EQUIVALENT CIRCUIT DIAGRAM

Transcription

1 MP Power Operational Amplifier MP MP FEATURES LOW COST HIGH VOLTAGE - VOLTS HIGH PUURRENT- 5 AMP PULSE PUT, 5 AMP CONTINUOUS 7 WATT DISSIPATION CAPABILITY V/µS SLEW RATE 5kHz POWER BANDWIDTH APPLICATIONS INKJET PRINTER HEAD DRIVE PIEZO TRANSDUCER DRIVE INDUSTRIAL INSTRUMENTATION REFLECTOMETERS ULTRA-SOUND TRANSDUCER DRIVE DESCRIPTION The MP operational amplifier is a surface mount constructed component that provides a cost-effective solution in many industrial applications. The MP offers outstanding performance that rivals much more expensive hybrid components yet has a footprint of only 4 sq in. The MP has many optional features such as four-wire current limit sensing and external compensation. The 5 khz power bandwidth and 5 amp continuous and 5A pulse output of the MP makes it a good choice for piezo transducer drive applications. The MP is built on a thermally conductive but electrically insulating substrate that can be mounted to a heat sink. +Vb 8 EQUIVALENIRCUIT DIAGRAM +Vb BACK PLATE TP Cc Cc -IN +IN 4 C5 C R9 R QA SUBSTRATE BACKPLATE R D Q Q Q5A R Q4 Q5B R Q R QB Q7 Q R5 IC Q4 R R7 R8 Q6 Q7 Q8 Q9 Q4 Q8 Q9 Q Q R5 D Q Q6 R Q 8 7 Q +Ilim -Ilim -Vb C R9 R 7 8 -Vb 5 9 Copyright Apex Microtechnology, Inc. MPU SEP (All Rights Reserved) MPU REVF

2 MP ABSOLUTE MAXIMUM RATINGS SPECIFICATIONS Parameter Symbol Min Max Units SUPPLY VOLTAGE, to -V S V SUPPLY VOLTAGE, +V B (Note 6), +5 V SUPPLY VOLTAGE, -V B (Note 6) -V S, -5 V PUURRENT, peak, within SOA 5 A POWER DISSIPATION, internal, DC 7 W INPUT VOLTAGE +V B to -V B V DIFFERENTIAL INPUT VOLTAGE V TEMPERATURE, pin solder, s 5 C TEMPERATURE, junction (Note ) 75 C TEMPERATURE, storage C OPERATING TEMPERATURE RANGE, case C INPUT Parameter Test Conditions (Note ) Min Typ Max Units OFFSET VOLTAGE 5 mv OFFSET VOLTAGE, vs. temperature Full temp range 5 µv/ C OFFSET VOLTAGE, vs. supply µv/v BIAS CURRENT, initial (Note ) pa BIAS CURRENT, vs. supply. pa/v OFFSEURRENT, initial 5 pa INPUT RESISTAE, DC Ω INPUAPACITAE 4 pf COMMON MODE VOLTAGE RANGE COMMON MODE VOLTAGE RANGE COMMON MODE REJECTION, DC +V B - 5 V -V B + 5 V 9 db NOISE MHz BW, R S = KΩ µv RMS GAIN OPEN 5Hz = KΩ, = pf 96 db GAIN BANDWIDTH MHz = pf 6 MHz PHASE MARGIN Full temp range 45 PUT VOLTAGE SWING = 5A V VOLTAGE SWING = -5A -V S + -V S V VOLTAGE SWING = 5A, +V B = +V -.8 V VOLTAGE SWING = -5A, -V B = -V S -V -V S +. V MPU

3 MP Parameter Test Conditions (Note ) Min Typ Max Units CURRENT, CONTINUOUS, DC 5 A SLEW RATE, A V = - = pf V/µS SETTLING TIME to.% V step µs RESISTAE No load, DC Ω POWER BANDWIDTH V P-P POWER SUPPLY = pf, = 5V, -V S = -5V 5 khz VOLTAGE ±5 ±45 ±5 V CURRENT, quiescent 4 57 ma THERMAL RESISTAE, AC, junction to case (Note 5) Full temp range, F 6Hz.65 C/W RESISTAE, DC, junction to case Full temp range, F<6Hz.88 C/W RESISTAE, junction to air Full temp range C/W TEMPERATURE RANGE, case C NOTES: * The specification of MPA is identical to the specification for MP in the applicable column to the left.. Unless otherwise noted: = 5 C, = pf. DC input specifications are value given. Power supply voltage is typical rating.. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power dissipation to achieve high MTTF.. Doubles for every C of case temperature increase. 4. and -V S 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 6Hz. 6. Power supply voltages +V B and -V B must not be less than and -V S respectively. MPU

