Data Sheet April 2008 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Options n Isolated case pin n Higher accuracy output voltage clamp set point n The CW025 Dual Output-Series Power Modules use advanced, surface-mount technology and deliver high-quality, compact, dc-dc conversion at an economical price. Features n Small size: 71.1 mm x 61.0 mm x 12.7 mm (2.80 in. x 2.40 in. x 0.50 in.) n Low output noise n Industry-standard pinout n Metal case n 2:1 input voltage range n Remote on/off (positive logic) n n n n UL* Recognized, CSA Certified, and VDE Licensed Short pin: 2.79 mm 0.25 mm (0.110 in. 0.010 in.) n Heat sink available for extended operation n Negative logic remote on/off Description The CW025 Dual Output-Series Power Modules are a family of dc-dc converters that operate over an input voltage range of 36 Vdc to 75 Vdc and provide two regulated outputs. These modules offer low noise levels with industry-standard pinouts in a small footprint. Each highly reliable and efficient unit features remote on/off and current limit. Each output is individually regulated by its own control circuit and has an independent overvoltage clamp. With standard outputs of 5 V, 12 V, and 15 V, the CW025 Dual Output-Series is flexible enough to provide modified standard units with any combination of output voltages from 2 V to 15 V. Efficiency greater than 80%, a wide operating temperature range, and a metal case are additional features of these modules. Within FCC and CISPR Class A Radiated Limits CE mark meets 73/23/EEC and 93/68/EEC directives Two tightly regulated outputs Applications n Distributed power architectures n Telecommunications * UL is a registered trademark of Underwriters Laboratories, Inc. CSA is a registered trademark of Canadian Standards Association. This product is intended for integration into end-use equipment. All the required procedures for CE marking of end-use equipment should be followed. (The CE mark is placed on selected products.) CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Absolute Maximum Ratings Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Symbol Min Max Unit VI VI, trans -- -- 80 100 Vdc V I/O Isolation Voltage dc Transient (1 minute) -- -- -- -- 500 850 V V Operating Case Temperature TC - 40 100 C Storage Temperature Tstg - 55 125 C Input Voltage Continuous Transient (10 ms) 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 VI 36 48 75 Vdc II, max -- -- 2.0 A Inrush Transient i2 t -- -- 0.8 A2s Input Reflected-ripple Current, Peak-to-peak (5 Hz to 20 MHz, 12 H source impedance; TC = 25 C; see Figure 11 and Design Considerations section.) -- -- 25 -- mAp-p Input Ripple Rejection (120 Hz) -- -- 60 -- dB Operating Input Voltage Maximum Input Current (VI = 0 V to 75 V; IO = IO, max; see Figure 1.) 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, dc 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 Lineage Power CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Electrical Specifications (continued) Table 2. Output Specifications Parameter Output Voltage (Over all operating input voltage, resistive load, and temperature conditions until end of life. See Figure 11.) Output Voltage Set Point (VI = 48 V; IO = IO, max; TC = 25 C) Device Symbol Min Typ Max Unit CW025AJ-M VO1 VO2 VO1 VO2 VO1 VO2 4.80 -4.80 11.40 -11.40 14.25 -14.25 -- -- -- -- -- -- 5.25 -5.25 12.60 -12.60 15.75 -15.75 Vdc Vdc Vdc Vdc Vdc Vdc VO1, set VO2, set VO1, set VO2, set VO1, set VO2, set 4.90 -4.90 11.76 -11.76 14.70 -14.70 5.0 -5.0 12.0 -12.0 15.0 -15.0 5.10 -5.10 12.24 -12.24 15.30 -15.30 Vdc Vdc Vdc Vdc Vdc Vdc -- -- -- -- -- -- -- -- -- -- -- -- 0.1 0.1 0.1 15 40 40 0.2 0.4 0.4 70 150 190 % % % mV mV mV -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 15 20 25 150 200 250 mVrm s mVrm s mVrm s mVp-p mVp-p mVp-p IO1 IO2 IO1 IO2 IO1 IO2 0.20 0.20 0.10 0.10 0.08 0.08 -- -- -- -- -- -- 2.50 2.50 1.04 1.04 0.83 0.83 A A A A A A CW025BK-M CW025CL-M CW025AJ-M CW025BK-M CW025CL-M Output Regulation: Line (VI = 36 V to 75 V) Load (IO1 = IO, min to IO, max, IO2 = IO, max) Load (IO2 = IO, min to IO, max, IO1 = IO, max) Temperature (TC = - 40 C to +100 C) All All All CW025AJ-M CW025BK-M CW025CL-M Output Ripple and Noise (See Figure 12.): RMS Peak-to-peak (5 Hz to 20 MHz) Output Current (At IO < IO, min, the modules may exceed output ripple specifications.) CW025AJ-M CW025BK-M CW025CL-M CW025AJ-M CW025BK-M CW025CL-M CW025AJ-M CW025BK-M CW025CL-M Output Current-limit Inception (VO = 90% of VO, nom; see Figure 2.) CW025AJ-M CW025BK-M CW025CL-M -- -- -- -- -- -- 3.7 1.5 1.3 6.5 2.9 2.7 A A A Output Short-circuit Current (VO = 250 mV) CW025AJ-M CW025BK-M CW025CL-M -- -- -- -- -- -- 3.5 1.0 1.0 7.0 3.0 3.0 A A A Efficiency (VI = 48 V; IO = IO, max; TC = 25 C; see Figures 3 and 11.) CW025AJ-M CW025BK-M CW025CL-M 75 79 79 78 82 82 -- -- -- % % % Lineage Power 3 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Electrical Specifications (continued) Table 2. Output Specifications (continued) Parameter Dynamic Response (yIO/yt = 1 A/10 s, VI = 48 V, TC = 25 C): Load Change from IO = 50% to 75% of IO, max (See Figures 7 to 9.): Peak Deviation Settling Time (VO < 10% peak deviation) Load Change from IO = 50% to 25% of IO, max (See Figures 4 to 6.): Peak Deviation Settling Time (VO < 10% peak deviation) Device Symbol Min Typ Max Unit CW025AJ-M CW025BK-M CW025CL-M All -- -- -- -- -- -- -- -- 160 250 250 3 -- -- -- -- mV mV mV ms CW025AJ-M CW025BK-M CW025CL-M All -- -- -- -- -- -- -- -- 160 250 250 0.5 -- -- -- -- mV mV mV ms Table 3. Isolation Specifications Min Typ Max Unit Isolation Capacitance Parameter -- 1200 -- pF Isolation Resistance 10 -- -- M3/4 General Specifications Parameter Min Calculated MTBF (IO = 80% of IO, max; TC = 40 C) Weight 4 Typ Max Unit 2,800,000 -- -- hours 113 (4.0) g (oz.) Lineage Power CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 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 (VI = 0 V to 75 V; open collector or equivalent compatible; signal referenced to VI(-) terminal. See Figures 10 and 14 and Feature Descriptions.): CW025xx-M Positive Logic: Logic Low--Module Off Logic High--Module On CW025xx1-M Negative Logic: Logic Low--Module On Logic High--Module Off 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 Time (IO = 80% of IO, max; VO within 1% of steady state) Output Voltage Overshoot Output Overvoltage Clamp Device Symbol Min Typ Max Unit All Ion/off -- -- 1.0 mA All All Von/off Von/off 0 -- -- -- 1.2 10 V V All Ion/off -- -- 50 A All Von/off -- -- 1.2 V All -- -- 30 -- ms All -- -- 0 5 % CW025AJ VO1 VO2 VO1 VO2 VO1 VO2 -- -- -- -- -- -- -- -- -- -- -- -- 7 -7 16 -16 20 -20 V V V V V V VUVLO VUVLO -- 20 28 28 36 -- V V CW025BK CW025CL Input