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1 features ? high efficiency: 93.2% @ 12v/ 25a ? standard footprint: 58.4 x 61.0 x 11.2 mm (2.30? x2.40?x0.44?) ? industry standard pin out ? single board construction ? fixed frequency operation ? 2250v isolation ? basic insulation ? monotonic startup into normal and pre- bias loads ? fully protected: input uvlo, output ovp, ocp, otp ? no minimum load required ? wide output trim range: -20%, +10% ? iso 9001, tl 9000, iso 14001, qs 9000, 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 options ? positive on/off ? heatspreader available for extended operation applications ? telecom / datacom ? wireless networks ? optical network equipment ? server and data storage ? industrial / test equipment delphi series h48sa, half brick family dc/dc power modules: 48v in, 12v/25a out the delphi series h48sa half brick, 48v input, single output, isolated, open frame dc/dc converters are the latest offering from a world leader in power systems technology and manufacturing ? delta electronics, inc. this product fam ily provides up to 300 watts of power or up to 25a of output current in an industry standard footprint. this product represents the next generation of design technology required by today?s leading-edge circuitry. wi th creative design technology and optimization of component placem ent, these converters possess outstanding electrical and thermal pe rformance, as well as extremely high reliability under highly stressful operating conditions. typical efficiency of the 12v, 300w modul e is better than 93.2% and all modules are fully protected from abno rmal input/output voltage, current and temperature conditions. the delphi series converters meet all safety requirements with basic insulation. a variety of optional heatsinks are available for extended thermal operation. datasheet ds_h48sa12025_05112009
ds_h48sa12025_05112009 2 technical specifications (t a =25c, airflow rate=300 lfm, v in =48vdc, nominal vout unless otherwise noted.) parameter notes and conditions h48sa12025 (standard) min. typ. max. units absolute maximum ratings input voltage continuous 80 vdc transient (100ms) 100ms 100 vdc operating device temperature(openframe) please refer to fig24. for the measuring point -40 122 c operating device temperature(heatspreader) please refer to fig25. for the measuring point -40 109 c storage temperature -55 125 c input/output isolation voltage 2250 vdc input characteristics operating input voltage 36 48 75 vdc input under-voltage lockout turn-on voltage threshold 32.5 34 35.5 vdc turn-off voltage threshold 30.5 32 33.5 vdc lockout hysteresis voltage 1 2 3 vdc maximum input current vin=36v, 100% load 9.5 a no-load input current 170 240 ma off converter input current 18 ma inrush current(i 2 t) with 100uf external input cap 1 a 2 s input terminal ripple current rms, with 100uf/0.1ohm input cap, 100% load 0.42 a input reflected-ripple current pk-pk, thru 12h inductor, 5hz to 20mhz, 100% load 7 ma input voltage ripple rejection 120 hz 50 db output characteristics output voltage set point vin=48v, io=io.max, tc=25 11.82 12 12.18 vdc output voltage regulation over load io=io,min to io,max 10 mv over line vin=36v to 75v 10 mv over temperature tc=-40 to 100 120 mv total output voltage range over sample load, line and temperature 11.64 12.36 v output voltage ripple and noise 5hz to 20mhz bandwidth peak-to-peak 100% load, 1f ceramic, 10f tantalum 60 120 mv rms 100% load, 1f ceramic, 10f tantalum 30 60 mv operating output current range full input range 0 25 a operating output power range full input range 0 300 w output dc current protection full input range 110 150 % dynamic characteristics output voltage current transient 48v, 10f tan & 1f ceramic load cap, 0.1a/s positive step change in output current 50% io,max to 75% io,max 400 mv negative step change in output current 75% io,max to 50% io,max 400 mv settling time (within 1% vout nominal) 400 us turn-on transient start-up time, from on/off control 12 28 ms start-up time, from input 12 28 ms maximum output capacitance 100% resistor load; 5% overshoot of vout at startup 10000 f efficiency 100% load vin=48v 93.2 % 60% load vin=48v 92.5 % isolation characteristics input to output 2250 vdc isolation resistance 10 m ? isolation capacitance 1500 pf feature characteristics switching frequency 300 khz on/off control, negative remote on/off logic logic low (module on) von/off -2 1.2 v logic high (module off) von/off 3 18 v on/off control, positive remote on/off logic logic low (module off) von/off -2 1.2 v logic high (module on) von/off 3 18 v on/off current (for both remote on/off logic) ion/off at von/off=0.0v 0.3 ma on/off current (for both remote on/off logic) ion/off at von/off=3v 10 ua leakage current(for both remote on/off logic) logic high, von/off=15v 100 ua output voltage trim range pout <= max rated power 9.6 13.2 v output voltage remote sense range pout <= max rated power 10 % output over-voltage protection over full input range; over full temp range 115 140 % general specifications mtbf io=80% of io, max; ta=25c,airflow rate=300 lfm 1.5 m hours weight open frame 80 grams over-temperature shutdown(openframe) please refer to fig 24. for the measuring point 127 c over-temperature shutdown(heatspreader) please refer to fig 25. for the measuring point 116 c
