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zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 1 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet applications ? telecommunications ? data communications ? wireless communications ? servers, workstations benefits ? high efficiency ? no heat sink required features ? rohs lead free solder and lead-solder-exempted products are available ? delivers up to 20 a ? industry-standard quarter-brick pinout ? on-board input differential lc-filter ? startup into pre-biased load ? no minimum load required ? dimensions: 1.45? x 2.30? x 0.482? (36.83 x 58.42 x 12.24 mm) ? weight: 1.25 oz [35.85 g] ? meets basic insulation requirements of en60950 ? withstands 100 v input transient for 100 ms ? fixed-frequency operation ? fully protected ? remote output 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 ? ul/csa60950-1, en60950-1, and iec60950-1 safety approved ? 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 qme48t20120 converter of the qme-series provides outsta nding thermal performance in high temperature environments. this performance is accomplished through the use of patent ed/patent-pending circuits, packaging, and processing techniques to achieve ul tra-high efficiency, excellent thermal management, and a low-body profile. the low-body profile and the preclusion of heat sinks mi nimize 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, resu lts in a product with extremely high reliability. operating from a 36-75 v input, the qme-series converters provide outputs that can be trimmed from ?20% to +10% of the nominal output voltage, thus providing outstanding design flexibility.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 2 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet 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 0 80 vdc operating ambient temperature -40 85 c storage temperature -55 125 c isolation characteristics i/o isolation 2000 vdc isolation capacitance 3 f isolation resistance 10 m ? feature characteristics switching frequency 380 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 non-latching 117 122 127 % overtemperature shutdown (pcb) non-latching 125 c auto-restart period applies to all protection features 200 ms turn-on time 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 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 s ense leads or up to 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 operati on of overvoltage protection circuitry. 2 operating ambient temperature range of -40 oc to 85 oc for converter.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 3 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet 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 20 adc, 12 vdc out @ 36 vdc in 7.5 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 69 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 + 10 f tantalum + 1 f ceramic 60 120 mv pk-pk external load capacitance plus full load (resistive) 2,200 f output current range 0 20 adc current limit inception non-latching 22 24 26.6 adc peak short-circuit current non-latching, short = 10 m ? 50 a rms short-circuit current non-latching 5 arms dynamic response load change 50%-75%-50%, di/dt = 0.1 a/s co = 1 f ceramic 50 mv di/dt = 5 a/s co = 470 f pos + 1 f ceramic 120 mv settling time to 1% 30 s efficiency 100% load 93 % 50% load 94 %
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 4 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 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. 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 2,200 f on 12 v 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. rload vin control input vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) (top view) converter qme series 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 v through a resistor. a properly debounced 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 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) converter qme series 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 slightly 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)
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 5 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet 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 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. 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(-) 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: 10.22 1.225 626 )v 5.11(100 r nom o 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) converter qme series 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 6) and sense(-) (pin 5), with a value of: 10.22 | | 511 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 convent ional industry-standard quarter- bricks. rload vin vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) r t-decr (top view) converter qme series 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.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 6 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 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. 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 100 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 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 failure. after the converter has cooled to a safe operating temperature, it will automatically restart. safety requirements the converters are safety approved to ul/csa60950-1, en60950-1, and iec60950-1. 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 a fuse is recommended for use with this product. all qme converters are 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. 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, all versions of the qme-series of converters pass the requirements of class b conducted emissions per en55022 and fcc requirements. please contact power-one applications engineering for details of this testing.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 7 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 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 4 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. 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
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 8 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 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 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 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 operating temperatures in the application. thermographic imaging is preferable; if this capability is not available, then thermocouples may be used. the use of awg #40 gauge thermocouples is recommended to ensure measurement accuracy. careful routing of the ther mocouple leads will further minimize measurement error. refer to fig. h for the optimum measuring thermocouple location. fig. h: location of the thermocouple for thermal testing. thermal derating load current vs. ambient temperature and airflow rates are given in fig. 1 and fig. 2 for vertical and horizontal converter mountings. 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 specified temperature of 125 c as indicated by the thermographic image, or (ii) the nominal rating of the converter (20 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 should not exceed 125 c in order to operate inside the derating curves. efficiency fig. 3 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. 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 72 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. ripple and noise fig. 11 show 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.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 9 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 1 : available load current vs. ambient air temperature and airflow rates for converter with g height pins mounted vertically with air flowing from pin 1 to pin 3, mosfet temperature ? 125 ? c, vin = 48 v. load current [adc] 0 4 8 12162024 efficiency 0.70 0.75 0.80 0.85 0.90 0.95 1.00 72 v 48 v 36 v fig. 3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 1 to pin 3 at a rate of 300 lfm (1.5 m/s) and ta = 25 ? c. a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 25 500 lfm (2.5 m/s) 400 lfm (2.0 m/s) 300 lfm (1.5 m/s) 200 lfm (1.0 m/s) 100 lfm (0.5 m/s) 30 lfm (0.15 m/s) fig. 2: available load current vs. ambient air temperature and airflow rates for converter with g height pins mounted horizontally with air flowing from pin 1 to pin 3, mosfet temperature ? 125 ? c, vin = 48 v. load current [adc] 0 4 8 12162024 efficiency 0.75 0.80 0.85 0.90 0.95 1.00 70 c 55 c 40 c fig. 4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 1 to pin 3 at a rate of 200 lfm (1.0 m/s).
