View QM48T40012-NABUG_6836743.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

mcd10048 rev. 1.0 page 1 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output applications ? telecommunications ? data communications ? wireless communications ? servers, workstations benefits ? high efficiency ? no heat sink required ? higher current capability at 70 oc than most competitors? 40 a half-bricks features ? rohs lead-free solder and lead-solder-exempted products are available ? delivers up to 40 a (132 w) ? industry-standard quarter-brick pinout ? on-board input differential lc-filter ? outputs available: 3.3, 2.5, 2.0, 1.8, 1.5, 1.2 & 1.0 v ? start-up into pre-biased load ? no minimum load required ? low profile: 0.31? [7.9 mm] ? low weight: 1.06 oz [30 g] ? meets basic insulation requirements of en60950 ? withstands 100 v input transient for 100 ms ? fixed-frequency operation ? 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 (except 1.2 v and 1.0 v outputs with trim range 10%) ? high reliability: mtbf = 2.6 million hours, calculated per telcordia tr-332, method i case 1 ? ul60950 recognized in us and canada and demko certified per iec/en60950 ? 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 qmax tm series of high current single output dc-dc converte rs set new standards for thermal performance and power density in the quarter-brick package. the 40 a qm48 converters of the qmax tm series provide outstanding thermal perf ormance in high temperature environments that is comparable to or exceeds the industry?s leading 40 a hal f-bricks. this performance is accomplished through the use of patended/patent-pending circuit, packaging, and processing techniques to achieve ul tra-high efficiency, excellent thermal management, and a very low-body profile. the 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 36-75 v input, the qmax tm series converters provide any standard ou tput voltage from 3.3 v down to 1.0 v. outputs can be trimmed from ?20% to +10% of the nominal output voltage (10% fo r output voltages 1.2 v and 1.0 v), thus providing outstanding design flexibility.
mcd10048 rev. 1.0 page 2 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications (common to all versions) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, all output voltages, unless otherwise specified. parameter notes min typ max units absolute maximum ratings in p ut volta g e continuous 0 80 vdc o p eratin g ambient tem p erature -40 85 c stora g e tem p erature -55 125 c input characteristics o p eratin g in p ut volta g e ran g e 36 48 75 vdc in p ut under volta g e lockout non-latchin g turn-on threshold 33 34 35 vdc turn-off threshold 31 32 33 vdc in p ut volta g e transient 100 ms 100 vdc isolation characteristics i/o isolation 2000 vdc isolation ca p acitance 1.4 nf isolation resistance 10 m ? feature characteristics switchin g fre q uenc y 415 khz out p ut volta g e trim ran g e 1 industr y -std. e q uations ( 3.3 - 1.5 v ) -20 +10 % use trim e q uation on pa g e 4 ( 1.2 - 1.0 v ) -10 +10 % remote sense com p ensation 1 percent of v out ( nom ) +10 % out p ut overvolta g e protection non-latchin g 117 128 140 % overtem p erature shutdown ( pcb ) non-latchin g 125 c auto-restart period a pp lies to all p rotection features 100 ms turn-on time 4 ms on/off control ( positive lo g ic ) converter off ( lo g ic low ) -20 0.8 vdc converter on ( lo g ic hi g h ) 2.4 20 vdc on/off control ( ne g ative lo g ic ) converter off ( lo g ic hi g h ) 2.4 20 vdc converter on ( lo g ic 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, total output voltage trim f rom all sources should not exceed 10% of v out ( nom ), in order to ensure specified operat ion of overvoltage protection circuitry.
mcd10048 rev. 1.0 page 3 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output operation 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 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 40,000 f on 3.3 ? 1.0 v outputs. 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 logic and negative logic with both referenced to vin(-). typical connections are shown in fig. a. rload control input vin (+) vin (-) on/ off vout (+) vout (-) trim sense (+) sense (-) (top view) converter qmax tm series vin 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 co nverter without the need of an external control signal. 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 sen se(-) (pin 5) and sense(+) (pin 7) pins should be connecte d at the load or at the point where regulation is required (see fig. b). 100 10 rw rw rload vin (+) vin (-) on/ off vout (+) vout (-) trim sense (+) sense (-) (top view) converter qmax tm series vin 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 should be 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, eq ual 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 actual output pow er remains at or below the maximum allowable output power.
