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datasheet ds_d48s1238_05142009 features ? high efficiency: 94.5% at 12v/38a ? industry standard quarter brick footprint ? size: 57.9mm x 36.8mm x 12.7mm (2.28in x 1.45in x 0.50in) ? 2250v isolation ? low output ripple and noise ? output over current/voltage protection ? latch after ocp & output ovp shutdown ? over-temperature protection ? parallel operation (droop current sharing) ? power good (pok) (option) ? rohs 6/6 (lead free) ? iso 9001, tl 9000, iso 14001, qs9000, ohsas18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada) recognized, and tuv (en60950-1) certified ? ce mark meets 73/23/eec and 93/68/eec directives applications ? data communication ? distributed power architecture ? servers and workstations ? lan / wan applications ? data processing applications options ? positive on/off logic ? heatspreader ? case ground pin ? power good pin delphi series d48s1238, 450w quarter brick dc/dc power modules: 48v in, 12v/38a out the delphi series d48s1238, quarter brick, 43~57v input, single output, isolated dc/dc converter is the latest offering from a world leader in power system and technology and manufacturing D delta electronics, inc. this product fa mily provides up to 450 watts of regulated 12v output power in an industry standard quarter brick footprint and pinout. with creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performances, as well as extremely high reliability under highly stressful operating conditions. all models are fully protected from abnormal input/output voltage, current, and temperature conditions. the delphi series converters meet all safety requirements with basic insulation.
ds_d48s1238-2_04142009 2 technical specifications (t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted; parameter notes and conditions d48s1238 (standard) min. typ. max. units absolute maximum ratings input voltage 43 48 57 vdc operating case temperature (open frame) please refer to figure13 -40 110 c operating case temperature (with heatspreader) please refer to figure14 -40 90 c storage temperature -40 125 c input/output isolation voltage 1 minute 2250 vdc input characteristics operating input voltage 43 48 57 vdc input under-voltage lockout turn-on voltage threshold 42 vdc turn-off voltage threshold 40 vdc lockout hysteresis voltage 2 vdc maximum input current 100% load, 43vin 12.5 a no-load input current tbd tbd ma off converter input current tbd tbd ma inrush current(i 2 t) tbd a 2 s input reflected-ripple current p-p thru 12h inductor, 5hz to 20mhz tbd ma input voltage ripple rejection 120 hz tbd db output characteristics initial set point accuracy vin=51.4v, io=20a 12.19 12.21 vdc output voltage regulation over load io=io,min to io,max 11.4 12.6 vdc over line vin=43v to 57v 11.4 12.6 vdc total output voltage range over load, line and temperature 11.4 12.6 adc output voltage ripple and noise cout 2200f x2 (max esr 20 m ? ) with 10f tantalum & 0.47f ceramic cap. 5hz to 20mhz bandwidth 35 70 mvp-p operating output current range 3.75 38 a output dc current-limit inception output voltage 10% low 105 130 % dynamic characteristics output voltage current transient 48v, 2200fx2pcs load cap, 0.1a/s positive step change in output current 50% io.max to 75% io.max 11.4 12.6 vdc negative step change in output current 75% io.max to 50% io.max 11.4 12.6 vdc settling time (within 1% vout nominal) tbd us turn-on transient start-up time, from on/off control from on/off falling edge to 10%vo,set 0 10 ms start-up time, from input from 90% of vin to vo = 10%vo,set 10 40 ms rise time 10% of vo to 90% of vo 1 30 ms capacitive loading for d48s1238-2 a/e 1000 25000 f for D48S1238-2C 4400 25000 f overshoot at turn-on/turn-off vin=48v, io=min-max tbd tbd vdc protection short circuit protection withstand continuous short-circuit, latch mode over current protection (ocp) vin=48v, vo=12v shall exist for at least 250ms ~ 1sec 105 130 % of io over voltage protection (ovp) vin=48v 12.9 14.2 vdc efficiency 100% load vin=48v, vo=12v, io=38a 94.5 % isolation characteristics input to output 2250 vdc isolation resistance 10 m ? isolation capacitance 1000 pf feature characteristics switching frequency 350 khz on/off control, negative remote on/off logic logic low (module on) von/off at io n/off=1.0ma 0 0.8 v logic high (module off) von/off at ion/off=0.0 a 15 v on/off current (for both remote on/off logic) ion/off at von/off=0.0v 1 ma leakage current (for both remote on/off logic) logic high, von/off=15v 50 ua power good assertion time from 90% of vo to power good fell to ground 1 10 ms power good out of regulation from 90% of vo (falling) to power good rise 0 2 ms general specifications mtbf io=80% of io, max; tc=40c 1 m hours io=80% of io, max; tc=25c 1.3 weight with heatspreader 61 grams
ds_d48s1238-2_04142009 3 electrical characteristics curves 88 89 90 91 92 93 94 95 96 0 10203040 output current (a) efficiency (%) 48v 57v 43v 0 5 10 15 20 25 30 35 010203040 output current (a) power dissipation (w) 48v 57v 43v figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25c. figure 3: output voltage regulation vs. load current showing typical current limit curves and converter shutdown point for minimum, nominal, and maximum input voltage at room temperature. 10 11 11 12 12 13 13 14 14 010203040 output current (a) vout (v) 48v 57v 43v
