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features high efficiency: 91% @ 12vin, 5v/6a out size: 30.5x15.5x11.7mm (1.20?0.61?0.46?) -- vertical 30.5x15.5x12.3mm (1.20?0.61?0.48?) -- horizontal voltage and resistor-based trim no minimum load required output voltage programmable from 0.9vdc to 5.0vdc via external resistors fixed frequency operation input uvlo, output, ocp, scp power good output signal remote on/off iso 9001, tl 9000, iso 14001, qs9000, ohsas 18001 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 delphi nc06 series non-isolated point of load dc/dc power modules: 12vin, 0.9v~5.0vout, 6a the delphi nc06 series, 12v input, single output, non-isolated point of load dc/dc converters are the latest offering from a world leader in power systems technology and manufacturing D delta electronics, inc. the nc06 series operates from a 12v nominal input, provides up to 6a of power in a vertical or horizontal mounted through-hole package and the output can be resistor- or voltage-trimmed from 0.9vdc to 5.0vdc. it provides a very cost effective point of load solution. with creative design technology and optimization of comp onent placement, these converters possess outstanding electrical and thermal performance, as well as extremely high reliability under high ly stressful operating conditions. datasheet ds_nc12s06a_01102008 datacom distributed power architectures servers and workstations lan / wan applications data processing applications options vertical or horizontal versions
ds_nc12s06a_01102008 2 technical specifications (ambient temperature=25c, minimum airflow=200lfm, nominal v in =12vdc unless otherwise specified.) parameter notes and conditions nc12s0a0v/h06 min. typ. max. units absolute maximum ratings input voltage 14 vdc operating temperature (vertical) with appropriate air flow and derating, see figs 33 0 130 c operating temperature (horizontal) with appropriate air flow and derating, see figs 39 0 125 c storage temperature -40 125 c input/output isolation voltage non-isolated na v input characteristics operating input voltage 10.2 12.0 13.8 v input under-voltage lockout turn-on voltage threshold 9.4 v turn-off voltage threshold 8.1 v lockout hysteresis voltage 1.3 v maximum input current 100% load, 10.2vin, 5.0vout 3.27 a no-load input current vin=12v, vout=5v 56 ma off converter input current remote off 14 ma input reflected-ripple current refer to figure 31. 60 ma input ripple rejection 120hz 60 db output characteristics output voltage adjustment range 0.9 5.0 v output voltage set point with a 1.0% trim resistor -3 +3 % output voltage regulation over load io=io_min to io_max -1.0 +1.0 % over line vin=vin_min to vin_max -0.2 +0.2 % output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak full load, 100nf ceramic, 10f tantalum 0.9v-2.5v 3.3v-5.0v 40 50 mv rms full load, 100nf ceramic, 10f tantalum 20 mv output current range 0 6 a output voltage over-shoot at start-up vin=12v, turn on 1 % output voltage under-shoot at power-off vin=12v, turn off 100 mv output dc current-limit inception hiccup mode 7 a output short-circuit current hiccup mode dynamic characteristics output dynamic load response 12vin, 100nf ceramic, 10f tantalum load cap, 10a/s positive step change in output current 50% io_max to 75% io_max 75 mv negative step change in output current 75% io_max to 50% io_max 75 mv settling time settling to be within regulation band (vo +/- 2.5%) 200 s turn-on transient start-up time, from on/off control from enable high to 10% of vo 10 ms start-up time, from input power from vin=12v to 10% of vo 10 ms minimum output capacitance ex: oscon 6.3v/680f (esr 13 m ? max.) 680 f maximum output startup capacive load full load tbd f minimum input capacitance ex: oscon 16v/270f (esr 18 m ? max.) 270 f efficiency vo=0.9v vin=12v, io=6a 71 % vo=1.2v vin=12v, io=6a 76 % vo=1.5v vin=12v, io=6a 79 vo=1.8v vin=12v, io=6a 81 % vo=2.5v vin=12v, io=6a 85 % vo=3.3v vin=12v, io=6a 88 % vo=5.0v vin=12v, io=6a 91 % feature characteristics switching frequency fixed 300 khz on/off control positive logic (internally pulled high) logic high module on (or leave the pin open) 2.4 5.5 v logic low module off 0 0.8 v general specifications mtbf telcordia sr-332 issue1 method1 case3 at 50c 1.7 m hours weight 7.1 grams
