LW020 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 20 W

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Lesley Cooper
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1 Features Low profile: 9.91 mm (.39 in.) with.38 mm (.15 in.) standoffs, 9.53 mm (.375 in.) with standoffs recessed Wide input voltage range: 36 to 75 Overcurrent protection Output overvoltage protection Input-to-output isolation: 15 Operating case temperature range: 4 C to +11 C Remote on/off The LW2 Single-Output-Series Power Modules use advanced, surface-mount technology and deliver high-quality, compact, dc-dc conversion at an economical price. Applications Distributed power architectures Communication equipment Computer equipment Options Choice of remote on/off configuration Case ground pin Synchronization Short pins: 2.79 mm ±.25 mm (.11 in. ±.1 in.) Short pins: 3.68 mm ±.25 mm (.145 in. ±.1 in.) Output voltage adjustment: 9% to 11% of O, nom JQA Certified to EN695 UL* 195 Recognized, CSA C22.2 No Certified, DE 85 (EN695, IEC95) Licensed CE mark meets 73/23/EEC and 93/68/EEC directives Within FCC Class A radiated limits Description The LW2 Single-Output-Series Power Modules are low-profile dc-dc converters that operate over an input voltage range of 36 to 75 and provide precisely regulated outputs. The outputs are isolated from the input, allowing versatile polarity configurations and grounding connections. Built-in filtering for both input and output minimizes the need for external filtering. The modules have a maximum power rating of 2 W at a typical full-load efficiency of up to 85%. * UL is a registered trademark of Underwriters Laboratories, Inc. CSA is a registered trademark of Canadian Standards Association. DE is a trademark of erband Deutscher Elektrotechniker e.. This product is intended for integration into end-use equipment. the required procedures for CE marking of end-use equipment should be followed. (The CE mark is placed on selected products.)

2 Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the devices. These are absolute stress ratings only. Functional operation of the devices is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Input oltage: Continuous Transient (1 ms) Operating Case Temperature (See Thermal Considerations section.) Parameter Symbol Min Max Unit * Maximum case temperature varies based on power dissipation. See derating curve, Figure 16, for details. I I, trans 8 1 TC 4 11* C Storage Temperature Tstg 4 12 C I/O Isolation oltage 15 Electrical Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. Table 1. Input Specifications Parameter Symbol Min Typ Max Unit Operating Input oltage I Maximum Input Current II, max 1.1 A (I = to I, max; IO = IO, max; see Figure 1.) Inrush Transient i 2 t.1 A 2 s Input Reflected-ripple Current (5 Hz to 2 MHz; 12 µh source impedance, TC = 25 C; see Figure 11 and Design Considerations section.) II 3 map-p Input Ripple Rejection (1 Hz12 Hz) 6 db Fusing Considerations CAUTION: This power module is not internally fused. An input line fuse must always be used. This encapsulated power module can be used in a wide variety of applications, ranging from simple stand-alone operation to an integrated part of a sophisticated power architecture. To preserve maximum flexibility, internal fusing is not included; however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies require a normal-blow fuse with a maximum rating of 5 A (see Safety Considerations section). Based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. Refer to the fuse manufacturer s data for further information. 2 Lucent Technologies Inc.