ds_d48s1238-2_04142009 4 electrical characteristics curves for negative remote on/off logic figure 4: turn-on transient at full load current) (2ms/div). ch3 : vout; 2v/div; ch2 : on/off input: 2v/div. figure 5: turn-on transient at zero load current (2 ms/div). ch3 : vout; 2v/div; ch2: on/off input: 2v/div figure 6: output voltage response to step-change in load current (50%-75%-50% of io, max; di/dt = 0.1a/s). load cap: 10f, tantalum capacitor and 0.47f ceramic capacitor. trace: vout (500mv/div). scope measurement should be made using a bnc cable (length shorter than 20 inches). position the load between 51mm to 76mm (2 inches to 3 inches) from the module. ch 2 ch 3 ch 2 ch 3
ds_d48s1238-2_04142009 5 electrical characteristics curves figure 7: test set-up diagram showing measurement points for input terminal ripple current and input reflected ripple current. note: measured input reflected-ripple current with a simulated source inductance (l test ) of 12 h. capacitor cs offset possible battery impedance. measure current as shown above. figure 8: input terminal ripple current, i c , at full rated output current and nominal input voltage with 12h source impedance and 33f electrolytic capacitor (50 ma/div). figure 9: output voltage noise and ripple measurement test setup. figure 10: output voltage ripple at nominal input voltage and rated load current (20mv/div). load capacitance: 2200uf*2 electrical capacitor, 0.47f ceramic capacitor and 10f tantalum capacitor. bandwidth: 20 mhz. scope measurement should be made using a bnc cable (length shorter than 20 inches). position the load between 51 mm to 76 mm (2 inches to 3 inches) from the module.
ds_d48s1238-2_04142009 6 design considerations input source impedance the impedance of the input source connecting to the dc/dc power modules will interact with the modules and affect the stability. a low ac-impedance input source is recommended. if the source inductance is more than a few h, we advise adding a 10 f to 100 f electrolytic capacitor (esr < 0.7 ? at 100 khz) mounted close to the input of the module to improve the stability. layout and emc considerations delta?s dc/dc power modules are designed to operate in a wide variety of systems and applications. for design assistance with emc compliance and related pwb layout issues, please contact delta?s technical support team. an external input filter module is available for easier emc compliance design. application notes to assist designers in addressing these issues are pending release. safety considerations the power module must be installed in compliance with the spacing and separation requirements of the end-user?s safety agency standard, i.e., ul60950-1, can/csa-c22.2, no. 60950-1 and en60950-1+a11 and iec60950-1, if the system in which the power module is to be used must meet safety agency requirements. basic insulation based on 75 vdc input is provided between the input and output of the module for the purpose of applying insulation requirements when the input to this dc-to-dc converter is identified as tnv-2 or selv. an additional evaluation is needed if the source is other than tnv-2 or selv. when the input source is selv circuit, the power module meets selv (safety extra-low voltage) requirements. if the input source is a hazardous voltage which is greater than 60 vdc and less than or equal to 75 vdc, for the module?s output to meet selv requirements, all of the following must be met: ? the input source must be insulated from the ac mains by reinforced or double insulation. ? the input terminals of the module are not operator accessible. ? if the metal baseplate / heatspreader is grounded the output must be also grounded. ? a selv reliability test is conducted on the system where the module is used , in combination with the module, to ensure that under a single fault, hazardous voltage does not appear at the module?s output. when installed into a class ii equipment (without grounding), spacing consideration should be given to the end-use installation, as the spacing between the module and mounting surface have not been evaluated. the power module has extra-low voltage (elv) outputs when all inputs are elv. this power module is not internally fused. to achieve optimum safety and system protection, an input line fuse is highly recommended. the safety agencies require a normal-blow fuse with 20a maximum rating to be installed in the ungrounded lead. a lower rated fuse can be used based on the maximum inrush transient energy and maximum input current. soldering and cleaning considerations post solder cleaning is usually the final board assembly process before the board or system undergoes electrical testing. inadequate cleaning and/or drying may lower the reliability of a power module and severely affect the finished circuit board assembly test. adequate cleaning and/or drying is especially important for un-encapsulated and/or open frame type power modules. for assistance on appropriate soldering and cleaning procedures, please contact delta?s technical support team.