Undervoltage Lockout: Module On Module Off Lineage Power All All 5 Data Sheet April 2008 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Characteristic Curves 90 1.0 VO 0.8 0.8 0.6 0.6 II 0.4 0.4 0.2 0.2 0 0.0 0 10 20 30 40 50 60 (%) 1.0 EFFICIENCY, 1.2 NORMALIZED OUTPUT VOLTAGE INPUT CURRENT, II (A) 85 1.2 80 75 CW025AJ CW025BK CW025CL 70 85 60 55 50 0.1 70 0.2 0.3 0.4 0.5 0.6 0.7 0.8 8-1021(C) 8-993(C).b OUTPUT VOLTAGE, VO (mV) (50 mV/div) 1.1 1.0 0.9 0.8 0.7 CW025CL CW025BK CW025AJ 0.4 0.3 50 mV 5.0 V 0.2 0.1 0.0 0.0 Figure 3. CW025 Dual Output-Series Efficiency vs. Normalized Output Currents (Equal Load on Both Outputs) at VI = 48 V and TC = 25 C 0.4 0.8 1.2 1.6 2.0 2.4 OUTPUT CURRENTS NORMALIZED TO FULL LOAD 8-1022(C) Figure 2. CW025 Dual Output-Series Normalized Output Current vs. Normalized Output Voltage at VI = 48 V and TC = 25 C OUTPUT CURRENT, IO (A) (0.5 A/div) NORMALIZED OUTPUT VOLTAGE, VO (V) Figure 1. CW025 Dual Output-Series Input Current and Normalized Output Voltage vs. Input Voltage at Full Load and TC = 25 C 0.5 1.0 OUTPUT CURRENTS NORMALIZED TO FULL LOAD INPUT VOLTAGE, VI (V) 0.6 0.9 1.0 A IO = 1 A/10 s t 0.5 A 0.5 ms 0.5 A TIME, t (0.5 ms/div) 8-1019(C) Figure 4. CW025 Dual Output-Series Typical 5 V Output Voltage Response to a Step Load Change from 50% to 25% of IO, max at VI = VI, nom and TC = 25 C 6 Lineage Power Data Sheet April 2008 CW025 Dual Output-Series Power Modules: 33 36 Vdc to 75 Vdc Input; 25 W OUTPUT CURRENT, IO (A) OUTPUT VOLTAGE, VO (mV) (0.5 A/div) (50 mV/div) OUTPUT CURRENT, IO (A) (0.2 A/div) OUTPUT VOLTAGE, VO (V) (0.1 V/div) Characteristic Curves (continued) 100 mV 12.0 V 0.416 A IO = 1 A/10 s t 0.208 A 0.2 A 50 mV 5.0 V 1.5 A IO = 1 A/10 s t 1.0 A 0.5 ms 0.5 A 0.5 ms TIME, t (0.5 ms/div) 8-1018(C) TIME, t (0.5 ms/div) 8-1017(C) OUTPUT VOLTAGE, VO (0.1 V/div) 100 mV 100 mV 12.0 V 15.0 V 0.333 A OUTPUT CURRENT, IO (0.2 A/div) OUTPUT CURRENT, IO (0.2 A/div) OUTPUT VOLTAGE, VO (0.1 V/div) Figure 5. CW025 Dual Output-Series Typical 12 V Output Voltage Response to a Step Load Change from 50% to 25% of IO, max at VI = VI, nom and TC = 25 C Figure 7. CW025 Dual Output-Series Typical 5 V Output Voltage Response to a Step Load Change from 50% to 75% of IO, max at VI = VI, nom and TC = 25 C IO = 1 A/10 s t 0.166 A 0.2 A 0.624 A 0.416 A IO = 1 A/10 s t 0.2 A 0.5 ms 0.5 ms TIME, t (0.5 ms/div) 8-519(C) TIME, t (0.5 ms/div) 8-527(C) Figure 6. CW025 Dual Output-Series Typical 15 V Output Voltage Response to a Step Load Change from 50% to 25% of IO, max at VI = VI, nom and TC = 25 C Lineage Power Figure 8. CW025 Dual Output-Series Typical 12 V Output Voltage Response to a Step Load Change from 50% to 75% of IO, max at VI = VI, nom and TC = 25 C 7 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W OUTPUT CURRENT, IO (0.2 A/div) OUTPUT VOLTAGE, VO (0.1 V/div) Characteristic Curves (continued) Data Sheet April 2008 Test Configurations TO OSCILLOSCOPE 100 mV LTEST CURRENT PROBE 15.0 V V I (+) 12 H BATTERY 0.500 A CS 220 F IMPEDANCE < 0.1 @ 20 C, 100 kHz IO t = 1 A/10 s V I (-) 0.333 A 8-489(C) 0.2 A Note: Input reflected-ripple current is measured with a simulated source impedance (LTEST) of 12 H. Capacitor CS offsets possible battery impedance. Current is measured at the input of the module. 