3 Electrical Specifications (continued) Table 2. Output Specifications Parameter Device Symbol Min Typ Max Unit Output oltage Set Point (I = 48 ; IO = IO, max; TC = 25 C) Output oltage (Over all line, load, and temperature conditions until end of life; see Figure 13.) Output Regulation: Line (I = 36 to 75 ) Load (IO = IO, min to IO, max) Temperature (TC = 4 C to +1 C) Output Ripple and Noise oltage (See Figure 12.): RMS Peak-to-peak (5 Hz to 2 MHz) Output Current (At IO < IO, min, the modules may exceed output ripple specifications.) Output Current-limit Inception (O = 9% x O, set; see Figure 2.) Output Short-circuit Current (O = 25 m) Efficiency (I, nom; IO = IO, max; TC = 25 C; see Figures 37 and 13.) LW2G LW2F LW2A LW2B LW2C LW2G LW2F LW2A LW2B LW2C LW2A, F, G LW2B, C LW2A, F, G LW2B, C LW2A, F, G LW2B LW2C O, set O, set O, set O, set O, set O O O O O IO IO IO %O %O %O mrms mrms mp-p mp-p IO %IO, max LW2C LW2B LW2A, F, G LW2G LW2F LW2A LW2B LW2C IO IO IO A A A %IO, max %IO, max %IO, max Switching Frequency 256 khz Dynamic Response ( IO/ t = 1 A/1 µs, I = I, nom, TA = 25 C): Load Change from IO = 5% to 75% of IO, max: Peak Deviation Settling Time (O < 1% peak deviation) Load Change from IO = 5% to 25% of IO, max: Peak Deviation Settling Time (O < 1% peak deviation) η η η η η % % % % % %O, set ms %O, set ms Lucent Technologies Inc. 3

4 Electrical Specifications (continued) Table 3. Isolation Specifications Parameter Min Typ Max Unit Isolation Capacitance.2 µf Isolation Resistance 1 MΩ General Specifications Parameter Min Typ Max Unit Calculated MTBF (IO = 8% of IO, max; TC = 4 C) 4,5, hours Weight 54 (1.9) g (oz.) Feature Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. See Feature Descriptions and Design Considerations for further information. Parameter Device Symbol Min Typ Max Unit Remote On/Off Signal Interface: (I = to I, max; open collector or equivalent compatible; signal referenced to I( ) terminal. See Figure 14 and Feature Descriptions.): Negative Logic: Device Code Suffix 1 : Logic LowModule On Logic HighModule Off Positive Logic: If Device Code Suffix 1 is not specified: Logic LowModule Off Logic HighModule On Module Specifications: On/Off CurrentLogic Low On/Off oltage: Logic Low Logic High (Ion/off = ) Open Collector Switch Specifications: Leakage Current During Logic High (on/off = 1 ) Output Low oltage During Logic Low (Ion/off = 1 ma) Ion/off on/off on/off Ion/off on/off ma µa 4 Lucent Technologies Inc.

5 Feature Specifications (continued) Parameter Device Symbol Min Typ Max Unit Turn-on Delay and Rise Times (at 8% of IO, max; TA = 25 C): Case 1: On/Off Input Is Set for Unit On and then Input Power Is Applied (delay from point at which I = 48 until O = 1% of O, nom). Case 2: 48 Input Is Applied for at Least One Second, and then the On/Off Input Is Set to Turn the Module On (delay from point at which on/off input is toggled until O = 1% of O, nom). Output oltage Rise Time (time for O to rise from 1% of O, nom to 9% of O, nom) Output oltage Overshoot (at 8% of IO, max; Tdelay Tdelay Trise ms ms ms % TA = 25 C) Output oltage Set-point Adjustment Range LW2B others Output Overvoltage Protection (clamp) LW2G LW2F LW2A LW2B LW2C O, clamp O, clamp O, clamp O, clamp O, clamp %O, nom %O, nom Lucent Technologies Inc. 5

6 Characteristics Curves 76 INPUT CURRENT, II (A) PO = 2 W PO = 1 W PO = 2 W EFFICIENCY, (%) I = 36 I = 48 I = (C).a INPUT OLTAGE, I () Figure 1. LW2 Typical Input Characteristics, TA = 25 C NORMALIZED OUTPUT OLTAGE, O () 1% O, nom 8% O, nom 6% O, nom 4% O, nom 2% O, nom 5% IO, max I = 75 I = 54 I = 36 1% IO, max (C).a 15% IO, max NORMALIZED (C).a Figure 2. LW2A, B, C, F, and G Typical Output Characteristics, TA = 25 C Figure 3. LW2G Typical Converter Efficiency vs. Output Current, TA = 25 C EFFICIENCY, (%) I = 75 I = 54 I = (C) Figure 4. LW2F Typical Converter Efficiency vs. Output Current, TA = 25 C 6 Lucent Technologies Inc.