ds_d48s1238-2_04142009 7 features descriptions over-current protection the modules include an internal output over-current protection circuit, which will endure current limiting for an unlimited duration during output overload. if the output current exceeds the ocp set point, the modules will automatically shut down (hiccup mode). the modules will try to restart after shutdown. if the overload condition still exists , the module will shut down again. this restart trial will continue until the overload condition is corrected. over-voltage protection the modules include an internal output over-voltage protection circuit, which monitors the voltage on the output terminals. if this voltage exceeds the over-voltage set point, the module will shut down and latch off. the over-voltage latch is reset by either cycling the input power or by toggling the on/off signal for one second. over-temperature protection the over-temperature protecti on consists of circuitry that provides protection from thermal damage. if the temperature exceeds the ov er-temperature threshold the module will shut down. the module will try to rest art after shutdown. if the over-temperature co ndition still exists during restart, the module will shut down again. this restart trial will continue until the temperature is within specification. remote on/off the remote on/off feature on the module can be either negative or positive logic. negative logic turns the module on during a logic low and off during a logic high. positive logic turns the modules on during a logic high and off during a logic low. remote on/off can be controlled by an external switch between the on/off terminal and the vi (-) terminal. the switch can be an open collector or open drain. for negative logic if the remote on/off feature is not used, please short the on/off pin to vi (-). for positive logic if the remote on/off feature is not used, please leave the on/off pin to floating. figure 11: remote on/off implementation power good the converter (c, d option code) provides an open collector signal called power good (pok). this output pin uses negative logic. it is set high when the output is not within regulati on of output voltage or enable is off. the power good signal is pulled low when output is within regulation of output voltage.
ds_d48s1238-2_04142009 8 thermal considerations thermal management is an important part of the system design. to ensure proper, reliable operation, sufficient cooling of the power module is needed over the entire temperature range of the modul e. convection cooling is usually the dominant mode of heat transfer. hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel. thermal testing setup delta?s dc/dc power modules are characterized in heated vertical wind tunnels t hat simulate the thermal environments encountered in most electronics equipment. this type of equipment commonly uses vertically mounted circuit card s in cabinet racks in which the power modules are mounted. the following figure shows the wind tunnel characterization setup. the power module is mounted on a test pwb and is vertically positioned within the wind tunnel. the space between the neighboring pwb and the top of the power modul e is constantly kept at 6.35mm (0.25??). note: wind tunnel test setup figure dimensions are in millimeters and (inches) 12.7 (0.5?) module a ir flo w 50.8 ( 2.0? ) facing pwb pwb air velocit y and ambient temperature measured below the module figure 12: wind tunnel test setup thermal derating heat can be removed by increasing airflow over the module. to enhance system reliability, the power module should always be operated below the maximum operating temperature. if the temperature exceeds the maximum module temperature, reliability of the unit may be affected. thermal curves figure 13: temperature measurement location (open frame) * the allowed maximum hot spot temperature is defined at 110 . input output figure 14: temperature measurement location (with heatspreader) * the allowed maximum hot spot temperature is defined at 90 . d48s1238-2 output current vs. ambient temperature and air velocity @ vin =48v, open frame(transverse orientation) 0 5 10 15 20 25 30 35 40 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 500lfm 200lfm 600lfm 100lfm 300lfm 400lfm figure 15: output current vs. ambient te mperature and air velocity@ v in =48v (open frame, transverse orientation)
