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mcd10127 rev. 1.1, 09-jun-10 page 1 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output applications ? telecommunications ? data communications ? wireless communications ? servers, workstations benefits ? cost-effective, single board design with optional attached baseplate for cold plate cooling applications and enhanced power capability. ? high efficiency ? no heat sink required features ? rohs lead-free solder and lead-solder-exempted products are available ? delivers up to 25 a of output (13.5 a @ 70 c, 200 lfm) ? industry-standard half-brick pinout ? optional baseplate attachment ? on-board input differential lc-filter ? startup into pre-biased load ? no minimum load required ? dimensions: 2.40? x 2.28? x 0.50? (61.0 mm x 57.9 mm x 12.7 mm) ? meets basic insulation requirements of en60950 ? withstands 100 v input transient for 100 ms ? fixed frequency operation ? remote output voltage sense ? fully protected with automatic recovery ? positive or negative logic on/off option ? output voltage trim range: +10%/ ? 20% with industry-standard trim equations ? high reliability: mtbf approx. 8.7 million hours, calculated per telcordia tr-332, method i case 1 ? recognized to ul60950-1/csa 22.2 no. 60950-1, and tuv approved to iec_en60950-1 ? designed to meet class b conducted emissions per fcc and en55022 when used with external filter ? all materials meet ul94, v-0 flammability rating description the HBC48T25120 power module is an open frame half-brick dc-dc converter providing a regulated and isolated output voltage of 12.0 vdc with an output current up to 25 a suitable for today?s distributed power architecture applications. it offers outstanding thermal performance in high temperature environments. this performance is accomplished through the use of patented/patent-pending circuits, packaging, and processing techniques to achieve ultra-high efficiency, excell ent thermal management, and a low mechanical profile. this low-body profile minimizes impedance to system ai rflow, thereby enhancing coo ling for both upstream and downstream devices. for extended cooling purposes, a baseplate option is avail able. attaching a heat sink or cold plate further enhances the unit?s capability. the use of 100% automation for assembly, coupled with advanced electronic circuits and thermal design, results in a product with extremely high reliability. operating from a 36-75 v input, the HBC48T25120 converte r provides an output that can be trimmed from ?20% to +10% of the nominal output voltage, t hereby providing outstanding design flexibility. .
mcd10127 rev. 1.1, 09-jun-10 page 2 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output electrical specifications conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vi n = 48 vdc, unless otherwise specified. parameter notes min typ max units absolute maximum ratings input voltage continuous transient (100 msec) 0 75 100 vdc vdc operating ambient temperature -40 85 c operating temperature component (tc) baseplate (tb) -40 -40 125 110 c c storage temperature -55 125 c isolation characteristics input to output isolation 1500 vdc input to case isolation 1500 vdc output to case isolation 1500 vdc isolation capacitance 2.5 f isolation resistance 10 m ? feature characteristics switching frequency 360 khz output voltage trim range 1 industry-std. equations -20 +10 % remote sense compensation 1 percent of v out ( nom ) +10 % output overvoltage protecti on latching 117 122 127 % overtemperature shutdown component (tc) baseplate (tb) non-latching 140 125 c c auto-restart period applies to all protection features 200 ms turn-on time from vin time from uvlo to vo=90%vo-nom 50 ms turn-on time from enable time from enable to vo=90%vo-nom 4 ms on/off control (positive logic) converter off (logic low) -20 0.8 vdc converter on (logic high) 2.4 20 vdc on/off control (negative logic) converter off (logic hi gh) 2.4 20 vdc converter on (logic low) -20 0.8 vdc
mcd10127 rev. 1.1, 09-jun-10 page 3 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output electrical specifications (continued) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, unless otherwise specified. parameter notes min typ max units input characteristics operating input voltage range 36 48 75 vdc input under voltage lockout non-latching turn-on threshold 33 34 35 vdc turn-off threshold 31 32 33 vdc input voltage transient 100 ms 100 vdc maximum input current 12 vdc out @ 25 adc, vin= 36 vdc 10 adc input stand-by current vin = 48 v, converter disabled 3 madc input no load current (0 load on the output) vin = 48 v, converter enabled 75 madc input reflected-ripple current 25 mhz bandwidth 20 ma pk-pk input voltage ripple rejection 120 hz 65 db output characteristics output voltage set point (no load) 11.88 12.00 12.12 vdc output regulation over line 4 10 mv over load 4 10 mv output voltage range over line, load and temperature 2 11.76 12.24 vdc output ripple and noise ? 25 mhz bandwidth full load, co = 10 f (tant.) + 1 f (cer.) 75 200 mv pk-pk external load capacitance plus full load (resistive) 15,000 f output current range 0 25 adc current limit inception non-latching 27.5 30 33.5 adc peak short-circuit current non-latching, short = 10 m ? 28 a rms short-circuit current non-latching 5 a rms dynamic response load change 50%-75%-50%, di/dt = 0.1 a/s co = 1 f (ceramic) 50 mv di/dt = 1 a/s co = 15,000 f (oscon) 120 mv settling time to 1% 30 s efficiency 100% load 93 % 50% load 95 % additional notes: . 1 vout can be increased up to 10% via the sense leads or up to 10% via the trim function. however, the total output voltage trim -up should not exceed 10% of v out ( nom ). 2 operating ambient temperature range of -40 oc to 85 oc for converter.
