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bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 1 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet applications ? telecommunications ? data communications ? wireless communications ? servers, workstations benefits ? high efficiency ? no heat sink required ? higher current capability at elevated temperatures than competitors? 30 a quarter-bricks ? extremely small footprint: 0.896? x 2.30? (2.06 in 2 ), 38% narrower width than conventional quarter-bricks features ? rohs lead-free solder and lead-solder-exempted products are available ? delivers up to 30 a ? industry-standard quarter-brick pinout ? on-board input differential lc-filter ? start-up into pre-biased load ? no minimum load required ? weight: 0.88 oz [25.1 g] ? meets basic insulation requirements of en60950 ? withstands 100 v input transient for 100 ms ? fixed-frequency operation ? fully protected ? remote output sense ? positive or negative logic on/off option ? low height of 0.374? (9.5mm) ? output voltage trim range: +10%/?20% with industry-standard trim equations ? high reliability: mtbf = 16.5 million hours, calculated per telcordia sr-332, method i case 1 ? agency approved to ul60950/csa60950-1 2nd edition and en/iec60950-1 2nd edition ? 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 new high performance 30a sqe48t30010 dc-dc converter provides a high efficiency single output, in a physical package that is only 62% the width of the indu stry-standard quarter-brick. specifically designed for operation in systems that have lim ited airflow and increased ambient temperatures, the sqe48t30010 converter utilizes the same pinout and functionality of the industry-standard quarter-bricks. the sqe48t30010 converter provides thermal performance in high temperature environ ments that exceeds most 30a quarter-bricks in the market. this performance is accomplished through the use of patented/patent-pending circuits, packaging, and processing techniques to achi eve ultra-high efficiency, excellent thermal management, and a low-body profile. low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing cooling for both upstream and downstream devices. 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 36-75v input, the sqe48t30010 converter provides a 1.0v output voltage that can be trimmed from ?20% to +10% of the nominal output voltage, thus providing outstanding design flexibility. with standard pinout and trim equations, the converter is a perfect drop-in replacement for existing 30a quarter- brick designs. inclusion of this converter in a new design can result in significant board space and cost savings. the designer can expect reliability im provement over other available conv erters because of the sqe48t30010?s optimized thermal efficiency.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 2 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet 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 -0.3 80 vdc operating ambient tem perature -40 85 c operating altitude iout = 30a 32800 ft storage temperature -55 125 c isolation characteristics standard product: option 0 (refer to converter part nu mbering/ordering information) i/o isolation 2250 vdc isolation capacitance 190 pf isolation resistance 10 m ? option k (refer to converter part numbering/ordering information) i/o isolation 1500 vdc isolation capacitance 1500 1800 pf isolation resistance 10 m ? feature characteristics switching frequency 320 khz output voltage trim range 1 -20 +10 % remote sense compensation 1 percent of v out ( nom ) +10 % output overvoltage protecti on non-latching 117 122 135 % overtemperature shutdown (pcb) non-latching 125 130 c operating humidity non-condensing 95 % storage humidity non-condensing 95 % peak amplitude 1 adc peak back-drive output current (sinking current from external source) during startup into pre-biased output peak duration 50 s back-drive output current (sinking current from external source) converter off; external voltage 5 vdc 10 50 madc auto-restart period applies to all protection features 200 ms turn-on time see figs. e, f, and g 7 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 high) 2.4 20 vdc converter on (logic low) -20 0.8 vdc additional notes: 1 vout can be increased up to 10% via the sens e leads or 10% via the trim function. however, the total output voltage trim from all sources should not exceed 10% of v out ( nom ), in order to ensure specified operat ion of overvoltage protection circuitry.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 3 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet electrical specifications (continued) 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 input characteristics operating input voltage range 36 48 75 vdc input undervoltage lockout turn-on threshold 33 35.5 vdc turn-off threshold 32.5 34.5 vdc lockout hysteresis voltage 1.0 2.0 vdc input voltage transient 100 ms 100 vdc input voltage transient rate 7 v/ms input current transient rate 0.1 a 2 s maximum input current 30 adc out @ 36 vdc in v out = 1.0 vdc 1.1 adc input standby current vin = 48v, converter disabled 5 ma input no load current (0a load on the output) vin = 48v, converter enabled v out = 1.0 vdc 20 ma input reflected-ripple current, i s vin = 48v, 25 mhz bandwidth v out = 1.0 vdc 30 ma pk-pk input voltage ripple rejection 120 hz, v out = 1.0 vdc 60 db
