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preliminary datasheet ds_ne12s03a_10032008 features ? high efficiency: 92.5% @ 12vin, 5v/3a out ? size: vertical: 9.4x15.5x6.6 mm (0.37?x0.61?x0.26?) horizontal: 9.4x15.5x7.9mm (0.37?x0.61?x0.31?) ? wide input range: 3.1v~13.8v ? output voltage programmable from 0.59vdc to 5.0vdc via external resistors ? no minimum load required ? fixed frequency operation ? input uvlo, output ocp ? remote on/off (positive, 5 pin version) ? iso 9001, tl 9000, iso 14001, qs9000, ohsas18001 certified manufacturing facility ? ul/cul 60950-1 (us & canada), and tuv (en60950-1) - pending 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: 3.1~13.8vin, 0.59v-5.1vout, 3aout the delphi ne 3a series, 3.1~13.8v wide input, 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, inc. the ne 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 ne 3a product family provides an ultra wide input range to support 3.3v, 5v, 8v, 9.6v, and 12v bus voltage point-of-load applications and it offers up to 3a of output current in a vertically or horizontally mounted through-hole miniature package and the output can be resistor trimmed from 0.59vdc to 5.0vdc. it provides a very cost effective, high efficiency, and high den sity point of load solution. with creative design technology and optimization of component placement, these converters poss ess outstanding electrical and thermal performance, as well as extremely high reliability under highly stressful operating conditions.
ds_ne12s03a_10032008 2 technical specifications (ambient temperature=25c, minimum airflow=200lfm, nominal v in =12vdc unless otherwise specified.) parameter notes and conditions ne12s0a0v/h03 min. typ. max. units absolute maximum ratings input voltage opeation 3.0 13.8 vdc operating temperature (vertical) refer to fig.34 for the measuring point -40 123 c operating temperature (horizontal) refer to fig.42 for the measuring point -40 tbd c storage temperature -40 125 c when vin<5v 3.3 v enable voltage when vin>5v 5.0 v input characteristics operating input voltage 3.0 13.8 v input uvlo turn on threshold total load range turn on 3.0 input uvlo turn off threshold total load range turn off 2.7 v input uvlo hysteresis 0.3 v maximum input current 5.0vout, operating, full load 3.1 a off converter input current remote off, total input range 15 ma no-load input current total input range 50 ma input reflected-ripple external current total input range 15 25 ma input voltage rejection 120hz 60 db input voltage variation 120hz 1 v/ms inrush current high line input and zero load 1 a2s output characteristics output voltage adjustment range see figure30 0.59 5.0 v output voltage set point with a 0.1% trim resistor -1 +1 % output voltage load regulation io=io_min to io_max -0.5 +0.5 % output voltage line regulation vin=vin_min to vin_max -0.2 +0.2 % output voltage temperature regulation ta=0~85c -0.6 +0.6 % total output range over load, line, temperature regulation and set point -3 +3 % output voltage ripple and noise full load 20mhz bandwidth with 1uf and 10uf ceramic capacitor peak-to-peak total input range , 0.59vout 10 20 mv peak-to-peak total input range , 0.9vout 15 25 mv peak-to-peak total input range , 1.8vout 20 30 mv peak-to-peak total input range , 2.5vout 25 35 mv peak-to-peak total input range , 3.3vout 30 40 mv peak-to-peak total input range , 5.0vout 40 50 mv rms full load, 10uf tan cap, 12vin, 5vo 10 15 mv output current range 0 3 a output voltage over-shoot at start-up total input range, turn on 0.5 %vo output voltage under-shoot at power-off total input range, turn off 100 mv output current limitation hiccup mode 6 a dynamic characteristics co=1uf ceramic//10uf ceramic capacitor output dynamic load response 0.59vout, step change in output current load change between 50%io and 100%io, slew rate 10a/us 130 mv 0.59vout, setting time deviation decrease to 1%vout 15 us 0.9vout, step change in output current load change between 50%io and 100%io, slew rate 10a/us 150 mv 0.9vout, setting time deviation decrease to 1%vout 15 us 2.5vout, step change in output current load change between 50%io and 100%io, slew rate 10a/us 175 mv 2.5vout, setting time deviation decrease to 1%vout 15 us 5vout, step change in output current load change between 50%io and 100%io, slew rate 10a/us 230 mv 5vout, setting time deviation decrease to 1%vout 15 us turn on transient turn on delay by enable from enable high to 90% of vo 2 3 ms turn on delay by vin from vin=uvlo_on to 90% of vo 2 3 ms turn on rise time 1.5 2 ms 0.9vout, maximum output capacitor turn on overshoot <1% vo ,esr 1m ? 1500 f 2.5vout, maximum output capacitor turn on overshoot <1% vo ,esr 1m ? 1000 f 5.0vout, maximum output capacitor turn on overshoot <1% vo ,esr 1m ? 500 uf minimum output capacitive load 0 f efficiency 0.59vout vin=3.3v, io=3a 65.5 % 0.59vout vin=12v, io=3a 65 % 0.9vout vin=3.3v, io=3a 74.5 % 0.9vout vin=12v, io=3a 73.5 % 1.8vout vin=3.3v, io=3a 85.5 % 1.8vout vin=12v, io=3a 83.5 % 2.5vout vin=3.3v, io=3a 89.5 % 2.5vout vin=12v, io=3a 86 % 5.0vout vin=12v, io=3a 92.5 % 5.0vout vin=12v, io=3a, sink efficiency 91 % feature characteristics switching frequency fixed 500 khz high level input voltage module on (or leave the pin open) 1.0 5.5 v low level input voltage module off -0.3 0.4 v general specifications calculated mtbf ta = 2 5 , 200lfm, 80% load tbd mhours weight 1.4 grams