ds_nc12s06a_01102008 3 electrical characteristics curves 0 10 20 30 40 50 60 70 80 90 0.01.02.03.04.05.06.0 output current (a) efficiency (%) 10.2 12 13.8 0 10 20 30 40 50 60 70 80 90 0.0 1.0 2.0 3.0 4.0 5.0 6.0 output current (a) efficiency (%) 10.2 12 13.8 figure 1: converter efficiency vs. output current figure 2: converter efficiency vs. output current (0.9v output voltage) (1.2v output voltage) 0 10 20 30 40 50 60 70 80 90 0.01.02.03.04.05.06.0 output current (a) efficiency (%) 10.2 12 13.8 0 20 40 60 80 100 0.01.02.03.04.05.06.0 output current (a) efficiency (%) 10.2 12 13.8 figure 3: converter efficiency vs. output current (1.8v output voltage) figure 4: converter efficiency vs. output current (2.5v output voltage) 0 20 40 60 80 100 0.0 1.0 2.0 3.0 4.0 5.0 6.0 output current (a) efficiency (%) 10.2 12 13.8 0 10 20 30 40 50 60 70 80 90 100 0.0 1.0 2.0 3.0 4.0 5.0 6.0 output current (a) efficiency (%) 10.2 12 13.8 figure 5: converter efficiency vs. output current (3.3v output voltage) figure 6: converter efficiency vs. output current (5.0v output voltage)
ds_nc12s06a_01102008 4 electrical characteristics curves (con.) figure 7: output ripple & noise at 12vin, 0.9v/6a out figure 8: output ripple & noise at 12vin, 1.2v/6a out figure 9: output ripple & noise at 12vin, 1.8v/6a out figure 10: output ripple & noise at 12vin, 2.5v/6a out figure 11: output ripple & noise at 12vin, 3.3v/6a out figure 12: output ripple & noise at 12vin, 5.0v/6a out
ds_nc12s06a_01102008 5 electrical characteristics curves (con.) figure 13: turn on delay time at 12vin, 0.9v/6a out ch2: vin ch3: vout ch4: pwrgd figure 14: turn on delay time remote on/off, 0.9v/6a out ch2: enable ch3: vout ch4: pwrgd figure 15: turn on delay time at 12vin, 2.5v/6a out ch2: vin ch3: vout ch4: pwrgd figure 16: turn on delay time at remote on/off, 2.5v/6a out ch2: enable ch3: vout ch4: pwrgd figure 17: turn on delay time at 12vin, 5.0v/6a out ch2: vin ch3: vout ch4: pwrgd figure 18: turn on delay time at remote on/off, 5.0v/6a out ch2: enable ch3: vout ch4: pwrgd
ds_nc12s06a_01102008 6 electrical characteristics curves (con.) figure 19: typical transient response to step load change at 10a/ figure 20: typical transient response to step load change at 10a/ figure 21: typical transient response to step load change at 10a/ figure 22: typical transient response to step load change at 10a/
ds_nc12s06a_01102008 7 features descriptions design considerations enable (on/off) the nc06 is a single phase and voltage mode controlled buck topology. block diagram of the converter is shown in figure 23. the output can be trimmed in the range o f 0.9vdc to 5.0vdc by a resistor from trim pin to ground. the enable (on/off) input allows external circuitry to pu t the nc converter into a low power dissipation (sleep) mode. positive (active-high) enable is available as standard. the converter can be turned on/off by remote control. positive on/off (enable pin) logic implies that the converter dc output is enabled when this signal is driven high (greater than 2.4v) or floating and disabled when the signal is driven low (below 0.8v). negative on/off logic is optional and could also be ordered. positive enable (active-high) units of the nc series are turned on if the enable pin is high or floating. pulling the pin low will turn off the unit. with the active high function, the output is guaranteed to turn on if the enable pin is driven above 2.4v. the output will turn off if the enable pin voltage is pulled below .8v. the converter provides an open collector signal called power good. the power good signal is pulled low when output is not within 10% of vout or enable is off. the enable input can be driven in a variety of ways as shown in figures 24, 25 and 26. if the enable signal comes from the primary side of the circuit, the enable can be driven through either a bipolar signal transisto r (figure 24) or a logic gate (figure 25). if the enable signal comes from the secondary side, then an opto-coupler o r other isolation devices must be used to bring the signal across the voltage isolation (please see figure 26). 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. nc6a/15a/20a vout ground trim enable ground vin figure 24: enable input drive circuit for nc series figure 23: block diagram nc6a/15a/20a vout ground trim enable ground vin 5v safety considerations it is recommended that the user to provide a ver y 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. figure 25: enable input drive circuit using logic gate. nc6a/15a/20a vout ground trim enable ground vin figure 26 : enable input drive circuit example with isolation.