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 4 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet electrical specifications (continued) 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 output characteristics external load capacitance plus full load (resistive) 10,000 f output current range 0 30 adc current limit inception non-latching 32.6 37 41 adc peak short-circuit current non-latching, short = 10 m ? 61 a rms short-circuit current non-latching 8 10 arms output voltage set point (no load) 2 -1.5 +1.5 %vout output regulation over line 2 5 mv over load 2 5 mv output voltage range over line, load and temperature 2 -3.0 +3.0 %vout output ripple and noise ? 25 mhz bandwidth full load + 10 f tantalum + 1 f ceramic v out = 1.0 vdc 30 50 mv pk-pk dynamic response load change 25%-50%-25% of iout max, di/dt = 0.1 a/s co = 1 f ceramic ( figure 8 ) 30 3 mv load change 50%-75%-50% of iout max, di/dt = 5 a/s co = 470 f pos + 1 f ceramic 150 mv settling time to 1% of vout 15 s efficiency 100% load v out = 1.0 vdc 87.0 % 50% load v out = 1.0 vdc 88.0 % mechanical weight 25.1g vibration iec class 3m5 freq. velocity iec 68-2-6 5-9hz 5mm/s freq. accelerate. iec 68-2-6 9-200hz 1g shocks iec class 3m5 accelerate. iec 68-2-29 10g mil-std-202f method 213b cond. f reliability mtbf telcordia sr-332, method i case 1 50% electrical stress, 40c ambient 16.5 mhrs additional notes: 2 operating ambient temperature range of -40 oc to 85 oc for converter. 3 see waveforms for dynamic response and settling time for different output voltages.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 5 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet 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. however, in some applications, the inductance associated with the dist ribution from the power source to the input of the converter can affect the stability of the converter. the addition of a 33 f electrolytic capacitor with an esr < 1 ? across the input helps to ensure stability of the converter. in many applications, the user has to use decoupling capacitance at the load. the power converter will exhibit stable operation with external load capacitance up to 10,000 f. 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. rload vin control input vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) (top view) sqe48 converter 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 hard wired 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 v through a resistor. a properly de-bounced mech- anical 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 5 and 7) 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 5) and sense(+) (pin 7) pins should be connected at the load or at the point where regulation is required (see fig. b). 100 10 rw rw rload vin vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) (top view) sqe48 converter fig. b: remote sense circuit configuration. caution if remote sensing is not utilized, the sense(-) pin must be connected to the vout(-) pin (pin 4), and the sense(+) pin must be connected to the vout(+) pin (pin 8) to ensure the converter will regulate at the specified output voltage. if these connections are not made, the converter will deliver an output voltage that is higher than the specified 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) 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. 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
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 6 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet actual output power remains at or below the maximum allowable output power. output voltage adjust /trim (pin 6) 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. 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(-) pins. to increase the output voltage, refer to fig. c. a trim resistor, r t-incr , should be connected between the trim (pin 6) and sense(+) (pin 7), with a value of: 9 120 r incr t ? ? ? [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. rload vin vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) r t-incr (top view) sqe48 converter fig. c: configuration for increasing output voltage. to decrease the output voltage (fig. d), a trim resistor, rt-decr, shoul d be connected between the trim (pin 6) and sense(-) (pin 5), with a value of: 17 | | 700 r decr t ? ? ? [k ? ] where, ? ? decr t r required value of trim-down resistor [k ? ] and sqe48 converter 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 10% 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.