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datasheet ds_ne12s20a_08042011 features ? high efficiency: 94.0% @ 12vin, 5v/20a out ? size: vertical: 30.5x15.5x12.0mm (1.20?x0.61?x0.47?) horizontal: 30.5x15.5x12.9mm (1.20?x0.61?x0.51?) ? wide input range: 4.5v~13.8v ? output voltage programmable from 0.59vdc to 5.1vdc via external resistors ? voltage and resistor-based trim ? no minimum load required ? fixed frequency operation ? input uvlo, output ocp ? remote on/off (positive) ? iso 9001, tl 9000, iso 14001, qs9000, ohsas18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada) recognized applications ? datacom ? distributed power architectures ? servers and workstations ? lan/wan applications ? data processing applications options ? vertical or horizontal versions delphi ne series non-isolated point of load dc/dc modules: 4.5v~13.8vin, 0.59v~5.1vout, 20a the delphi ne 20a series, 4.5 to 13.8v wide input, wide trim single output, non-isolated point of load dc/dc converters are the latest offering from a world leader in power systems technology and manufacturing ?x delta electronics, inc. the nd/ne product family is the second generation, non-isolated point-of-load dc/dc power modules for the datacom applications which cut the module size by almost 50% in most of the cases compared to the first generation nc series pol modules. the product family here provides 20a of output current in a vertically or horizontally mounted through-hole package and the output can be resistor trimmed from 0.59vdc to 5.1vdc. it provides a very cost effective, high efficiency, and high density point of load solution. with creative design technology and optimization of component placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions.
ds_ne12s20a_08042011 2 technical specifications (ambient temperature=25c, minimum airflow=200lfm, nominal v in =12vdc unless otherwise specified.) parameter notes and conditions ne12s0a0v/h20 min. typ. max. units absolute maximum ratings input voltage operation 4.5 13.8 vdc operating temperature (vertical) refer to fig.25 for the measuring point -40 130 c storage temperature -55 125 c input characteristics operating input voltage 4.5 13.8 v input under-voltage lockout turn-on voltage threshold 4.3 v turn-off voltage threshold 3.3 v lockout hysteresis voltage 1.0 v maximum input current 12vin, 5vo, operating, full load 8.9 a no-load input current vin=12v, vout=5v 150 ma off converter input current remote off 10 ma input reflected-ripple current p-p thru 2uh inductor 5hz to 20mhz 30 ma input ripple rejection 120hz 60 db output characteristics output voltage adjustment range 0.59 5.1 v output voltage set point with a 0.1% trim resistor -1 +1 %vo output voltage regulation over load io=io_min to io_max -0.5 +0.5 %vo over line vin=vin_min to vin_max -0.2 +0.2 %vo over temperature ta=0c to 70c -0.3 +0.3 %vo total output range over load, line, temperature regulation and set point -2.0 +2.0 %vo output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak full load, 10uf tan cap, 12vin, 5vo 20 mv rms full load, 10uf tan cap, 12vin, 5vo 5 mv output current range 0 20 a output voltage under-shoot at power-off vin=12v, turn off 100 mv output short-circuit current, rms value continuous 3.6 a output dc current-limit inception hiccup mode 110 200 %iomax dynamic characteristics output dynamic load response 12vin, 2.5vout, 10f ceramic cap positive step change in output current 75~100% load , 5a/us 200 mv negative step change in output current 100~75% load , 5a/us 200 mv settling time settling to be within regulation band (to 10% vo deviation) 100 s turn-on transient start-up time, from on/off control from enable high to 90% of vo 2 3 ms start-up time, from input power from vin=12v to 90% of vo 2 3 ms minimum output capacitance 0 f 5.0vo,maximum output capacitance turn on overshoot <1% vo ,esr ?y 1m ? 2000 f efficiency vo=0.59v vin=12v, io=20a 75 % vo=0.9v vin=12v, io=20a 80.5 % vo=2.5v vin=12v, io=20a 91 % vo=5.0v vin=12v, io=20a 94 % sink efficiency vo=5.0v vin=12v, io=20a 92 % feature characteristics switching frequency fixed 500 khz on/off control positive logic (internally pulled high) logic high module on (or leave the pin open) 0.8 5.0 v logic low module off 0 0.3 v general specifications calculated mtbf 25 j , 300lfm, 80% load 9.8 mhours weight 8.8 grams
