Mouser Cornell Dubilier/Mouser Cornell Dubilier/Mouser Xicon/Mouser Xicon/Mouser Xicon/Mouser Vishay/Mouser Vishay/Mouser ON Semi/Digi-Key CK05BX471KTR1 CK05BX221KTR1 CK05BX680K CK05BX470K (2) RC (0.47Ω) RC (1.0Ω) RC (2.0Ω) LVR01R0300FB12 (30mΩ) LVR01R0500FB12 (50mΩ) MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) NA 1 Nut Starter Menda/Jensen Tool 200 NA 2 35mm DIN Rail Adaptor Scidyne PowerAmp Design EVAL20 EVALUATION KIT FOR PAD20 NA 1 PCB Power Amp Design EVAL20 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

230 EVALUATION KIT FOR PAD20 EVAL20 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION Option 1: To use the PAD20 alone without fold-over current limit insert jumpers J1, 3, 7, 10 only (jumpers pre-installed for this option). Option 2: To use the PAD20 alone with fold-over current limit use jumpers J1, 2, 3 only. Option 3: To use the PAD20 and PAD125 together without fold-over current limit insert jumpers J4, 6, 7, 8, 9, 10, 11 only. Option 4: To use the PAD20 and PAD125 together with fold-over current limit insert jumpers J4, 5, 6, 7, 8, 9 only. Refer to the PAD Power Excel spreadsheet (available for download from the website) for assistance in calculating resistor values for fold-over current limiting. PowerAmp Design EVAL20 EVALUATION KIT FOR PAD20 4

231 EVALUATION KIT EVAL20 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL20 EVALUATION KIT FOR MODEL PAD20 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 5

232 EVALUATION KIT FOR PAD20 EVAL20 ASSEMBLED KIT ASSEMBLED EVAL20 WITH OPTIONAL PAD131 AND PAD125 MODULES PowerAmp Design EVAL20 EVALUATION KIT FOR PAD20 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

233 EVALUATION KIT FOR PAD20 EVAL20 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS Vs OUT GND CC2 CC1 Vs TMP SD IL +IL IC AC SUB +IN IN PowerAmp Design EVAL20 EVALUATION KIT FOR PAD20 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

234 PowerAmp Design EVALUATION KIT FOR MODELS PAD112/ PAD113 EVAL112 Rev H INTRODUCTION The EVAL112 evaluation kit provides a convenient method to become familiar with the operation of amplifier models PAD112 and PAD113 before your application circuit is committed to production. Some assembly is required since user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Fold-over current limit components are not provided since each application will have different requirements. Connections are also provided for diode clamps on each power supply and the output for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. Sockets are also provided for the optional PAD123 or PAD125 Current Limit Accessory Modules as well as the PAD131 Fan Controller Accessory Module. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. Note that some heavy PCB copper planes and some heavy component leads are soldered in this kit. This may require a larger soldering iron tip and/or higher soldering iron temperatures than might normally be used. These steps are marked with an asterisk (*). 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with the assembled version of this evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be cut to length and used as sockets for the components you will use to complete your application circuit. You can solder these sockets at the input locations for the amplifier and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL112 on page 4. Install the required jumpers at the locations indicated depending on the option you have chosen. Jumpers of various lengths are included in this kit. Refer to the Assembled EVAL112 with amplifier installed. Optional accessory modules also installed. Optional 35mm DIN rail mounting shown. datasheet for the amplifier for complete information on current limit options. Jumpers for option 1 are already installed. Remove and replace the jumpers as needed for the option you have chosen. 4.* Four current limiting sense resistors, R S, are provided; two 0.47 Ω, one 1.0 Ω and one 2.0 Ω. Likewise, there are four locations on the PCB for these resistors. The PCB ties all four of the locations in parallel. The resistors can be used individually at any location or several can be used to fine tune the final value desired. See the datasheet for the amplifier to determine the best value for your application. Solder the resistor(s) from the CIRCUIT SIDE of the PCB. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. 6. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 standoffs and screws (not supplied) attached to the PCB at the four corners of the PCB. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to a 35mm DIN rail. For mounting the PCB to a DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113

235 EVALUATION KIT FOR MODELS PAD112/ PAD113 EVAL112 ASSEMBLY STEPS CONTINUED 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the datasheet of the amplifier model to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the amplifier. 9. Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + at the location marked FAN on the PCB. Likewise insert the blue or black wire into the cage jack labeled at the location marked FAN. Do not solder the wires into the sockets. 12. Use the bread-boarding area to add the external components necessary to program the amplifier gain and other circuit requirements to evaluate your application circuit. You can use the evaluation kit schematic and PCB views to map out your circuit. 13. Remember that the amplifier must be compensated to operate correctly. See the amplifier datasheet on Page 4, under PHASE COMPENSATION. The selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470pF capacitor has already been installed in your kit. Another value may better suit your application. Remove and replace the capacitor as necessary for your application. 10pF, 33pF and 100pF capacitors are also included with the kit. C C must be rated for at least 500V. A temperature stable type capacitor is required an X7R ceramic, for example, or an NPO type. 14. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 15. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113 2

236 EVAL112 EVALUATION KIT FOR MODELS PAD112/ PAD113 ILLUSTRATED PARTS LIST Note that the amplifier and accessory modules are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1, 2 2 C3, Cage Jacks w/carrier strip 32 wide Chip Capacitor,.2µF, 500V Electrolytic Capacitor, 47µF, 500V Power Amp Design Novacap Panasonic/Digi-Key NA 1825B204M501NT ECOS2HP470BA JP1 1 BNC Jack AMP/Digi-Key C5,6 2 Electrolytic Capacitor, 47µF 35V Panasonic/Digi-Key EEU-FC1V470 JP2,3 2 Terminal Block Phoenix/Digi-Key Cc 1 Cc 1 Cc 1 Cc 1 Capacitor, 470pF 1kV Capacitor, 100pF 1kV Capacitor, 33pF 1kV Capacitor, 10pF 1kV R S 4 Sense Resistor D4, 6 2 Diode, Fast Recovery Vishay/Mouser Vishay/Mouser Vishay/Mouser Vishay/Mouser Xicon/Mouser Xicon/Mouser Xicon/Mouser ON Semi/Digi-Key 562R10TST47 562R10TST10 561R10TCCQ33 561R10TCCQ10 (2) RC (0.47Ω) RC (1.0Ω) RC (2.0Ω) MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) NA 1 Nut Starter Menda/Jensen Tool 200 NA 2 35mm DIN Rail Adaptor Scidyne NA 1 PCB Power Amp Design EVAL112 R-C NA PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

237 EVALUATION KIT FOR MODELS PAD112/ 113 EVAL112 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION Option 1: To use the amplifier alone without fold-over current limit insert jumpers J1, 3, 7, 10 only (jumpers pre-installed for this option). Option 2: To use the amplifier alone with fold-over current limit use jumpers J1, 2, 3 only. Option 3: To use the amplifier and current limit module together without fold-over current limit insert jumpers J4, 6,7, 8, 9, 10, 11 only. Option 4: To use the amplifier and current limit module together with fold-over current limit insert jumpers J4, 5, 6, 7, 8, 9 only. Refer to the PAD Power Excel spreadsheet (available for download from the website) for assistance in calculating resistor values for fold-over current limiting. PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113 4

238 EVALUATION KIT EVAL112 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 5

239 EVALUATION KIT FOR MODELS PAD112/ PAD113 EVAL112 ASSEMBLED KIT ASSEMBLED EVAL112 WITH AMPLIFIER AND ACCESSORY MODULES MOUNTED AND 35mm DIN RAIL PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

