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data sheet april 2008 dw025 dual output-series powe r modules: dc-dc converters; 36 vdc to 75 vdc input; dual outputs; 25 w the dw025-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 with separate case ground pin n 2:1 input voltage range n remote on/off (positive logic) n ul* recognized, csa ? certified, and vde licensed n within fcc and cispr class a radiated limits n ce mark meets 73/23/eec and 93/68/eec directives ? n two tightly regulated outputs applications n distributed power architectures n telecommunications options n higher-accuracy output vo ltage clamp set point n short pins: 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 dw025-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 con - trol circuit and has an independent overvoltage clamp. with standard outputs of +3.3 v, 5 v, 12 v, and 15 v, the dw025-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 tem - perature range, and a metal case are additional fea - tures of these modules. they have ul , csa , and vde recognition and operat e within fcc and cispr class a limits for radiated emissions. the dw025aj-m, bk-m, and cl-m power modules are available with common output ground pins (pinout a); the dw025aa-m, ab-m, af-m, bb-m, and cc-m power modules are available with sepa - rate output ground pins (pinout b). * ul is a registered trademark of underwriters laboratories, inc. ? csa is a registered trademark of the canadian standards asso - ciation. ? this product is intended for integration into end-use equipment. all the required procedures for ce marking of end-use equip - ment should be followed. (the ce mark is placed on selected products.)
2 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series powe r modules: dc-dc converters; absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are abso - lute stress ratings only. functional operation of the device 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 af fect device reliability. parameter symbol min max unit input voltage continuous transient (<10 ms) v i v i, trans ? ? 80 100 v v i/o isolation voltage dc transient (1 minute) ? ? ? ? 500 850 v v operating case temperature t c ?40 100 c storage temperature t stg ?55 125 c electrical specifications note: two pinouts are available for the dw025-series power modules. the dw025aj-m, ab-m, bk-m, and cl-m power modules, which have both positive and ne gative outputs, have a common output ground pin (pinout a). the dw025aa-m, ab-m, af-m, bb-m, and cc -m power modules, which have dual positive out - puts, have separate output ground pins (pinout b). see outline diagrams section. unless otherwise indicated, sp ecifications apply to all modules over all operating input voltage, resistive load, and temperature conditions. table 1. input specifications parameter symbol min typ max unit operating input voltage v i 36 48 75 vdc maximum input current (v i = 0 v to 75 v; i o = i o , max ; see figure 1 .) i i, max ? ? 2.0 a inrush transient i 2 t ? ? 0.8 a 2 s input reflected-ripple current, peak-to-peak (5 hz to 20 mhz, 12 h source impedance; t c = 25 c) (see figure 11 and design considerations section.) ? ? 25 ? map-p input ripple rejection (120 hz) ? ? 60 ? db fusing considerations caution: this power module is not internally fu sed. an input line fuse must always be used. this encapsulated power module can be used in a wide va riety of applications, ranging from simple stand-alone operation to an integrated pa rt of a sophisticated power ar chitecture. to preserve maxi mum flexibility, internal fus - ing 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 maxi mum 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 fu se manufacturer?s data for further information.