ds_h48sa12025_05112009 electrical charact eristics curves 60 65 70 75 80 85 90 95 5 10152025 out put current (a) efficiency (%) 36vin 75vin 48vin 0 5 10 15 20 25 30 0 5 10 15 20 25 out put current (a) power dissipation (w) 36vin 48vin 75vin figure 1: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25c. vout=12v. figure 2: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25c. vout=12v. 60 65 70 75 80 85 90 95 5 10152025 out put current (a) efficiency (%) 36vin 75vin 48vin 0 5 10 15 20 25 30 0 5 10 15 20 25 out put current (a) power dissipation (w) 36vin 48vin 75vin figure 3: efficiency vs. load current for minimum, nominal, and maximum input voltage at 25c. vout=9.6v. figure 4: power dissipation vs. load current for minimum, nominal, and maximum input voltage at 25c. vout=9.6v. 3
ds_h48sa12025_05112009 4 electrical charact eristics curves 60 65 70 75 80 85 90 95 5 10152025 out put current (a) efficiency (%) 36vin 75vin 48vin 0 5 10 15 20 25 30 0 5 10 15 20 25 out put current (a) power dissipation (w) 36vin 48vin 75vin figure 5: efficiency vs. output voltage for minimum, nominal, and maximum input voltage at 25c, vout= 13 .2v. figure 6: power dissipation vs. out put voltage for minimum, nominal, and maximum input voltage at 25c, vout= 13 .2v. 0 2 4 6 8 10 12 30.0 31.3 33.6 35.0 40.0 45.0 50.0 55.0 60.0 65.0 70.0 75.0 output current (a) output voltage (v) figure 7: typical input characteristics at room temperature. figure 8: turn-on transient at full rated load current, 4ms/div: top trace: vout, 5v/div; bottom trace: on/off input, 5v/div. 0 0
ds_h48sa12025_05112009 5 electrical characteristics curves figure 9: turn-on transient at zero load current, 4 ms/div; top trace: vout, 5v/div; bottom trace: on/off input, 5v/div. figure 10: output voltage response to step-change in load current, 200mv/div, 200us/div. 75%-50%-75% of io, max, di/dt = 0.1 a /s. load cap: 10f, tantalum capacitor and 1f ceramic capacitor. 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.. vin+ vin- is ic 100uf, esr=0.2 ohm @ 25 o c 100khz cs: 220uf + + vin+ vin- is ic 100uf, esr=0.2 ohm @ 25 o c 100khz cs: 220uf + + + + figure 11: output voltage response to step-change in load current, 200mv/div, 1ms/div. 75% -50%-75% of io, max, di/dt = 1a/s. load cap: 5000f tantalum capacitor and 1f ceramic capacitor. 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.. figure 12: 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 (ltest) of 12 h. capacitor cs offset possible battery impedance. measured current as shown below. 0 0 0 0
ds_h48sa12025_05112009 electrical characteristics curves figure 13: input terminal ripple current, i c , at nominal input voltage and rated load current with 12h source impedance and 100f electrolytic capacitor, 500 ma/div, 2us/div. figure 14: input reflected ripple current, i s , through a 12h source inductor at nominal input voltage and rated load current, 20 ma/div, 2us/div. vo(-) vo(+) 10u 1u copper strip scope resistiv e load figure 15: output voltage noise and ripple measurement test setup figure 16: output voltage ripple at nominal input voltage and rated load current, 50mv/div, 2us/div. load capacitance: 1f 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. 0 2 4 6 8 10 12 0 5 10 15 20 25 30 35 output current (a) output voltage (v) figure 17: output voltage vs. load cu rrent showing typical current limit curves and converter shutdown points. 6 0 0 0
ds_h48sa12025_05112009 7 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 33 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. below is the reference design for an input filter tested with h48sa12025nn a to meet class b in cisspr 22. schematic and components list cx cy1 cy1 cx1 vin(+) vin(-) vo(+) vo(-) load h48sa12025 cin + - vin l1 l2 cy cx is 4.7uf ceramic cap; cx1 is 4.7uf ceramic cap; cy is 3.3nf ceramic cap; cy1 is 4.7nf ceramic cap; l1 is common-mode inductor, l1=0.08mh; l2 is common-mode inductor, l1=0.24mh; test result test result is in compliance with cispr 22 class b, which is shown as below: vin=48v, io=25a, yellow line is quasi peak mode; blue line is average mode. 