240 EVALUATION KIT FOR MODELS PAD112/ PAD113 EVAL112 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL112 EVALUATION KIT FOR MODELS PAD112/ 113 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

241 PowerAmp Design EVALUATION KIT FOR PAD116/117 EVAL117 Rev K INTRODUCTION The EVAL117 evaluation kit provides a convenient method to become familiar with the operation of the PAD116 or PAD117 operational amplifiers before your application circuit is committed to production. Some assembly is required since user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Fold-over current limit components are not provided since each application will have different requirements. Connections are also provided for diode clamps on each power supply and the output for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. Note that some heavy PCB copper planes and some heavy component leads are soldered in this kit. This may require a larger soldering iron tip and/or higher soldering iron temperatures than might normally be used. These steps are marked with an asterisk (*). Note that PCB is marked for the PAD117 but is also used for the PAD Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with the assembled kit. The carrier strips left over from the assembly have been included with the kit and can be used as sockets for the components you will use to complete your application circuit. If desired you can cut and solder these sockets at the input locations for the PAD116/117, PAD121 and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL116/117 on page 4. Read all the options for the jumpers you will need installed or removed. Note that the kit comes wired with option 1. Install or remove jumpers as required at the locations indicated depending on the option Assembled EVAL117 with PAD116/117 mounted. Shown with optional PAD121, PAD131 and DIN rail mounting. you have chosen. Refer to the data sheet for the PAD121 for complete information on current limit options 4.* This step may require a soldering temperature higher than normal and/or a larger soldering iron tip. Four current limiting sense resistors, R S, are provided; one 0.01 Ω, one Ω (use one of these two with PAD121), one 0.05 Ω and one 0.10 Ω. Refer to the data sheets for the PAD116/117 and PAD121 to determine which resistor value best fits your application. Smear a small amount of heat sink grease on the back of the selected resistor and then attach the resistor loosely to heat sink HS1 at R S with a 4-40 X ½ screw and nut. The plastic nut driver supplied with this kit will help here. Tighten the 4-40 resistor mounting hardware. Solder the resistor from the CIRCUIT SIDE of the PCB making sure that the holes are completely filled with solder. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. 6. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 x 1/4 M/F hex standoffs, and #6 nut (neither supplied) attached to the PCB at the four corners and center of the PCB and the chassis. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to either 1 or 2 DIN rails. For mounting the PCB to one DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117

242 EVALUATION KIT FOR PAD116/117 EVAL117 ASSEMBLY STEPS CONTINUED of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. If mounting to 2 DIN rails is desired, mount DIN rail adaptors at locations 3, 4, 5 and 6 in a similar manner. The center to center dimension of the DIN rails is to be 2.00 [50.8mm]. 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the data sheet of the PAD116/117 to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the PAD116/ Align the 4 studs of the mounting standoffs with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with the pin 1 marking on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. Strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + and the black or blue wire into the jack marked at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. Do not solder the fan wires into the PCB. 12. Add components as necessary to evaluate your application circuit. You can utilize the evaluation kit schematic and PCB views to map out your circuit and components. Remember, if you are using the PAD121 Current Limit Accessory Module additional components or jumpers will be needed to program the operation of the module. See the PAD121 data sheet. 13. Remember that the PAD116/117 must be compensated to operate correctly. See the PAD116/117 datasheet on Page 4, under PHASE COMPENSATION. The selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470pF capacitor has already been installed in your kit. Another value may better suit your application. Remove and replace the capacitor as necessary for your application. A 100pF capacitor is also included with the kit. C C must be rated for at least 100V. A temperature stable type capacitor is required an X7R ceramic, for example, or an NPO type. 14. If you have chosen to use the PAD121 accessory module install it at this time making sure that pin 1 on the module is aligned with the pin 1 marking on the PCB. 15. If you have chosen to use the PAD131 Fan Controller Accessory Module install it at this time making sure that pin 1 on the module is aligned with the pin 1 marking on the PCB. Double check that the wires from the fan are inserted into the jacks marked Fan Control. 16. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed or removed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 17. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117 2

243 EVAL117 EVALUATION KIT FOR PAD116/117 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD116/117, PAD121 and PAD131 are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1, 2 2 C3, 4 2 C5,6 2 C C 1 Cc 1 3 Cage Jacks w/carrier strip 32 wide Chip Capacitor, 1µF Electrolytic Capacitor, 470µF 100V Electrolytic Capacitor, 47µF 35V Capacitor, 100pF 200V Capacitor, 470pF 200V Power Amp Design Novacap Panasonic/Digi-Key Panasonic/Digi-Key Kemet/Mouser Kemet/Mouser NA 1825B105K201N ECO-S2AA471BA EEU-FC1V470 C322C101J2G5HA C317C471J2G5CA JP1 1 BNC Jack AMP/Digi-Key JP2 1 Terminal Block Phoenix/Digi-Key TS1 1 Terminal Strip Molex/Newark R S 4 Sense Resistor D4, 6 2 Diode, Fast Recovery Isotek Isotek Isotek Isotek ON Semi/Digi-Key PBV-R (50mΩ) PBV-R (100mΩ) PBV-R (10mΩ) PBV-R (15 mω) MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 HS1 1 Heat Sink Wakefield/Mouser 67720ABP NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) NA 1 Nut Starter Menda/Jensen Tool 200 NA 1 Heak Sink Grease NTE/Jameco NTE303 NA X1/2 screw & 4-40 nut NA NA PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117 NA 4 35mm DIN Rail Adaptor Scidyne NA 1 PCB Power Amp Design EVAL117 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

244 EVALUATION KIT FOR PAD116/117 EVAL117 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION Option 1: To use the PAD116/117 without fold-over current limit insert jumpers J1, 3, 7, 10 only (jumpers pre-installed for this option). Option 2: To use the PAD116/117 with fold-over current limit insert jumpers J1, 2, 3 only. Option 3: To use the PAD116/117 and PAD121 together without fold-over current limit insert jumpers J4, 6, 7, 8, 9, 10, 11 only. Option 4: To use the PAD116/117 and PAD121 together with fold-over current limit insert jumpers J4, 5, 6, 7, 8, 9 only. Refer to the PAD Power Excel spreadsheet (available for download from the website) for assistance in calculating resistor values for fold-over current limiting. PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117 4

245 EVALUATION KIT FOR PAD116/117 EVAL117 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117 5

246 EVALUATION KIT FOR PAD116/117 EVAL117 ASSEMBLED KIT Assembled EVAL117 with optional DIN rail PCB mounting and PAD117 installed. Optional PAD121 and PAD131 accessory modules are also shown. PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

247 EVALUATION KIT FOR PAD116/117 EVAL117 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL117 EVALUATION KIT FOR PAD116/117 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