ds_ne12s20a_08042011 3 electrical characteristics curves 55 60 65 70 75 80 85 90 95 1 2 4 6 8 101214161820 output current (a) efficiency (%) 55 60 65 70 75 80 85 90 95 1 2 4 6 8 101214161820 output current (a) efficiency (%) figure 1: converter efficiency vs. output current (0.59v output voltage, 12v input) figure 2: converter efficiency vs. output current (0.9v output voltage, 12v input) 55 60 65 70 75 80 85 90 95 1 2 4 6 8 101214161820 output current (a) efficiency (%) 55 60 65 70 75 80 85 90 95 1 2 4 6 8 10 12 14 16 18 20 output current (a) efficiency (%) figure 3: converter efficiency vs. output current (1.5v output voltage, 12v input) figure 4: converter efficiency vs. output current (2.5v output voltage, 12v input) 55 60 65 70 75 80 85 90 95 1 2 4 6 8 101214161820 output current (a) efficiency (%) 55 60 65 70 75 80 85 90 95 1 2 4 6 8 101214161820 output current (a) efficiency (%) figure 5: converter efficiency vs. output current (3.3v output voltage, 12v input) figure 6: converter efficiency vs. output current (5.0v output voltage, 12v input)
ds_ne12s20a_08042011 4 electrical characteristics curves (con.) figure 7: output ripple & noise at 12vin, 0.59v/20a out figure 8: output ripple & noise at 12vin, 0.9v/20a out figure 9: output ripple & noise at 12vin, 1.5v/20a out figure 10: output ripple & noise at 12vin, 2.5v/20a out figure 11: output ripple & noise at 12vin, 3.3v/20a out figure 12: output ripple & noise at 12vin, 5.0v/20a out
ds_ne12s20a_08042011 5 electrical characteristics curves (con.) figure 13: turn on delay time at 12vin, 0.59v/20a out ch1: vin, ch4: vout figure 14: turn on delay time remote on/off, 2.5v/20a out ch1: enable, ch4: vout figure 15: turn on delay time at 12vin, 3.3v/20a out ch1: vin, ch4: vout figure 16: turn on delay time at remote on/off, 5.0v/20a out ch1: enable, ch4: vout figure 17: typical transient response to step load change at 5a/s from 75%~100% load, at 12vin, 2.5v out 0 0 0 0 0 0 0 0
ds_ne12s20a_08042011 6 features descriptions enable (on/off) the enable (on/off) input allows external circuitry to put the ne converter into a low power dissipation (sleep) mode. positive enable is available as standard. with the active high function, the output is guaranteed to turn on if the enable pin is driven above 0.8v. the output will turn off if the enable pin voltage is pulled below 0.3v the enable pin is also used as input uvlo function. leaving the enable floating, the module will turn on if the input voltage is higher than turn on threshold and turn off if the input voltage is lower than turn off threshold. the d efault turn-on voltage is 4.3v with 1v hysteresis. the turn-on voltage may be adjusted with a resistor placed between the ?enable? pin and ?ground? pin. the formula for calculating the value of this resistor is: 5 . 1 2 . 18 ) 2 . 18 ( 50 _ + + = r r v rth en 1 _ _ ? = rth en fth en v v ne20a r enable fig. 18 . enable por circuit. fth en v _ is the falling threshold rth en v _ is the rising threshold that you want. r (kohm) is the outen resistor that you connect from enable pin to the gnd also, you will see an active high voltage will disable the input uvlo function design considerations the ne12s0a0v(h)20 uses a single phase and voltage mode controlled buck topology. the output can be trimmed in the range of 0.59vdc to 5.1vdc 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 0.3v). this pin is also used as the input turn on threshold judgment. its voltage is percent of input voltage during floating due to internal connection. so we do not suggest using an active high signal (higher than 0.8v) to turn on the module because this high level voltage will disable uvlo function. the module will turn on when this pin is floating and the input voltage is higher than the threshold. the converter can protect itself 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.