0.5 ms TIME, t (0.5 ms/div) 8-526(C) Figure 11. Input Reflected-Ripple Test Setup Figure 9. CW025 Dual Output-Series Typical 15 V Output Voltage Response to a Step Load Change from 50% to 75% of IO, max at VI = VI, nom and TC = 25 C COPPER STRIP NORMALIZED OUTPUT VOLTAGE, VO VO1(+) SCOPE RLOAD1 0.1 F SCOPE RLOAD2 COMM VO, set VO2(-) 8-808(C) 0V REMOTE ON/OFF, Von/off (V) (2 V/div) 0.1 F 2V 0V Note: Use a 0.1 F ceramic capacitor. Scope measurement should be made using a BNC socket. Position the load between 50 mm (2 in.) and 75 mm (3 in.) from the module. IO = 1 A/10 s t Figure 12. Output Noise Measurement Test Setup 1 ms TIME, t (1 ms/div) 8-1020(C) Figure 10. CW025 Dual Output-Series Typical Output Voltage Rise Time with Remote On/Off at VI = VI, nom, IO = 0.8 (IO, max) and TC = 25 C 8 Lineage Power Data Sheet April 2008 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Test Configurations (continued) Safety Considerations CONTACT AND DISTRIBUTION LOSSES VI(+) VO1 IO II LOAD COM SUPPLY LOAD VO2 VI(-) CONTACT RESISTANCE 8-863(C).a 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. 2 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 22.2-950, EN60950. [ VOJ - COM ]IOJ J=1 = ----------------------------------------------------------------x 100 [ VI ( + ) - VI ( - ) ]II Figure 13. Output Voltage and Efficiency Measurement Test Setup For the converter output to be considered meeting the requirements of safety extra-low voltage (SELV), one of the following must be true of the dc input: All inputs are SELV and floating with the output also floating. All inputs are SELV and grounded with the output also grounded. Any non-SELV input must be provided with reinforced insulation from any other hazardous voltages, including the ac mains, and must have an SELV reliability test performed on it in combination with the converters. 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. Design Considerations Grounding Considerations For modules without the isolated case ground pin option, the case is internally connected to the VI(+) pin. Input Source Impedance Input/Output Voltage Reversal CAUTION: Applying a reverse voltage across the module input or output forward biases an internal diode. Attempting to start the module under this condition can damage the module. The power module should be connected to a low acimpedance input source. Highly inductive source impedances can affect the stability of the power module. A 33 F electrolytic capacitor (ESR < 0.7 at 100 kHz) mounted close to the power module helps ensure stability of the unit. Note: VI(+) is internally connected to the case for a standard module. Lineage Power 9 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Feature Descriptions Remote On/Off Output Overvoltage Clamp 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, code suffix "1," turns the module off during a logic high and on during a logic low. 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 clamp has a higher voltage set point than the primary loop (see Feature Specifications table). This provides a redundant voltage control that reduces the risk of output overvoltage. Current Limit To provide protection in a fault (output overload) condition, the unit is equipped with internal currentlimiting 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. 