8 the nc06/nc15/nc20 module has a trim range of 0.9v to 5.0v. the trim resistor equation for the nc6a/nc15a/ nc20a is : features descriptions (con.) input under-voltage lockout 9.0 1170 )( ? = vout rs the input under-voltage lockout prevents the converte r from being damaged while operating when the inpu t voltage is too low. the lockout occurs between 7.6v to 8.6v. vout is the output voltage setpoint rs is the resistance between trim and ground rs values should not be less than 280 ? over-current and short-circuit protection output voltage rs ( ? ) the nc series modules have non-latching over-curren t and short-circuit protection circuitry. when over curren t condition occurs, the module goes into the non-latching hiccup mode. when the over-current condition is removed, the module will resume normal operation. open +0.9 v 3.92k +1.2 v +1.5 v 1.96k +1.8 v 1.3k +2.5 v 732 a n over current condition is detected by measuring the voltage drop across the high-side mosfet. 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. please see the electrical characteristics for details of the ocp function. +3.3 v 487 287 +5.0 v figure 28: typical trim resistor values nc6a/15a/20a vout ground trim enable ground vin 1.3k rt rs vt the detection of the rds(on) of the high side mosfe t also acts as an over temperature protection since high temperature will cause the rds(on) of the mosfet to increase, eventually triggering over-current protection. over voltage protection (ovp) figure 29: output voltage trim with voltage source the converter will shut down when an over voltage protection is detected. once the ovp condition is detected, controller will stop all pwm outputs and turn on low-side mosfet to prevent any damage to load. to use voltage trim, the trim equation for the nc6a/nc15a/ nc20a is (please refer to fig. 29) : )9.0(17.1 )17.13.1( )( ?? ? = voutrs vtrs krt output voltage programming the output voltage of the nc series is trimmable by connecting an external resistor between the trim pin and vout is the desired output voltage output ground as shown figure 27 and the typical trim vt is the external trim voltage resistor values are shown in figure 28. the output can also be set by an external voltage connected to trim pin as shown in figure 29. rs is the resistance between trim and ground (in k ? ) rt is the resistor to be defined with the trim voltage (in k ? ) below is an example about using this voltage trim equation : nc6a/15a/20a rs vout ground trim enable ground vin example if vt = 1.25v, desired vout = 2.5v and rs = 0.715k ? ds_nc12s06a_01102008 figure 27: trimming output voltage = ?? ? = k voutrs vtrs krt 51.12 )9.0(17.1 )17.13.1( )(
ds_nc12s06a_01102008 9 features descriptions (con.) output capacitance power good there is no output capacitor on the nc series modules. hence, an external output capacitor is required for stable operation. for nc15 modules, a n external 6.3v/680 f low esr capacitor (for example, oscon) is required fo r stable operation. the converter provides an open collector signal called power good. this output pin uses positive logic and is open collector. this power good output is able to sink 5ma and set high when the output is within 10% o f output set point. it is important to places these low esr capacitors as close to the load as possible in order to get improved dynamic response and better voltage regulation, especially when the load current is large. several of these low esr capacitors could be used together to furthe r lower the esr. the power good signal is pulled low when output is not within 10% of vout or enable is off. current sink capability the nc series converters are able to sink current as well as function as a current source . it is able to sink the full output current at any output voltage up to and including 2.5v. this feature allows the nc series fit into any voltage termination application. please refer to individual datasheet for the maximum allowed start-up load capacitance for each nc series as i t is varied between series. reflected ripple current and output ripple and noise measurement voltage margining adjustment the measurement set-up outlined in figure 31 has been used for both input reflected/ terminal ripple current and output voltage ripple and noise measurements on nc series converters. output voltage margin adjusting can be implemented in the nc 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 lowe r by connecting a resistor, r margin-down , from the trim pin to the voltage source vt. figure 30 shows the circuit configuration for output voltage margining adjustment. nc6a/15a/20a vout ground trim enable ground vin rmargin-dow n rs vt rmargin-up cs=270 f*1, ltest=1.4 h, cin=270 f*1, cout=680 f *1 figure 31: input reflected ripple/ capacitor ripple current and output voltage ripple and noise measurement setup for nc06 figure 30: circuit configuration for output voltage margining paralleling nc06/nc15/nc20 converters do not have built-in curren t sharing (paralleling) ability. hence, paralleling of multiple nc06/nc15/nc20 converters is not recommended.