lineage power 3 data sheet april 2008 36 vdc to 75 vdc inpu t; dual outputs; 25 w dw025 dual output-series powe r modules: dc-d c converters; electrical specifications (continued) table 2. output specifications parameter device symbol min typ max unit output voltage (over all operating input voltage, resistive load, and temperature conditions until end of life. see figure 13 .) dw025aj-m dw025bk-m DW025CL-M dw025aa-m dw025ab-m dw025af-m dw025bb-m dw025cc-m v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 4.80 ? 4.80 11.40 ? 11.40 14.25 ?14.25 4.80 4.80 4.80 11.40 4.80 3.16 11.40 11.40 14.25 14.25 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 5.25 ?5.25 12.60 ?12.60 15.75 ?15.75 5.25 5.25 5.25 12.60 5.25 3.45 12.60 12.60 15.75 15.75 vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc output voltage set point (v i = 48 v; i o = i o, max ; t a = 25 c) dw025aj-m dw025bk-m DW025CL-M dw025aa-m dw025ab-m dw025af-m dw025bb-m dw025cc-m v o1, set v o2, set v o1, set v o2, set v o1, set v o2, set v o1, set v o2, set v o1, set v o2, set v o1, set v o2, set v o1, set v o2, set v o1, set v o2, set 4.90 ? 4.90 11.76 ?11.76 14.70 ?14.70 4.90 4.90 4.90 11.76 4.90 3.23 11.76 11.76 14.70 14.70 5.0 ?5.0 12.0 ?12.0 15.0 ?15.0 5.0 5.0 5.0 12.0 5.0 3.3 12.0 12.0 15.0 15.0 5.10 ?5.10 12.24 ?12.24 15.30 ?15.30 5.10 5.10 5.10 12.24 5.10 3.37 12.24 12.24 15.30 15.30 vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc vdc output regulation: line (v i = 36 v to 75 v) load (i o1 = i o, min to i o, max, i o2 = i o, max ) all all ? ? ? ? 0.1 0.1 0.2 0.4 % % load (i o2 = i o, min to i o, max, i o1 = i o, max ) dw025aj-m, aa-m, bk-m, bb-m, cl-m, cc-m, ab-m ? ? 0.1 0.4 % dw025af-m ? ? 0.4 0.8 % temperature (t c = ? 40 c to +100 c) dw025aj-m, aa-m, af-m ? ? 15 70 mv dw025bk-m, bb-m ? ? 40 150 mv DW025CL-M, cc-m ? ? 40 190 mv dw025ab-m (5 v output) ? ? 15 70 mv dw025ab-m (12 v output) ? ? 40 150 mv
4 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series powe r modules: dc-dc converters; electrical specifications (continued) table 2. output specifications (continued) parameter device symbol min typ max unit output ripple and noise (see figure 12.): rms dw025aj-m, aa-m, af-m ? ? ? 15 mvrms dw025bk-m, bb-m ? ? ? 20 mvrms DW025CL-M, cc-m ? ? ? 25 mvrms dw025ab-m (5 v output) ? ? ? 15 mvrms dw025ab-m (12 v output) ? ? ? 20 mvrms peak-to-peak (5 hz to 20 mhz) dw025aj-m, aa-m, af-m ? ? ? 150 mvp-p dw025bk-m, bb-m ? ? ? 200 mvp-p DW025CL-M, cc-m ? ? ? 250 mvp-p dw025ab-m (5 v output) ? ? ? 150 mvp-p dw025ab-m (12 v output) ? ? ? 200 mvp-p output current (at i o < i o, min , the modules may exceed output ripple specifications.) dw025aj-m, aa-m, af-m i o1 i o2 0.20 0.20 ? ? 2.50 2.50 a a dw025bk-m, bb-m i o1 i o2 0.10 0.10 ? ? 1.04 1.04 a a DW025CL-M, cc-m i o1 i o2 0.08 0.08 ? ? 0.83 0.83 a a dw025ab-m i o1 i o2 0.20 0.10 ? ? 2.50 1.04 a a output current- limit inception (v o = 90% of v o, nom ; see figure 2 .) dw025aj-m, aa-m, af-m ? ? 3.7 6.5 a dw025bk-m, bb-m ? ? 1.5 2.9 a DW025CL-M, cc-m ? ? 1.3 2.7 a dw025ab-m i o1 i o2 ? ? 3.7 1.5 6.5 2.9 a a output short-circuit current (v o = 250 mv) dw025aj-m, aa-m, af-m ? ? 3.5 7.0 a dw025bk-m, bb-m ? ? 1.0 3.0 a DW025CL-M, cc-m ? ? 1.0 3.0 a dw025ab-m i o1 i o2 ? ? 3.5 1.0 7.0 3.0 a a efficiency (v i = 48 v; i o = i o, max ; t c = 25 c; see figures 3 and 13 .) dw025aj-m, aa-m 75 78 ? % dw025af-m 68 75 ? % dw025ab-m 75 79 ? % dw025bk-m, bb-m 79 82 ? % DW025CL-M, cc-m 79 82 ? %