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, can/csa-c22.2 no. 60950-00 and en60950:2000 and iec60950-1999, if the syst em in which the power module is to be used must meet safety agency requirements. when the i nput source is 60 vdc or below, 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 any hazardous voltages, including the ac mains, with reinforced insulation. ? one vi pin and one vo pin are grounded, or all the input and output pins are kept floating. ? the input terminals of the module are not operator accessible. ? if the metal baseplate is grounded the output must be also grounded. ? a selv reliability test is conducted on the system where the module is used to ensure that under a single fault, hazardous voltage does not appear at the module?s output. do not ground one of the input pins without grounding one of the output pins. this connection may allow a non-selv voltage to appear between the output pin and ground. the power module has extra-low voltage (elv) outputs when all input s 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 fuse with 30a 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 usua lly 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_h48sa12025_05112009 features descriptions over-current protection the modules include an inte rnal output over-current protection circuit. if the output current exceeds the ocp set point, the modules will automatically shut down, and enter hiccup mode or latch mode, which is optional. for hiccup mode, the module 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. hiccup mode is default mode. for latch mode, the module will latch off once it shutdown. the latch is reset by either cycling the input power or by toggling the on/off signal for one second. over-voltage protection the modules include an internal output over-voltage protection circuit. if the output voltage exceeds the ovp set point, the modules will automatically shut down, and enter hiccup mode or latch mode, which is optional. for hiccup mode, the module will try to restart after shutdown. if the over-voltage condition still exists, the module will shut down again. this restart trial will continue until the over-voltage condition is corrected. hiccup mode is default mode. for latch mode, the module will latch off once it shutdown. the latch is reset by either cycling the input power or by toggling the on/off signal for one second. over-temperature protection the over-temperatur e protection consists of circuitry that provides protection from thermal damage. if the temperature exceeds the ov er-temperature threshold the module will shut down, and enter in auto-restart mode or latch mode, which is optional. for auto-restart mode, the module will monitor the module temperature after shutdown. once the temperature is within the sp ecification, the module will be auto-restarted. auto-resta rt mode is default mode. for latch mode, the module will latch off once it shutdown. the latch is reset by either cycling the input power or by toggling the on/off signal for one second. 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. vo(+) vi(+) vo(-) sense(-) sense(+) vi(-) on/off trim r distribution resistor vo(+) vi(+) vo(-) sense(-) sense(+) vi(-) on/off trim r distribution resistor figure 18: remote on/off implementation remote sense remote sense compensates for voltage drops on the output by sensing the actual output voltage at the point of load. the voltage between the remote sense pins and the output terminals mu st not exceed the output voltage sense range given here: [vo(+) ? vo(?)] ? [sense(+) ? sense(?)] 10% vout this limit includes any increase in voltage due to remote sense compensation and output voltage set point adjustment (trim). vo(+) vi(+) vo(-) sense(-) sense(+) vi(-) on/off trim r distribution resistor vo(+) vi(+) vo(-) sense(-) sense(+) vi(-) on/off trim r distribution resistor figure 19: effective circuit configuration for remote sense operation if the remote sense feature is not used to regulate the output at the point of l oad, please connect sense(+) to vo(+) and sense(?) to vo(?) at the module. the output voltage can be increased by both the remote sense and the trim; however, the maximum increase is the larger of either the remote sense or the trim, not the sum of both. when using remote sense and trim, the output voltage of the module is usually increased, which increases the power output of the module with the same output current. care should be taken to ensure that the maximum output power does not exceed the maximum rated power. 8