248 PowerAmp Design EVALUATION KIT FOR MODELS PAD115/ PAD118/ PAD119 EVAL118 Rev G INTRODUCTION The EVAL118 assembled evaluation kit provides a convenient method to become familiar with the operation of the operational amplifier models PAD115, PAD118 and PAD119 before your application circuit is committed to production. Some assembly is required since some user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Connections are also provided for implementing fold-over current limit as well as standard current limit with the optional PAD125 Current Limit Accessory Module. Fold-over current limit components are not provided since each application will have different requirements. Diode clamps on each power supply and the output connections are provided for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in each assembly step. Note that some heavy PCB copper planes and some heavy component leads are soldered in this kit. This may require a larger soldering iron tip and/or higher soldering iron temperatures than might normally be used. These steps are marked with an asterisk (*). Notice that the PCB for this kit is marked for the PAD118 amplifier but is also compatible with models PAD115 and PAD119. Also, the PCB may be marked for the PAD121 Current Limit Accessory Module but is compatible with the PAD125 accessory module also. 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with the assembled version of this evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be used as sockets for the components you will use to complete your application circuit. If desired you can cut and solder these sockets at the Assembled EVAL118 with amplifier mounted. Optional accessory also modules shown. input locations for the amplifier and current limit accessory module as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL118 on page 4. Install the required jumpers at the locations indicated depending on the options you have chosen. Note that the kit comes already wired for Option 1. Remove and insert jumpers as needed for the option you have chosen. Refer to the datasheet for the PAD125 for complete information on current limit options. *4. This step may require a soldering temperature higher than normal and/or a larger soldering iron tip. Three current limiting sense resistors, R S, are provided; one Ω, one Ω and one Ω. Refer to the data sheet for the PAD125 to determine which resistor value best fits your application (if you have chosen not to use the current limit accessory module select the Ω resistor or install a length of heavy buss wire into the outer two holes at the location for the sense resistor R S ). Smear a small amount of heat sink grease on the back of the selected resistor and then attach the resistor to heat sink HS1 at R S with a 4-40 X ½ screw and nut. The plastic nut driver supplied with this kit will help here. Tighten the 4-40 resistor mounting hardware. Solder the resistor from the CIRCUIT SIDE of the PCB making sure that the holes are completely filled with solder. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. 6. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 x 1/4 M/F hex standoffs, and #6 nut (neither supplied) attached to the PCB at the four corners and center of the PCB and the chassis. PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119

249 EVAL118 EVALUATION KIT FOR MODELS PAD115/ PAD118/ PAD119 ASSEMBLY STEPS CONTINUED Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to either 1 or 2 DIN rails. For mounting the PCB to one DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. If mounting to 2 DIN rails is desired, mount DIN rail adaptors at locations 3, 4, 5 and 6 in a similar manner. The center to center dimension of the DIN rails is to be 2.00 [50.8mm]. 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the datasheet of the amplifier to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the amplifier. 9. Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + at the location marked FAN on the PCB. Likewise insert the blue or black wire into the cage jack labeled at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. Do not solder the fan wires into the PCB. 12. Add components as necessary to evaluate your application circuit. You can utilize the evaluation kit schematic and PCB views to map out your circuit and components. Remember, if you are using the PAD125 Current Limit Accessory Module additional components or jumpers will be needed to program the operation of the module. See the PAD125 Current Limit Accessory Module datasheet. 13. Remember that the amplifier must be compensated to operate correctly. See the amplifier datasheet on Page 4 under PHASE COMPENSATION. Your selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470pF capacitor has already been installed in the evaluation kit. Additionally, a 100pF compensation capacitor is also included in the kit. Replace C C as necessary for your application but keep in mind that C C must be rated for at least 300VDC. A temperature stable capacitor is required such as an NPO or X7R type. 14. If you have chosen to use the PAD125 accessory module install it at this time making sure that pin 1 on the module is aligned with the pin 1 marking on the PCB. 15. If you have chosen to use the PAD131 Fan Controller Accessory Module install it at this time making sure that pin 1 on the module is aligned with the pin 1 marking on the PCB. Double check that the wires from the fan are inserted into the jacks marked Fan Control. 16. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 17. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119 2

250 EVAL118 EVALUATION KIT FOR MODELS PAD115/ PAD118/ PAD119 ILLUSTRATED PARTS LIST Note that the amplifier and accessory modules are purchased separately Ref Qty Description Mfg/Distributor Amplifier Pins TPs C1, 2 2 C3, 4 2 C5,6 2 3 Cage Jacks w/carrier strip 32 wide Chip Capacitor, 0.2uF, 500V Electrolytic Capacitor, 330uF, 350V Electrolytic Capacitor, 47µF 35V Power Amp Design Novacap Panasonic/Digi-Key Panasonic/Digi-Key Mfg. Part Number NA 1825B204M501NT EET-HC2V331HF EEU-FC1V470 JP1 1 BNC Jack AMP/Digi-Key Cc 1 Cc 1 Capacitor, 470pF, 1kV Capacitor, 100pF, 1kV Vishay/Mouser Vishay/Mouser 562R10TST47 562R10TST10 JP2 1 Terminal Block Phoenix/Digi-Key TS1 1 Terminal Strip Molex/Newark R S 3 Sense Resistor D4, 6 2 Diode, Fast Recovery Isotek Isotek Isotek ON Semi/Digi-Key PBV-R (5mΩ) PBV-R (10mΩ) PBV-R (15 mω) MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 HS1 1 Heat Sink Wakefield/Mouser 67720ABP NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) NA 1 Nut Starter Menda/Jensen Tool 200 NA 1 Heak Sink Grease NTE/Jameco NTE303 NA X1/2 screw & 4-40 nut NA NA NA 4 35mm DIN Rail Adaptor Scidyne Illustration (not to scale) PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119 NA 1 PCB Power Amp Design EVAL118 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

251 EVALUATION KIT FOR MODELS PAD115/ PAD118/ PAD119 EVAL118 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION Option 1: To use the amplifier and current limit accessory module together without fold-over current limit insert jumpers J1, 3. The kit comes wired with this option already installed. Option 2: To use the amplifier and current limit accessory module together with fold-over current limit insert jumper J2. Refer to the PAD Power Excel spreadsheet (available for download from the website) for assistance in calculating resistor values for fold-over current limiting. PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119 4

252 EVALUATION KIT EVAL118 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119 5

253 EVALUATION KIT FOR MODELS PAD115/ PAD118/ PAD119 EVAL118 ASSEMBLED KIT VIEWS Assembled EVAL118 with amplifier and optional accessory modules installed PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

254 EVAL118 EVALUATION KIT FOR MODELS PAD115/ PAD118/ PAD119 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL118 EVALUATION KIT FOR MODELS PAD115/ 118/ 119 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

255 PowerAmp Design EVALUATION KIT FOR PAD126 EVAL126 Rev C INTRODUCTION The EVAL126 assembled evaluation kit provides a convenient method to become familiar with the operation of the PAD126 operational amplifier before your application circuit is committed to production. Some assembly is required since some user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Connections are also provided for implementing fold-over current limit as well as standard current limit with the optional PAD125 Current Limit Accessory Module. Fold-over current limit components are not provided since each application will have different requirements. Support is also provided for the PAD131 Fan Controller Accessory Module. Diode clamps on each power supply and the output connections are provided for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in each assembly step. Some steps may require a soldering temperature higher than normal and/or a larger soldering iron tip. These steps are marked with an *. 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with the assembled version of this evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be used as sockets for the components you will use to complete your application circuit. If desired you can cut and solder these sockets at the input locations for the PAD126 and PAD125 and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL126 on page 4. Install the required jumpers at the locations indicated depending on the options you have chosen. Jumpers for option 1 have already been installed. Remove and Assembled EVAL126 with PAD126 mounted. replace the jumpers as necessary for the options you have chosen. If you plan to use the optional PAD125 Currrent Limit Accessory Module refer to the data sheet for the PAD125 for complete information on how to program the operation of the PAD * This step may require a soldering temperature higher than normal and/or a larger soldering iron tip. Four current limiting sense resistors, R S, are provided; one 0.015Ω, one 0.025Ω, one 0.050Ω and one 0.100Ω. Refer to the data sheets for the PAD125 and PAD126 to determine which resistor value best fits your application. Smear a small amount of heat sink grease on the back of the selected resistor and then attach the resistor to heat sink HS1 at R S with a 4-40 X ½ screw and nut. The plastic nut driver supplied with this kit will help here. Tighten the 4-40 resistor mounting hardware. Solder the resistor from the CIRCUIT SIDE of the PCB making sure that the holes are completely filled with solder. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. 6. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 x 1/4 M/F hex standoffs, #6 X ¼ screw and #6 nut (not supplied) attached to the PCB at the four corners of the PCB and the chassis. Use one of the rubber bumpers supplied at the indicated place at the center of the amplifier on the CIRCUIT SIDE of the PCB. PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126