lineage power 5 data sheet april 2008 36 vdc to 75 vdc inpu t; dual outputs; 25 w dw025 dual output-series powe r modules: dc-d c converters; electrical specifications (continued) table 2. output specifications (continued) parameter device symbol min typ max unit dynamic response (yi o /yt = 1 a/10 s, v i = 48 v, t a = 25 c): load change from i o = 50% to 75% of i o, max : (see figures 7 to 9 .): peak deviation dw025aj-m, aa-m, af-m ? ? 160 ? mv dw025bk-m, bb-m ? ? 250 ? mv DW025CL-M, cc-m ? ? 250 ? mv dw025ab-m (5 v output) ? ? 160 ? mv dw025ab-m (12 v output) ? ? 250 ? mv settling time (v o < 10% peak deviation) all ? ? 3 ? ms load change from i o = 50% to 25% of i o, max (see figures 4 to 6 .): peak deviation dw025aj-m, aa-m, af-m ? ? 160 ? mv dw025bk-m, bb-m ? ? 250 ? mv DW025CL-M, cc-m ? ? 250 ? mv dw025ab-m (5 v output) ? ? 160 ? mv dw025ab-m (12 v output) ? ? 250 ? mv settling time (v o < 10% peak deviation) all ? ? 3 ? ms table 3. isolation specifications parameter min typ max unit isolation capacitance ? 1200 ? pf isolation resistance 10 ? ? m? general specifications parameter min typ max unit calculated mtbf (i o = 80% of i o, max ; t c = 40 c) 2,800,000 hours weight ? ? 113 (4.0) g (oz.)
6 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series powe r modules: dc-dc converters; feature specifications unless otherwise indicated, specifications apply over all operating in put voltage, resistive load, and temperature conditions. see feature descriptions and desi gn considerations for further information. parameter device symbol min typ max unit remote on/off (positive logic) (v i = 0 v to 75 v; open collector or equivalent compatible; signal referenced to v i (?) terminal. see figures 10 , 14 and feature descriptions.): dw025xx-m positive logic: logic low?module off logic high?module on dw025xx1-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 (i on/off = 0) open collector swit ch specifications: leakage current during logic high (v on/off = 10 v) output low voltage during logic low (i on/off = 1 ma) turn-on time (i o = 80% of i o, max ; v o within 1% of steady state) output voltage overshoot all all all all all all all i on/off v on/off v on/off i on/off v on/off ? ? ? 0 ? ? ? ? ? ? ? ? ? ? 30 0 1.0 1.2 10 50 1.2 ? 5 ma v v a v ms % output overvoltage clamp dw025aj-m dw025bk-m DW025CL-M dw025aa-m dw025ab-m dw025af-m dw025bb-m dw025cc-m v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 v o1 v o2 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 7 ?7 16 ?16 20 ?20 7 7 7 16 7 5 16 16 20 20 v v v v v v v v v v v v v v v v input undervoltage lockout: module on module off all all v uvlo v uvlo ? 20 28 28 36 ? v v
lineage power 7 data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; characteristic curves 8-993(c).a figure 1. dw025-series input current and normal- ized output voltage vs. input voltage at full load and t a = 25 ? 8-994(c) figure 2. dw025-series normalized output current vs. normalized output voltage at v i = 48 v and t a = 25 ? 8-995(c) figure 3. dw025-series ef?iency vs. normalized both output currents to full load at v i = 48 v and t a = 25 ? 8-1019(c) figure 4. dw025-series typical 5 v output voltage response to a step load change from 50% to 25% of i o, max at v i = v i, nom and t a = 25 ? characteristic curves (continued) 0 1020304050 70 0 0.2 0.4 0.6 0.8 1.0 1.2 input voltage, v i (v) input current, i i (a) 0.8 0.6 0.4 0.2 0.0 1.0 1.2 v o 60 i i normalized output voltage 0.0 0.5 1.0 1.5 2.0 2.5 0.0 0.2 0.4 0.6 0.8 1.2 normalized output current to full load, i o (a) 1.0 v o = 3.3 v 5 v 12 v 15 v normalized output voltage, v o (v) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.0 45 50 55 60 65 85 normalized both output currents to full load, i o (a) efficiency, h (%) 0.9 70 75 80 cc,cl bb,bk aa,aj af 0.5 a 0.5 ms 50 mv 1.0 a 0.5 a time, t (0.5 ms/div) 5.0 v di o dt = 1 a/10 ? output current, i o (a) (0.5 a/div) output voltage, v o (mv) (50 mv/div)
