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datasheet ds_dus1250ex_10292008 features ? high efficiency: 92.0% @ 12vin, 5v/10a out ? size: 17.15mm x 13.97mm x 8.07 mm (0.67? 0.55? 0.31?) ? wide input range: 2.97v~13.2v ? output voltage programmable from 0.59vdc to 5vdc via external resistors ? no minimum load required ? fixed frequency operation ? power good and sense functions ? output ocp, scp, ovp ? remote on/off (positive) ? iso 9001, tl 9000, iso 14001, qs9000, ohsas18001 certified manufacturing facility applications ? datacom ? distributed power architectures ? servers and workstations ? lan/wan applications ? data processing applications options dus1250ex series non-isolated point of load dc/dc modules: 2.97~13.2vin, 0.59v-5vout, 10aout the delphi dus1250ex series, 2.97v~13.2v wide input, 10a, wide trim single output, non-isolated point of load (pol) dc/dc converters are the latest offering from a world leader in power systems technology and manufacturing delta electronics, in c. the dus1250ex product family is the second generation, non-isolated point-of-load dc/dc power modules which cut the module size by almost 50% in most of the cases compared to the first generation nc series pol modules. the dus1250xx product family provides an ultra wide input range to support 3.3v, 5v, and 12v bus voltage point-of-load applications and it offers up to 10a of output current in a vert ically mounted through-hole miniature package and the output can be resistor trimmed from 0.59vdc to 5 vdc. it provides a very cost effective, hi gh efficiency, and high density point of load solution. with creative design technology and optimization of component placement, these converte rs possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions.
ds_dus1250ex_10292008 2 technical specifications (ambient temperature=25c, minimum airflow=250lfm, nominal v in =12vdc unless otherwise specified.) parameter notes and conditions dus1250ex min. typ. max. units absolute maximum ratings input voltage 0 14 vdc operating temperature refer to fig.58 for the measuring point 0 50 c storage temperature -40 125 c input characteristics operating input voltage 2.97 13.2 v maximum input current 12vin, 5vo, operating, full load 4.5 a input reflected-ripple current 5 10 ma input voltage power on slew rate vin=5v, io=10a, vo=3.3v 1 v/ms vin=12v, io=10a, vo=3.3v or 5v 1 v/ms output characteristics output voltage adjustment range 0.59 5.0 vdc output voltage set point with a 1% trim resistor -3 +3 % output ripple, 20mhz bw, 12vin 10uf 1210 x2, 1uf 0805 x2 and 100nf 0603 x5 ceramic capacitor plus 470uf/6.3v pos cap vo Q 2.5 30 mvp-p same as above vo 2.5 50 mvp-p output current range 0 10 a output rise time 10% to 90% of vo 1 15 ms overshoot at turn-on/turn-off vin=12v, io=min~max 5 % of vo output dc current-limit inception hiccup mode 15 a dynamic characteristics output dynamic load response 12vin, 5vout, 470f ceramic cap positive step change in output current 70~100% load , 10a/us 130 mv negative step change in output current 100~70% load , 10a/us 130 mv recovery time recovery to within regulation band 200 s turn-on transient start-up time, from on/off control from enable high to 90% of vo 0 25 ms start-up time, from input power from vin=12v to 90% of vo 0 50 ms minimum output capacitance 0.9v and above 0 f 0.8v 22 f 0.7v 100 f 0.6v 220 f 0.59v 470 f maximum output startup capacitive load full load, 12vin, 5vo 1000 f efficiency vin=12v, io=10a vo=0.59v 64 % vo=1.5v 81 % vo=2.5v 86 % vo=3.3v 89 % vo=5.0v 91 % vin=5v, io=10a vo=0.59v 72 % vo=1.5v 85 % vo=2.5v 90 % vo=3.3v 92 % vin=3.3v, io=10a vo=0.59v 69 % vo=1.5v 83 % vo=2.5v 88 % feature characteristics switching frequency fixed 600 khz power good range pwrgd=high @ vo is in spec -9% 15% vo power good delay time from 90% of vo to 90% of power good output signal 0 10 ms power good rise time 10% to 90% of power good signal rise 0 1 ms on/off control positive logic (internally pulled high) logic high module on (or leave the pin open) 1.7 3.3 v logic low module off 0 0.8 v general specifications calculated mtbf 25 , 300lfm, 80% load 2 mhours weight 2.5 grams
