LW025G

LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 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. Parameter Input Voltage: Continuous Transient (100 ms) Operating Case Temperature (See Thermal Considerations section.) Storage Temperature I/O Isolation Voltage (for 1 minute) Symbol Min Max Unit VI VI, trans TC 0 0 –40 80 100 110* Vdc V °C Tstg — –55 — 125 1500 °C Vdc * Maximum case temperature varies based on power dissipation. See derating curves, Figures 24—25, for details. Electrical Specifications Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. Table 1. Input Specifications Parameter Operating Input Voltage Maximum Input Current (VI = 0 V to VI, max; IO = IO, max; see Figures 1—3.) Inrush Transient Symbol VI II, max i2t Min 36 — Typ 48 — Max 75 1.2 Unit Vdc A — 3 0.1 — A2s mAp-p 60 — dB Input Reflected-ripple Current (50 Hz to 20 MHz; 12 µH source impedance, TC = 25 °C; see Figure 19.) II — — Input Ripple Rejection (100 Hz—120 Hz) — — 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 Tyco Electronics LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Electrical Specifications (continued) Table 2. Output Specifications Parameter Output Voltage Set Point (VI = 48 V; IO = IO, max; TC = 25 °C) Output Voltage (Over all line, load, and temperature conditions until end of life; see Figure 21.) Output Regulation: Line (VI = 36 V to 75 V) Load (IO = IO, min to IO, max) Temperature (TC = –40 °C to +100 °C) Output Ripple and Noise (See Figure 20.): RMS Peak-to-peak (5 Hz to 20 MHz) Output Current (At IO < IO, min, the modules may exceed output ripple and regulation specifications.) Output Current-limit Inception (VO = 90% x VO, set; see Figures 4—7.) Output Short-circuit Current (VO = 250 mV) Efficiency (VI = VI, nom; IO = IO, max; TC = 25 °C; see Figures 8—11 and 21.) Switching Frequency Dynamic Response (∆IO/∆t = 1 A/10 µs, VI = VI, nom, TA = 25 °C): Load Change from IO = 50% to 75% of IO, max: Peak Deviation Settling Time (VO < 10% peak deviation) Load Change from IO = 50% to 25% of IO, max: Peak Deviation Settling Time (VO < 10% peak deviation) Tyco Electronics Device Code Symbol or Suffix VO, set LW025D LW025G VO, set VO, set LW025F LW025A VO, set VO LW025D LW025G VO LW025F VO LW025A VO Min Typ Max Unit 1.97 2.46 3.25 4.92 2.0 2.5 3.3 5.0 2.03 2.54 3.35 5.08 Vdc Vdc Vdc Vdc 1.92 2.40 3.17 4.85 — — — — 2.08 2.60 3.43 5.15 Vdc Vdc Vdc Vdc A, D, F G D G A, F All — — — — — — — — — — — — 0.01 0.15 0.3 0.2 0.05 0.5 0.1 0.3 0.5 0.7 0.4 1.0 %VO %VO %VO %VO %VO %VO All All All — — IO — — 0.4 — 20 — 40 100 5.0 mVrms mVp-p A All IO 103 — 150 %IO, max D A, F, G LW025D LW025G LW025F LW025A All IO IO — — 150 135 220 200 η η η η — 67 70.5 75 77 — 69 73.25 77 79 256 — — — — — %IO, max %IO, max % % % % kHz D G A, F All — — — — — — — — 6 3 2 1 — — — — %VO, set %VO, set %VO, set ms D G A, F All — — — — — — — — 6 3 2 1 — — — — %VO, set %VO, set %VO, set ms 3 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Electrical Specifications (continued) Table 3. Isolation Specifications Parameter Isolation Capacitance Isolation Resistance Min — 10 Typ 0.002 — Max — — Unit µF MΩ Min Typ Max Unit — 3,900,000 — 54 (1.9) hours g (oz.) General Specifications Parameter Calculated MTBF (IO = 80% of IO, max; TC = 40 °C) Weight 4 Tyco Electronics Data Sheet March 22, 2000 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W 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 Remote On/Off Signal Interface: (VI = 0 V to VI, max; open collector or equivalent compatible; signal referenced to VI(–) terminal. See Figure 22 and Feature Descriptions.): Negative