mcd10048 rev. 1.0 page 4 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output output voltage adjust /trim (pin 6) the output voltage can be adjusted up 10% or down 20% for vout 1.5 v, and 10% for vout = 1.2 v and 1.0 v relative to the rated output voltage by the addition of an externally connected resistor. for 3.3 v output voltage, trim up to 10% is guaranteed only at vin 40 v, and it is marginal (8% to 10%) at vin = 36 v. 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 ](3.3-1.5 v) 7.2 84.6 r incr t ? = ? [k ] (1.2v) 9 120 r incr t ? = ? [k ] (1.0 v) 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 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 series qmax tm fig. c: configuration for incr easing 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 ] (for 3.3 - 1.5 v) 15 | | 700 r decr t ? = ? [k ] (1.2 v) 17 | | 700 r decr t ? = ? [k ] (1.0 v) where, = ? decr t r required value of trim-down resistor [k ] and 485 r incr t = ? [k ] (1.2 v) 2 ? = ? [k ] (1.0 v) 10.22 | | 511 r decr t ? = ? [k ] (for 1.2 v and 1.0 v) for 1.2 v only, ?u? version converter with a character ?u? in the part number uses the following trim equations: 100 r incr t = ? [k ] 2 | | 100 r decr t ? = ? [k ]
mcd10048 rev. 1.0 page 5 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output rload vin (+) vin (-) on/ off vout (+) vout (-) trim sense (+) sense (-) r t- decr (top view ) converter series tm qmax vin fig. d: configuration for decr easing 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. 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 at least 35 v for the converter to turn on. once the converter has been turned on, it will shut off when the input voltage drops below 31 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 converte r will shut down. once the converter ha s shut down, it will attempt to restart nominally every 100 ms with a typical 1-2% 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. 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 ha s shut down, it will attempt to restart every 100 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 operation 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 and en60950. 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. the table below provides the recommended fuse rating for use with this family of products. output voltage fuse rating 3.3 v 7.5 a 2.5 -1.8 v 5 a 1.5 - 1.0 v 3 a modules are ul approved for maximum fuse rating of 15 amps. to protect a group of modules with a single fuse, the rating can be increased from the recommended values 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 characterist ics - limits and methods of measurement.
mcd10048 rev. 1.0 page 6 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output an effective internal lc different ial filter significantly reduces input reflected ripple current, and improves emc. with the addition of a simple external filter, all versions of the qmax? series of converters pass the requirements of class b conducted emissions per en55022 and fcc, and meet at a minimum, class a radiated emissions per en55022 and class b per fcc title 47cfr, part 15-j. please contact power-one applications engineering for details of this testing. 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, effici ency, startup and shutdown parameters, output ripple and no ise, transient response to load step-change, overload, and short circuit. the figures are numbered as fig. x.y, where x indicates the different output voltages, and y associates with specific plots (y = 1 for the vertical thermal derating, ?). for example, fig. x.1 will refer to the vertical thermal derating for all the output voltages in general. the following pages contain specific plots or waveforms associated with the converte r. 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 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 scen ario for thermal derating purposes. all measurements requiring airflo w 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 thermocouple leads will further minimize me asurement error. refer to figure h for optimum measuring thermocouple location. thermal derating load current vs. ambient temperature and airflow rates are given in figs. x.1 and x.2 for vertical and horizontal converter mounting. 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 (120 c) as indicated by the thermographic image, or (ii) the nominal rating of the converter (40 a on 3.3 ? 1.0 v). during normal operation, derati ng curves with maximum fet temperature less or equal to 120 c should not be exceeded. temperature on the pcb at the thermocouple location shown in fig. h should not exceed 118 c in order to operate inside the derating curves. efficiency fig. x.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. x.4. power dissipation fig. x.5 shows the power dissi pation 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. x.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 fig. x.7 and fig. x.8, respectively.
mcd10048 rev. 1.0 page 7 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output ripple and noise fig. x.10 shows the output voltage ripple waveform, measured at full rated load curr ent 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 x.11. the corresponding waveforms are shown in fig. x.12 and fig. x.13. fig. h: location of the thermocoup le for thermal testing.