ds_dus1250ex_10292008 3 electrical characteristics curves figure 1: output ripple & noise (vin=2.97v, vout= 0 .59v/10a, environment temp=2 5 ) figure 2: output ripple & noise (vin=3.63v, vout=1.5v/10a, environment temp=2 5 ) figure 3: output ripple & noise (vin=3.3v, vout=2.5v/ 10a, environment temp=2 5 ) figure 4: output ripple & noise (vin=5.5v, vout=0.59v/10a, environment temp=2 5 ) figure 5: output ripple & noise (vin=5.0v, vout=1.5v/10a , environment temp.=2 5 ) figure 6: output ripple & noise (vin=5.5v, vout=2.5v/10a , environment temp.=2 5 )
ds_dus1250ex_10292008 4 electrical characteristics curves (con.) figure 7: output ripple & noise (vin=5.5v, vout=3.3v/10a , environment temp.=25 ) figure 8: output ripple & noise (vin=12v, vout=0.59v/10a, environment temp.=25 ) figure 9: output ripple & noise (vin=12v, vout=1.5v/10a, environment temp.=2 5 ) figure 10: output ripple & noise (vin=13.2v, vout=2.5v/10a, environment temp.=2 5 ) figure 11: output ripple & noise (vin=12v, vout=3.3v/10a, environment temp.=2 5 ) figure 12: output ripple & noise (vin=13.2v, vout=5v/10a, environment temp.=2 5 )
ds_dus1250ex_10292008 5 electrical characteristics curves (con.) figure 13: turn on by vin (vin=3.3v, vout=0.59v/10a, ch2: vin, ch3: vout) figure 14: turn on by vin (vin=3.3v, vout=1.5v/10a, ch2: vin, ch3: vout) figure 15: turn on by vin (vin=3.3v, vout=2.5v/10a, ch2: vin, ch3: vout) figure 16: turn on by vin (vin=5v, vout=0.59v/10a, ch2: vin, ch3: vout) figure 17: turn on by vin (vin=5v, vout=1.5v/10a, ch2: vin, ch3: vout) figure 18: turn on by vin (vin=5v, vout=2.5v/10a, ch2: vin, ch3: vout)
ds_dus1250ex_10292008 6 electrical characteristics curves (con.) figure 19: turn on by vin (vin=5v, vout=3.3v/10a, ch2: vin, ch3: vout) figure 20: turn on by vin (vin=12v, vout=0.59v/10a, ch2: vin, ch3: vout) figure 21: turn on by vin (vin=12v, vout=1.5v/10a, ch2: vin, ch3: vout) figure 22: turn on by vin (vin=12v, vout=2.5v/10a, ch2: vin, ch3: vout) figure 23: turn on by vin (vin=12v, vout=3.3v/10a, ch2: vin, ch3: vout) figure 24: turn on by vin (vin=12v, vout=5v/10a, ch2: vin, ch3: vout)
ds_dus1250ex_10292008 7 electrical characteristics curves (con.) figure 25: turn on by on/off (vin=3.3v, vout=0.59v/10a, ch2: vin, ch3: vout) figure 26: turn on by on/off (vin=3.3v, vout=1.5v/10a, ch2: vin, ch3: vout) figure 27: turn on by on/off (vin=3.3v, vout=2.5v/10a, ch2: vin, ch3: vout) figure 28: turn on by on/off (vin=5v, vout=0.59v/10a, ch2: vin, ch3: vout) figure 29: turn on by on/off (vin=5v, vout=1.5v/10a, ch2: vin, ch3: vout) figure 30: turn on by on/off (vin=5v, vout=2.5v/10a, ch2: vin, ch3: vout)
ds_dus1250ex_10292008 8 electrical characteristics curves (con.) figure 31: turn on by on/off (vin=5v, vout=3.3v/10a, ch2: vin, ch3: vout) figure 32: turn on by on/off (vin=12v, vout=0.59v/10a, ch2: vin, ch3: vout) figure 33: turn on by on/off (vin=12v, vout=1.5v/10a, ch2: vin, ch3: vout) figure 34: turn on by on/off (vin=12v, vout=2.5v/10a, ch2: vin, ch3: vout) figure 35: turn on by on/off (vin=12v, vout=3.3v/10a, ch2: vin, ch3: vout) figure 36: turn on by on/off (vin=12v, vout=5v/10a, ch2: vin, ch3: vout)
ds_dus1250ex_10292008 9 electrical characteristics curves (con.) figure 37: turn on overshoot (vin=3.3v, vout=0.59v/10a, ch2: vout (turn on by oe)) figure 38: turn on overshoot (vin=3.3v, vout=1.5v/10a, ch2: vout (turn on by oe)) figure 39: turn on overshoot (vin=3.3v, vout=2.5v/10a, ch2: vout (turn on by oe)) figure 40: turn on overshoot (vin=5v, vout=0.59v/10a, ch2: vout (turn on by oe)) figure 41: turn on overshoot (vin=5v, vout=1.5v/10a, ch2: vout (turn on by oe)) figure 42: turn on overshoot (vin=5v, vout=2.5v/10a, ch2: vout (turn on by oe))
ds_dus1250ex_10292008 10 electrical characteristics curves (con.) figure 43: turn on overshoot (vin=5v, vout=3.3v/10a, ch2: vout (turn on by oe)) figure 44: turn on overshoot (vin=12v, vout=0.59v/10a, ch2: vout (turn on by oe)) figure 45: turn on overshoot (vin=12v, vout=1.5v/10a, ch2: vout (turn on by oe)) figure 46: turn on overshoot (vin=12v, vout=2.5v/10a, ch2: vout (turn on by oe)) figure 47: turn on overshoot (vin=12v, vout=3.3v/10a, ch2: vout (turn on by oe)) figure 48: turn on overshoot (vin=12v, vout=5v/10a, ch2: vout (turn on by oe))
ds_dus1250ex_10292008 11 electrical characteristics curves (con.) figure 49: power good delay time by on/off (vin=3.3v, vout=0.59v/ 10a, ch2: vout, ch3:pg ) figure 50: power good delay time by on/off (vin=3.3v, vout=2.5v/ 10a, ch2: vout, ch3:pg ) figure 51: power good delay time by on/off (vin=5v, vout=0.59v/10a, ch2: vout, ch3:pg ) figure 52: power good delay time by on/off (vin=5v, vout=3.3v/10a, ch2: vout, ch3:pg ) figure 53: power good delay time by on/off (vin=12v, vout=0.59v/10a, ch2: vout, ch3:pg ) figure 54: power good delay time by on/off (vin=12v, vout=5v/10a, ch2: vout, ch3:pg )