7 Characteristics Curves (continued) EFFICIENCY, (%) I = 36 I = 54 I = 75 EFFICIENCY, (%) I = 75 I = 54 I = (C) 8-126(C).a Figure 5. LW2A Typical Converter Efficiency vs. Output Current EFFICIENCY, (%) I = 75 I = 54 I = (C) Figure 6. LW2B Typical Converter Efficiency vs. Output Current, TA = 25 C Figure 7. LW2C Typical Converter Efficiency vs. Output Current, TA = 25 C NORMALIZED OUTPUT OLTAGE, O () NORMALIZED 1% O, nom 99% O, nom 75% IO, max 5% IO, max TIME, t (1 µs/div) (C).a Figure 8. LW2A, B, C, F, and G Typical Output oltage for a Step Load Change from 5% to 75% Lucent Technologies Inc. 7

8 Characteristics Curves (continued) Test Configurations TO OSCILLOSCOPE NORMALIZED OUTPUT OLTAGE, O () 11% O, nom 1% O, nom LTEST 12 µh CS 22 µf BATTERY IMPEDANCE <.1 Ω 33 2 C, 1 khz CURRENT PROBE I(+) I( ) NORMALIZED 5% IO, max 25% IO, max 8-23(C) Note: Input reflected-ripple current is measured with a simulated source impedance of 12 µh. Capacitor Cs offsets possible battery impedance. Current is measured at the input of the module. Figure 11. Input Reflected-Ripple Test Setup TIME, t (1 µs/div) (C).b Figure 9. LW2A, B, C, F, and G Typical Output oltage for a Step Load Change from 5% to 25% O(+) COPPER STRIP.1 µf SCOPE RESISTIE LOAD O( ) REMOTE ON/OFF, on/off () (2 /div) NORMALIZED OUTPUT OLTAGE, O (1 /div) 5 1% O, nom 5% O, nom 8-513(C) Note: Use a.1 µf ceramic capacitor. Scope measurement should be made using a BNC socket. Position the load between 5 mm and 75 mm (2 in. and 3 in.) from the module. Figure 12. Peak-to-Peak Output Noise Measurement Test Setup SUPPLY II I(+) O(+) CONTACT AND DISTRIBUTION LOSSES IO LOAD TIME, t (1 ms/div) (C).b Figure 1. LW2A, B, C, F, and G Typical Output oltage Start-Up when Signal Applied to Remote On/Off I( ) O( ) CONTACT RESISTANCE 8-24(C) Note: measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance. [ O(+) O( ) ]IO η = % [ I(+) I( ) ]II Figure 13. Output oltage and Efficiency Measurement Test Setup 8 Lucent Technologies Inc.