ds_ne12s03a_10032008 3 electrical characteristics curve 35 45 55 65 75 85 95 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 output current (a) efficiency (%) 12vin 5vin 3.3vin 35 45 55 65 75 85 95 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 output current (a) efficiency (%) 12vin 5vin 3.3vin figure 1: converter efficiency vs. output current (0.59v output voltage, 3.3v/5v/12v input voltage) figure 2: converter efficiency vs. output current (0.9v output voltage, 3.3v/5v/12v input voltage) 35 45 55 65 75 85 95 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 output current (a) efficiency (%) 12vin 5vin 3.3vin 35 45 55 65 75 85 95 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 output current (a) efficiency (%) 12vin 5vin 3.3vin figure 3: converter efficiency vs. output current (1.8v output voltage, 3.3v/5v/12v input voltage) figure 4: converter efficiency vs. output current (2.5v output voltage, 3.3v/5v/12v input voltage) 35 45 55 65 75 85 95 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 output current (a) efficiency (%) 12vin 5vin 35 45 55 65 75 85 95 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 output current (a) efficiency (%) 12vin figure 5: converter efficiency vs. output current (3.3v output voltage, 5v/12v input voltage) figure 6: converter efficiency vs. output current (5.0v output voltage, 12v input voltage)
ds_ne12s03a_10032008 4 electrical characteristics curves (con.) figure 7: output ripple & noise at 12vin, 0.59v/3a out (20mv/div, 2us/div) figure 8: output ripple & noise at 12vin, 0.9v/3a out (20mv/div, 2us/div) figure 9: output ripple & noise at 12vin, 1.8v/3a out (20mv/div, 2us/div) figure 10: output ripple & noise at 12vin, 2.5v/3a out (20mv/div, 2us/div) figure 11: output ripple & noise at 12vin, 3.3v/3a out (20mv/div, 2us/div) figure 12: output ripple & noise at 12vin, 5.0v/3a out (20mv/div, 2us/div)
ds_ne12s03a_10032008 5 electrical characteristics curves (con.) figure 13: turn on delay time at 12vin, 0.59v/3a out ch1: vin(5v/div) ch4: vout(0.5v/div) 5ms/div figure 14: turn on delay time remote on/off, 0.59v/3a out ch1: enable(1v/div) ch4: vout(0.5v/div) 5ms/div figure 15: turn on delay time at 12vin, 0.9v/3a out ch1: vin(5v/div) ch4: vout(0.5v/div) 5ms/div figure 16: turn on delay time at remote on/off, 0.9v/3a out ch1: enable(1v/div) ch4: vout(0.5v/div) 5ms/div figure 17: turn on delay time at 12vin, 2.5v/3a out ch1: vin(5v/div) ch4: vout(2v/div) 5ms/div figure 18: turn on delay time at remote on/off, 2.5v/3a out ch1: enable(1v/div) ch4: vout(2v/div) 5ms/div
ds_ne12s03a_10032008 6 figure 19: turn on delay time at 12vin, 5v/3a out ch1: vin(5v/div) ch4: vout(2v/div) 5ms/div figure 20: turn on delay time at remote on/off, 5v/3a out ch1: enable(1v/div) ch4: vout(2v/div) 5ms/div figure 21: typical transient response to step load change at 10a/ s between 50% and 100% load, at 12vin, 0.59v out; ch2: vout(0.1v/div), ch4: iout (0.5a/div), 100us/div figure 22: typical transient response to step load change at 10a/ s between 50% to 100% load, at 12vin, 0.9v out ch2: vout(0.1v/div), ch4: i out (0.5a/div), 100us/div figure 23: typical transient response to step load change at 10a/ s between 50% to 100% load, at 12vin, 2.5v out ch2: vout(0.1v/div), ch4: i out (0.5a/div), 100us/div figure 24: typical transient response to step load change at 10a/ s between 50% to 100% load, at 12vin, 5.0v out ch2: vout(0.1v/div), ch4: i out (0.5a/div), 100us/div 1.5a 1.5a 1.5a 1.5a
ds_ne12s03a_10032008 7 design considerations the ne12s0a0v(h)03 uses a single phase and voltage mode controlled buck topology. the output can be trimmed from 0.59vdc to 5.0vdc 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 0.4v). 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 1.0v) 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. 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 1.0v. the output will turn off if the enable pin voltage is pulled below 0.4v. undervoltage lockout 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 the turn-on threshold and turn off if the input voltage is lower than the turn-off threshold. the d efault turn-on voltage is 3.0v with 300mv hysteresis. the turn-on voltage may be adjusted with a resistor placed between the ?enable? pin and ?ground? pin. the equation for calculating the value of this resistor is: ( ) 5 . 0 46 . 6 46 . 6 05 . 15 _ + + = r r v rth en v v v rth en fth en 3 . 0 _ _ ? = fth en v _ is the turn-off threshold rth en v _ is the turn-on threshold r (kohm) is the outen resistor connected from enable pin to the gnd ne3a r enable fig. 25 . uvlo setting an active high voltage will disable the input uvlo function.