ds_dus1250ex_10292008 12 features descriptions enable (on/off) positive enable is available as standard. the sip regulator accepts an open collector, open drain signal to enable the output. the sip regulator pulls the enable signal up to 3.3v or less. when enable is pulled down to 0.4v or less by the host, the sip regulator will remain off. the host must be able to sink 0.5 ma, minimum, for a logic low. power good the sip regulator will provide an open collector power good signal. this signal will be open collector and 3.3v compatable. the converter will sink less than 1ua as a logic high and sink at least 1ma as a logic low. a logic low will be less than 0.4v while sinking 1ma. signal transistions, with a 10k ohm resistor pulling the output to 3.3v, will be clean (glitch free) and bounce free. the rise/fall time can be no slower than 5usec, measured at 10% and 90% points. power good will transition to the open state between 1 msec and 10 msec of the output voltage reaching it?s regulation. this signal should transition to low before the output falls out of requlation. any voltage glitch on power good signal is limited to less than 0.4v while the signal is at its high or low state. power good monitors the output voltage. when the output voltage is within +/- 15% of nominal, power good will be high. otherwise, it will be low. note to host: power good is indeterminate and must be ignored when vin to the sip is below 3.0v. design considerations the dus1250ex is a single phase and voltage mode controlled buck topology. the output can be trimmed in the range of 0.59vdc to 5vdc by a resistor from trim pin to ground. the converter can be turned on/off by remote control with positive on/off (enable pin) logic. the converter dc output is disabled when the signal is driven low (below 0.8v). the module will turn on when this pin is floating and the input voltage is higher than the threshold. the converter can protect it self by entering hiccup mode against over current and short circuit condition. also, the converter will shut down when an over voltage protection is detected. safety considerations it is recommended that the user to provide a very fast-acting type fuse in the input line for safety. the output voltage set-point and the output current in the application could define the amperage rating of the fuse. reflected ripple current and output ripple and noise measurement the measurement set-up outlined in figure 55 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on dus1250ex series converters. vout vin 100n cs cin cout output voltage ripple&noise measurement point input reflected current measurement point 10u 1u 1 2 ltest dc-dc converter cs=270 f*1, ltest=2uh, cin=270 f*1 figure 55: input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for dus1250ex
ds_dus1250ex_10292008 13 features descriptions (con.) over-current and short-circuit protection the dus1250ex series modules have non-latching over-current and short-circuit protection circuitry. when over current condition occurs, the module goes into the non-latching hiccup mode. when the over-current condition is removed, the module will resume normal operation. vin temperature vout ocp 0.59v 1.5v 2.5v 3.3v 5.0v cold start 15.0 15.0 13.8 3.3 thermal 13.3 13.7 13.6 cold start 17.1 17.3 17.5 18.4 5.0 thermal 16.0 16.0 16.5 17.4 cold start 16.9 17.0 16.6 17.2 17.4 12.0 25 thermal 15.4 15.3 14.9 15.0 15.1 cold start 13.9 13.9 13.9 3.3 thermal 12.0 12.8 13.7 cold start 15.7 15.9 16.5 17.1 5.0 thermal 14.6 14.6 15.3 16.0 cold start 16.3 15.9 15.8 15.8 16.3 12.0 50 thermal 14.2 13.9 13.8 13.6 13.8 output capacitance there is output capacitor on the dus1250ex series modules. hence, an external output capacitor is not required for stable operation for 0.9v and above. please see page 2 for minimum output capacitance required for 0.59v to 0.8v output stable operation. paralleling dus1250ex converters do not have built-in current sharing (paralleling) ability. hence, paralleling of multiple dus1250ex converters are not recommended. output voltage programming the output voltage of the dus1250ex series is trimmable by connecting an external resistor between the trim pin and output ground as shown figure 56 and the typical trim resistor values are shown in table 1. vin vout enable ground ground trim dus1250ex rs figure 56: trimming output voltage the dus1250ex module has a trim range of 1.0v to 3.3v. the trim resistor equation for the dus1250ex is : 59 . 0 1180 ) ( ? = vout rs vout is the output voltage setpoint rs is the resistance between trim and ground rs values should not be less than 240 ? output voltage rs ( ? ) 0.59v open +1.5 v 1.3k +2.5 v 618 +3.3 v 435 +5.0v 267 table 1: typical trim resistor values dus1250ex