256 EVALUATION KIT FOR PAD126 Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to either 1 or 2 DIN rails. For mounting the PCB to one DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. If mounting to 2 DIN rails is desired, mount DIN rail adaptors at locations 3, 4, 5 and 6 in a similar manner. The center to center dimension of the DIN rails is to be 2.00 [50.8mm]. 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the data sheet of the PAD126 to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the PAD Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. If necessary, strip 1/8 of insulation from the wires connected to the fan twist and tin the wire ends. Insert the red wire into the cage jack labeled + and the black or blue wire into the jack marked at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. 12. Add components as necessary to evaluate your application circuit. You can utilize the evaluation kit schematic and PCB views to map out your circuit and components. Remember, if you are using the PAD125 Current Limit Accessory Module additional components will be needed to program the operation of the module. See the PAD125 data sheet. 13. The PAD126 must be compensated to operate correctly. See EXTERNAL CONNECTIONS DIAGRAM on page 2 of the datasheet for the PAD126. A table is provided relating the required compensation capacitor value for various circuit gains. Your selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 100pF compensation capacitor has already been installed in the kit, but this value may not be the best value for your application. 33pF and 470pF capacitors are also provided. Remove and replace the capacitor EVAL126 ASSEMBLY STEPS CONTINUED as necessary. The compensation capacitor must be rated for the total supply voltage (500V) and be temperature stable (X7R or NPO). 14. If you have chosen to use the PAD125 and/or PAD131 accessory module(s) install the module(s) at this time making sure that pin 1 of each module is aligned with the pin 1 markings on the PCB. 15. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 16. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126 2

257 EVAL126 EVALUATION KIT FOR PAD126 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD126, PAD131 and PAD125 are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs 3 Cage Jacks w/carrier strip 32 wide Power Amp Design NA C1,2,7,8 4 C3, 4 2 C5,6 2 C C 1 C C 1 C C 1 Chip Capacitor, 0.20uF, 500V 500V Electrolytic Capacitor, 150uF 35V Electrolytic Capacitor, 47uF Ceramic Capacitor, 470pF, 1kV Ceramic Capacitor, 100pF, 1kV Ceramic Capacitor, 33pF, 1kV Novacap Panasonic/Digi-Key Panasonic/Digi-Key Sprague/Mouser Sprague/Mouser Sprague/Mouser 1825B204M501NT ECOS2HP151CA EEU-FC1V R5GAT47 562R5GAT10 561R10TCCQ33 JP1 1 BNC Jack AMP/Digi-Key JP2 1 Terminal Block Phoenix/Digi-Key TS1 1 Terminal Strip Molex/Newark R S 4 Sense Resistor D4, 6 2 Diode, Fast Recovery Isotek Isotek Isotek Isotek ON Semi/Digi-Key PBV-R (50mΩ) PBV-R (100mΩ) PBV-R (15mΩ) PBV-R (25 mω) MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) HS1 1 Heat Sink Wakefield/Mouser 67725ABP NA 1 Nut Starter Menda/Jensen Tool 200 NA 1 Heak Sink Grease NTE/Jameco NTE303 NA X1/2 screw & 4-40 nut NA NA PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126 NA 4 35mm DIN Rail Adaptor Scidyne NA 1 PCB Power Amp Design EVAL126 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

258 EVALUATION KIT FOR PAD126 EVAL126 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION Option 1: To use the PAD126 without fold-over current limit insert jumpers J1, 3, 7, 10. The kit comes with jumpers for this option already installed. Option 2: To use the PAD126 with fold-over current limit insert jumpers J1, 2, 3. Option 3: To use the PAD126 and PAD125 together without fold-over current limit insert jumpers J4, 6, 7, 8, 9, 10, 11. Option 4: To use the PAD126 and PAD125 together with fold-over current limit insert jumpers J4, 5, 6, 7, 8, 9. PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126 4

259 EVALUATION KIT EVAL126 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126 5

260 EVALUATION KIT FOR PAD126 EVAL126 ASSEMBLED KIT EVAL126 with PAD126 mounted and also optional accessory modules PAD125 and PAD131 installed PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

261 EVALUATION KIT FOR PAD126 EVAL126 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL126 EVALUATION KIT FOR PAD126 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

262 PowerAmp Design EVALUATION KIT FOR PAD127 EVAL127 Rev E INTRODUCTION The EVAL127 assembled evaluation kit provides a convenient method to become familiar with the operation of the PAD127 operational amplifier before your application circuit is committed to production. Some assembly is required since some user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. The amplifier and accessory modules are purchased separately. Critical connections for power supply bypassing and compensation are pre-wired. Connections are also provided for implementing fold-over current limit as well as standard current limit with the optional PAD125 Current Limit Accessory Module. Fold-over current limit components are not provided since each application will have different requirements. Diode clamps on each power supply and the output connections are provided for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in each assembly step. Some steps may require a soldering temperature higher than normal and/or a larger soldering iron tip. These steps are marked with an *. 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT SIDE. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with the assembled version of this evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be used as sockets for the components you will use to complete your application circuit. If desired you can cut and solder these sockets at the input locations for the PAD127 and PAD125 (the PCB may be marked as PAD121) and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL127 on page 4. Install the required jumpers at the locations indicated depending on the options you have chosen. Refer to the data sheet for the PAD125 for complete information on current limit options. Assembled EVAL127 with PAD127 mounted. Optional PAD125 and PAD131 also shown. 4.* This step may require a soldering temperature higher than normal and/or a larger soldering iron tip. Four current limiting sense resistors, R S, are provided; one 0.005Ω, one 0.010Ω, one 0.050Ω and one 0.100Ω. Refer to the datasheets for the PAD127 and PAD125 to determine which resistor value best fits your application. Smear a small amount of heat sink grease on the back of the selected resistor and then attach the resistor to the heat sink HS1 at R S with a 4-40 X ½ screw and nut. The plastic nut driver supplied with this kit will help here. Tighten the 4-40 resistor mounting hardware. Solder the resistor from the CIRCUIT SIDE of the PCB making sure that the holes are completely filled with solder. 5.* Refer the page 5 of the datasheet for the PAD127 to select a value for the six degeneration resistors R D 1-R D 6. Values supplied with this kit are listed in the illustrated parts list. Install R D 1-R D 6 from the CIRCUIT SIDE of the PCB, leaving a small gap between the body of the resistors and the circuit board, and solder from the DUT SIDE of the PCB,. Cut off the excess resistor lead lengths. Make doubly sure that all the degeneration resistors are the same value and the proper value for your application. 6. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127