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 14). A logic low is Von/off = 0 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. During a logic high, the maximum Von/off generated by the power module is 10 V. The maximum allowable leakage current of the switch at Von/off = 10 V is 50 A. VI(+) VI(-) - VO1 LOAD Von/off COM + Ion/off LOAD ON/OFF VO2 8-754(C) Figure 14. Remote On/Off Implementation 10 Lineage Power CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Thermal Considerations WIND TUNNEL WALL MEASURE CASE TEMPERATURE AT CENTER OF UNIT AIRFLOW CONNECTORS TO LOADS, POWER SUPPLIES, AND DATALOGGER, 6.35 (0.25) TALL 203.2 (8.00) AIRFLOW 50.8 (2.00) 101.6 (4.00) AIR VELOCITY PROBE AMBIENT TEMPERATURE THERMOCOUPLE 12.7 (0.50) 203.2 (8.00) 9.7 (0.38) 19.1 (0.75) 8-866(C).a Note: Dimensions are in millimeters and (inches). Drawing is not to scale. Figure 15. Thermal Test Setup The 25 W dual output power modules are designed to operate in a variety of thermal environments. As with any electronic component, sufficient cooling must be provided to help ensure reliable operation of the unit. Heat-dissipating components inside the module are thermally coupled to the case. Heat is removed by conduction, convection, and radiation to the surrounding environment. The thermal data presented is based on measurements taken in a wind tunnel. The test setup shown in Figure 15 was used to collect data. Actual performance can vary depending on the particular application environment. Basic Thermal Performance The CW025 Dual Output-Series Power Modules have a separate power stage for each of the outputs. This means that the maximum operating temperature can be predicted quite closely by treating each output individually and then summing the results. Figures 16 through 19 are used to predict the safe operating condition for many different operating and environmental conditions. The method used to determine the maximum ambient temperature at a given air velocity is a four-step process: 1. 2. 3. 4. Lineage Power Find the power dissipated for output 1 by using the appropriate chart (Figures 16 through 18) for a particular output condition (IO1). Repeat step 1 for output 2 using Figures 16 through 18. Find the total power dissipated by summing the power dissipated on each of the outputs: (PDout1 + PDout2) = PDtotal Use the total power dissipated with Figure 19 to determine the maximum ambient temperature at different air velocities. 11 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Thermal Considerations (continued) Basic Thermal Performance (continued) For example, the CW025AJ-M power module with a 54 V input and 2.5 A output on VO1 and a 1.5 A output on VO2 will have a power dissipated of 3.6 W (from Figure 16) plus 2.1 W (from Figure 16) or 5.7 W total. Using Figure 19, it can be determined that the maximum ambient temperature at natural convection that the CW025AJ-M can operate at is approximately 62 C. Keep in mind that these are approximations of the air temperature and velocity required to keep the case temperature below its maximum rating. The maximum case temperature at the point shown in Figure 15 must be kept at 100 C or less. POWER DISSIPATION, PD (W) 4.0 3.5 3.0 VI = 72 V VI = 54 V VI = 36 V 2.5 2.0 1.5 1.0 0.5 0 0 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT, IO (A) 8-987a(C) Figure 16. 