8 8 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; 8-1017(c) figure 5. typical dw025-series 12 v output voltage response to a step load change from 50% to 25% of i o, max at v i = v i, nom and t a = 25 ? 8-1017(c).a figure 6. typical dw025-series 15 v output voltage response to a step load change from 50% to 25% of i o, max at v i = v i, nom and t a = 25 ? 8-1018(c) figure 7. typical dw025-series 5 v output voltage response to a step load change from 50% to 75% of i o, max at v i = v i, nom and t a = 25 ? 8-1017(c).b figure 8. typical dw025-series 12 v output voltage response to a step load change from 50% to 75% of i o, max at v i = v i, nom and t a = 25 ? time, t (0.5 ms/div) d i o d t = 1 a/10 ? 0.416 a 0.208 a 12.0 v 0.2 a 0.5 ms 100 mv output voltage, v o (v) (0.1 v/div) output current, i o (a) (0.2 a/div) time, t (0.5 ms/div) d i o d t = 1 a/10 ? 0.333 a 0.166 a 15.0 v 0.2 a 0.5 ms 100 mv output voltage, v o (v) (0.1 v/div) output current, i o (a) (0.2 a/div) d i o d t = 1 a/10 ? 0.5 ms 50 mv 0.5 a 1.5 a 1.0 a time, t (0.5 ms/div) 5.0 v output current, i o (a) (0.5 a/div) output voltage, v o (mv) (50 mv/div) d i o d t = 1 a/10 ? 0.5 ms 100 mv 0.2 a 0.624 a 0.416 a 12.0 v output current, i o (a) (0.2 a/div) output voltage, v o (v) (0.1 v/div) time, t (0.5 ms/div)
lineage power 9 data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; characteristic curves (continued) 8-1018(c).a figure 9. typical dw025-series 15 v output voltage response to a step load change from 50% to 75% of i o, max at v i = v i, nom and t a = 25 ? 8-1020(c) figure 10. typical dw025-series output voltage rise time with remote on/off at v i = v i, nom , i o = 0.8 (i o, max ) and t a = 25 ? test con?urations 8-489(c).a note: measure input re?cted-ripple current with a simulated source impedance (l test ) of 12 ?. capacitor c s offsets possible battery impedance. current is measured at the input of the module. figure 11. input re?cted-ripple test setup di o dt = 1 a/10 ? 0.5 ms 100 mv 0.2 a 0.500 a 0.333 a time, t (0.5 ms/div) 15.0 v output voltage, v o (v) (0.1 v/div) output current, i o (a) (0.2 a/div) di o dt = 1 a/10 ? 2 v 0 v time, t (1 ms/div) 0 v 1 ms v o , set normalized output voltage, v o remote on/off, v on/off (v) (2 v/div) to oscilloscope c s 220 ? impedance < 0.1 w @ 20 c, 100 khz v i (+) v i (? l test battery 12 ?
10 10 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; test con?urations (continued) 8-808(c) a. pinout a (dw025aj-m, bk-m, cl-m) con?ura- tion 8-809(c) b. pinout b (dw025aa-m, ab-m, af-m, bb-m, cc-m) con?uration note: use a 0.1 ? ceramic capacitor. scope measurement should be made by using a bnc socket. position the load between 50 mm (2 in.) and 75 mm (3 in.) from the module. figure 12. output noise measurement test setup 8-753(c) 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. in addition, v i (? is internally connected to case. figure 13. output voltage and ef?iency measure- ment test setup design considerations input source impedance the power module should be connected to a low ac- impedance input source. highly inductive source impedances can affect the stability of the power mod- ule. a 33 ? electrolytic capacitor (esr < 0.7 w at 100 khz) mounted close to the power module helps ensure stability of the unit. v o1 (+) v o2 (? scope 0.1 ? copper strip 0.1 ? scope comm r load1 r load2 v o1 (+) v o2 (? scope 0.1 ? copper strip 0.1 ? scope r load1 r load2 v o1 (? v o2 (+) v i (+) i i i o supply contact resistance contact and distribution losses load v i (? v o1 v o2 com load h v oj com [] i oj j1 = 2 ? v i + () v i () [] i i -------------------------------------------------- x 100 = pinout a h v oj + () v oj () [] i oj j1 = 2 ? v i + () v i () [] i i ------------------------------------------------------------- - x 100 = pinout b