Logic: Device Code Suffix “1”: Logic Low—Module On Logic High—Module Off Positive Logic: If Device Code Suffix “1” Is Not Specified: Logic Low—Module Off Logic High—Module On Module Specifications: On/Off Current: Logic Low On/Off Voltage: Logic Low Logic High (Ion/off = 0) Open Collector Switch Specifications: Leakage Current During Logic High (Von/off = 10 V) Output Low Voltage During Logic Low (Ion/off = 1 mA) Turn-on Delay and Rise Times (at 80% 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 VI = 48 V until VO = 10% of VO, nom). Case 2: 48 V 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 VO = 10% of VO, nom). Output Voltage Rise Time (time for VO to rise from 10% of VO, nom to 90% of VO, nom) Output Voltage Overshoot (at 80% of IO, max; TA = 25 °C) Output Voltage Set-point Adjustment Range Output Overvoltage Protection (clamp) Tyco Electronics Device Symbol Min Typ Max Unit All Ion/off — — 1.0 mA All All Von/off Von/off –0.7 — — — 1.2 10 V V All Ion/off — — 50 µA All Von/off — — 1.2 V All Tdelay — 27 50 ms All Tdelay — 2 10 ms All Trise — 1.5 3.0 ms All — — — 5 % All LW025D LW025G LW025F LW025A — 90 2.6 2.9 3.9 5.6 — — — — — 110 3.5 3.8 5.0 7.0 %VO, nom V V V V VO, clamp VO, clamp VO, clamp VO, clamp 5 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Characteristics Curves 1.2 0.7 INPUT CURRENT, II (A) 1.0 INPUT CURRENT, II (A) 0.6 0.5 IO = 5.0 A IO = 2.6 A IO = 0.4 A 0.4 0.3 IO = 0.4 A IO = 2.5 A IO = 5 A 0.8 0.6 0.4 0.2 0.2 0.0 0.1 0 10 20 0.0 0 10 20 30 40 50 60 70 30 40 50 60 70 80 INPUT VOLTAGE, VI (V) 80 8-1982(C).b INPUT VOLTAGE, VI (V) Figure 3. LW025A Typical Input Characteristics 8-2560(C) Figure 1. LW025D, G Typical Input Characteristics 2.5 OUTPUT VOLTAGE, VO (V) 0.8 INPUT CURRENT, II (A) 0.7 0.6 IO = 0.4 A IO = 2.5 A IO = 5 A 0.5 0.4 0.3 2.0 1.5 1.0 VI = 75 V VI = 48 V VI = 36 V 0.5 0.2 0.0 0.1 0 0.0 0 10 20 30 40 50 60 70 80 1 2 3 4 5 6 7 8 9 OUTPUT CURRENT, IO (A) 8-2667(C) INPUT VOLTAGE, VI (V) 8-2233(C) Figure 4. LW025D Typical Output Characteristics Figure 2. LW025F Typical Input Characteristics 6 Tyco Electronics LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Characteristics Curves (continued) OUTPUT VOLTAGE, VO (V) 3.0 2.5 2.0 1.5 VI = 75 V VI = 48 V VI = 36 V 1.0 OUTPUT VOLTAGE, VO (V) 6 5 4 3 VI = 75 V VI = 48 V VI = 36 V 2 1 0 0.5 1 0 2 3 4 5 6 7 OUTPUT CURRENT, IO (A) 0.0 0 1 2 3 4 5 6 7 8 8-1983(C) 9 OUTPUT CURRENT, IO (A) Figure 7. LW025A Typical Output Characteristics 8-2666(C) Figure 5. LW025G Typical Output Characteristics 75 70 65 (%) 3.0 EFFICIENCY, OUTPUT VOLTAGE, VO (V) 3.5 2.5 2.0 60 55 VI = 75 V VI = 48 V VI = 36 V 50 45 40 1.5 35 1.0 VI = 75 V VI = 48 V VI = 36 V 0.5 30 0.4 1 2 3 4 1.4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 OUTPUT CURRENT, IO (A) 0.0 0 0.9 5 6 7 8 OUTPUT CURRENT, IO (A) 8-2234(C) 8-2650(C) Figure 8. LW025D Typical Converter Efficiency vs. Output Current Figure 6. LW025F Typical Output Characteristics Tyco Electronics 7 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Characteristics Curves (continued) 85 80 (%) 76 72 EFFICIENCY, (%) 74 EFFICIENCY, 70 68 66 60 62 60 0.4 VI = 36 V VI = 48 V VI = 75 V 70 65 VI = 75 V VI = 48 V VI = 36 V 64 75 0.5 0.9 1.4 1.9 2.4 2.9 3.4 3.9 4.4 8-2646(C) 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT CURRENT, IO (A) 4.9 OUTPUT CURRENT, IO (A) 1.0 8-1984(C) Figure 11. LW025A Typical Converter Efficiency vs. Output Current 78 76 EFFICIENCY, (%) 74 72 70 68 VI = 36 V VI = 48 V VI = 75 V 66 64 62 60 0.4 0.9 1.4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 OUTPUT CURRENT, IO (A) OUTPUT CURRENT, IO (A) (1.25 A/div) OUTPUT