4 MP TYPICAL PERFORMAE GRAPHS INTERNAL POWER DISSIPATION, P (W) POWER DERATING CASE TEMPERATURE, ( C) SMALL SIGNAL RESPONSE W/ BOOST PHASE, Φ ( ) PHASE RESPONSE W/ BOOST = pf = 68pF = pf = A - K K M M SMALL SIGNAL RESPONSE W/O BOOST PHASE, Φ ( ) PHASE RESPONSE W/O BOOST = pf = 68pF = pf = A - K M M POWER RESPONSE OPEN LOOP GAIN, A (db) NORMALIZED CURRENT LIMIT, (%) DISTORTION, THD (%) CASE TEMPERATURE, ( C) HARMONIC DISTORTION.. = pf = pf = 47pF = A DC K KK M M CURRENT LIMIT A V = = pf V S = 5V P O = 5W P O = W P O = 75W. K K K OPEN LOOP GAIN, A (db) NORMALIZED QUIESCENURRENT, I Q (%) VOLTAGE DROP FROM SUPPLY, (V) 6 = pf 4 = 68pF = pf = A DC K K K M M QUIESCENURRENT vs. SUPPLY = -4 C TOTAL SUPPLY VOLTAGE, V S (V) PUT VOLTAGE SWING = 5 C W/O BOOST FROM W/O BOOST FROM -V S =5 C 5mS PULSE = 85 C WITH BOOST FROM -V S WITH BOOST FROM PUURRENT, (A) PUT VOLTAGE, V O (V P-P ) NORMALIZED QUIESCENURRENT, I Q (%) PUURRENT FROM OR -V S (A) K K M 5M FREQUEY, F(Hz) QUIESCENURRENT vs. TEMP CASE TEMPERATURE ( C) SAFE OPERATING AREA 5 V S TOTAL V B CC =47pF S, =5 C ms, =5 C CC =pf ms, =5 C CC =68pF CC =pf DC, =5 C CC =pf DC, =85 C SUPPLY TO PUT DIFFERENTIAL, V S -V O (V) 4 MPU

5 MP EXTERNAL CONNECTIONS C5 C C C TP BACK +V B +V B PLT VIEW FROM COMPONENT SIDE -IN +IN -V B +I LIM -I LIM -V B -V S -V S -V S C7 IM C8 + C LOAD & FEEDBACK NOTES: IS NPO (COG) RATED FOR FULL SUPPLY VOLTAGE TO -V S. BOTH PINS AND REQUIRED CONNECTED TO SIGNAL GROUND. C AND C ELECTROLYTIC µf PER AMP PUURRENT. C, C4, C5-8 HIGH QUALITY CERAMIC.µF. ALL PUT PINS MUST BE TIED TOGETHER. SEE PACKAGE LINE FD IN THE LINE DIMENSIONS DATASHEET. TYPICAL APPLICATION INKJET NOZZLE DRIVE The MP's fast slew rate and wide power bandwith make it an ideal nozzle driver for industrial inkjet printers. The 5 amp pulse output capability can drive hundreds of inkjet nozzles simultaneously. pf 68pF pf 47pF pf pf C4 PHASE COMPENSATION GAIN W/O BOOST 4 GAIN W BOOST 6 TYP. SLEW RATE 55 V/µS 6 V/µS V/µS TYP. SLEW RATE V/µS 7 V/µS 55 V/µS R F R I PRINT NOZZLE COMMAND VOLTAGE +V B -V B -V S -I LIM +I LIM IM PIEZO TRANSDUCER 4-pin DIP PACKAGE STYLE FD -V S MPU 5