ds_ne12s20a_08042011 7 features descriptions (con.) the enable input can be driven in a variety of ways as shown in figures 19 and 20. if the enable signal comes from the primary side of the circuit, the enable can be driven through either a bipolar signal transistor (figure 18).if the enable signal comes from the secondary side, then an opto-coupler or other isolation devices must be used to bring the signal across the voltage isolation (please see figure 19). nd6a/10a vout ground trim enable ground vin figure 19: enable input drive circuit for ne series ground ground nd 6a/10a vin vout trim enable figure 20 : enable input drive circuit example with isolation. input under-voltage lockout the input under-voltage lockout prevents the converter from being damaged while operating when the input voltage is too low. the lockout occurs between 3.3v to 4.3v. over-current and short-circuit protection the ne 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. an over current condition is detected by measuring the voltage drop across the mosfets. the voltage drop across the mosfet is also a function of the mosfet?s rds(on). rds(on) is affected by temperature, therefore ambient temperature will affect the current limit inception point. the detection of the rds(on) of mosfets also acts as an over temperature protection since high temperature will cause the rds(on) of the mosfets to increase, eventually triggering over-current protection. output voltage programming the output voltage of the ne series is trimmable by connecting an external resistor between the trim pin and output ground as shown figure 21 and the typical trim resistor values are shown in table 1. vin vout enable ground ground trim nd 6a/10a rs figure 21: trimming output voltage the ne20 module has a trim range of 0.59v to 5.0v. the trim resistor equation for the ne20a is: 591 . 0 1182 ) ( ? = ? 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 v 2.9k +1.5 v 1.3k +2.5 v 619 +3.3 v 436 +5.0v 268 table 1: typical trim resistor values ne20a ne 2 0a ne 2 0a
ds_ne12s20a_08042011 8 output capacitance there is internal output capacitor on the ne series modules. hence, no external output capacitor is required for stable operation. reflected ripple current and output ripple and noise measurement the measurement set-up outlined in figure 23 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on ne series converters. dc-dc converter 1uf ceramic tan 10uf vin+ load ltest cs cin output voltage ripple noise measurement point input reflected current measurement point cs=270 f*1, ltest=2uh, cin=270 f*1 figure 23: input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for ne20 features descriptions (con.) voltage margining adjustment output voltage margin adjusting can be implemented in the ne modules by connecting a resistor, r margin-up , from the trim pin to the ground for margining up the output voltage. also, the output voltage can be adjusted lower by connecting a resistor, r margin-down , from the trim pin to the voltage source vt. figure 22 shows the circuit configuration for output voltage margining adjustment. vt vin vout enable ground ground trim nd 6a/10a rmargin-down rs rmargin-up figure 22: circuit configuration for output voltage margining paralleling ne20 converters do not have built-in current sharing (paralleling) ability. hence, paralleling of multiple ne20 converter is not recommended. ne20 a
ds_ne12s20a_08042011 9 thermal curves (ne12s0a0v20) figure 25: temperature measurement location* the allowed maximum hot spot temperature is defined at 130 j ne12s0a0v20(standard) output current vs. ambient temperature and air velocity @vin=12v vout=5.0v (through pwb orientation) 0 2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection 100lfm 200lfm ambient tem p erature ( ?? ) output current (a) 500lfm 400lfm 600lfm 300lfm figure 26: output current vs. ambient temperature and air velocity @vin=12v, vout=5.0v (through pwb orientation) ne12s0a0v20(standard) output current vs. ambient temperature and air velocity @vin=12v vout=2.5v (through pwb orientation) 0 2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection 100lfm 200lfm ambient temperature ( j ) output current (a) 500lfm 400lfm 600lfm 300lfm figure 27: output current vs. ambient temperature and air velocity@ vin=12v, vout=2.5v (through pwb orientation) 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 module. 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 that simulate the thermal environments encountered in most electronics equipment. this type of equipment commonly uses vertically mounted circuit cards 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 module is constantly kept at 6.35mm (0.25??). 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. module a ir flow 11 (0.43?) 50.8 (2.0?) facing pwb pwb a ir velocity a nd ambient temperature measured below the module 22 (0.87?) note: wind tunnel test setup figure dimensions are in millimeters and (inches) figure 24: wind tunnel test setup
ds_ne12s20a_08042011 10 thermal curves (ne12s0a0v20) ne12s0a0v20(standard) output current vs. ambient temperature and air velocity @vin=5.0v vout=2.5v (through pwb orientation) 0 2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection 100lfm 200lfm ambient temperature ( j ) output current (a) 500lfm 400lfm 600lfm 300lfm figure 28: output current vs. ambient temperature and air velocity@ vin=5.0v, vout=2.5v (through pwb orientation) ne12s0a0v20(standard) output current vs. ambient temperature and air velocity @vin=12v vout=0.9v (through pwb orientation) 0 2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection 100lfm 200lfm ambient temperature ( ) output current (a) 500lfm 400lfm 300lfm figure 29: output current vs. ambient temperature and air velocity @vin=12v, vout=0.9v (through pwb orientation) ne12s0a0v20(standard) output current vs. ambient temperature and air velocity @vin=5.0v vout=0.9v (through pwb orientation) 0 2 4 6 8 10 12 14 16 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection 100lfm 200lfm ambient temperature ( j ) output current (a) 400lfm 300lfm figure 30: output current vs. ambient temperature and air velocity@ vin=5.0v, vout=0.9v (through pwb orientation)
ds_ne12s20a_08042011 11 mechanical drawing vertical horizontal
ds_ne12s20a_08042011 12 part numbering system model list model name packaging input voltage output voltage output current efficiency 12vin @ 100% load ne12s0a0v20pnfa vertical 4.5v~ 13.8vdc 0.59v~ 5.1vdc 20a 94.0%@5vout 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. 6220~6224 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 patent rights of delta. delta reserves the right to revise these specifications at any time, without notice . ne 12 s 0a0 v 20 p n f a product series input voltage number of outputs output voltage mounting output current on/off logic pin length option code ne- non-isolated series 12- 4.5~13.8v s- single output 0a0 - programmable v- vertical 20-20a p- positive n- negative n- 0.150? f- rohs 6/6 (lead free) a-standard function

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