VOLTAGE, VO (V) Figure 9. LW025G Typical Converter Efficiency vs. Output Current 106% 100% 2.5 A 1.25 A 8-2478(C) Figure 10. LW025F Typical Converter Efficiency vs. Output Current TIME, t (100 µs/div) 8-1261(C).f Figure 12. LW025D Typical Output Voltage for a Step Load Change from 50% to 25% 8 Tyco Electronics LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 OUTPUT VOLTAGE, VO (V) 103% 100% OUTPUT CURRENT, IO (A) (1.25 A/div) OUTPUT CURRENT, IO (A) (1.25 A/div) OUTPUT VOLTAGE, VO (V) Characteristics Curves (continued) 2.5 A 100% 94% 3.75 A 2.5 A 1.25 A TIME, t (100 µs/div) 8-1262(C).f TIME, t (100 µs/div) 8-1261(C).g Figure 15. LW025D Typical Output Voltage for a Step Load Change from 50% to 75% OUTPUT VOLTAGE, VO (V) 102% 100% OUTPUT CURRENT, IO (A) (1.25 A/div) OUTPUT CURRENT, IO (A) (1.25 A/div) OUTPUT VOLTAGE, VO (V) Figure 13. LW025G Typical Output Voltage for a Step Load Change from 50% to 25% 2.5 A 100% 97% 3.75 A 2.5 A 1.25 A TIME, t (100 µs/div) 8-1262(C).g TIME, t (100 µs/div) 8-1261(C).h Figure 16. LW025G Typical Output Voltage for a Step Load Change from 50% to 75% Figure 14. LW025A, F Typical Output Voltage for a Step Load Change from 50% to 25% Tyco Electronics 9 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W OUTPUT VOLTAGE, VO (V) Characteristics Curves (continued) Data Sheet March 22, 2000 Test Configurations TO OSCILLOSCOPE CURRENT PROBE LTEST VI(+) 100% 12 µH 98% CS 220 µF IMPEDANCE < 0.1 Ω @ 20 °C, 100 kHz BATTERY 33 µF OUTPUT CURRENT, IO (A) (1.25 A/div) V I (–) 8-203(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. 3.75 A 2.5 A Figure 19. Input Reflected-Ripple Test Setup TIME, t (100 µs/div) 8-1262(C).h Figure 17. LW025A, F Typical Output Voltage for a Step Load Change from 50% to 75% COPPER STRIP VO(+) 0.1 µF SCOPE RESISTIVE LOAD REMOTE ON/OFF, Von/off (V) (2 V/div) VO(–) 8-513(C) Note: Use a 0.1 µF ceramic capacitor. Scope measurement should be made using a BNC socket. Position the load between 50 mm and 75 mm (2 in. and 3 in.) from the module. 5V Figure 20. Peak-to-Peak Output Noise Measurement Test Setup NORMALIZED OUTPUT VOLTAGE, VO 0 CONTACT AND DISTRIBUTION LOSSES V I (+) V O (+) II IO LOAD SUPPLY 0 V I (–) V O (–) CONTACT RESISTANCE TIME, t (1 ms/div) 8-204(C) 8-1263(C).e Figure 18. LW025A, D, F, G Typical Output Voltage Start-Up when Signal Is Applied to Remote On/Off Note: All measurements are taken at the module terminals. When socketing, place Kelvin connections at module terminals to avoid measurement errors due to socket contact resistance. [ V O (+) – V O (–) ]I O η =  ------------------------------------------------ × 100  [ V I (+) – V I (–) ]I I  % Figure 21. Output Voltage and Efficiency Measurement Test Setup 10 Tyco Electronics Data Sheet March 22, 2000 Design Considerations Grounding Considerations For modules without the isolated case ground pin option, the case is internally connected to the VI(+) pin. For modules with the isolated case ground pin, device code suffix “7,” the VI(+) pin is not connected to the case. 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 19, a 33 µF electrolytic capacitor (ESR < 0.7 Ω at 100 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 1950, CSA C22.2 No. 950-95, and VDE 0805 (EN60950, IEC950). If the input source is non-SELV (ELV or a hazardous voltage greater than 60 Vdc and less than or equal to 75 Vdc), for the module's output to be considered meeting the requirements of safety extra-low voltage (SELV), all of the following must be true: LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Note: Do not ground either of the input pins of the module without grounding one of the output pins. This may allow a non-SELV voltage to appear between the output pins and ground. The power module has extra-low voltage (ELV) outputs when all inputs are ELV. 