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 7 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet protection features input undervoltage lockout 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. if the converter is equipped with the special ocp version designated by the suffix k in the part number, the converter will shut down approximately 15ms after entering the constant current mode of operation. the standard version (suffix 0) will continue operating in the constant current mode until the output voltage drops below 60% at which point the converter will shut dow n as shown in figure 14. once the converter has shut down, it will attempt to restart nominally every 200 ms with a typical 3-5% duty cycle as shown in figure 15. the attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 40-50% 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 8) and vout(-) (pin 4) exceeds the threshold of the ovp circuitry. the ovp circuitry contains its own reference, independent of the output voltage regulation loop. once the converter has shut down, it will attempt to re start every 200 ms until the ovp condition is removed. 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 failur e. converter with the non-latching option will automatically restart after it has cooled to a safe operating temperature. safety requirements the converters meet north american and international safety regulatory requirements per ul60950 and en60950. basic insulation is provided between input and output. the converters have no internal fuse. if required, the external fuse needs to be provided to protect the converter from catastrophic failure. refer to the ?input fuse selection for dc/dc converters? application note on www.power-one.com for proper selection of the input fuse. both input traces and the chassis ground trace (if applicable) must be capable of conducting a current of 1.5 times the value of the fuse without opening. the fuse must not be placed in the grounded input line. abnormal and component failure tests were conducted with the input protected by a 7a, 125vdc fuse. if a fuse rated greater than 7a, 125vdc is used, additional testing may be required. to protect a group of converters with a single fuse, the rating can be increased from the recommended value above. 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 sqe48t30010 converter passes the requirements of class b conducted emissions per en55022 and fcc requirements. please contact power-one applic- ations engineering for details of this testing.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 8 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet 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 (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 3 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 3 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 203 ms. for (t 2 - t 1 ) > 200 ms ; startup will be typically 3 ms after release of on/off pin. v in on/off state v out t t 0 t 1 t 2 t 3 on off fig. e: startup scenario #1. on/off state v out t 0 t 1 t 2 t 3 on off v in t fig. f: startup scenario #2. fig. g: startup scenario #3. on/off state off on v out t 0 t 2 t 1 t 5 v in t t 4 t 3 200 ms
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 9 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet 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 vertical and horizontal mounting, efficiency, startup and shutdown para- meters, 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 four-ounce copper, were used to provide traces for connectivity to the converter. the lack of metalization 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 oper- ating temperatures in the application. thermographic imaging is preferable; if th is capability is not avail- able, then thermocouples may be used. the use of awg #40 gauge thermocouples is recommended to ensure measurement accuracy. careful routing of the thermocouple leads will further minimize measurement error. refer to fig. h for the optimum measuring thermocouple locations. thermal derating load current vs. ambient temperature and airflow rates are given in figure 1. ambient temperature was varied between 25 c and 85 c, with airflow rates from 30 to 500 lfm (0.15 to 2.5 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 temperature of 120 c as indicated by the thermographic image, or (ii) the temperature of the transformer does not exceed 125 c, or (iii) the nominal rating of the converter (30 a at 1.0 v). during normal operation, derating curves with maximum fet temperature less or equal to 125 c should not be exceeded. temperature at both thermocouple locations shown in fig. h should not exceed 125 c in order to operate inside the derating curves. fig. h: locations of the thermocouple for thermal testing. efficiency figure 2 shows the efficiency vs. load current plot for ambient temperature of 25 oc, airflow rate of 300 lfm (1.5 m/s) with vertical mounting and input voltages of 36 v, 48 v, and 72 v. power dissipation figure 3 shows the power dissipation vs. load current plot for ta = 25 oc, airflow rate of 30 lfm (1.5 m/s) with vertical mounting and input voltages of 36 v, 48 v, and 72 v. 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 figure 6 and figure 7, respectively. ripple and noise figure 10 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 figure 11. the corresponding waveforms are shown in figure 12 and figure 13.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 10 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet current vs temperature@30lfm 0 5 10 15 20 25 30 35 0 20406080100 temperature current current figure 1. available load current vs. ambient air temperature for an sqe48t 30010 converter mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature ? 