ds_nc12s06a_01102008 10 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 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.
ds_nc12s06a_01102008 11 thermal curves (nc12s0a0v06) 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) nc12s0a0v06 (standard) output current vs. ambient temperature and air velocity @ vout = 3.3v (either orientation) 0 1 2 3 4 5 6 7 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm 300lfm 400lfm figure 35: output current vs. ambient temperature and air velocity@ vout=3.3v(either orientation) figure 32: wind tunnel test setup nc12s0a0v06 (standard) output current vs. ambient temperature and air velocity @ vout = 1.8v (either orientation) 0 1 2 3 4 5 6 7 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm 300lfm figure 36: output current vs. ambi ent temperature and air velocity@ vout=1.8v(either orientation) figure 33: temperature measurement location * the allowed maximum hot spot temperature is defined at 130 nc12s0a0v06 (standard) output current vs. ambient temperature and air velocity @ vout = 5v (either orientation) 0 1 2 3 4 5 6 7 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm 300lfm 400lfm 500lfm nc12s0a0v06 (standard) output current vs. ambient temperature and air velocity @ vout =0.9v (either orientation) 0 1 2 3 4 5 6 7 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm figure 37: output current vs. ambi ent temperature and air velocity@ vout=0.9v(either orientation) figure 34: output current vs. ambi ent temperature and air velocity @vout=5v(either orientation)
ds_nc12s06a_01102008 12 thermal curves (nc12s0a0h06) 18 (0.71?) module a ir flow 9 (0.35?) 50.8 (2.0?) facing pwb pwb air velocity and ambient temperature measured below the module note: wind tunnel test setup figure dimensions are in millimeters and (inches) nc12s0a0h06 (standard) output current vs. ambient temperature and air velocity @ vout = 3.3v (either orientation) 0 1 2 3 4 5 6 7 40 45 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm 300lfm 400lfm figure 41: output current vs. ambient temperature and air velocity@ vout=3.3v(either orientation) figure 38: wind tunnel test setup nc12s0a0h06 (standard) output current vs. ambient temperature and air velocity @ vout = 1.8v (either orientation) 0 1 2 3 4 5 6 7 40 45 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm 300lfm figure 39: temperature measurement location figure 42: output current vs. ambi ent temperature and air velocity@ vout=1.8v(either orientation) * the allowed maximum hot spot temperature is defined at 125 nc12s0a0h06 (standard) output current vs. ambient temperature and air velocity @ vout = 5v (either orientation) 0 1 2 3 4 5 6 7 40 45 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm 300lfm 400lfm 500lfm nc12s0a0h06 (standard) output current vs. ambient temperature and air velocity @ vout = 0.9v (either orientation) 0 1 2 3 4 5 6 7 40 45 50 55 60 65 70 75 80 85 ambient temperature ( ) output current(a) natural convection 100lfm 200lfm figure 40: output current vs. ambi ent temperature and air velocity @vout=5v(either orientation) figure 43: output current vs. ambi ent temperature and air velocity@ vout=0.9v(either orientation)
ds_nc12s06a_01102008 13 mechanical drawing horizontal vertical
ds_nc12s06a_01102008 14 part numbering system model list model name packaging input voltage output voltage output current efficiency 12vin @ 100% load nc12s0a0v06pnfa vertical 10.2 ~ 13.8vdc 0.9 v ~ 5.0vdc 6a 91% (5.0v) nc12s0a0h06pnfa horizontal 10.2 ~ 13.8vdc 0.9 v ~ 5.0vdc 6a 91% (5.0v) 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 . nc 12 s 0a0 v 06 p n f a input voltage number of outputs output voltage mounting output current on/off logic pin length product series option code nc- non-isolated converter 12- 10.2~13.8v s- single output 0a0 - programmable h- horizontal v- vertical 06- 6a p- positive n- negative n- 0.14? r- 0.118? f- rohs 6/6 (lead free) a- standard function

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