lineage power 11 data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; design considerations (continued) 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 22.2-950, en60950. for the converter output to be considered to be meet- ing the requirements of safety extra-low voltage (selv), one of the following must be true: n all inputs are selv and ?ating with the output also ?ating. n all inputs are selv and grounded with the output also grounded. n any non-selv input must be provided with rein- forced insulation from any other hazardous voltages, including the ac mains, and must have a selv reli- ability test performed on it in combination with the converters. if the input meets extra-low voltage (elv) require- ments, then the converters output is considered elv. the input to these units is to be provided with a maxi- mum 5 a normal-blow fuse in the ungrounded lead. 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. feature descriptions output overvoltage clamp 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 speci?ations table). this provides a redundant voltage control that reduces the risk of output overvoltage. current limit to provide protection in a fault (output overload) condi- tion, 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 out- put 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 speci?d 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 remote on/off, code suf? ?, 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 v i (? terminal (v on/off ). the switch can be an open collector or equivalent (see figure 14). a logic low is v on/off = 0 v to 1.2 v. the maximum i on/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 v on/off generated by the power module is 10 v. the maximum allowable leakage current of the switch at v on/off = 10 v is 50 ?. 8-754(c) figure 14. remote on/off implementation com load + i on/off v on/off on/off v i (+) v i (? v o2 load v o1
12 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; thermal considerations 8-866(c).a note: dimensions are in millimeters and (inches). drawing is not to scale. figure 15. thermal test setup 50.8 (2.00) 12.7 (0.50) 101.6 (4.00) 203.2 (8.00) airflow measure case temperature at center of unit connectors to loads, power supplies, and datalogger, 6.35 (0.25) tall 203.2 (8.00) 9.7 (0.38) 19.1 (0.75) wind tunnel wall air velocity probe ambient temperatur e thermocouple air- flow the 25 w dual output power modules are designed to operate in a variety of thermal environments. as with any electronic component, suf?ient 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 con- duction, convection, and radiation to the surrounding environment. the thermal data presented is based on measure- ments 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.
lineage power 13 data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; thermal considerations (continued) basic thermal performance the dw025-series dual output 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 indi- vidually and then summing the results. figures 16 through 21 are used to predict the safe operating con- dition 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 pro- cess. 1. find the power dissipated for output 1 by using the appropriate chart (figures 16 through 19) for a par- ticular output condition (i o1 ). 2. repeat step 1 for output 2 using figures 16 through 19. 3. find the total power dissipated by summing the power dissipated on each of the outputs: (p dout1 + p dout2 ) = p d total 4. use the total power dissipated with figure 20 to determine the maximum ambient temperature at dif- ferent air velocities. for example, the dw025af-m power module operating at full load on both outputs with 54 v input has a power dissipation of 3.6 w (from figure 17) plus 3.1 w (from figure 16) for a total of 6.7 w. using figure 20, it can be determined that the maximum ambient temperature at natural convection that the dw025af-m can operate at is approximately 56 ?. keep in mind that these are approximations of the tem- peratures and air?ws required to keep the case tem- perature below its maximum rating. the maximum case temperature at the point shown in figure 15 must be kept at 100 ? or less. air velocity the air velocity required to maintain a desired maxi- mum case temperature for a given power dissipation and ambient temperature can be calculated using figure 21 and the following equation: q ca = where q ca is the thermal resistance from case-to-ambi- ent air (?