263 EVALUATION KIT FOR PAD127 EVAL127 ASSEMBLY STEPS CONTINUED 7. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 x 1/4 M/F hex standoffs, #6 X ¼ screw and #6 nut (not supplied) attached to the PCB at the four corners of the PCB and the chassis. Use one of the rubber bumpers supplied at the indicated place at the center of the amplifier on the CIRCUIT SIDE of the PCB. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted on two DIN rails. Press the plastic DIN rail adaptors into the PCB in the holes at the edges of the PCB at locations 1through 4 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. The center to center dimension of the DIN rails is to be 4.30 [109.2mm]. 8. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the data sheet of the PAD127 to find out how to apply circuits that require these components. 9. Remove the 4 hex nuts from the mounting spacers of the PAD Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 11. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 12. Strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends (this may already be done). Insert the red wire into the cage jack labeled + and the black or blue wire into the jack marked at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. Do not solder the fan wires into the sockets. 13. Add components as necessary to evaluate your application circuit. You can utilize the evaluation kit schematic and PCB views to map out your circuit and components. Remember, if you are using the PAD125 (PAD125 replaces the PAD121) Current Limit Accessory Module additional components will be needed to program the operation of the module. See the PAD125 datasheet. 14. The PAD127 must be compensated to operate correctly. See EXTERNAL CONNECTIONS DIAGRAM on page 2 of the datasheet for the PAD127. A table is provided relating the required compensation capacitor value for various circuit gains. Your selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470 pf compensation capacitor has already been installed in the kit, but this value may not be the best value for your application. A 100pF capacitor is also provided. Remove and replace the capacitor as necessary. 15. If you have chosen to use the PAD125 accessory module install it at this time making sure that pin 1 on the module is aligned with the pin 1 marking on the PCB. 16. If you have chosen to use the PAD131 Fan Controller Accessory Module install it at this time making sure that pin 1 on the module is aligned with the pin 1 marking on the PCB. Double check that the wires from the fan are inserted into the jacks marked Fan Control. 17. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 18. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127 2

264 EVAL127 EVALUATION KIT FOR PAD127 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD127, PAD125 and PAD131 are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1, 2 2 C5,6 2 C3, 4 2 C C 1 C C 1 3 Cage Jacks w/carrier strip 32 wide Chip Capacitor, 1uF 35V Electrolytic Capacitor, 47uF 100V Electrolytic Capacitor, 2700uF Ceramic Capacitor, 100pF Ceramic Capacitor, 470pF Power Amp Design Novacap Panasonic/Digi-Key Panasonic/Digi-Key Kemet/Mouser Kemet/Mouser CJS B105K201N EEU-FC1V470 ECOS2HP272CA C322C101J2G5HA C322C471J2G5HA JP1 1 BNC Jack AMP/Digi-Key JP2 1 Terminal Block Phoenix/Digi-Key TS1 1 Terminal Strip Molex/Newark R S 4 Sense Resistor R D 1- R D 6 42 D4, 6 2 Degeneration Resistor, 6 ea., 7 values Diode, Fast Recovery Isotek Isotek Isotek Isotek Vishay/Mouser Vishay/Mouser Vishay/Mouser Vishay/Mouser Vishay/Mouser Vishay/Mouser Vishay/Mouser ON Semi/Digi-Key PBV-R (50mΩ) PBV-R (100mΩ) PBV-R (5mΩ) PBV-R (10 mω) RS02BR3000F (300mΩ) RS02BR2500F (250mΩ) RS02BR2000F (200mΩ) RS02BR1500F (150mΩ) RS02BR1000F (100mΩ) LVR05R0500F(50mΩ) LVR05R0300F (30mΩ) MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 HS1 1 Heat Sink Wakefield/Online Components 67725ABP NA 1 Nut Starter Menda/Jensen Tool 200 NA 1 Heak Sink Grease NTE/Jameco NTE303 NA X1/2 screw & 4-40 nut NA NA NA 4 35mm DIN Rail Adaptor Scidyne NA 1 PCB Power Amp Design EVAL127 NA PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

265 EVALUATION KIT FOR PAD127 EVAL127 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION To use the PAD127 without fold-over current limit insert jumpers J1, 3, 7, 10. To use the PAD127 with fold-over current limit insert jumpers J1, 2, 3. To use the PAD127 and PAD121 together without fold-over current limit insert jumpers J4, 6, 7, 8, 9, 10, 11. To use the PAD127 and PAD121 together with fold-over current limit insert jumpers J4, 5, 6, 7, 8, 9. PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127 4

266 EVALUATION KIT EVAL127 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127 5

267 EVALUATION KIT FOR PAD127 EVAL127 ASSEMBLED KIT EVAL127 with PAD127 installed. Optional PAD121 and PAD131 also shown installed. PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

268 EVALUATION KIT FOR PAD127 EVAL127 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL127 EVALUATION KIT FOR PAD127 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

269 PowerAmp Design EVALUATION KIT FOR MODELS PAD128/ PAD129 EVAL129 Rev E INTRODUCTION The EVAL129 assembled evaluation kit provides a convenient method to become familiar with the operation of the PAD128 and PAD129 operational amplifiers before your application circuit is committed to production. Some assembly is required since some user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Connections are also provided for implementing fold-over current limit as well as standard current limit with the optional PAD125 Current Limit Accessory Module. Fold-over current limit components are not provided since each application will have different requirements. Connections are provided for the optional PAD130 or PAD132 Power Supply Accessory Modules and also the PAD131 Fan Controller Accessory Module. Diode clamps on each power supply and the output connections are provided for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. Note that some heavy PCB copper planes and some heavy component leads are soldered in this kit. This may require a larger soldering iron tip and/or higher soldering iron temperatures than might normally be used. These steps are marked with an asterisk (*). Refer to the Illustrated Parts List for the components mentioned in each assembly step. 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used in the assembly of this evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be used as sockets for the components you will use to complete your application circuit. If desired you can cut and solder these sockets at the input locations for the amplifier, current limit module and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. Assembled EVAL129 with amplifier mounted. Optional accessory modules PAD125, PAD132 and PAD131 also shown. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL129 on page 4. Read all the options for the jumpers you will need installed or removed. Note that the kit comes wired with options 2 and 3. Install or remove jumpers as required at the locations indicated depending on the options you have chosen. Refer to the data sheet for the PAD125 for complete information on current limit options. Refer to the data sheet for the PAD130 or PAD132 for details on its operation and applications. 4.* This step may require a soldering temperature higher than normal and/or a larger soldering iron tip. Three current limiting sense resistors, R S, are provided; one Ω, one Ω and one Ω. Refer to the data sheet for the current limit module to determine which resistor value best fits your application (if you have chosen not to use the current limit module select the Ω resistor or install a length of heavy buss wire into the outer two holes at the location for the sense resistor R S ). Smear a small amount of heat sink grease on the back of the selected resistor and then attach the resistor to heat sink HS1 at R S with a 4-40 X ½ screw and nut. The plastic nut driver supplied with this kit will help here. Tighten the 4-40 resistor mounting hardware. Solder the resistor from the CIRCUIT SIDE of the PCB making sure that the holes are completely filled with solder. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129

270 EVALUATION KIT FOR MODELS PAD128/ PAD129 EVAL129 ASSEMBLY STEPS CONTINUED 6. The evaluation kit PCB can be mounted in several ways: Option 1- Chassis mount. Use #6 x 1/4 M/F hex standoffs, and #6 nut (neither supplied) attached to the PCB at the four corners of the PCB and the chassis. Use another similar standoff at the center area where the amplifier is mounted. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to either 1 or 2 DIN rails. For mounting the PCB to one DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. If mounting to 2 DIN rails is desired, mount DIN rail adaptors at locations 3, 4, 5 and 6 in a similar manner. The center to center dimension of the DIN rails is to be 2.00 [50.8mm]. 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the datasheet of the amplifier to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the amplifier. 9. Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + and the black or blue wire into the jack marked at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. Do not solder the fan wires into the PCB. 12. Add components as necessary to evaluate your application circuit. You can utilize the evaluation kit schematic and PCB views to map out your circuit and components. Remember, if you are using the current limit accessory module additional components or jumpers will be needed to program the operation of the module. See the PAD125 datasheet. 13. The amplifier must be compensated to operate correctly. See the amplifier datasheet on Page 4 under PHASE COMPENSATION. Your selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470pF compensation capacitor has been installed but this may not be the best value for your application. If another value is better remove and replace C C as necessary. The kit also includes and 100pF capacitor. C C must be a 200V rated capacitor and temperature stable, for example an NPO or X7R type. 14. If you have chosen to use the current limit module and/or power supply accessory module and PAD131 fan controller module install them at this time making sure that pin 1 on each module is aligned with the pin 1 marking on the PCB. Note that the PCB location for the PAD125 may be marked as PAD123 as the PAD125 replaces the PAD123. The heat sink tabs on the PAD130 or PAD132 may be soldered to the PCB. 15. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 16. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129 2