9 Design Considerations Grounding Considerations For standard units, the case is connected internally to I(+). For units with the case ground pin option, the case is not connected internally allowing the user flexibility in grounding. Input Source Impedance The power module should be connected to a low acimpedance input source. Highly inductive source impedances can affect the stability of the power module. For the test configuration in Figure 11, a 33 µf electrolytic capacitor (ESR <.7 Ω at 1 khz) mounted close to the power module helps ensure stability of the unit. For other highly inductive source impedances, consult the factory for further application guidelines. Safety Considerations For safety-agency approval of the system in which the power module is used, the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standard, i.e., UL 195, CSA C22.2 No , and DE 85 (EN695, IEC95). If the input source is non-sel (EL or a hazardous voltage greater than 6 and less than or equal to 75 ), for the module's output to be considered meeting the requirements of safety extra-low voltage (SEL), all of the following must be true: The input source is to be provided with reinforced insulation from any other hazardous voltages, including the ac mains. One I pin and one O pin are to be grounded or both the input and output pins are to be kept floating. The input pins of the module are not operator accessible. Another SEL reliability test is conducted on the whole system, as required by the safety agencies, on the combination of supply source and the subject module to verify that under a single fault, hazardous voltages do not appear at the module's output. Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-sel voltage to appear between the output pins and ground. The power module has extra-low voltage (EL) outputs when all inputs are EL. The input to these units is to be provided with a maximum 5 A normal-blow fuse in the ungrounded lead. Feature Descriptions Overcurrent Protection To provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting for an unlimited duration. At the point of current-limit inception, the unit shifts from voltage control to current control. If the output voltage is pulled very low during a severe fault, the current-limit circuit can exhibit either foldback or tailout characteristics (output-current decrease or increase). The unit operates normally once the output current is brought back into its specified range. Output Overvoltage Protection The output overvoltage clamp consists of control circuitry, independent of the primary regulation loop, that monitors the voltage on the output terminals. The control loop of the protection circuit has a higher voltage set point than the primary loop (see Feature Specifications table). In a fault condition, the overvoltage clamp ensures that the output voltage does not exceed O, clamp, max. This provides a redundant voltage-control that reduces the risk of output overvoltage. Remote On/Off Two remote on/off options are available. Positive logic remote on/off turns the module on during a logic-high voltage on the REMOTE ON/OFF pin, and off during a logic low. Negative logic remote on/off, device code suffix 1, turns the module off during a logic high and on during a logic low. To turn the power module on and off, the user must supply a switch to control the voltage between the on/off terminal and the I( ) terminal (on/off). The switch can be an open collector or equivalent (see Figure 14). A logic low is on/off =.7 to 1.2. The maximum Ion/off during a logic low is 1 ma. The switch should maintain a logic-low voltage while sinking 1 ma. During a logic high, the maximum on/off generated by the power module is 6. The maximum allowable leakage current of the switch at on/off = 6 is 5 µa. Lucent Technologies Inc. 9

10 Feature Descriptions (continued) Remote On/Off (continued) The module has internal capacitance to reduce noise at the ON/OFF pin. Additional capacitance is not generally needed and may degrade the start-up characteristics of the module. on/off + Ion/off I(+) I( ) REMOTE ON/OFF 8-758(C).a Figure 14. Remote On/Off Implementation Output oltage Adjustment Output voltage trim allows the user to increase or decrease the output voltage set point of a module. This is accomplished by connecting an external resistor between the TRIM pin and either the O(+) or O( ) pins. With an external resistor between the TRIM and O(+) pins (Radj-down), the output voltage set point (O, adj) decreases. With an external resistor between the TRIM pin and O( ) pin (Radj-up), O, adj increases. The following equations determine the required external resistor value to obtain an output voltage change of %: Radj-down = cd [ ( 1 % ) 1] b kω % Radj-up = a d % b kω Device a b c d 5% O Radj-down +5% O Radj-up LW2G kω 88.9 kω LW2F kω 52.8 kω LW2A kω 23.3 kω LW2B kω 16. kω LW2C kω 18.2 kω The adjusted output voltage cannot exceed 11% of the nominal output voltage between the O(+) and O( ) terminal. The modules have a fixed current-limit set point. Therefore, as the output voltage is adjusted down, the available output power is reduced. In addition, the minimum output current is a function of the output voltage. As the output voltage is adjusted down, the minimum required output current can increase. 1 Lucent Technologies Inc.