mcd10127 rev. 1.1, 09-jun-10 page 4 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output operations input and output impedance these power converters have been designed to be stable with no external capacitors when used in low inductance input and output circuits. in many applications, the inductance associated with the distribution from the power source to the input of the converter can affect the stability of the converter. the addition of a 100 f electrolytic capacitor with an esr < 1 ? across the input helps to ensure stability of the conv erter. in many applications, the user has to use decoupling capacitance at the load. the power converter will exhi bit stable operation with external load capacitance up to 15,000 f on the output. additionally, see the emc section of this data sheet for discussion of other external components which may be required for control of conducted emissions. on/off (pin 2) the on/off pin is used to turn the power converter on or off remotely via a system signal. there are two remote control options available, positive and negative logic, with both referenced to vin(-). a typical connection is shown in fig. a. vin (+) on/off vin (-) vout (+) sense (+) sense (-) vout (-) rload vin control input (top view) case trim fig. a: circuit configuration for on/off function. the positive logic version turns on when the on/off pin is at a logic high and turns off when at a logic low. the converter is on when the on/off pin is left open. see the electrical specifications for logic high/low definitions. the negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. the on/off pin can be hardwired directly to vin(-) to enable automatic power up of the converter without the need of an external control signal. the on/off pin is internally pulled up to 5 vdc through a resistor. a properly de-bounced mechanical switch, open-collector transistor, or fet can be used to drive the input of the on/off pin. the device must be capable of sinking up to 0.2 ma at a low level voltage of ? 0.8 v. an external voltage source (20 v maximum) may be connected directly to the on/off input, in which case it must be capable of sourcing or sinking up to 1 ma depending on the signal polarity. see the startup information section for system timing waveforms associated with use of the on/off pin. remote sense (pins 6 and 8) the remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter and the load. the sense(-) (pin 6) and sense(+) (pin 8) pins should be connected at the load or at the point where regulation is required (see fig. b). vin (+) on/off vin (-) vout (+) sense (+) sense (-) vout (-) rload vin (top view) case trim rw rw fig. b: remote sense circuit configuration. caution if remote sensing is not utilized, the sense(-) pin must be connected to the vout(-) pin (pin 5), and the sense(+) pin must be connected to the vout(+) pin (p in 9) to ensure the converter will regulate at the specified out put voltage. if these connections are not made, the converter will deliver an output voltage that is slightly higher than the s pecified data sheet value. because the sense leads carry minimal current, large traces on the end-user board are not required. however, sense traces s hould be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance. the converter?s output overvoltage protection (ovp) circuitry senses the voltage across vout(+) and vout(-), and not across the +/- sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load should be minimized to prevent unwanted triggering of the ovp. when utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability of the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given conditions.