5 V Output Power Dissipation vs. Output Current Air Velocity T C, max - T A CA = --------------------------------P D total where CA is the thermal resistance from case-to-ambient air (C/W), TC, max is the desired maximum case temperature (C), TA is the ambient inlet temperature (C), and PDtotal is the total power dissipated from the module (W). For example, to maintain a maximum case temperature of 85 C with an ambient inlet temperature of 55 C and a power dissipation of 6.7 W, the thermal resistance is: 85 C - 55 C CA ---------------------------------- = 4.5 C W 6.7 W 3.0 POWER DISSIPATION, PD (W) The air velocity required to maintain a desired maximum case temperature for a given power dissipation and ambient temperature can be calculated by using Figure 19 and the following equation: 2.5 2.0 1.5 VI = 36 V VI = 54 V VI = 72 V 1.0 0.5 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 OUTPUT CURRENT, IO (A) 8-1000(C) Figure 17. 12 V Output Power Dissipation vs. Output Current This corresponds to an air velocity greater than 0.46 ms-1 (90 fpm) in Figure 19. 12 Lineage Power Data Sheet April 2008 CW025 Dual Output-Series Power Modules: to 75 Vdc Input; 25 W 3 36Vdc 3 Thermal Considerations (continued) 7.0 THERMAL RESISTANCE CASE TO AMBIENT (C/W) Air Velocity (continued) POWER DISSIPATION, PD (W) 3.0 2.5 2.0 1.5 VI = 36 V VI = 54 V VI = 72 V 1.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 NAT 0.25 CONV (50) 0.51 0.76 (100) (150) 1.02 (200) 1.27 1.52 1.78 2.03 (250) (300) (350) (400) VELOCITY ms -1 (ft./min.) 0.5 8-989(C) 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 OUTPUT CURRENT, IO (A) Figure 20. Case-to-Ambient Thermal Resistance vs. Air Velocity 8-999(C) Use of Heat Sinks and Cold Plates TOTAL POWER DISSIPATION, PD (W) Figure 18. 15 V Output Power Dissipation vs. Output Current The CW025 Dual Output-Series case includes throughthreaded M3 x 0.5 mounting holes allowing attachment of heat sinks or cold plates from either side of the module. The mounting torque must not exceed 0.56 N/m (5 in-lb.). 10.0 9.0 The following thermal model can be used to determine the required thermal resistance of the sink to provide the necessary cooling: 8.0 7.0 6.0 5.0 PD 50 60 l CS 0.0 40 Ts Tc 2.03 ms -1 (400 ft./min) 4.0 1.02 ms -1 (200 ft./min) -1 3.0 0.51 ms (100 ft./min) 0.31 ms -1 (60 ft./min) 2.0 NATURAL CONVECTION 1.0 70 80 90 100 LOCAL AMBIENT TEMPERATURE, TA (C) 8-988(C) Figure 19. Total Power Dissipation vs. Local Ambient Temperature and Air Velocity TA SA where PD is the power dissipated by the module, CS represents the interfacial contact resistance between the module and the sink, and SA is the sink-to-ambient thermal impedance (C/W). For thermal greases or foils, a value of CS = 0.1 C/W to 0.3 C/W is typical. The required SA is calculated from the following equation: SA TC - TA = ----------------- - C S P D total Note that this equation assumes that all dissipated power must be shed by the sink. Depending on the user-defined application environment, a more accurate model including heat transfer from the sides and rear of the module can be used. This equation provides a conservative estimate in such instances. Lineage Power For further information, refer to the Thermal Energy Management CC-, CW-, DC-Series 25 W to 30 W Board-Mounted Power Modules Technical Note. 13 CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Outline Diagrams Dimensions are in millimeters and (inches). Copper