ds_d48s1238-2_04142009 9 d48s1238-2 output current vs. ambient temperature and air velocity @ vin =48v, open frame(longitudinal orientation) 0 5 10 15 20 25 30 35 40 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 500lfm 200lfm 600lfm 100lfm 300lfm 400lfm figure 16: output current vs. ambient temperature and air velocity @ v in =48v (open frame, longitudinal orientation) d48s1238-2 output current vs. ambient temperature and air velocity @ vin =48v, with heatspreader(transverse orientation) 0 5 10 15 20 25 30 35 40 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 600lfm 100lfm 300lfm 500lfm 400lfm figure 17: output current vs. ambient temperature and air velocity @ v in =48v (with heatspreader, transverse orientation) d48s1238-2 output current vs. ambient temperature and air velocity @ vin =48v, with heatspreader(longitudinal orientation) 0 5 10 15 20 25 30 35 40 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 600lfm 100lfm 300lfm 500lfm 400lfm figure 18: output current vs. ambient temperature and air velocity @ v in =48v(with heatspreader, longitudinal orientation )
ds_d48s1238-2_04142009 10 mechanical drawing (w ithout heatspreader)
ds_d48s1238-2_04142009 11 mechanical drawing (with heatspreader) * for modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly onto system boards; please do not subject such modules through reflow temperature profile. pin no. name function 1 2 3 4 5 6 7 +vin on/off case -vin -vout pok +vout positive input voltage remote on/off case (optional) negative input voltage negative output voltage power good (optional) positive output voltage notes: 1. pin1, 2, 3, 4 and 6 ar e1.00mm (0.040?) diameter. 2. all pins are copper with tin plating (lead free)
ds_d48s1238-2_04142009 12 mechanical drawing (with he atsink, option code d) * for modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly onto system boards; please do not subject such modules through reflow temperature profile.
ds_d48s1238-2_04142009 13 part numbering system d 48 s 12 38 ?2 a/c/d/e type of product input voltage number of outputs output voltage output current option code d - dc/dc modules 48 - 43 ~57v s - single 12 - 12v 38 - 38a 2 a - standard, with heatspreader and case pin, pin length 0.180" 2 c - with heatspreader, no case pin, with powergood pin, pin length 0.180" 2 d - with heat sink, no case pin, with powergood pin, pin length 0.180" 2 e - same as 2 a, but with 0.250" pin length model list part number input output pin length(l) case pin pok pin eff @ 100% load d48s1238-2 a 43v~57v 12.5a 12v 38a 4.60(0.180?) yes no 94.5% d48s1238-2 c 43v~57v 12.5a 12v 38a 4.60(0.180?) no yes 94.5% d48s1238-2 d 43v~57v 12.5a 12v 38a 4.60(0.180?) no yes 94.5% d48s1238-2 e 43v~57v 12.5a 12v 38a 6.35(0.250?) yes no 94.5% default remote on/off logic is negative for different remote on/off logic or heatspreader assembly, please contact your local sales * for modules with through-hole pins and the optional heatspreader, they are intended for wave soldering assembly onto system boards; please do not subject such modules through reflow temperature profile. contact : www.delta.com.tw/dcdc usa: telephone: east coast: (888) 335 8201 west coast: (888) 335 8208 fax: (978) 656 3964 email: dcdc@delta-corp.com europe: phone: +41 31 998 53 11 fax: +41 31 998 53 53 email: dcdc@delta-es.com asia & the rest of world: telephone: +886 3 4526107 ext 6220~6224 fax: +886 3 4513485 email: dcdc@delta.com.tw warranty delta offers a two (2) year limited warrant y. complete warranty information is list ed on our web site or is available upon request from delta. information furnished by delta is believed to be accurate and re liable. however, no responsibility is assumed by delta for its use, nor for any infringements of patents or other rights of thir d parties, which may result from its use. no license is grante d by implication or otherwise under any patent or patent rights of delta. delta reserves the right to revise these specifications at any time, without notice .

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