/w), t c, max is the desired maximum case temperature (?), t a is the ambient inlet temperature (?), and p d total is the total power dissipated from the module (w). for example, to maintain a maximum case temperature of 85 ? with an ambient inlet temperature of 55 ? and a power dissipation of 6.7 w, the thermal resistance is: q ca = 4.5 ?/w this corresponds to an air velocity greater than 0.46 ms ? (90 fpm) in figure 21. t c max , t a p d total ------------------------------- - 85 ? 55 ? 6.7 w ------------------------------------
14 14 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; thermal considerations (continued) air velocity (continued) 8-986(c).a figure 16. 3.3 v output power dissipation vs. output current 8-987(c).a figure 17. 5 v output power dissipation vs. output current 8-1005(c).a figure 18. 12 v output power dissipation vs. output current 8-999(c).a figure 19. 15 v output power dissipation vs. output current 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 4.0 output current, i o ( a ) 2.5 3.0 3.5 power dissipation, p d (w) v i = 54 v v i = 72 v v i = 36 v 0 0.5 1.0 1.5 2.0 2.5 0 0.5 1.0 1.5 2.0 4.0 output current, i o ( a ) 2.5 3.0 3.5 power dissipation, p d (w) v i = 54 v v i = 72 v v i = 36 v 0.0 0.2 0.0 0.5 1.0 1.5 2.0 3.0 output current, i o (a) 2.5 0.8 0.4 0.6 v i = 54 v v i = 72 v v i = 36 v 1.0 1.2 p o wer di ss ipati o n, p d ( w ) 0.0 0.1 0.2 0.3 0.7 0.9 0.0 0.5 1.0 1.5 2.0 3.0 output current, i o (a) 2.5 v i = 36 v v i = 54 v v i = 72 v 0.8 0.4 0.5 0.6 power dissipation, p d (w)
lineage power 15 data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; thermal considerations (continued) air velocity (continued) 8-988(c) figure 20. total power dissipation vs. local ambient temperature and air velocity 8-989(c) figure 21. case-to-ambient thermal resistance vs. air velocity use of heat sinks and cold plates the dw025-series case includes through-threaded 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.). the following thermal model can be used to determine the required thermal resistance of the sink to provide the necessary cooling: where p d is the power dissipated by the module, q cs represents the interfacial contact resistance between the module and the sink, and q sa is the sink-to-ambient thermal impedance (?/w). for thermal grease or foils, a value of q cs = 0.1 ?/w?.3 ?/w is typical. the required q sa is calculated from the following equa- tion: q sa = [(tc ?t a )/p d ] ? q cs note that this equation assumes that all dissipated power must be shed by the heat sink. depending on the user-de?ed application environment, a more accu- rate model including heat transfer from the sides and bottom of the module can be used. this equation pro- vides a conservative estimate in such instances. for further information, refer to the thermal energy management cc-, cw-, dc-, and dw-series 25 w to 30 w board-mounted power modules technical note. 40 50 60 90 100 0.0 4.0 5.0 6.0 10.0 local ambient temperature, t a (c) 7.0 8.0 9.0 70 80 3.0 2.0 1.0 2.03 ms ? (400 ft./min) natural convection 1.02 ms ? (200 ft./min) total power dissipation, p d (w) 0.51 ms ? (100 ft./min) 0.31 ms ? (60 ft./min) nat conv 0.25 (50) 0.51 (100) 0.76 (150) 1.78 (350) 2.03 (400) 0.0 1.0 2.0 3.0 7.0 velocity ms ? (ft./min.) 4.0 5.0 6.0 1.02 (200) 1.27 (250) 1.52 (300) thermal resistance case to ambient ( c/w) p d q cs t a tc l ts q sa
16 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; 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.). pinout a (dw025aj-m, bk-m, cl-m) 8-845(c).a top view side view bottom view dc-dc power module 71.1 (2.80) max 61.0 (2.40) max made in usa pin 1 indicator m3 on/off case v i (? v o1 (+) nc v o2 (? 5.1 (0.20) 4.8 (0.19) 11.4 (0.45) 3.8 (0.15) mounting inserts m3 x 0.5 through, 4 places stand-off, 4 places 10.16 (0.400) 48.3 (1.90) 63.50 0.38 (2.500 0.015) 10.16 (0.400) 10.16 (0.400) 50.8 (2.00) 20.32 (0.800) 20.32 (0.800) 20.32 (0.800) 30.5 (1.20) 7.1 (0.28) com v i (+) 4 5 1 2 3 8 7 6 1.02 (0.040) 0.08 (0.003) dia tin-plated brass, 8 places 12.7 (0.50) max 5.1 (0.20) min 0.51 (0.020)