ds_ne12s03a_10032008 8 features descriptions (con.) the enable input can be driven in a variety of ways as shown in figures 26 and 27. if the enable signal comes from the primary side of the circuit, the enable can be driven through either a bipolar signal transistor (figure 26).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 27). nd6a/10a vout ground trim enable ground vin figure 26: enable input drive circuit for ne series ground ground nd 6a/10a vin vout trim enable figure 27 : 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 2.7v to 3.0v. 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 28 and the typical trim resistor values are shown in figure 29 vin vout enable ground ground trim nd 6a/10a rs figure 28: trimming output voltage the ne03 module has a trim range of 0.59v to 5.0v. the trim resistor equation for the ne03a 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 268 ? output voltage rs ( ? ) 0.59v open +0.9 v 3.82k +1.8 v 978 +2.5 v 619 +3.3 v 436 +5.0v 268 figure 29: typical trim resistor values the relationship between input voltage and output voltage shown as figure 30 vout vin 0.59v 0.9v 1.8v 2.5v 3.3v 5.0v 3.3v y y y y n n 5.0v y y y y y n 8.0v y y y y y y 12v y y y y y y figure 30: relationship between vin vs vout ne3a ne3 a ne3a
ds_ne12s03a_10032008 9 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 32 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 ta n 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 32: input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for ne03 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 31 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 31: circuit configuration for output voltage margining paralleling ne03 converters do not have built-in current sharing (paralleling) ability. hence, paralleling of multiple ne03 converters is not recommended. ne3a
ds_ne12s03a_10032008 10 thermal curves (vertical) figure 34: temperature measurement location* the allowed maximum hot spot temper ature is defined at 123 ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=3.3v vout=0.9v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection output current (a) ambient temperature ( ) figure 35: output current vs. ambient temperature and air velocity @vin=3.3v, vout=0.9v (airflow from pin5 to pin1) ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=5.0v vout=0.9v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection output current (a) ambient temperature ( ) figure 36: output current vs. ambi ent temperature and air velocity @vin=5.0v, vout=0.9v (airflow from pin5 to pin1) 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 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??). 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 air velocity and ambient temperature measured below the module 22 (0.87?) note: wind tunnel test setup figure dimensions are in millimeters and (inches) figure 33: wind tunnel test setup
ds_ne12s03a_10032008 11 thermal curves (vertical) ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=12v vout=0.9v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection output current (a) ambient temperature ( ) 100lfm figure 37: output current vs. ambient temperature and air velocity @vin=12v, vout=0.9v (airflow from pin5 to pin1) ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=3.3v vout=2.5v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection output current (a) ambient temperature ( ) figure 38: output current vs. ambient temperature and air velocity@ vin =3.3v, vout=2.5v (airflow from pin5 to pin1) ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=5.0v vout=2.5v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection output current (a) ambient temperature ( ) figure 39: output current vs. ambient temperature and air velocity@ vin =5v, vout=2.5v (airflow from pin5 to pin1) ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=12v vout=2.5v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection output current (a) ambient temperature ( ) 100lfm 200lfm figure 40: output current vs. ambient temperature and air velocity @vin=12v, vout=2.5v (airflow from pin5 to pin1) ne12s0a0v03(standard) output current vs. ambient temperature and air velocity @vin=12v vout=5.0v (airflow from pin5 to pin1) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 25 30 35 40 45 50 55 60 65 70 75 80 85 output current (a) ambient temperature ( ) natural convection 100lfm 200lfm 400lfm 300lfm figure 41: output current vs. ambient temperature and air velocity@ vin =12v, vout=5.0v (a irflow from pin5 to pin1)
ds_ne12s03a_10032008 12 mechanical drawing vertical horizontal
ds_ne12s03a_10032008 13 part numbering system model list model name packaging input voltage output voltage output current efficiency 12vin 5vout@ 100% ld ne12s0a0v03pnfa vertical 3.1v~ 13. 8vdc 0.59v~ 5.0vdc 3a 92.5% NE12S0A0H03PNFA horizontal 3.1v~ 13.8vdc 0.59v~ 5.0vdc 3a 92.5% 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 . ne 12 s 0a0 v 03 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- 3.1~13.8v s- single output 0a0 - programmable h - horizontal v - vertical 03 - 03a p - positive n - 0.150? f- rohs 6/6 (lead free) a - 5 pins

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