mcd10048 rev. 1.0 page 8 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output startup information (using negative on/off) scenario #1: initial startup from bulk supply on/off function enabled, converte r 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 under-voltage 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 (100 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 ) 100 ms , external action of on/off pin is locked out by startup inhibit timer. if (t 2 - t 1 ) > 100 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 ) 100 ms , the total converter startup time (t 5 - t 2 ) is typically 104 ms. for (t 2 - t 1 ) > 100 ms , startup will be typically 4 ms after release of on/off pin. 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. on/off state off on v out t 0 t 2 t 1 t 5 v in t t 4 t 3 100 ms fig. g: startup scenario #3. . v in on/off state v out t t 0 t 1 t 2 t 3 on off
mcd10048 rev. 1.0 page 9 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40033 (3.3 volts out) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, vout = 3.3 vdc unless otherwise specified. parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 3.3 vdc out @ 36 vdc in 4.1 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 63 madc in p ut reflected-ri pp le current 25 mhz bandwidth 7.5 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 3.267 3.300 3.333 vdc out p ut re g ulation over line 2 5 mv over load 2 5 mv out p ut volta g e ran g e over line , load and tem p erature 3.250 3.350 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 90.5 % 50% load 92.5 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 3.3v.1: available load current vs. ambient air temperature and airflow rates for qm48t40033 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 3.3v.2: available load current vs. ambient air temperature and airflow rates for qm48t40033 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v.
mcd10048 rev. 1.0 page 10 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40033 (3.3 volts out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 3.3v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 3.3v.5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 3.3v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 3.3v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 11 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40033 (3.3 volts out) fig. 3.3v.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 (1 v/div.) time scale: 2 ms/div. fig. 3.3v9: output voltage response to load current step-change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 3.3v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. fig. 3.3v.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.
mcd10048 rev. 1.0 page 12 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40033 (3.3 volts out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 3.3v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 3.3v12: 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. 3.3v.11 for test setup. time scale: 1 s/div. iout [adc] 15 60 4.0 vout [vdc] 0 0 2.0 1.0 30 45 3.0 fig. 3.3v.14: output voltage vs. load current showing current limit point and converter shutdown point. input voltage has almost no effect on current limit characteristic. fig. 3.3v13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 3.3v.11 for test setup. time scale: 1 s/div. fig. 3.3v.15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 1 ms/div) is an expansion of the on-time portion of the top trace.
mcd10048 rev. 1.0 page 13 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40025 (2.5 volts out) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, vout = 2.5 vdc unless otherwise specified. parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 2.5 vdc out @ 36 vdc in 3.2 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 50 madc in p ut reflected-ri pp le current 25 mhz bandwidth 10 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 2.475 2.500 2.525 vdc out p ut re g ulation over line 2 5 mv over load 2 5 mv out p ut volta g e ran g e over line , load and tem p erature 2.462 2.538 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 89 % 50% load 91 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 2.5v.1: available load current vs. ambient air temperature and airflow rates for qm48t40025 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 2.5v.2: available load current vs. ambient air temperature and airflow rates for qm48t40025 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection
mcd10048 rev. 1.0 page 14 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40025 (2.5 volts out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 2.5v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 2.5v.5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 2.5v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 2.5v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 15 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40025 (2.5 volts out) fig. 2.5v.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 (1 v/div.) time scale: 2 ms/div. fig. 2.5v.9: output voltage response to load current step-change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 2.5v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. fig. 2.5v.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.
mcd10048 rev. 1.0 page 16 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40025 (2.5 volts out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 2.5v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 2.5v.12: 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. 2.5v.11 for test setup. time scale: 1 s/div. 15 60 3.0 iout [adc] vout [vdc] 0 0 2.5 1.0 0.5 30 45 2.0 1.5 fig. 2.5v.14: output voltage vs. load current showing current limit point and conver ter shutdown point. input voltage has almost no effect on current limit characteristic. fig. 2.5v.13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 2.5v.11 for test setup. time scale: 1 s/div. fig. 2.5v.15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 1 ms/div) is an expansion of the on-time portion of the top trace.
mcd10048 rev. 1.0 page 17 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40020 (2.0 volts out) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, vout = 2.0 vdc unless otherwise specified. parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 2.0 vdc out @ 36 vdc in 2.6 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 40 madc in p ut reflected-ri pp le current 25 mhz bandwidth 7.5 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 1.98 2.000 2.02 vdc out p ut re g ulation over line 2 5 mv over load 2 5 mv out p ut volta g e ran g e over line , load and tem p erature 1.970 2.030 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 88 % 50% load 90 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 2.0v.1: available load current vs. ambient air temperature and airflow rates for qm48t40020 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 2.0v.2: available load current vs. ambient air temperature and airflow rates for qm48t40020 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v.