mcd10127 rev. 1.1, 09-jun-10 page 5 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output when using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating in order to maintain the required voltage across the load. therefore, the designer must, if necessary, decrease the maximum current (originally obtained from the derating curves) by the same percentage to ensure the converter?s actual output power remains at or below the maximum allowable output power. output voltage adjust /trim (pin 7) the output voltage can be adjusted up 10% or down 20% relative to the rated output voltage by the addition of an externally connected resistor. (trim up to 10% at full load is guaranteed at vin 40v.) the trim pin should be left open if trimming is not being used. to minimize noise pickup, a 0.1 f capacitor is connected internally between the trim and sense(-) pin. to increase the output voltage, refer to fig. c. a trim resistor, r t-incr , should be connected between the trim (pin 7) and sense(+) (pin 8), with a value of: [k ? ] where, ? ? incr t r required value of trim-up resistor [k ? ] ? ? nom o v nominal value of output voltage [v] 100 x v ) v (v nom - o nom - o req - o ? ? [%] ? ? req o v desired (trimmed) output voltage [v]. when trimming up, care must be taken not to exceed the converter?s maximum allowable output power. see the previous section for a complete discussion of this requirement. vin (+) on/off vin (-) vout (+) sense (+) sense (-) vout (-) rload vin (top view) case trim r t-incr fig. c: configuration for increasing output voltage. to decrease the output voltage (fig. d), a trim resistor, r t-decr , should be connected between the trim (pin 7) and sense(-) (pin 6), with a value of: 2 | | 100 r decr t ? ? ? [k ? ] where, ? ? decr t r required value of trim-down resistor [k ? ] and note: the above equations for calculation of trim resistor values match those typically used in conventi onal industry-standard half-bricks. vin (+) on/off vin (-) vout (+) sense (+) sense (-) vout (-) rload vin (top view) case trim r t-decr fig. d: configuration for decreasing output voltage . trimming/sensing beyond 110% of the rated output voltage is not an acceptable design practice, as this condition could cause unwanted triggering of the output overvoltage protection (ovp) circuit. the designer should ensure that the difference between the voltages across the converter?s output pins and its sense pins does not exceed 110% of v out ( nom ), or: x nom - o sense sense out out 10% v )] ( v ) ( [v )] ( v ) ( [v ? ? ? ? ? ? ? ? [v] this equation is applicable for any condition of output sensing and/or output trim. ) 2 (100 1.225 ) (100 v r nom o incr t ? ? ? ? ? ?
mcd10127 rev. 1.1, 09-jun-10 page 6 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output protection features input undervoltage lockout (uvlo) input undervoltage lockout is standard with this converter. the converter will shut down when the input voltage drops below a pre-determined voltage. the input voltage must be typically 34 v for the converter to turn on. on ce the converter has been turned on, it will shut off when the input voltage drops typically below 32 v. this feature is beneficial in preventing deep discharging of batteries used in telecom applications. output overcurrent protection (ocp) the converter is protected against overcurrent or short circuit conditions. upon sensing an overcurrent condition, the converter will switch to constant current operation and thereby begin to reduce output voltage. when the output voltage drops below 60% of the nominal value of output voltage, the converter will shut down. once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3-5% duty cycle. the attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 60% of its nominal value. once the output current is brought back into its specified range, the conver ter automatically exits the hiccup mode and continues normal operation. output overvoltage protection (ovp) the converter will shut down if the output voltage across vout(+) (pin 9) and vout(-) (pin 5) exceeds the threshold of the ovp circuitry. the ovp circuitry contains its own reference voltage, independent of the output voltage regulation loop. once the converter has shut down, it will latch off. the latch can be reset by toggling the enable pin off then on or by recycling the input voltage. overtemperature protection (otp) the converter will shut down under an overtemperature condition to protect itself from overheating caused by opera tion outside the thermal derating curves, or operation in abnormal conditions such as system fan failure. after the converter has cooled to a safe operating temperature, it will automatically restart. safety requirements the converters meet north american and international safety regulatory requirements per ul60950-1 and en60950-1. basic insulation is provided between input and output. to comply with safety agencies? requirements, an input line fuse must be used external to the converter. a 15 amp fuse is recommended for use with this product. the HBC48T25120 converter is ul approved for a maximum fuse rating of 15 amps. to protect a group of converters with a single fuse, the rating can be increased from the recommended value above.