ds_h48sa12025_05112009 9 figure 21: circuit configuration for tr im-down (decrease output voltage) if the external resistor is connected between the trim and sense (-) the output voltage set point decreases (fig. 21). the external resistor value required to obtain a percentage of output voltage change % is defined as: rtrim_down 100 2 ? ? ? ? ? ? ? k ex. when trim down to 9.6v from 12v = 100*(12-9.6)/12 = 20 rtrim_down = ) 2 20 100 ( ? k ? rtrim_down = 3 k ? the typical resistor value can be seen in below figure22. output voltage resistor value ( k ) 13.2v 95.8 12.6v 183.7 10.8v 8.0 9.6v 3.0 figure 22: trim resistor value example for popular output voltages the output voltage can be incr eased by both the remote sense and the trim, however the maximum increase is the larger of either the remote sense or the trim, not the sum of both. when using remote sense and trim, the output voltage of the module is usually increased, which increases the power output of the module wi th the same output current. care should be taken to ensure that the maximum output power of the module remains at or below the maximum rated power. features descriptions (con.) output voltage adjustment (trim) to increase or decrease the output voltage set point, the modules may be connected with an external resistor between the trim pin and either the sense(+) or sense(-). the trim pin should be left open if this feature is not used. figure 20: circuit configuration for trim-up (increase output voltage) if the external resistor is connected between the trim and sense (+) pins, the output voltage set point increases (fig. 20). the external resistor value required to obtain a percentage of output voltage change % is defined as: rtrim_up 12 1.225 2 ? ? ? ? ? ? ? 100 + () ? 100 + ? ? ? ? ? ? ? ? k ex. when trim up to 13.2v from 12v = 100*(13.2-12)/12 = 10 rtrim_up 12 1.225 2 ? ? ? ? ? ? ? 100 10 + () ? 100 + 10 ? ? ? ? ? ? ? ? k rtrim_up = 95.755 k ? i
ds_h48sa12025_05112009 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 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 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. the module?s maximum device temperature is to be defined and the measured location is illustrated in figure 24. to enhance syst em reliability, the power module should always be operated below the maximum operating temperature. if t he 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 ambient temperature measured below the module figure 23: wind tunnel test setup 10
ds_h48sa12025_05112009 thermal curves h48sa12025(standard) output current vs. ambient temperature and air velocity @vin = 48v (either orientation) 0 5 10 15 20 25 25 30 35 40 45 50 55 60 65 70 75 80 85 natural convection 100lfm 300lfm 200lfm ambient temperature ( figure 24: temperature measurement location for openframe version - the allowed maximum hot spot temperature is defined at 122 . figure 26: output current vs. ambient temperature and air velocity @ v in =48v, vout=12v(openframe version, either orientation). h48sa12025(standard) output current vs. ambient temperature and air velocity @vin = 48v (either orientation,with heatspreader) 0 5 10 15 20 25 25 30 35 40 45 50 55 60 65 70 75 80 85 ambient temperature ( figure 25: temperature measurement location for heatspreader version - the allowed maximum hot spot temperature is defined at 109 . figure 27: output current vs. ambient temperature and air velocity @ v in =48v, vout=12v(heatspreader version, either orientation). 11
ds_h48sa12025_05112009 12 mechanical drawing (w ithout heatspreader) pin no. name function 1 2 3 4 5 6 7 8 9 +vin on/off case -vin -vout -sense trim +sense +vout positive input voltage remote on/off case pin negative input voltage negative output voltage negative remote sense output voltage trim positive remote sense positive output voltage notes: 1 2 3 pins 1-4, 6-8 are 1.00mm (0.040?) diameter pins 5 and 9 are 2.00mm (0.079?) diameter all pins are copper with tin plating.
ds_h48sa12025_05112009 mechanical drawing (with heatspreader) for modules with optional heatspreader, they are intended for wave soldering assembly onto system boards, please do not subject modules with optional heatspreader through reflow temperature profile. 13
ds_h48sa12025_05112009 14 part numbering system h 48 s a 120 25 n n f a form factor input voltage number of outputs product series output voltage output current on/off logic pin length option code h - half- brick 48v s- single a - advanced 120- 12v 25- 25a n - negative p - positive n - 0.145? f- rohs 6/6 (lead free) a - standard functions h - with heatspreader model list part number input output eff @ 100% load H48SA12025NNFA 36v~75v 11a 12v 25a 93.2% * 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 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 believ ed to be accurate and reliable. however, no responsibility is as sumed by delta for its use, nor for any infringements of patent s or other rights of third parties, which may result from its use. no license is granted by implication or otherwise unde r any patent or patent rights of delta. de lta reserves the right to revise these specifications at any time, without notice .

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