mcd10048 rev. 1.0 page 18 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40020 (2.0 volts out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 2.0v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 2.0v.5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 2.0v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 2.0v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 19 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40020 (2.0 volts out) fig. 2.0v.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 (1 v/div.) time scale: 2 ms/div. fig. 2.0v.9: output voltage response to load current step- change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 2.0v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. fig. 2.0v.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.
mcd10048 rev. 1.0 page 20 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40020 (2.0 volts out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 2.0v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 2.0v.12: 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. 2.0v.11 for test setup. time scale: 1 s/div. 15 60 3.0 iout [adc] vout [vdc] 0 0 2.5 1.0 0.5 30 45 2.0 1.5 fig. 2.0v.14: output voltage vs. load current showing current limit point and converter shutdown point. input voltage has almost no effect on current limit characteristic. fig. 2.0v.13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 2.0v.11 for test setup. time scale: 1 s/div. fig. 2.0v.15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 1 ms/div) is an expansion of the on-time portion of the top trace.
mcd10048 rev. 1.0 page 21 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40018 (1.8 volts out) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, vout = 1.8 vdc unless otherwise specified. parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 1.8 vdc out @ 36 vdc in 2.4 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 38 madc in p ut reflected-ri pp le current 25 mhz bandwidth 10 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 1.782 1.800 1.818 vdc out p ut re g ulation over line 2 4 mv over load 2 5 mv out p ut volta g e ran g e over line , load and tem p erature 1.773 1.827 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 87 % 50% load 89.5 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.8v.1: available load current vs. ambient air temperature and airflow rates for qm48t40018 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.8v.2: available load current vs. ambient air temperature and airflow rates for qm48t40018 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v.
mcd10048 rev. 1.0 page 22 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40018 (1.8 volts out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 1.8v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 1.8v.5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 1.8v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 1.8v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 23 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40018 (1.8 volts out) fig. 1.8v.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 (1 v/div.) time scale: 2 ms/div. fig. 1.8v.9: output voltage response to load current step-change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 1.8v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (1 v/div.). time scale: 2 ms/div. fig. 1.8v.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.
mcd10048 rev. 1.0 page 24 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40018 (1.8 volts out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 1.8v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 1.8v.12: 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. 1.8v.11 for test setup. time scale: 1 s/div. 15 60 3.0 iout [adc] vout [vdc] 0 0 2.5 1.0 0.5 30 45 2.0 1.5 fig. 1.8v.14: output voltage vs. load current showing current limit point and converter shutdo wn point. input voltage has almost no effect on current limit characteristic. fig. 1.8v.13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 1.8v.11 fo r test setup. time scale: 1 s/div. fig. 1.8v.15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 2 ms/div) is an expans ion of the on-time portion of the top trace.
mcd10048 rev. 1.0 page 25 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40015 (1.5 volts out) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, vout = 1.5 vdc unless otherwise specified . parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 1.5 vdc out @ 36 vdc in 2 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 32 madc in p ut reflected-ri pp le current 25 mhz bandwidth 7.5 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 1.485 1.500 1.515 vdc out p ut re g ulation over line 2 4 mv over load 2 4 mv out p ut volta g e ran g e over line , load and tem p erature 1.477 1.523 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 85.5 % 50% load 88 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.5v.1: available load current vs. ambient air temperature and airflow rates for qm48t40015 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.5v.2: available load current vs. ambient air temperature and airflow rates for qm48t40015 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v.
mcd10048 rev. 1.0 page 26 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40015 (1.5 volts out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 1.5v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 1.5v.5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 1.5v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 1.5v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 27 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40015 (1.5 volts out) fig. 1.5v.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 (0.5 v/div.) time scale: 2 ms/div. fig. 1.5v.9: output voltage response to load current step-change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 1.5v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (0.5 v/div.). time scale: 2 ms/div. fig. 1.5v.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.
mcd10048 rev. 1.0 page 28 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40015 (1.5 volts out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 1.5v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 1.5v.12: 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. 1.5v.11 for test setup. time scale: 1 s/div. 15 60 2.0 iout [adc] vout [vdc] 0 0 1.5 1.0 0.5 30 45 fig. 1.5v.14: output voltage vs. load current showing current limit point and conver ter shutdown point. input voltage has almost no effect on current limit characteristic. fig. 1.5v.13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 1.5v.11 for test setup. time scale: 1 s/div. fig. 1.5v.15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 1 ms/div) is an expansion of the on-time portion of the top trace.