mcd10127 rev. 1.1, 09-jun-10 page 7 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output startup information (using negative on/off) scenario #1: initial startup from bulk supply on/off function enabled, conver ter started via application of v in . see figure e. time comments t 0 on/off pin is on; system front end power is toggled on, v in to converter begins to rise. t 1 v in crosses undervoltage lockout protection circuit threshold; converter enabled. t 2 converter begins to respond to turn-on command (after 50ms turn-on delay). t 3 converter v out reaches 100% of nominal value. for this example, the total converter startup time (t 3 - t 1 ) is typically 54 ms . scenario #2: initial startup using on/off pin with v in previously powered, converter started via on/off pin. see figure f. time comments t 0 v input at nominal value. t 1 arbitrary time when on/off pin is enabled (converter enabled). t 2 end of converter turn-on delay. t 3 converter v out reaches 100% of nominal value. for this example, the total converter startup time (t 3 - t 1 ) is typically 4 ms . scenario #3: turn-off and restart using on/off pin with v in previously powered, converter is disabled and then enabled via on/off pin. see figure g. time comments t 0 v in and v out are at nominal values; on/off pin on. t 1 on/off pin arbitrarily disabled; converter output falls to zero; turn-on inhibit delay period (200 ms typical) is initiated, and on/off pin action is internally inhibited. t 2 on/off pin is externally re-enabled. if (t 2 - t 1 ) 200 ms , external action of on/off pin is locked out by startup inhibit timer. if (t 2 - t 1 ) > 200 ms , on/off pin action is internally enabled. t 3 turn-on inhibit delay period ends. if on/off pin is on, converter begins turn-on; if off, converter awaits on/off pin on signal; see figure f. t 4 end of converter turn-on delay. t 5 converter v out reaches 100% of nominal value. for the condition, (t 2 - t 1 ) 200 ms , the total converter startup time (t 5 - t 2 ) is typically 204 ms . for (t 2 - t 1 ) > 200 ms , startup will be typically 4 ms after release of on/off pin. fig. e: startup scenario #1. fig. f: startup scenario #2. fig. g: startup scenario #3.
mcd10127 rev. 1.1, 09-jun-10 page 8 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output characterization general information the converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for horizontal mountings, efficiency, startup and shutdown parameters, output ripple and noise, transient response to load step- change, overload, and short circuit. the following pages contain specific plots or waveforms associated with the converter. additional comments for specific data are provided below. test conditions all data presented were taken with the converter soldered to a test board, specifically a 0.060? thick printed wiring board (pwb) with four layers. the top and bottom layers were not metalized. the two inner layers, comprised of two-ounce copper, were used to provide traces for connect ivity to the converter. the lack of metallization on the outer layers as well as the limited thermal connection ensured that heat transfer from the converter to the pwb was minimized. this provides a worst-case but consistent scenario for thermal derating purposes. all measurements requiring airflow were made in the vertical and horizontal wind tunnel using infrared (ir) thermography and thermocouples for thermometry. ensuring components on the converter do not exceed their ratings is important to maintaining high reliability. if one anticipates operating the converter at or close to the maximum loads specified in the derating curves, it is prudent to check actual derating temperatures in the application. thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. the use of awg #40 thermocouples is recommended to ensure measurement accuracy. careful routing of the thermocouple leads will further minimize measurement error. refer to fig. h and fig. i for the optimum thermocouple locations. thermal derating load current vs. ambient temperature and airflow rates are given in fig. 1 and fig. 2 for horizontal converter mountings, with and without baseplate option. ambient temperature was varied between 25 c and 85 c, with airflow rates from 30 to 400 lfm (0.15 to 2.0 m/s). for each set of conditions, the maximum load current was defined as the lowest of: (i) the output current at which any fet junction temperature does not exceed a maximum specified temperature of 125 c as indicated by a thermocouple measurement, or (ii) the output current at which the base plate temperature does not exceed a maximum specified temperature of 110 c as indicated by thermocouple measure, or (iii) the nominal rating of the converter (25 a). during normal operation, derating curves with maximum fet temperature less or equal to 125 c should not be exceeded. temperature at the thermocouple location shown in fig. h and i should not exceed 125 c and 110c respectively in order to operate inside the derating curves. efficiency fig. 3 shows the efficiency vs. load current plot for an ambient temperature of 25 oc, airflow rate of 300 lfm (1.5 m/s) with horizontal mounting and input voltages of 36 v, 48 v and 72 v. also, a plot of efficiency vs. load current, as a function of ambient temperature with vin = 48 v, airflow rate of 200 lfm (1 m/s) with vertical mounting is shown in fig. 4. power dissipation fig. 5 shows the power dissipation vs. load current plot for ta = 25 oc, airflow rate of 300 lfm (1.5 m/s) with vertical mounting and input voltages of 36 v, 48 v and 75 v. also, a plot of power dissipation vs. load current, as a function of ambient temperature with vin = 48 v, airflow rate of 200 lfm (1 m/s) with vertical mounting is shown in fig. 6. startup output voltage waveforms, during the turn-on transient using the on/off pin for full rated load currents (resistive load) are shown without and with external load capacitance in figs. 7-8, respectively.