125 ? c, vin = 48 v. note: nc ? natural convection figure 2. efficiency vs. load current and input voltage for sqe48t30010 converter mounted horizontally. convection cooled with ta = 25 ? c. figure 3. power dissipation vs. load current and for sqe48t30010 converter mounted hor izontally. convection cooled with ta = 25 ? c.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 11 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet figure 4. vin versus output voltage for sqe48t30010 converter mounted horizontally. vin=48vdc, iout=30 amps and turned on using vcc. top trace: output voltage (0.5 v/div.). bottom trace: vcc (20 v/div.). time scale: 2 ms/div. convection cooled with ta=25 ? c. figure 5. vin versus output voltage for sqe48t30010 converter mounted horizontally. vin=48vdc, iout= 30 amps, cout=10,000uf and turned on using vcc. convection cooled with ta=25 ? c. top trace: output voltage (0.5 v/div.). bottom trace: vcc (20 v/div.). time scale: 2 ms/div. convection cooled with ta=25 ? c. figure 6. 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 (1.0 v/div.). time scale: 5 ms/div. top trace, iout=output voltage (0.5 v/div.). bottom trace: on/off signal (5 v/div.).time scale: 2 ms/div. figure 7. turn-on transient at full rated load current (resistive) plus 10,000 f at vin = 48 v, 30 amps and turned on using on/off pin. top trace, iout=output voltage (0.5 v/div.). bottom trace: on/off signal (5 v/di v.).time scale: 2 ms/div.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 12 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet figure 8. output voltage response to load current step-change (7.5a ? 15a ? 7.5a) at vin = 48 v. top trace: load current (5 a/div.) bottom trace: output voltage (50 mv/div.). current slew rate: 0.1 a/s. co = 1 f ceramic. time scale: 0.1 ms/div. figure 9. output voltage response to load current step-change (15a ? 22.5a ?15a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div.). current slew rate: 2.5 a/s. co = 470 f pos + 1 f ceramic. time scale: 0.1 ms/div. figure 10. 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. vout v source i s i c 1 ? f ceramic capacitor 10 ? h source inductance dc-dc converter 33 ? f esr < 1 electrolytic capacitor sqe48 figure 11. test setup for measuri ng input reflected ripple currents, ic and is. figure 12. input reflected-ripple current, is (10 ma/div.), measured through 10 h at the source at full rated load current and vin = 48 v. refer to figure 11 for test setup. time scale: 1 s/div.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 13 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet figure 13. input reflected ripple-current, ic (100 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. figure 14. output voltage vs. load current showing current limit point and converter shutdown point. input voltage has almost no effect on current limit characteristic. figure 15. load current (top trace, 10 a/div., 50 ms/div.) into a 10 m ? short circuit during restart, at vin = 48 v.
bcd.00005.1 rev aa, 17-aug-09 www.power-one.com page 14 of 14 sqe48t30010 dc-dc converter 36-75 vdc input; 1.0 vdc @ 30 a output data sheet physical information sqe48t pinout (through-hole) top view 1 2 3 7 8 6 5 4 side view converter part numbering/ordering information product series input voltage mounting scheme rated current output voltage on/off logic maximum height [ht] pin length [pl] special features rohs sqe 48 t 30 010 - n d a k g one- eighth brick format 36-75 v t ? through- hole 30 ? 30 adc 010 ? 1.0 v n ? negative p ? positive d ? 0.374? through hole a ? 0.188? b ? 0.145? 0 ? 2250vdc isolation, no cm cap k ? 1500vdc isolation, cm cap, and special ocp no suffix ? rohs lead-solder- exemption compliant g ? rohs compliant for all six substances the example above describes p/n sqe48t3001 0-ndakg: 36-75 v input, through-hole, 30a @ 1.0v output, negative on/off logic, maximum height of 0.374?, 0.188? pins, 1500vdc isolation, common mode capacitor, special ocp, and rohs compliant for all 6 subs tances. c onsult factory for availability of other options . notes: 1. nuclear and medical applications - power-one products are not designed, intended for use in, or authorized 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. 2. technical revisions - the appearance of products, including safety agency certifications pictured on labels, may change depe nding on the date manufactured. specifications are subject to change without notice. pad/pin connections pad/pin # function 1 vin (+) 2 on/off 3 vin (-) 4 vout (-) 5 sense(-) 6 trim 7 sense(+) 8 vout (+) ht ( max. hei g ht ) cl ( min. clea r ance ) height option +0.000 [+0.00] -0.038 [- 0.97] +0.016 [+0.41] -0.000 [- 0.00] d 0.374 [9.5] 0.045 [1.14] pl pin len g th pin option 0.005 [0.13] a 0.188 [4.78] b 0.145 [3.68] sqe48t platform notes ? all dimensions are in inches [mm] ? pins 1-3 and 5-7 are ? 0.040? [1.02] with ? 0.078? [1.98] shoulder ? pins 4 and 8 are ? 0.062? [1.57] without shoulder ? pin material: brass alloy 360 ? pin finish: tin over nickel

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