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 10 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet load current [adc] 0 4 8 12162024 p ower di ss i pa ti on [w] 0.00 5.00 10.00 15.00 20.00 25.00 72 v 48 v 36 v fig. 5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 1 to pin 3 at a rate of 300 lfm (1.5 m/s) and ta = 25 ? c. 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 (2 v/div.). time scale: 2 ms/div. load current [adc] 0 4 8 12162024 p ower di ss i pa ti on [w] 0.00 5.00 10.00 15.00 20.00 25.00 70 c 55 c 40 c fig. 6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 1 to pin 3 at a rate of 200 lfm (1.0 m/s). fig. 8: turn-on transient at full rated load current (resistive) plus 2,200 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: 2 ms/div.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 11 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet fig. 9: output voltage response to load current step- change (10 a ? 15 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (5 a/div.). current slew rate: 0.1 a/s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 11: output voltage ripple (50 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 step- change (10 a ? 15 a ? 10 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (5 a/div.). current slew rate: 5 a/s. co = 470 f pos + 1 f ceramic. time scale: 0.2 ms/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 qme series fig. 12: test setup for measuring input reflected-ripple currents, i c and i s .
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 12 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet fig. 13: input reflected ripple current, i c (500 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. iout [adc] 8 32 16.0 vout [vdc] 0 0 8.0 4.0 16 24 12.0 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 portion of the top trace.
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 13 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet physical information standard model (special features suffix -0) side view top view 1 2 3 7 8 6 5 4 ? 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 & finish: brass alloy 360 with matte tin over nickel optional model (special features suffix -t) ? all dimensions are in inches [mm] ? pins 1-3 are ? 0.040? [1.02] with ? 0.078? [1.98] shoulder ? pins 4 and 8 are ? 0.062? [1.57] with ? 0.096? [2.44] shoulder ? pin material: pins 1-3 brass a lloy 360, pins 4 and 8 ? copper alloy cda 145 ? pin finish - matte tin over nickel 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] g 0.482 [12.24] 0.035 [0.89] pl pin len g th pin option 0.005 [0.13] a 0.188 [4.78] b 0.145 [3.68] pad/pin connections pad/pin # function 1 vin (+) 2 on/off 3 vin (-) 4 vout (-) 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] g 0.482 [12.24] 0.035 [0.89] pl pin len g th pin option 0.005 [0.13] a 0.188 [4.78] side view top view 1 2 3 8 4
zd-01742 rev 3.4, 21-jan-10 www.power-one.com page 14 of 14 qme48t20120 dc-dc converter data sheet 36-75 vdc input; 12 vdc @ 20 a output data sheet optional model (special features suffix -w) ? all dimensions are in inches [mm] ? pins 1-3 and 5-7 are ? 0.040? [1.02] without shoulder ? pins 4 and 8 are ? 0.062? [1.57] without shoulder ? pin material & finish: brass alloy 360 with matte tin over nickel converter part numbering/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 qme 48 t 20 120 - n g b x y quarter- brick format 36-75 v t ? through- hole 20 a 120 ? 12 v n ? negative p ? positive g ? 0.482? a ? 0.188? b ? 0.145? 0 ? standard t ? no sense and trim pins (pins 5-7), pins 4 and 8 are ? 0.062? with ? 0.096? shoulder w ? straight 0.040? and 0.062? pins with ? 0.140? and ? 0.150? plastic standoffs no suffix character ? rohs lead- solder-exempt compliant g ? rohs compliant for all six substances example : qme48t20120-ngb0: 36-75 v input, through-hole mounting, 20 a @ 12 v output, negative on/off logic, a maximum height of 0.482?, a through the board pin length of 0.145?, and rohs lead-solder-exempt compliant. please consult factory for the complete list of available options . attention : special features option ?t? is only available with the 0.188? pin length 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 ce rtifications pictured on labels, may change depending 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] g 0.482 [12.24] 0.035 [0.89] pl pin len g th pin option 0.005 [0.13] a 0.188 [4.78] b 0.145 [3.68]

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