6 MP GENERAL Please read Application Note "General Operating Considerations" which covers stability, power supplies, heat sinking, mounting, current limit, SOA interpretation, and specification interpretation. Visit for design tools that help automate tasks such as calculations for stability, internal power dissipation, current limit, heat sink selection, Apex Microtechnology's complete Application Notes library, Technical Seminar Workbook and Evaluation Kits. GROUND PINS The MP has two ground pins (pins, ). These pins provide a return for the internal capacitive bypassing of the small signal portions of the MP. The two ground pins are not connected together on the substrate. Both of these pins are required to be connected to the system signal ground. SAFE OPERATING AREA The MOSFET output stage of the MP is not limited by second breakdown considerations as in bipolar output stages. Only thermal considerations and current handling capabilities limit the SOA (see Safe Operating Area graph on previous page). The output stage is protected against transient flyback by the parasitic body diodes of the output stage MOSFET structure. However, for protection against sustained high energy flyback external fast-recovery diodes must be used. COMPENSATION The external compensation capacitor is connected between pins 5 and 6. Unity gain stability can be achieved with any capacitor value larger than pf for a minimum phase margin of 45 degrees. At higher gains more phase shift can usually be tolerated in most designs and the compensation capacitor value can be reduced resulting in higher bandwidth and slew rate. Use the typical operating curves as a guide to select for the application. An NPO (COG) type capacitor is required rated for the full supply voltage (V). OVERVOLTAGE PROTECTION Although the MP can withstand differential input voltages up to ±5V, additional external protection is recommended. In most applications N448 signal diodes connected anti-parallel across the input pins is sufficient. In more demanding applications where bias current is important diode connected JFETs such as N446 will be required. See Q and Q in Figure. In either case the differential input voltage will be clamped to ±.7V. This is usually sufficient overdrive to produce the maximum power bandwidth. Some applications will also need over voltage protection devices connected to the power supply rails. Unidirectional zener diode transient suppressors are recommended. The zeners clamp transients to voltages within the power supply rating and also clamp power supply reversals to ground. Whether the zeners are used or not the system power supply should be evaluated for transient performance including power-on overshoot and power-off polarity reversals as well as line regulation. See Z and Z in Figure. POWER SUPPLY BYPASSING Bypass capacitors to power supply terminals and -V S must be connected physically close to the pins to prevent local parasitic oscillation in the output stage of the MP. Use electrolytic capacitors at least µf per output amp required. Bypass the electrolytic capacitors with high quality ceramic capacitors (X7R).µF or greater. In most applications power supply terminals +Vb and -Vb will be connected to and -V S respectively. Supply voltages +Vb and -Vb are bypassed internally but both ground pins and must be connected to the system signal ground to be effective. In all cases power to the buffer amplifier stage of the MP at pins 8 and 5 must be connected to +Vb and -Vb at pins 4 and respectively. Provide local bypass capacitors at pins 8 and 5. See the external connections diagram on page. -IN Q +IN 4 Q +Vb -Vb Z Z FIGURE. OVERVOLTAGE PROTECTION 6 MPU

7 MP CURRENT LIMIT The two current limit sense lines are to be connected directly across the current limit sense resistor. For the current limit to work correctly pin 8 must be connected to the amplifier output side and pin 7 connected to the load side of the current limit resistor IM as shown in Figure. This connection will bypass any parasitic resistances R P, formed by socket and solder joints as well as internal amplifier losses. The current limiting resistor may not be placed anywhere in the output circuit except where shown in Figure. The value of the current limit resistor can be calculated as follows: IM =.65/ I LIMIT BOOST OPERATION With the boost feature the small signal stages of the amplifier are operated at a higher supply voltages than the amplifier's high current output stage. +Vb (pins 4,8) and -Vb (pins 5,) are connected to the small signal stages and (pins 4-6) and -V S (pins 7-9) are connected to the high current output stage. An additional V on the +Vb and -Vb pins is sufficient to allow the small signal stages to drive the output stage into the triode region and improve the output voltage swing for extra efficient operation when required. When the boost feature is not needed and -V S are connected to the +Vb and -Vb pins respectively. The +Vb and -Vb pins must not be operated at supply voltages less than and -V S respectively. BACKPLATE GROUNDING The substrate of the MP is an insulated metal substrate. It is required that it be connected to signal ground. Connect pin (back plate) to signal ground. The back plate will then be AC grounded to signal ground through a µf capacitor. IN R IN 4 I LIM- R F 7 I LIM+ 8 R P - - IM FIGURE. 4 WIRE CURRENT LIMIT NEED TECHNICAL HELP? CONTACT APEX SUPPORT! For all Apex Microtechnology product questions and inquiries, call toll free in North America. For inquiries via , please contact apex.support@apexanalog.com. International customers can also request support by contacting their local Apex Microtechnology Sales Representative. To find the one nearest to you, go to IMPORTANT NOTICE Apex Microtechnology, Inc. has made every effort to insure the accuracy of the content contained in this document. However, the information is subject to change without notice and is provided "AS IS" without warranty of any kind (expressed or implied). Apex Microtechnology reserves the right to make changes without further notice to any specifications or products mentioned herein to improve reliability. This document is the property of Apex Microtechnology and by furnishing this information, Apex Microtechnology grants no license, expressed or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other intellectual property rights. Apex Microtechnology owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for use within your organization with respect to Apex Microtechnology integrated circuits or other products of Apex Microtechnology. This consent does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale. APEX MICROTECHNOLOGY PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN PRODUCTS USED FOR LIFE SUPPORT, AUTOMOTIVE SAFETY, SECURITY DEVICES, OR OTHER CRITICAL APPLICATIONS. PRODUCTS IN SUCH APPLICATIONS ARE UNDER- STOOD TO BE FULLY AT THE CUSTOMER OR THE CUSTOMER S RISK. Apex Microtechnology, Apex and Apex Precision Power are trademarks of Apex Microtechnolgy, Inc. All other corporate names noted herein may be trademarks of their respective holders. Copyright Apex Microtechnology, Inc. MPU SEP (All Rights Reserved) 7 MPU REVF