ds_dus1250ex_10292008 14 thermal curves (dus1250ex) figure 58: hot spot temperature measured point (unit of length is mm) the allowed maximum hot spot temperature is defined at 115 dus1250xx series output current vs. ambient temperature and air velocity @ vin =12v, vout =5v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural convection 600lfm figure 59: output current vs. ambient te mperature and air velocity @vin=12v, vout=5v dus1250xx series output current vs. ambient temperature and air velocity @ vin =12v, vout =3.3v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural co nve ction 600lfm figure 60: output current vs. ambi ent temperature and air velocity@ vin=12v, vout=3.3v thermal consideration 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 wind tunnels that simulate the thermal environments encountered in most electronics equipment. 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. 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. note: wind tunnel test setup figure dimensions are in millimeters and (inches) 12.7 (0.5?) module a ir flow 50.8 ( 2.0? ) facing pwb pwb air velocit y and ambien t temperature measured below the module note: wind tunnel test setup figure dimensions are in millimeters and (inches) figure 57: wind tunnel test setup
ds_dus1250ex_10292008 15 thermal curves (dus1250ex) dus1250xx series output current vs. ambient temperature and air velocity @ vin =12v, vout =2.5v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural convection 600lfm figure 61: output current vs. ambient temperature and air velocity @vin=12v, vout=2.5v dus1250xx series output current vs. ambient temperature and air velocity @ vin =12v, vout =1.5v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural convection 600lfm figure 62: output current vs. ambi ent temperature and air velocity@ vin=12v, vout=1.5v dus1250xx series output current vs. ambient temperature and air velocity @ vin =5v, vout =3.3v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural convection 600lfm figure 63: output current vs. ambi ent temperature and air velocity@ vin=5v, vout=3.3v dus1250xx series output current vs. ambient temperature and air velocity @ vin =5v, vout =2.5v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural convection 600lfm figure 64: output current vs. ambient temperature and air velocity @vin=5v, vout=2.5v dus1250xx series output current vs. ambient temperature and air velocity @ vin =5v, vout =1.5v 0 2 4 6 8 10 12 25 35 45 55 65 75 85 ambient temperature ( ) output current (a) 200lfm 100lfm 300lfm 500lfm 400lfm natural convection 600lfm figure 65: output current vs. ambient temperature and air velocity @vin=5v, vout=1.5v
ds_dus1250ex_10292008 16 mechanica l drawing
ds_dus1250ex_10292008 17 model list model name leed free comparable input voltage output voltage output current DUS1250EF rohs 5 2.97v~ 13.2v 0.59v~5v 10a dus1250eg rohs 6 2.97v~ 13.2v 0.59v~5v 10a 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: telephone: +41 31 998 53 11 fax: +41 31 998 53 53 email: dcdc@delta-es.tw asia & the rest of world: telephone: +886 3 4526107 ext. 6220 fax: +886 3 4513485 email: dcdc@delta.com.tw warranty delta offers a two (2) year limited warranty. complete warranty information is listed on our web site or is available upon request from delta. information furnished by delta is believed to be accurate and reliable. however, no responsibility is assumed by delta for its use, nor for any infringements of patents or other rights of third parties, which may result from its use. no license is granted by implication or otherwise under any patent or pat ent rights of delta. delta reserves the right to revise these specifications at any time, without notice .

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