mcd10048 rev. 1.0 page 29 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40012 (1.2 volts out) conditions: t a = 25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, vout = 1.2 vdc unless otherwise specified. parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 1.2 vdc out @ 36 vdc in 1.7 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 28 madc in p ut reflected-ri pp le current 25 mhz bandwidth 7.5 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 1.188 1.200 1.212 vdc out p ut re g ulation over line 1 3 mv over load 1 3 mv out p ut volta g e ran g e over line , load and tem p erature 1.182 1.218 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 83 % 50% load 86.5 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.2v.1: available load current vs. ambient air temperature and airflow rates for qm48t40012 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.2v.2: available load current vs. ambient air temperature and airflow rates for qm48t40012 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection
mcd10048 rev. 1.0 page 30 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40012 (1.2 volts out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 1.2v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 1.2v.5: power dissipation vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 1.2v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 1.2v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 31 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40012 (1.2 volts out) fig. 1.2v.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 (0.5 v/div.) time scale: 2 ms/div. fig. 1.2v.9: output voltage response to load current step- change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 1.2v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (0.5 v/div.). time scale: 2 ms/div. fig. 1.2v.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.
mcd10048 rev. 1.0 page 32 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40012 (1.2 volts out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 1.2v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 1.2v.12: 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. 1.2v.11 for test setup. time scale: 1 s/div. 15 60 iout [adc] vout [vdc] 0 0 30 45 1.5 1.0 0.5 fig. 1.2v.14: output voltage vs. load current showing current limit point and converter shutdown point. input volt- age has almost no effect on current limit characteristic. fig. 1.2v.13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 1.2v.11 for test setup. time scale: 1 s/div. fig. 1.2v.15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 1 ms/div) is an expansion of the on- time portion of the top trace.
mcd10048 rev. 1.0 page 33 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output electrical specifications: qm48t40010 (1.0 volt out) conditions: t a = 25 oc, airflow=300 lfm (1.5 m/s), vin = 48 vdc, vout = 1.0 vdc unless otherwise specified. parameter notes min typ max units input characteristics maximum in p ut current 40 adc , 1.0 vdc out @ 36 vdc in 1.4 adc in p ut stand-b y current vin = 48 v , converter disabled 3 madc in p ut no load current ( 0 load on the out p ut ) vin = 48 v , converter enabled 27 madc in p ut reflected-ri pp le current 25 mhz bandwidth 7.5 ma pk-pk in p ut volta g e ri pp le re j ection 120 hz tbd db output characteristics out p ut volta g e set point ( no load ) -40 oc to 85 oc 0.990 1.000 1.010 vdc out p ut re g ulation over line 1 3 mv over load 1 3 mv out p ut volta g e ran g e over line , load and tem p erature 0.985 1.015 vdc out p ut ri pp le and noise ? 25 mhz bandwidth full load + 10 ? 50 60 a rms short-circuit current non-latchin g 10 15 arms dynamic response load chan g e 25% of iout max , di/dt = 1 a/ efficiency 100% load 81 % 50% load 85 % ambient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.0v.1: available load current vs. ambient air temperature and airflow rates for qm48t40010 converter with b height pins mounted vertically with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. a mbient tem p erature [ c ] 20 30 40 50 60 70 80 90 load current [adc] 0 10 20 30 40 50 500 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) nc - 30 lfm (0.15 m/s) fig. 1.0v.2: available load current vs. ambient air temperature and airflow rates for qm48t40010 converter with b height pins mounted horizontally with air flowing from pin 3 to pin 1, mosfet temperature 120 c, vin = 48 v. note: nc ? natural convection
mcd10048 rev. 1.0 page 34 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40010 (1.0 volt out) load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 1.0v.3: efficiency vs. load current and input voltage for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 72 v 48 v 36 v fig. 1.0v.5: power dissipation vs. load current and input volt- age for converter mounted vertically with air flowing from pin 3 to pin 1 at a rate of 300 lfm (1.5 m/s) and ta = 25 c. load current [adc] 0 1020304050 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 1.0v.4: efficiency vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s). load current [adc] 0 1020304050 p ower di ss i pa ti on [w] 0.00 4.00 8.00 12.00 16.00 70 c 55 c 40 c fig. 1.0v.6: power dissipation vs. load current and ambient temperature for converter mounted vertically with vin = 48 v and air flowing from pin 3 to pin 1 at a rate of 200 lfm (1.0 m/s).