11 TU Rheinland Feature Descriptions (continued) Synchronization (Optional) The unit is capable of external synchronization from an independent time base with a switching rate of 256 khz. The amplitude of the synchronizing pulse train is TTL compatible and the duty cycle ranges between 4% and 6%. Synchronization is referenced to I(+). Thermal Considerations Introduction The LW2 Single-Output-Series power module operates in a variety of thermal environments; however, sufficient cooling should be provided to help ensure reliable operation of the unit. Heat-dissipating components inside the unit are thermally coupled to the case. Heat is removed by conduction, convection, and radiation to the surrounding environment. Proper cooling can be verified by measuring the case temperature. Peak case temperature (TC) occurs at the position indicated in Figure (1.6) ON/OFF NC Lucent TRIM IN LW2A81 OUT + DC-DC CONERTER + IN:DC 36-75, 1.1A OUT:DC 5., 4A MADE IN USA CASE PIN (OPTIONAL) 19.6 (.77) (C) Note: Dimensions are in millimeters and (inches). Pin locations are for reference only. Figure 15. Case Temperature Measurement Location Note that the view in Figure 15 is of the metal surface of the modulethe pin locations shown are for reference. The temperature at this location should not exceed the maximum case temperature indicated in the derating curve shown in Figure 16. The output power of the module should not exceed the rated power for the module as listed in the Ordering Information table. Heat Transfer Increasing airflow over the module enhances the heat transfer via convection. Figure 16 shows the maximum power that can be dissipated by the module without exceeding the maximum case temperature versus local ambient temperature (TA) for natural convection through 3. ms 1 (6 ft./min.). Systems in which these power modules may be used typically generate natural convection airflow rates of.3 ms 1 (6 ft./min.) due to other heat-dissipating components in the system. Therefore, the natural convection condition represents airflow rates of up to.3 ms 1 (6 ft./min.). Use of Figure 16 is shown in the following example. Example What is the minimum airflow necessary for a LW2A operating at I = 48, an output current of 3.6 A, and a maximum ambient temperature of 85 C? Solution: Given: I = 48, IO = 3.6 A, TA = 85 C Determine PD (Figure 18): PD = 4.5 W Determine airflow (Figure 16): v = 1. ms 1 (2 ft./min.) POWER DISSIPATION, PD (W) NATURAL CONECTION 1. ms 1 (2 ft./min.) 2. ms 1 (4 ft./min.) 3. ms 1 (6 ft./min.) MAX AMBIENT TEMPERATURE, TA ( C) MAX CASE TEMPERATURE Note: Conversion factor for linear feet per minute to meters per second: 2 ft./min. = 1 ms 1. Figure 16. Forced Convection Power Derating; Either Orientation (C).a Lucent Technologies Inc. 11

12 Thermal Considerations (continued) Heat Transfer (continued) POWER DISSIPATION, PD (W) Figure 17. LW2F and G Power Dissipation vs. Output Current, TA = 25 C POWER DISSIPATION, PD (W) I = 75 I = 48 I = 36 I = 36 I = 48 I = (C).a (C).a POWER DISSIPATION, PD (W) (C) Figure 19. LW2B Power Dissipation vs. Output Current, TA = 25 C POWER DISSIPATION, PD (W) I = (C) Figure 2. LW2C Power Dissipation vs. Output Current, TA = 25 C.8 I = 36 I = I = I = 36.8 I = Figure 18. LW2A Power Dissipation vs. Output Current 12 Lucent Technologies Inc.

13 Thermal Measurements The derating curves in Figure 16 were derived from measurements obtained in an experimental apparatus shown in Figure 21. Note that the module and the printed-wiring board (PWB) that it is mounted on are vertically oriented. The passage has a rectangular cross section. FACING PWB PWB MODULE AIR ELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE AIRFLOW 76 (3.) Note: Dimensions are in millimeters and (inches). 13 (.5) (C).d Figure 21. Experimental Test Setup Layout Considerations Copper paths must not be routed beneath the power module standoffs. Lucent Technologies Inc. 13

14 TU Rheinland Outline Diagram Dimensions are in millimeters and (inches). Copper paths must not be routed beneath the power module standoffs. Tolerances: x.x ±.5 mm (.2 in.), x.xx ±.25 mm (.1 in.). Pin-to-pin tolerances are not cumulative. Note: For standard modules, I(+) is internally connected to the case. Top iew Pin Function 5.8 (2.) 1 REMOTE ON/OFF Lucent TRIM 2 No Connection (sync feature optional) 5.8 (2.) ON/OFF NC IN LW2A81 + DC-DC CONERTER IN:DC 36-75, 1.1A OUT:DC 5., 4A OUT + 3 I( ) 4 I(+) 5 CASE Pin (pin optional) 6 TRIM MADE IN USA 7 O( ) 8 O(+) Side iew CASE PIN (OPTIONAL).38 ±.13 (.15 ±.5) 9.91 ±.38 (.39 ±.15) 4.7 (.185) MIN STANDOFFS 1.78 x.51 THICK (.7 x.2), 4 PLACES 1.2 (.4) DIA SOLDER-PLATED BRASS, ALL PINS Bottom iew 22.9 (.9) 5.8 (.2) 5.8 (.2) 5.8 (.2) 5.8 (.2) (.8) 1.16 (.4) 1.16 (.4) 2.5 (.1) ±.38 (1.8 ±.15) 2.5 (.1) REF (C).g 14 Lucent Technologies Inc.