mcd10127 rev. 1.1, 09-jun-10 page 9 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output dynamic load response figs. 9-10 capture the converter?s loop response when subjected to a step load change of 50% load to 75% load to 50% load. two load slew rates are shown with minimal and maximum external capacitive loading conditions. ripple and noise fig. 11 shows the output voltage ripple waveform, measured at full rated load current with a 10 f tantalum and 1 f ceramic capacitor across the output. note that all output voltage waveforms are measured across a 1 f ceramic capacitor. the input reflected ripple current waveforms are obtained using the test setup shown in fig 12. the corresponding waveforms are shown in figs. 13-14. output current limiting fig. 15 shows the output load current behavior. fig. 16 illustrates the conv erter?s response to a shorted output condition. electromagnetic compatibility (emc) emc requirements must be met at the end-product system level, as no specific standards dedicated to emc characteristics of board mounted component dc-dc converters exist. however, power-one tests its converters to several system level standards, primary of which is the more stringent en55022, information technology equipment - radio disturbance characteristic s-limits and methods of measurement. an effective internal lc differential filter significantly reduces input reflected ripple current, and improves emc. with the addition of a simple external filter, the HBC48T25120 converter will pass the requirements of class b conducted emissions per en55022 and fcc requirements. please contact power-one applications engineering for details of this testing. temperature reference information fig. h: tc reference point location (w/o baseplate) fig. i: tb reference point location (w/ baseplate) tc top view 1 2 3 45 6 7 8 9 0.36" 0.88" tb
mcd10127 rev. 1.1, 09-jun-10 page 10 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output characterization (con?t) output current derating, f ( (t a & airflow) output derating current 0 4 8 12 16 20 24 28 25 40 55 70 85 ambient temperature (c) output current (a) 400 lfm 300 lfm 200 lfm 100 lfm 30 lfm fig. 1 : available load current vs. ambient air temperature and airflow rates for single board converter mounted horizontally with air flowing from pin 4 to pin 1, mosfet junction temperature 125 c, vin = 48 v. efficiency, f ( load current & vin) 0.76 0.8 0.84 0.88 0.92 0.96 0 5 10 15 20 25 30 load current [a] efficiency 36v 48v 75v fig. 3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 4 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. output derating current 0 4 8 12 16 20 24 28 25 40 55 70 85 ambient temperature (c) output current (a) 400 lfm 300 lfm 200 lfm 100 lfm 30 lfm fig. 2: available load current vs. ambient air temperature and airflow rates for converter with baseplate mounted horizontally with air flowing from pin 4 to pin 1, baseplate temperature 110 c, vin = 48 v. 0.86 0.88 0.9 0.92 0.94 0.96 0 5 10 15 20 25 30 iout [a] efficiency 40c 55c 70c fig. 4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 4 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10127 rev. 1.1, 09-jun-10 page 11 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output power dissipation, f ( (load current & vin) 0 5 10 15 20 25 30 0 5 10 15 20 25 30 load current [a] power dissipation [w] 36v 48v 75v fig. 5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 4 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. vo startup fig. 7: turn-on transient at full rated load current (resistive) with no output capacitor at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (5 v/div.). time scale: 5 ms/div. 0 5 10 15 20 25 30 0 5 10 15 20 25 30 iout [a] power displation [w] 40c 55c 70c fig. 6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 4 to pin 1 at a rate of 200 lfm (1.0 m/s). fig. 8: turn-on transient at full rated load current (resistive) plus 15,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (5 v/div.). time scale: 5 ms/div.
mcd10127 rev. 1.1, 09-jun-10 page 12 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output dynamic load response fig. 9: output voltage response to load current stepchange (12.5 a ? 18.75 a ? 12.5 a) at vin = 48 v. top trace: output voltage (20 mv/div.). bottom trace: load current (10 a/di v.). current slew rate: 0.1 a/s. co = 10uf tantalum + 1 f ceramic. time scale: 0.2 ms/div. output ripple fig. 11: output voltage ripple (20 mv/div.) at full rated load current into a resistive load with co = 10 f tantalum + 1 f ceramic and vin = 48 v. time scale: 1 s/div. fig. 10: output voltage response to load current stepchange (12.5 a ? 18.75 a ? 12.5 a) at vin = 48 v. top trace: output voltage (20 mv/div.). bottom trace: load current (10 a/div.). current slew rate: 1 a/s. co = 15,000 uf oscon + 1 f ceramic. time scale: 0.2 ms/div. fig. 12: test setup for measuring input reflected ripple currents, i c and i s. module
mcd10127 rev. 1.1, 09-jun-10 page 13 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output input reflected ripple current fig. 13: input reflected ripple current, i c (200 ma/div.), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 12 for test setup. time scale: 1 s/div. output current limiting 0 2 4 6 8 10 12 14 0 5 10 15 20 25 30 35 iout [a] vout [v] fig. 15: output voltage vs. load current showing current limit point and converter shutdown point. input voltage has almost no effect on current limit characteristic. fig. 14: input reflected ripple current, i s (10 ma/div.), measured through 10 h at the source at full rated load current and vin = 48 v. refer to fig. 12 for test setup. time scale: 1 s/div. fig. 16: load current (top trace, 20 a/div., 50 ms/div.) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div., 2 ms/div.) is an expansion of the on-time po rtion of the top trace.