271 EVAL129 EVALUATION KIT FOR MODELS PAD128/ PAD129 ILLUSTRATED PARTS LIST Note that amplifier and accessory modules are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1, 2, 5, 6 4 C3, 4 2 C5,6 2 3 Cage Jacks w/carrier strip 32 wide Chip Capacitor, 1µf, 200V Electrolytic Capacitor, 330µF, 200V Electrolytic Capacitor, 47µF 35V Power Amp Design Novacap Panasonic/Digi-Key Panasonic/Digi-Key NA 1825B105K201N EET-ED2D331BA EEU-FC1V470 JP1 1 BNC Jack AMP/Digi-Key Cc 1 Cc 1 Capacitor 100pF 200V Capacitor 470pF 200V Kemet/Mouser Kemet/Mouser C052K101K2X5CA C052K471K2X5CA JP2 1 Terminal Block Phoenix/Digi-Key TS1 1 Terminal Strip Molex/Newark R S 3 Sense Resistor D4, 6 2 Diode, Fast Recovery Isotek Isotek Isotek ON Semi/Digi-Key PBV-R (5mΩ) PBV-R (10mΩ) PBV-R (15 mω) MUR410RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 HS1 1 Heat Sink Wakefield/Mouser 67720ABP NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) NA 1 Nut Starter Menda/Jensen Tool 200 NA 1 Heak Sink Grease NTE/Jameco NTE303 NA X1/2 screw & 4-40 nut NA NA NA 4 35mm DIN Rail Adaptor Scidyne PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129 NA 1 PCB Power Amp Design EVAL129 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

272 EVALUATION KIT FOR MODELS PAD128/ PAD129 EVAL129 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION (USE ALL OPTIONS THAT APPLY) Option 1. When using the PAD130 do not install jumpers J4,5. This applies whether or not the current limit module is installed. Option 2. When not using the PAD130 do install jumpers J4,5. This applies whether or not the current limit module is installed. The kit comes wired with this option. Option 3. To use the amplifier and current limit module together without fold-over current limit insert jumpers J1, 3. This applies whether or not the PAD130 is installed. The kit comes wired with this option. Option 4. To use the amplifier and current limit module together with fold-over current limit insert jumper J2. This applies whether or not the PAD130 is installed. PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129 4

273 EVALUATION KIT EVAL129 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129 5

274 EVALUATION KIT FOR MODELS PAD128/ PAD129 EVAL129 ASSEMBLED KIT Assembled EVAL129 with amplifier installed Optional accessory modules also shown PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

275 EVALUATION KIT FOR MODELS PAD128/ PAD129 EVAL129 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL129 EVALUATION KIT FOR MODELS PAD128/ 129 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

276 PowerAmp Design EVALUATION KIT FOR PAD135 EVAL135 Rev B INTRODUCTION The EVAL135 evaluation kit provides a convenient method to become familiar with the operation of the PAD135 Ink Jet Print Head Driver before your application circuit is committed to production. Some assembly is required since user selections are needed depending on the application. For example, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Connections are also provided for diode clamps on each power supply and the output for additional amplifier protection. Terminal strips are provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with this assembled evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be cut to length and used as sockets for the components you will use to complete your application circuit. You can solder these sockets at the input locations for the PAD135 and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. Assembled EVAL135 with PAD135 installed. 4. The evaluation kit PCB can be mounted in several ways: Option 1- Chassis mount. Use #6 standoffs and screws (not supplied) attached to the PCB at the four corners of the PCB. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to a 35mm DIN rail. For mounting the PCB to a DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. 5. Remove the 4 hex nuts from the mounting spacers of the PAD Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 7. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 8. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + at the location marked FAN on the PCB. Likewise insert the blue or black wire into the cage jack labeled at the location marked FAN. Do not solder the wires into the sockets. PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135

277 EVALUATION KIT FOR PAD135 EVAL135 ASSEMBLY STEPS CONTINUED 9. Use the bread-boarding area to add the external components necessary to program the amplifier gain and other circuit requirements to evaluate your application circuit. You can use the evaluation kit schematic and PCB views to map out your circuit. 10. Remember that the PAD135 must be compensated to operate correctly. See the PAD135 datasheet on Page 4, under PHASE COMPENSATION. The selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 10pF capacitor has already been installed in your kit. Another value may better suit your application. Remove and replace the capacitor as necessary for your application. 47pF and 22pF capacitors are also included with the kit. C C must be rated for at least 200V. A temperature stable type capacitor is required an X7R ceramic, for example, or an NPO type. 11. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 12. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135 2

278 EVAL135 EVALUATION KIT FOR PAD135 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD135 is purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1,2,5,6 4 C3, Cage Jacks w/carrier strip 32 wide Chip Capacitor, 1µF, 200V Electrolytic Capacitor, 150µF, 200V Power Amp Design Novacap Panasonic/Digi-Key CJS B105K201N ECOS2DP151BA JP1 1 BNC Jack AMP/Digi-Key JP2 1 JP3 1 Terminal Block, 5 position Terminal Block, 7 position Phoenix/Digi-Key Phoenix/Digi-Key Cc 1 Capacitor, 47pF Sprague/Mouser 561R10TCCQ47 Cc 1 Capacitor, 10pF Kemet/Mouser 561R10TCCQ10 Cc 1 Capacitor, 22pF Kemet/Mouser 561R10TCCQ22 D4, 6 2 Diode, Fast Recovery ON Semi/Digi-Key MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 NA 1 Nut Starter Menda/Jensen Tool 200 NA 2 35mm DIN Rail Adaptor Scidyne NA 1 PCB Power Amp Design EVAL135 NA PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

279 EVALUATION KIT FOR PAD135 EVAL135 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135 4

280 EVALUATION KIT EVAL135 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135 5

281 EVALUATION KIT FOR PAD135 EVAL135 ASSEMBLED KIT ASSEMBLED EVAL135 WITH PAD135 INSTALLED PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

282 EVALUATION KIT EVAL135 DIMENSIONAL INFORMATION TOP VIEW PowerAmp Design EVAL135 EVALUATION KIT FOR PAD135 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