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. 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, device code suffix “1,” remote on/off 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 VI(–) terminal (Von/off). The switch can be an open collector or equivalent (see Figure 22). A logic low is Von/off = –0.7 V to +1.2 V. The maximum Ion/off during a logic low is 1 mA. The switch should maintain a logic-low voltage while sinking 1 mA. ■ The input source is to be provided with reinforced insulation from any other hazardous voltages, including the ac mains; and ■ One VI pin and one VO pin are to be grounded or both the input and output pins are to be kept floating; and ■ The input pins of the module are not operator accessible; and During a logic high, the maximum Von/off generated by the power module is 6 V. The maximum allowable leakage current of the switch at Von/off = 6 V is 50 µA. ■ Another SELV 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. 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. Tyco Electronics 11 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Feature Descriptions (continued) Remote On/Off (continued) VI(+) VI(–) – Von/off + REMOTE ON/OFF Ion/off 8-758(C).a Figure 22. Remote On/Off Implementation Output Voltage 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 VO(+) or VO(–) pins. With an external resistor between the TRIM and VO(+) pins (Radj-down), the output voltage set point (VO, adj) decreases. With an external resistor between the TRIM pin and VO(–) pin (Radj-up), VO, adj increases. The following equations determine the required external resistor value to obtain an output voltage change of ∆%: c [ d ⋅ ( 1 – ∆% ) – 1 ] R adj-down = ------------------------------------------------ – b kΩ ∆% a R adj-up = ----------------- – b kΩ d ⋅ ∆% Device a b c d –5% VO Radj-down +5% VO Radj-up LW025D LW025G LW025F LW025A 5.11 14.0 14.0 4.02 2.05 51.1 51.1 16.9 3.13 6.86 5.2 2.01 1.63 2.04 2.7 2.0 32.3 kΩ 77.6 kΩ 111.7 kΩ 19.3 kΩ 60.6 kΩ 86.2 kΩ 52.7 kΩ 23.3 kΩ The adjusted output voltage cannot exceed 110% of the nominal output voltage between the VO(+) and VO(–) 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. 12 Tyco Electronics Data Sheet March 22, 2000 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Feature Descriptions (continued) 26.9 (1.06) Output Overvoltage Protection tyco 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 VO, clamp, max. This provides a redundant voltage-control that reduces the risk of output overvoltage. TRIM ON/OFF 19.6 (0.77) – NC LW025A871 OUT – DC-DC CONVERTER IN IN:DC 36-75V, 1.20A + + OUT:DC 5.0V, 5.0A MADE IN USA VDE TUV Rheinland CASE PIN (OPTIONAL) 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 40% and 60%. Synchronization is referenced to VI(+). Thermal Considerations Introduction The LW025 Single-Output-Series Power Modules operate 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 23. 8-1265(C).c Note: Dimensions are in millimeters and (inches). Pin locations are for reference only. Figure 23. Case Temperature Measurement Location Note that the view in Figure 23 is of the metal surface of the module—the pin locations shown are for reference. The temperature at this location should not exceed the maximum case temperature indicated in the derating curves shown in Figures 24—25. 