mcd10127 rev. 1.1, 09-jun-10 page 14 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output conducted emi, input lines the following conducted emi f ilter configuration and component values are offered as a guideline to assist in designing an effective filter solution in the customer?s application. many factors can affect overall emi performance; such as layout, wire routing and load characteristics, among others. as a result, the final circuit configuration and component values may differ from that below. ref. des description manufacturer c2 3.3 f @100v mlc avx or equivalent c7, 8, 9 100 f @ 100v alum. electrolytic panasonic ngh series or equiv. c5, 6, c10, 11 10,000 pf @ 1,000v mlc avx or equivalent f1 f4810 input filter module power-one c1 not used fig. 18: emi filter configuration & component list fig. 19: conducted emi scan of the HBC48T25120 (w/ input filter components per table above.) test conditions: vin = 48 vdc, io = 80% rated (300 watts) test specification: (cispr-22) ne55022 class b (peak detect)
mcd10127 rev. 1.1, 09-jun-10 page 15 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output physical information figure j: HBC48T25120-xcx0 (w/o baseplate) figure k: HBC48T25120-xcxb (w/ baseplate) pad/pin connections pad/pin # function 1 vin (+) 2 on/off 3 case (b option) 4 vin (-) 5 vout (-) 6 sense(-) 7 trim 8 sense(+) 9 vout (+) HBC48T25120 platform notes ? all dimensions are in inches [mm] ? pins 1-4 and 6-8 are ? 0.040? [1.02] with ? 0.078? [1.98] shoulder ? pins 5 and 9 are ? 0.080? [2.03] without shoulder ? pin material & finish: cda 360 (brass) with 200-300 u" matte sn over 100-150 u" ni ? converter weight: 2 oz [56.7 g] (stand alone) ? converter weight: 3 oz [85 g] (heat sink mountable) tolerances: (unless otherwise indicated) x.xxx in. +/- .010 [x.xx mm +/- 0.25] x.xx in. +/- .020 [x.x mm +/- 0.5]
mcd10127 rev. 1.1, 09-jun-10 page 16 of 16 www.power-one.com HBC48T25120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 25 a output converter part number ordering information product series input voltage mounting scheme rated load current output voltage on/off logic maximum height [ht] pin length [pl] special features environmental hbc 48 t 25 120 - n c a 0 half- brick format 36-75 v t ? through- hole 25 a 120 ? 12 v n ? negative p ? positive through hole c ? 0.50? through hole a ? 0.188? b ? 0.145? 0 ? std. b ? baseplate no suffix ? rohs lead- solder exemption compliant g ? rohs lead-free solder compliant the example above describes p/n HBC48T25120-nca0: 36-75 v inpu t, through-hole mounting, 25 a @ 12 v output, negative on/off log ic, a maximum height of 0.50?, a through the board pin length of 0.188?, a single board (no baseplat e), and eutectic tin/lead solder 1 . please consult factory for the comple te list of available options. 1 [suffix option ?xxxx _ ] the solder exemption is for customers choosing to elect the exemptions for lead in solders for servers, storage and storage array systems, and network infrastructure equipment for switching, signaling, transmission, and network management for telecommunications. nuclear and medical applications - power-one products are not des igned, intended for use in, or aut horized for use as critical components in life support systems, equipment used in hazardous envi ronments, or nuclear control systems without the express wr itten consent of the respecti ve divisional president of power-one, inc. technical revisions - the appearance of pr oducts, including safety agency certific ations pictured on labels, may change dependi ng on the date manufactured. specifications are subject to change without notice. pin option pl pin len g th 0.005 [0.13] a 0.188 [4.78] b 0.145 [3.68] height option ht ( max. hei g ht ) cl ( min. clea r ance ) c ? 0.020 [+0.5] +0.016 [+0.41] -0.000 [- 0.00] c 0.50 [12.7] 0.035 [0.89]

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