283 PowerAmp Design EVALUATION KIT FOR MODELS PAD137 EVAL137 Rev A INTRODUCTION The EVAL137 evaluation kit provides a convenient method to become familiar with the operation of amplifier model PAD137 before your application circuit is committed to production. Some assembly is required since user selections are needed depending on the application. For example, a current limit resistor value needs to be selected by the user. Also, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Fold-over current limit components are not provided since each application will have different requirements. Connections are also provided for diode clamps on each power supply and the output for those applications in which significant inductive kickback may be found. Terminal strips are also provided for input and output signals and power. Sockets are also provided for the optional PAD125 Current Limit Accessory Modules as well as the PAD131 Fan Controller Accessory Module. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. Note that some heavy PCB copper planes and some heavy component leads are soldered in this kit. This may require a larger soldering iron tip and/or higher soldering iron temperatures than might normally be used. These steps are marked with an asterisk (*). 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with this assembled evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be cut to length and used as sockets for the components you will use to complete your application circuit. You can solder these sockets at the input locations for the amplifier and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. Refer to Jumper Selection below the Circuit Diagram for the EVAL137 on page 4. Install the required jumpers at the locations indicated depending on the option you have chosen. Jumpers of various lengths are included in this kit. Refer to the Assembled EVAL137 with amplifier and optional accessory modules installed. datasheet for the amplifier for complete information on current limit options. Jumpers for option 1 are already installed. Remove and replace the jumpers as needed for the option you have chosen. 4.* This step may require a soldering temperature higher than normal and/or a larger soldering iron tip. Three current limiting sense resistors, R S, are provided; one Ω, one Ω and one Ω. Refer to the data sheet for the PAD125 to determine which resistor value best fits your application (if you have chosen not to use the PAD125 module select the Ω resistor or install a length of heavy buss wire into the outer two holes at the location for the sense resistor R S ). Smear a small amount of heat sink grease on the back of the selected resistor and then attach the resistor to heat sink HS1 at R S with a 4-40 X ½ screw and nut. The plastic nut driver supplied with this kit will help here. Tighten the 4-40 resistor mounting hardware. Solder the resistor from the CIRCUIT SIDE of the PCB making sure that the holes are completely filled with solder. 5. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. 6. The evaluation kit PCB can be mounted in several ways. Option 1- Chassis mount. Use #6 standoffs and screws (not supplied) attached to the PCB at the four corners and center area of the PCB. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. PowerAmp Design EVAL137 EVALUATION KIT FOR MODEL PAD137

284 EVALUATION KIT FOR MODELS PAD137 EVAL137 ASSEMBLY STEPS CONTINUED Option 3- DIN rail mount. The PCB can be mounted to a 35mm DIN rail. For mounting the PCB to a DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. 7. Components for locations R1-R7, D1, D2 are for the optional fold-over current limiting and are not supplied. Refer to the datasheet of the amplifier model to find out how to apply circuits that require these components. 8. Remove the 4 hex nuts from the mounting spacers of the amplifier. 9. Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 10. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 11. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + and the black or blue wire into the jack marked at the location marked FAN. Or, if you plan to use the PAD131 Fan Controller Accessory Module, insert the fan wires similarly into the + and cage jacks at the location marked Fan Control. Do not solder the fan wires into the PCB. 12. Use the bread-boarding area to add the external components necessary to program the amplifier gain and other circuit requirements to evaluate your application circuit. You can use the evaluation kit schematic and PCB views to map out your circuit. 13. Remember that the amplifier must be compensated to operate correctly. See the amplifier datasheet on Page 4, under PHASE COMPENSATION. The selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 470pF capacitor has already been installed in your kit. Another value may better suit your application. Remove and replace the capacitor as necessary for your application. A 100pF capacitor is also included with the kit. C C must be rated for at least 100V. A temperature stable type capacitor is required an X7R ceramic, for example, or an NPO type. 14. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Do not forget any jumpers that need to be installed. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 15. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL137 EVALUATION KIT FOR MODEL PAD137 2

285 EVAL137 EVALUATION KIT FOR PAD137 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD137, PAD125, PAD131 are purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1, 2, 5, 6 4 C3, Cage Jacks w/carrier strip 32 wide Chip Capacitor, 200V 1uF Electrolytic Capacitor, 470µF 100V Power Amp Design Novacap Panasonic/Digi-Key NA 1825B105K201N ECO-S2AA471BA JP1 1 BNC Jack AMP/Digi-Key Cc 1 Cc 1 Capacitor 100pF 200V Capacitor 470pF 200V Kemet/Mouser Kemet/Mouser C052K101K2X5CA C052K471K2X5CA JP2 1 Terminal Block Phoenix/Digi-Key TS1 1 Terminal Strip Molex/Newark R S 3 Sense Resistor D4, 6 2 Diode, Fast Recovery Isotek Isotek Isotek ON Semi/Digi-Key PBV-R (5mΩ) PBV-R (10mΩ) PBV-R (15 mω) MUR410RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 HS1 1 Heat Sink Wakefield/Mouser 67720ABP NA 15 (5ea) Jumper 3M/Mouser C (0.1 in) C (0.2 in) C (0.3 in) NA 1 Nut Starter Menda/Jensen Tool 200 NA 1 Heak Sink Grease NTE/Jameco NTE303 NA X1/2 screw & 4-40 nut NA NA PowerAmp Design EVAL137 EVALUATION KIT FOR PAD137 NA 4 35mm DIN Rail Adaptor Scidyne NA 1 PCB Power Amp Design EVAL137 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

286 EVALUATION KIT FOR MODELS PAD137 EVAL137 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM JUMPER SELECTION (USE ALL OPTIONS THAT APPLY) Option 1. To use the amplifier and current limit module together without fold-over current limit insert jumpers J1 and J3 only. The kit comes wired with this option. Option 2. To use the amplifier and current limit module together with fold-over current limit insert jumper J2 only. Refer to the PAD Power Excel spreadsheet (available for download from the website) for assistance in calculating resistor values for fold-over current limiting. PowerAmp Design EVAL137 EVALUATION KIT FOR MODEL PAD137 4

287 EVALUATION KIT EVAL137 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL137 EVALUATION KIT FOR MODEL PAD137 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 5

288 EVALUATION KIT FOR MODEL PAD137 EVAL137 ASSEMBLED KIT ASSEMBLED EVAL137 WITH AMPLIFIER AND ACCESSORY MODULES MOUNTED PowerAmp Design EVAL137 EVALUATION KIT FOR MODEL PAD137 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

289 EVALUATION KIT FOR MODELS PAD137 EVAL137 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL137 EVALUATION KIT FOR MODEL PAD137 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

290 PowerAmp Design EVALUATION KIT FOR PAD183 EVAL183 Rev A INTRODUCTION The EVAL183 evaluation kit provides a convenient method to become familiar with the operation of the PAD183 Compact High Voltage Op Amp before your application circuit is committed to production. Some assembly is required since user selections are needed depending on the application. For example, there are several PCB mounting options available. Critical connections for power supply bypassing and compensation are pre-wired. Connections are also provided for diode clamps on each power supply and the output for additional amplifier protection. Terminal strips are provided for input and output signals and power. ASSEMBLY STEPS Please note that the #1 cause of problems for evaluation kit users is not reading and following the directions (all of them). The #2 cause of problems is poor solder joints (cold or bridging). Don t become a statistic. each step. Refer to the Illustrated Parts List for the components mentioned in the assembly steps. Notice that the same circuit board is used for the EVAL135 and that the circuit board is marked as such. Also note that the DUT location is marked as PAD135. Although the EVAL183 uses the same circuit board as the EVAL135 there are component value differences. 1. Notice that the printed circuit board (PCB) is labeled on one side as the DUT SIDE and the other side as CIRCUIT side. 2. As shown in the illustrated parts list, cage jack strips were used to provide you with this assembled evaluation kit. The carrier strips left over from the assembly have been included with the kit and can be cut to length and used as sockets for the components you will use to complete your application circuit. You can solder these sockets at the input locations for the PAD183 and other locations as desired. This can save soldering and unsoldering components as the needs of your application circuit change. 3. D3 and D5 are transient voltage suppressor diodes and are not supplied since the type (breakdown voltage) varies with the application. They are not necessary for every application. They are most commonly used in application circuits where kickback from the load may force the supply voltage above the limits of the amplifier. Assembled EVAL183 with PAD183 installed. 4. The evaluation kit PCB can be mounted in several ways: Option 1- Chassis mount. Use #6 standoffs and screws (not supplied) attached to the PCB at the four corners of the PCB. Option 2- Bench-top mount. Use the five rubber bumpers supplied. These are stick-on components. Remove the release paper from each bumper and apply the bumper to the square outlines on the CIRCUIT SIDE of the PCB. Option 3- DIN rail mount. The PCB can be mounted to a 35mm DIN rail. For mounting the PCB to a DIN rail press the adaptors into the PCB in the holes at the edges of the PCB at locations 1 and 2 from the CIRCUIT SIDE of the PCB. Make sure that the plastic tines have fully spread out on the DUT SIDE of the PCB. 5. Remove the 4 hex nuts from the mounting spacers of the PAD Align the 4 studs of the mounting spacers with the mounting holes in the PCB. Be sure that the amplifier s pin 1 aligns with pin 1 on the PCB. Slowly lower the amplifier into the PCB, making sure that the pins of the amplifier and the cage jacks mate. Push the amplifier into the PCB until the mounting spacers meet the PCB. 7. Fasten the amplifier to the PCB with the 4 hex nuts previously removed. Do not over-tighten the nuts as this may strip the mounting studs. The provided plastic nut starter can assist you here. 8. If necessary, strip 1/8 of insulation from the wires connected to the fan. Twist and tin the wire ends. Insert the red wire into the cage jack labeled + at the location marked FAN on the PCB. Likewise insert the blue or black wire into the cage jack labeled at the location marked FAN. Do not solder the wires into the sockets. PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183