15 Recommended Hole Pattern Component-side footprint. Dimensions are in millimeters and (inches). 2.5 (.1) 5.8 (2.) (1.8) 2.32 (.8) (.6) 12.7 (.5) 1.16 (.4) 5.8 (.2) 2.54 (.1) 7.62 (.3) 12.4 (.49) (.7) 5.8 (2.) 37.8 (1.49) 3.43 (.135) (1.53) CASE OUTLINE DRILL HOLE OF APPROX (.1) DIAMETER TO RECESS STANDOFFS IF LOWER HEIGHT IS NEEDED (C).g Ordering Information Table 4. Device Codes Input oltage Output oltage Output Power Device Code Comcode W LW2G W LW2F W LW2A W LW2B W LW2C Optional features may be ordered using the device code suffixes shown. To order more than one option, list suffixes in numerically descending order. Please contact your Lucent Technologies Network Products Group Account Manager or Application Engineer for pricing and availability of options. Table 5. Device Options Option Device Code Suffix Short pins: 2.79 mm ±.25 mm 8 (.11 in. ±.1 in.) Case ground pin 7 Short pins: 3.68 mm ±.25 mm 6 (.145 in. ±.1 in.) Synchronization 3 Negative remote on/off logic 1 Lucent Technologies Inc. 15

16 For additional information, contact your Lucent Technologies Account Manager or the following: POWER SYSTEMS UNIT: Network Products Group, Lucent Technologies Inc., 3 Skyline Drive, Mesquite, TX 75149, USA (Outside U.S.A.: , FAX ) (product-related questions or technical assistance) INTERNET: techsupport@lucent.com ASIA PACIFIC: Lucent Technologies Singapore Pte. Ltd., 75D Chai Chee Road #7-6, Chai Chee Industrial Park, Singapore 4694 Tel. (65) , FAX (65) CHINA: Lucent Technologies (China) Co. Ltd., SCITECH Place No. 22, Jian Guo Men Wai Avenue, Beijing 14, PRC JAPAN: Tel. (86) ext. 4187, FAX (86) Lucent Technologies Japan Ltd., Mori Building No. 21, 4-33, Roppongi 1-Chome, Minato-ku, Tokyo , Japan Tel. (81) , FAX (81) LATIN AMERICA: Lucent Technologies Inc., Room 416, 2333 Ponce de Leon Blvd., Coral Gables, FL 33134, USA Tel , FAX EUROPE: Data Requests: DATALINE: Tel. (44) , FAX (44) Technical Inquiries:GERMANY: (49) (Munich), UNITED KINGDOM: (44) (Ascot), FRANCE: (33) (Paris), SWEDEN: (46) (Stockholm), FINLAND: (358) (Helsinki), ITALY: (39) (Milan), SPAIN: (34) (Madrid) Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information. Copyright 2 Lucent Technologies Inc. Rights Reserved Printed in U.S.A. DS-58EPS (Replaces DS97-28EPS) Printed On Recycled Paper

LC/LW005-Series Power Modules: 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W

LC/LW005-Series Power Modules: 18 Vdc to 36 Vdc or 36 Vdc to 75 Vdc Inputs, 5 W Features The LC/LW005-Series Power Modules use advanced, surfacemount technology and deliver high-quality, compact, dc-dc conversion at an economical price. Applications Computer equipment Communications