paths must not be routed beneath the power module standoffs. Tolerances: x.x 0.5 mm (0.02 in.), x.xx 0.25 mm (0.010 in.). Note: For standard modules, VI(+) is internally connected to case. Top View 71.1 (2.80) MAX PIN 1 INDICATOR Lucent 61.0 (2.40) MAX M3 DC-DC POWER MODULE MADE IN USA Side View 0.51 (0.020) 12.7 (0.50) MAX 1.02 (0.040) 0.08 (0.003) DIA SOLDER-PLATED BRASS, 6 PLACES (7 PLACES WITH OPTIONAL CASE GROUND) 5.8 (0.23) Bottom View STAND-OFF, 4 PLACES 4.8 (0.19) 5.1 (0.20) 7.1 (0.28) CASE PIN OPTIONAL 4 61.0 25.40 (2.40) (1.000) MAX 10.16 (0.400) 3 VI(-) 50.8 (2.00) 2 VI(+) VO2(-) 5 15.24 (0.600) 24.1 (0.95) 1 ON/OFF MOUNTING INSERTS M3 x 0.5 THROUGH 4 PLACES 5.08 (0.200) 20.32 (0.800) COM 6 VO1(+) 7 12.70 (0.500) 48.3 (1.90) 11.4 (0.45) 63.50 0.38 (2.500 0.015) 3.8 (0.15) 71.1 (2.80) MAX 8-755(C).b 14 Lineage Power CW025 Dual Output-Series Power Modules: 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Recommended Hole Pattern Component-side footprint. Dimensions are in millimeters and (inches). Recommended hole size for pin: 1.27 mm (0.050 in.). CASE OUTLINE M3 x 0.5 CLEARANCE HOLE 4 PLACES (OPTIONAL) 7 24.1 (0.95) 1 12.70 (0.500) 20.32 0.800 6 15.24 (0.600) 5 61.0 (2.40) MAX 2 5.08 (0.200) 50.8 (2.00) 25.40 (1.000) 3 10.16 (0.400) 4 5.1 (0.20) 48.3 (1.90) CASE PIN OPTIONAL 11.4 (0.45) 63.50 0.38 (2.500 0.015) 3.8 (0.15) 71.1 (2.80) MAX 8-755(C).b Lineage Power 15 CW025 Dual Output-Series Power Modules:Apri 36 Vdc to 75 Vdc Input; 25 W Data Sheet April 2008 Ordering Information Table 4. Ordering Information Table Input Voltage Output Voltage Output Power Remote On/Off Logic Device Code Comcode 36 V--75 V 5 V 25 W positive CW025AJ-M 107587230 36 V--75 V 12 V 25 W positive CW025BK-M 107587248 36 V--75 V 15 V 25 W positive CW025CL-M 107587255 36 V--75 V 12 V 25 W negative CW025BK1-M 107637761 Optional features may be ordered using the device code suffixes shown below. To order more than one option, list suffixes in numerically descending order followed by the -M suffix, indicating metric (M3 x 0.5 heat sink hardware). The heat sinks designed for this package have an M prefix, i.e., MHSTxxx45 and MHSLxxx45 (see Thermal Energy Management CC-, CW-, DC-, and DW-Series 25 W to 30 W Board-Mounted Power Modules Technical Note). Table 5. Options Table Option Device Code Suffix Short pin: 2.79 mm 0.25 mm (0.110 in. 0.010 in.) 8 Isolated case ground pin 7 Negative logic remote on/off 1 Please contact your Lineage Power Account Manager or Field Application Engineer for pricing and availability. A sia-Pacific Head qu art ers T el: +65 6 41 6 4283 World W ide Headq u arters Lin eag e Po wer Co rp oratio n 30 00 Sk yline D riv e, Mes quite, T X 75149, U SA +1-800-526-7819 (Outs id e U .S.A .: +1- 97 2-2 84 -2626) www.line ag ep ower.co m e-m ail: tech sup port1@ lin ea gep ower.co m Eu ro pe, M id dle-East an d Afric a He ad qu arters T el: +49 8 9 6089 286 Ind ia Head qu arters T el: +91 8 0 28411633 Lineage Power reserves the right to make changes to the produc t(s) or information contained herein without notice. No liability is ass umed as a res ult of their use or applic ation. No rights under any patent acc ompany the sale of any s uc h pr oduct(s ) or information. (c) 2008 Lineage Power Corpor ation, (Mesquite, Texas ) All International Rights Res er ved. April 2008 DS96-051EPS (Replace DS96-050EPS)