291 EVALUATION KIT FOR PAD183 EVAL183 ASSEMBLY STEPS CONTINUED 9. Use the bread-boarding area near pin 14 on the PCB to add the external components necessary to program the amplifier gain and other circuit requirements to evaluate your application circuit. You can use the evaluation kit schematic and PCB views to map out your circuit. 10. Remember that the PAD183 must be compensated to operate correctly. See the PAD183 datasheet on Page 4, under PHASE COMPENSATION. The selected phase compensation capacitor will be installed at C C on the evaluation kit PCB. A 47pF capacitor has already been installed in your kit. Another value may better suit your application. Remove and replace the capacitor as necessary for your application. 22pF and 150pF capacitors are also included with the kit. C C must be rated for at least 350V. A temperature stable type capacitor is required an X7R ceramic, for example, or an NPO type (preferably). 11. The evaluation kit assembly is complete. Be sure you have read and followed all the assembly steps. Inspect the circuit board for solder shorts or poor solder joints. An illuminated magnifier is helpful. 12. Before applying power to your circuit set the power supply for ±20V and set the power supply current limit to approximately 100mA. Use little or no load at first. Apply an input signal and check the output with an oscilloscope to verify proper functionality. This step can prevent damaging the amplifier or the circuit board should there be some mistake in assembly. PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183 2

292 EVAL183 EVALUATION KIT FOR PAD183 AMPLIFIER ILLUSTRATED PARTS LIST Note that the PAD183 is purchased separately. Ref Qty Description Mfg/Distributor Mfg. Part Number Illustration (not to scale) Amplifier Pins TPs C1,2,5,6 4 C3, 4 2 C7 1 1 Cage Jacks w/carrier strip 32 wide Chip Capacitor, 0.2µF, 500V Electrolytic Capacitor, 100µF, 350V Electrolytic Capacitor, 47µF, 35V Power Amp Design Novacap Panasonic/Digi-Key Panasonic/Digi-Key CJS B204M501NT EEU-EB2V101 EEU-FC1V470 JP1 1 BNC Jack AMP/Digi-Key JP2 1 JP3 1 Terminal Block, 5 position Terminal Block, 7 position Phoenix/Digi-Key Phoenix/Digi-Key Cc 1 Capacitor, 47pF Vishay/Mouser 561R10TSQ47 Cc 1 Capacitor, 22pF Vishay/Mouser 561R10TCCQ22 Cc 1 Capacitor, 150pF Vishay/Mouser 561R10TCCT15 D4, 6 2 Diode, Fast Recovery ON Semi/Digi-Key MUR460RL NA 5 Rubber Bumper 3M/Digi-Key SJ5518 NA 1 Nut Starter Menda/Jensen Tool 200 NA 2 35mm DIN Rail Adaptor Scidyne PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183 NA 1 PCB Power Amp Design EVAL135 NA Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 3

293 EVALUATION KIT FOR PAD183 EVAL183 CIRCUIT & CONNECTIONS CIRCUIT DIAGRAM PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183 4

294 EVALUATION KIT EVAL183 PCB VIEWS TOP VIEW BOTTOM VIEW PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183 5

295 EVALUATION KIT FOR PAD183 EVAL183 ASSEMBLED KIT ASSEMBLED EVAL183 PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 6

296 EVALUATION KIT FOR PAD183 EVAL183 DIMENSIONAL INFORMATION BOARD OUTLINE DIMENSIONS PowerAmp Design EVAL183 EVALUATION KIT FOR PAD183 Power Amp Design 3381 W Vision Dr Tucson AZ USA Phone (520) Fax (208) Web Site: 7

297 PowerAmp Design Simple Power Op Amp Solutions

298 About PAD PAD was founded in 2002 to develop a new generation of power op amps s for industrial applications PAD amplifier products span a voltage range of 100 to 500V, current ratings from 1.5A to 40A and a power dissipation range from 29W to 225W with footprints ranging from 40mm square to 80mm square Typical applications for PAD products include: Brush motor drive Sonar transducer drive Industrial Ink Jet Print Head Drive Scanning tunneling microscopes ATE pin drivers Ultra-sound transducer drive Scientific instrumentation Semi-conductor capital equipment

299

300 PAD Design Goals The new PAD products have achieved their power op amp design goals: Replace aging industry hybrid amplifiers with more modern and cost effective designs Improve power amplifier performance at a lower cost than hybrid designs Provide an integrated cooling solution Provide a compact simple plug & play power amplifier solution

301 PAD Design Support All PAD products are supported with: Expert applications assistance SPICE models for common circuit simulators Evaluation kits for each model PAD Power,, our Excel based design verification spreadsheet Accessory modules to modify or enhance normal amplifier operation Custom designs with or without heat sinks & fans

302 PAD New Concepts PAD high power op amps offer a new concept: an integrated heat sink and fan optimize amplifier cooling while decreasing size and increasing power density PAD amplifiers are constructed with low cost surface mount technology on an insulated metal substrate and uses no beryllium oxide (BeO). PAD optional accessory modules to enhance amplifier performance

303 PAD Amplifier Advantages Compact plug-in design with integrated active heat sink cooling Amplifier temp range from -40C to +105C (designs without fan and -55C to +125C temp range available on special request) No separate components to procure or assemble (heat sink, thermal grease,, amplifier) Real-world power ratings (not relative to the infinite heat sinks of competitive products) Best technical specifications available Most amplifiers offer thermal shutdown and analog temperature output voltage Extensive accessory modules offered

304 Active Cooling Comparisons Both heat sinks shown have a thermal resistance of 0.5 o C/Watt Aavid passive heat sink volume is 100 in 3 and weighs 73 oz. PAD active heat sink volume is only 4.6 in 3 and weighs only 4 oz. PAD cooling fan consumes only 1.5 watts

305 Amplifier Attachment Amplifier pre-attached to heat sink with heat and pressure for a high quality interface

306 PAD Products Also Available on Custom Passive Heat Sinks for Special Applications PAD amplifiers mounted on passive heat sinks under PAD custom designed motherboards

307 PAD Accessory Modules Optional accessory modules offer new features to amplifier models For example: model PAD125 offers programmable current limit features PAD131 offers cooling fan control PAD130 offers RRIO * operation for some models * rail to rail input & output

308 PAD Evaluation Kits Most amplifier models offer dedicated evaluation kits for circuit development Evaluation kits are assembled and include all special components needed for the model Evaluation kits provide support for optional accessory modules