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. Figures 24—25 show the maximum power that can be dissipated by the modules without exceeding the maximum case temperature versus local ambient temperature (TA) for natural convection through 3.0 ms–1 (600 ft./min.). Systems in which these power modules may be used typically generate natural convection airflow rates of 0.3 ms–1 (60 ft./min.) due to other heat-dissipating components in the system. Therefore, the natural convection condition represents airflow rates of up to 0.3 ms–1 (60 ft./min.). Use of Figure 25 is shown in the following example. Example What is the minimum airflow necessary for a LW025A operating at VI = 75 V, an output current of 3.5 A, and a maximum ambient temperature of 85 °C? Tyco Electronics 13 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Thermal Considerations (continued) 6 POWER DISSIPATION, PD (W) Heat Transfer (continued) Solution Given: VI = 75 V, IO = 3.5 A, TA = 85 °C Determine PD (Figure 29): PD = 4.5 W Determine airflow (Figure 25): v = 1.0 ms–1 (200 ft./min.) 3 VI = 36 V VI = 48 V VI = 75 V 2 1 0.9 1.4 4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 OUTPUT CURRENT, IO (A) 8-2649(C) 3 2 1 0 40 MAX CASE TEMPERATURE 3.0 ms –1 (600 ft./min.) 2.0 ms –1 (400 ft./min.) 1.0 ms –1 (200 ft./min.) NATURAL CONVECTION Figure 26. LW025D Power Dissipation vs. Output Current 6 50 60 70 80 90 100 110 MAX AMBIENT TEMPERATURE, TA (°C) 8-2477(C) Note: Conversion factor for linear feet per minute to meters per second: 200 ft./min. = 1 ms–1. Figure 24. LW025D, F, G Forced Convection Power Derating; Either Orientation 5 4 3 8 MAX CASE TEMPERATURE VI = 75 V VI = 48 V VI = 36 V 2 1 0 0.4 9 POWER DISSIPATION, PD (W) 4 0 0.4 POWER DISSIPATION, PD (W) POWER DISSIPATION, PD (W) 5 5 0.9 1.4 1.9 2.4 2.9 3.4 3.9 4.4 4.9 OUTPUT CURRENT, IO (A) 8-2645(C) 7 6 Figure 27. LW025G Power Dissipation vs. Output Current 5 4 3 2 1 0 40 NATURAL CONVECTION 1.0 ms–1 (200 ft./min.) 2.0 ms–1 (400 ft./min.) 3.0 ms–1 (600 ft./min.) 50 60 70 80 90 100 110 MAX AMBIENT TEMPERATURE, TA (°C) 8-1985(C) Note: Conversion factor for linear feet per minute to meters per second: 200 ft./min. = 1 ms–1. Figure 25. LW025A Forced Convection Power Derating; Either Orientation 14 Tyco Electronics LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Thermal Considerations (continued) Module Derating Heat Transfer (continued) The derating curves in Figures 24—25 were determined from measurements obtained in an experimental apparatus shown in Figure 30. 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. POWER DISSIPATION, PD (W) 6 5 4 FACING PWB 3 PWB 2 VI = 75 V VI = 48 V VI = 36 V 1 0 0.4 0.9 1.4 1.9 2.4 2.9 MODULE 3.4 3.9 4.4 4.9 OUTPUT CURRENT, IO (A) 8-2479(C) Figure 28. LW025F Power Dissipation vs. Output Current, TA = 25 °C AIR VELOCITY AND AMBIENT TEMPERATURE MEASURED BELOW THE MODULE POWER DISSIPATION, PD (W) 8 AIRFLOW 76 (3.0) 7 6 VI = 75 V VI = 48 V VI = 36 V 5 13 (0.5) 8-1126(C).d 4 Note: Dimensions are in millimeters and (inches). 3 Figure 30. Experimental Test Setup 2 1 0 0.5 Layout Considerations 1 1.5 2 2.5 3 3.5 4 4.5 5 OUTPUT CURRENT, IO (A) 8-1888(C).a Copper paths must not be routed beneath the power module standoffs. Figure 29. LW025A Power Dissipation vs. Output Current, TA = 25 °C Tyco Electronics 15 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Outline Diagram Dimensions are in millimeters and (inches). Tolerances: x.x ± 0.5 mm (0.02 in.), x.xx ± 0.25 mm (0.010 in.). Pin-to-pin tolerances are not cumulative. Note: For standard modules, VI(+) is internally connected to the case. Top View 50.8 (2.00) tyco 50.8 (2.00) – IN + Function 1 Remote On/Off 2 No Connection (sync feature optional) TRIM ON/OFF NC Pin LW025A871 DC-DC CONVERTER IN:DC 36-75V, 1.20A OUT:DC 5.0V, 5.0A 3 VI(–) 4 VI(+) 5 Case Pin (pin optional) 6 Trim 7 – Output 8 + Output – OUT + MADE IN USA VDE TUV Rheinland CASE PIN (OPTIONAL) Side View 0.38 ± 0.13 (0.015 ± 0.005) 9.91 ± 0.38 (0.390 ± 0.015) Bottom View 1.02 (0.040) DIA SOLDER-PLATED BRASS, ALL PINS STANDOFFS 1.78 x 0.51 THICK (0.070 x 0.020), 4 PLACES 4.70 (0.185) MIN 22.9 (0.90) 5.08 (0.200) 20.3 (0.80) 5 8 4 5.08 (0.200) 5.08 (0.200) 10.16 (0.400) 3 7 2 1 10.16 (0.400) 5.08 (0.200) 2.5 (0.10) 6 45.72 ± 0.38 (1.800 ± 0.015) 2.5 (0.10) REF 8-1198(C).f 16 Tyco Electronics LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Recommended Hole Pattern Component-side footprint. Dimensions are in millimeters and (inches). 2.5 (0.10) 12.7 (0.50) 20.32 (0.800) 15.24 (0.600) 50.8 50.8 (2.00) (2.00) 45.72 (1.800) 12.4 (0.49) 5.08 (0.200) 2.54 (0.100) 50.8 (2.00) 7.62 (0.300) 10.16 (0.400) 17.78 (0.700) 37.8 (1.49) 3.43 (0.135) 38.86 (1.530) CASE OUTLINE DRILL HOLE OF APPROX. 2.54 (0.100) DIAMETER TO RECESS STANDOFFS IF LOWER HEIGHT IS NEEDED 8-1198(C).f Ordering Information Table 4. Device Codes Input Voltage 48 V 48 V 48 V 48 V Output Voltage 2.0 V 2.5 V 3.3 V 5V Output Power 10 W 12.5 W 16.5 W 25 W Device Code LW025D LW025G LW025F LW025A Comcode 108413477 108485145 108448234 TBD Optional features may be ordered using the device code suffixes shown below. To order more than one option, list suffixes in numerically descending order. Please contact your Tyco Electronics Account Manager or Application Engineer for pricing and availability of options. Table 5. Option Codes Option Short pins: 2.79 mm ± 0.25 mm (0.110 in. ± 0.010 in.) Case ground pin Short pins: 3.68 mm ± 0.25 mm (0.145 in. ± 0.010 in.) Synchronization Negative logic on/off Tyco Electronics Device Code Suffix 8 7 6 3 1 17 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 Notes 18 Tyco Electronics Data Sheet March 22, 2000 Tyco Electronics LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W 19 LW025 Single-Output-Series Power Modules: 36 Vdc to 75 Vdc Inputs; 25 W Data Sheet March 22, 2000 For additional information, contact your Lucent Technologies Account Manager or the following: POWER SYSTEMS UNIT: Network Products Group, Lucent Technologies Inc., 3000 Skyline Drive, Mesquite, TX 75149, USA +1-800-526-7819 (Outside U.S.A.: +1-972-284-2626, FAX +1-888-315-5182) (product-related questions or technical assistance) INTERNET: http://www.lucent.com/networks/power E-MAIL: techsupport@lucent.com ASIA PACIFIC: Lucent Technologies Singapore Pte. Ltd., 750D Chai Chee Road #07-06, Chai Chee Industrial Park, Singapore 469004 Tel. (65) 240 8041, FAX (65) 240 8438 CHINA: Lucent Technologies (China) Co. Ltd., SCITECH Place No. 22, Jian Guo Men Wai Avenue, Beijing 100004, PRC Tel. (86) 10-6522 5566 ext. 4187, FAX (86) 10-6512 3634 JAPAN: Lucent Technologies Japan Ltd., Mori Building No. 21, 4-33, Roppongi 1-Chome, Minato-ku, Tokyo 106-8508, Japan Tel. (81) 3 5561 5831, FAX (81) 3 5561 1616 LATIN AMERICA: Lucent Technologies Inc., Room 416, 2333 Ponce de Leon Blvd., Coral Gables, FL 33134, USA Tel. +1-305-569-4722, FAX +1-305-569-3820 EUROPE: Data Requests: DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148 Technical Inquiries:GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot), FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 91 807 1441 (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 © 2000 Lucent Technologies Inc. All Rights Reserved Printed in U.S.A. March 22, 2000 DS99-393EPS (Replaces DS98-052EPS) Printed On Recycled Paper