lineage power 17 data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; outline diagrams (continued) 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.). pinout b (dw025aa-m, ab-m, af-m, bb-m, cc-m) 8-846(c).a top view side view bottom view dc-dc power module made in usa 71.1 (2.80) max 61.0 (2.40) max lucent pin 1 indicator m3 on/off case v i (? v o1 (+) nc v o2 (? v o2 (+) 5.1 (0.20) 4.8 (0.19) 11.4 (0.45 ) 3.8 (0.15) mounting inserts m3 x 0.5 through, 4 places stand-off, 4 places 10.16 (0.400) 48.3 (1.90) 63.50 0.38 (2.500 0.015) 10.16 (0.400) 50.8 (2.00) 20.32 (0.800) 20.32 (0.800) 20.32 (0.800) 30.5 (1.20) 7.1 (0.28) 10.16 (0.400) 10.16 (0.400) v i (+) v o1 (? 1 2 4 3 9 8 6 7 5 1.02 (0.040) 0.08 (0.003) dia tin-plated brass, 9 places 12.7 (0.50) max 5.1 (0.20) min 0.51 (0.020)
18 lineage power data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series power modules: dc-dc converters; recommended hole patterns component-side footprint. dimensions are in millimeters and (inches). recommended hole size for pin: 1.27 mm (0.050 in.). pinout a (dw025aj-m, bk-m, cl-m) 8-845(c).a pinout b (dw025aa-m, ab-m, af-m, bb-m, cc-m) 8-846(c).a 11.4 (0.45) 3.8 (0.15) 5.1 (0.20) case outline 48.3 (1.90) 63.50 0.38 (2.500 0.015) 71.1 (2.80) max 20.32 (0.800) 20.32 (0.800) 30.5 (1.20) 20.32 (0.800) 61.0 (2.40) max m3 x 0.5 clearance hole 4 places (optional) 10.16 (0.400) 1 8 10.16 (0.400) 50.8 (2.00) 10.16 (0.400 ) 4 3 2 5 6 7 case outline 11.4 (0.45) 3.8 (0.15) 5.1 (0.20 ) case outline 10.16 (0.400) 10.16 (0.400) 48.3 (1.90) 63.50 0.38 (2.500 0.015) 71.1 (2.80) max m3 x 0.5 clearance hole 4 places (optional) 10.16 (0.400) 10.16 (0.400) 50.8 (2.00) 20.32 (0.800) 20.32 (0.800) 30.5 (1.20) 20.32 (0.800) 61.0 (2.40) max 4 3 1 2 5 6 8 7 9
lineage power 19 data sheet april 2008 36 vdc to 75 vdc inpu t; dual outputs; 25 w dw025 dual output-series powe r modules: dc-d c converters; ordering information table 4 . ordering information table input voltage output voltage output power remote on/off logic device code pinout comcode 36 v to 75 v 5.0 v, ?5.0 v 25 w positive dw025aj-m a 107587545 36 v to 75 v 12.0 v, ?12.0 v 25 w positive dw025bk-m a 107587602 36 v to 75 v 15.0 v, ?15.0 v 25 w positive DW025CL-M a 107587628 36 v to 75 v 5.0 v, ?5.0 v 25 w positive dw025aa-m b 107731598 36 v to 75 v 5.0 v, 3.3 v 25 w positive dw025af-m b 107587529 36 v to 75 v 12.0 v, 12.0 v 25 w positive dw025bb-m b 107587586 36 v to 75 v 15.0 v, 15.0 v 25 w positive dw025cc-m b tbd 36 v to 75 v 5.0 v, 12.0 v 25 w positive dw025ab-m b 107587503 optional features may be ordered using the device code su ffixes 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 te c h n i c a l note). table 5 option device code suffix short pins: 2.79 mm 0.25 mm (0.110 in. 0.010 in.) 8 negative remote on/off logic 1 . options table please contact your lineage power account manager or fiel d application engineer for pricing and availability.
data sheet april 2008 36 vdc to 75 vdc input; dual outputs; 25 w dw025 dual output-series powe r modules: dc-dc converters; april 2008 ds96-0 78eps (replaces ds96-077eps) world wide headquarters lin eag e po wer co rp or atio n 30 00 skyline drive, mesquite, tx 75149, usa +1-800-526-7819 (outside 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 asia-pacific headquart ers tel: +65 6 41 6 4283 eu ro pe, m id dle-east an d afr ic a he ad qu arter s tel: +49 8 9 6089 286 india headquarters tel: +91 8 0 28411633 lineage power 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. ? 2008 lineage power corporation, (mesquite, texas) all international rights reserved.

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