mcd10048 rev. 1.0 page 35 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40010 (1.0 volt out) fig. 1.0v.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 (0.5 v/div.) time scale: 2 ms/div. fig. 1.0v.9: output voltage response to load current step-change (20 a ? 30 a ? 20 a) at vin = 48 v. top trace: output voltage (100 mv/div.). bottom trace: load current (10 a/div). current slew rate: 1 a/ s. co = 470 f tantalum + 1 f ceramic. time scale: 0.2 ms/div. fig. 1.0v.8: turn-on transient at full rated load current (resistive) plus 40,000 f at vin = 48 v, triggered via on/off pin. top trace: on/off signal (5 v/div.). bottom trace: output voltage (0.5 v/div.). time scale: 2 ms/div. fig. 1.0v.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.
mcd10048 rev. 1.0 page 36 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output qm48t40010 (1.0 volt out) vout v source i s i c 1 f ceramic capacitor 10 h source inductance dc-dc converter 33 f esr < 1 electrolytic capacitor series qmax tm fig. 1.0v.11: test setup for measuring input reflected ripple currents, i c and i s . fig. 1.0v.12: 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. 1.0v.11 for test setup. time scale: 1 s/div. 15 60 iout [adc] vout [vdc] 0 0 30 45 1.5 1.0 0.5 fig. 1.0v14: output voltage vs. load current showing current limit point and converter shutdown point. input voltage has almost no effect on current limit characteristic. fig. 1.0v.13: input reflected ripple current, i c (100 ma/div), measured at input terminals at full rated load current and vin = 48 v. refer to fig. 1.0v.11 for test setup. time scale: 1 s/div. fig. 1.0v15: load current (top trace, 20 a/div, 20 ms/div) into a 10 m ? short circuit during restart, at vin = 48 v. bottom trace (20 a/div, 1 ms/div) is an expansion of the on-time portion of the top trace.
mcd10048 rev. 1.0 page 37 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output physical information side view top view 1 2 3 7 8 6 5 4 pin connections pin # function 1 vin (+) 2 on/off 3 vin (-) 4 vout (-) 5 sense(-) 6 trim 7 sense(+) 8 vout (+) ht (maximum height) cl (minimum clearance) pl (pin length) height option +0.000 [+0.00] -0.038 [-0.97] +0.016 [+0.41] -0.000 [-0.00] pin option 0.005 [0.13] a 0.325 [8.26] 0.030 [0 .77] a 0.188 [4.77] b 0.358 [9.09] 0.063 [1 .60] b 0.145 [3.68] d 0.422 [10.72] 0.127 [3.2 3] c 0.110 [2.79] ? ? 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 ? pin finish: tin/lead over nickel or matte tin over nickel for ?g? version ? converter weight: 1.06 oz [30 g]
mcd10048 rev. 1.0 page 38 of 38 www.power-one.com qm48t40 dc-dc converter data sheet 36-75 vdc input; 1.0-3.3 vdc @ 40 a output converter part numbering scheme product series input voltage mounting scheme rated load current output voltage on/off logic maximum height (ht) pin length (pl) special features environ- mental qm 48 t 40 033 - n b a 0 quarter- brick format 36-75 v through- hole 40 a (1.0- 3.3 v) 010 ? 1.0 v 012 ? 1.2 v 015 ? 1.5 v 018 ? 1.8 v 020 ? 2.0 v 025 ? 2.5 v 033 ? 3.3 v n ? negative p ? postive a ? 0.325? b ? 0.358? d ? 0.422? a ? 0.188? b ? 0.145? c ? 0.110? 0 ? std u ? special trim 2 (for 1.2 v only) t ? special trim 2 (for 1.2 v & 1.0 v only) no suffix ? rohs lead-solder- exemption compliant g ? rohs compliant for all six sub- stances 1. the example above describes p/n qm48t40033-nba0: 36-75 v i nput, through-hole mounting, 40 a @ 3.3 v output, negative on/off logic, a maximum height of 0.358?, a through the board pin length of 0. 188?, and eutectic tin/lead solder. please consult factory for th e complete list of available options. 2. for definitions, operation, and associat ed trim equations for all trim options, pleas e refer to trim feature for isolated dc -dc converters application note. model numbers highlighted in yellow or s haded are not recommended for new designs. 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 env ironments, or nuclear control systems without the express written consent of th e respective divisional president of power-one, inc. technical revisions - the appearance of products, including safe ty agency certifications pictured on labels, may change dependi ng on the date manufactured. specifications ar e subject to change without notice.

▲Up To Search▲

Price & Availability of QM48T40012-NABUG

	To Download QM48T40012-NABUG Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .