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jun 15, 2007 page 1 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output description the asq48 series dc-dc converters are ideally suited for aerospace applications where hi gh-reliability, low profile, and low weight are critical. they are designed for reliable opera- tion in harsh thermal and mechanical environments. in high-ambient temperature applications the asq48 series 15a converters provide therma l performance that exceeds most competing dc-dc conver ters that have a higher nominal rating and much larger package size. this is accomplished using patent pending circuit, packaging, and processing techniques to achieve ultra-high efficiency, excellent thermal management and a very low body profile. coupled with power-one?s use of 100% automation for assembly; this results in a product with extremely high quality and reliability. available in both through-hole and surface mount packages, the asq48 series converters are also ideal for environ- ments with little or no airflow. ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 500 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 air- flow rates for asq48t15033 converter with d height pins mounted vertically with air flowing from pi n 3 to pin 1, mosfet temperature 120 c, vin = 48 v. asq48t15033 and asq48s15033 converters features ? rohs lead solder exemption compliant ? delivers up to 15 a (50 w) ? operates from - 55 c to 85 c ambient ? survives 1000 g mechanical shock, mil-std-883e ? high reliability: mtbf 3.4 million hours, calculated per telcordia tr-332, method i case 1 ? available in through-hole and sm packages ? low weight: 0.53 oz (15 g) ? low profile: 0.26? (6.6 mm) ? extremely small footprint: 0.896? x 2.30? (2.06 in 2 ) ? high efficiency ? no heat sink required ? on-board input differential lc-filter ? extremely low output and input ripple ? start-up into pre-biased output ? no minimum load required ? 2,000 vdc i/o isolation ? meets basic insulation requirements of en60950 ? meets input voltage transient of 100 v for 100 ms ? does not use opto-isolators ? fixed-frequency operation ? fully protected ? remote output sense ? output voltage trim range: +10%/-20% ? positive or negative logic on/off option ? ul 60950 recognized in u.s. & canada, and tuv cer- tified per iec/en 60950 ? meets conducted emissi ons requirements of fcc class b and en55022 class b with external filter ? all materials meet ul94, v-0 flammability rating
jun 15, 2007 page 2 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output electrical specifications conditions: t a =25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, unless otherwise specified. parameter notes min typ max units absolute maximum ratings input voltage continuous 0 80 vdc operating ambient temperature -55 85 c storage temperature -55 125 c 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 output characteristics external load capacitance plus full load (resistive) 15,000 f output current range 0 15 adc current limit inception non-latching 16.5 18 20 adc peak short-circuit current non-latching. short=10m ? . 16.5 30 40 a rms short-circuit current non-latching 5.3 arms isolation characteristics i/o isolation 2000 vdc isolation capacitance 160 f isolation resistance 10 m ? feature characteristics switching frequency 415 khz output voltage trim range 1 use trim equations on page 7 -20 +10 % remote sense compensation 1 percent of v out ( nom ) +10 % output over-voltage protection non-latching 117 122 127 % over-temperature shutdown (pcb) non-latching 125 c auto-restart period applies to all protection features 100 ms turn-on time from enable to 95% of v out ( nom ) 4 ms on/off control (positive logic) converter off -20 0.8 vdc converter on 2.4 20 vdc on/off control (negative logic) converter off 2.4 20 vdc converter on -20 0.8 vdc additional notes: 1. vout can be increased up to 10% via the sense leads or up to 10% via the trim function, however total output voltage trim fr om all sources should not exceed 10% of v out ( nom ), in order to insure specified operation of over-vol tage protection circuitry. see further discussion at end of output voltage adjust /trim section.
jun 15, 2007 page 3 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output electrical specifications (continued) conditions: t a =25 oc, airflow = 300 lfm (1.5 m/s), vin = 48 vdc, unless otherwise specified. parameter notes min typ max units input characteristics maximum input current 15 adc, 3.3 vdc out @ 36 vdc in 1.6 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 45 madc input reflected-ripple current see figure 24 - 25mhz bandwidth 7.5 ma pk-pk input voltage ripple rejection 120hz tbd db output characteristics output voltage set point (no load) 3.267 3.300 3.333 vdc output regulation over line 2 5 mv over load 2 5 mv output voltage range over line, load and temperature 2 3.250 3.350 vdc output ripple and noise - 25mhz bandwidth full load + 10 f tantalum + 1 f ceramic 30 50 mv pk-pk dynamic response load change 25% of iout max, di/dt = 0.1 a/ s co = 1 f ceramic (fig.19) 90 mv di/dt = 5 a/ s co = 450 f tant. + 1 f ceramic (fig.20) 100 mv setting time to 1% 100 s efficiency 100% load 88.5 % 50% load 89 % additional notes: 2. -55 oc to 85 oc
jun 15, 2007 page 4 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output physical information (through-hole) top view 1 2 3 7 8 6 5 4 side view 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 asq 48 t 15 033 - n b a 0 one-eighth brick format 36-75 v through- hole 15 adc 033 ? 3.3 v n ? negative p ? positive a ? 0.303? b ? 0.336? c ? 0.500? d ? 0.400? e ? 0.282? a ? 0.188? b ? 0.145? c ? 0.110? 0 ? std the example above describes p/n asq48t15033-nba0: 36-75 v inpu t, through-hole mounting, 15 a @ 3.3 v output, negative on/off lo gic, a maximum height of 0.336?, and a through the board pin length of 188?. please consult factory regardi ng availability of a specif ic version. 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 0.303 [7.69] 0.030 [0.77] a 0.188 [4.77] b 0.336 [8.53] 0.063 [1.60] b 0.145 [3.68] c 0.500 [12.70] 0.227 [5.77] c 0.110 [2.79] d 0.400 [10.16] 0.127 [3.23] e 0.282 [7.16] 0.009 [0.23] pin connections pin # function 1 vin (+) 2 on/off 3 vin (-) 4 vout (-) 5 sense(-) 6 trim 7 sense(+) 8 vout (+) ? ? pins 1-3 and 5-3.5 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 ? converter weight: 0.53 oz [15 g]
jun 15, 2007 page 5 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output physical information (surface mount) top view 1 2 3 7 8 6 5 4 side view converter part numbering scheme product series input voltage mounting scheme rated load current output voltage on/off logic maximum height pin length special features asq 48 s 15 033 - n s 0 0 one-eighth brick format 36-75 v surface mount 15 adc 033 ? 3.3 v n ? negative p ? positive s ? 0.273? 0 ? 0.00? 0 ? std the example above describes p/n asq48s15033-ns00: 36-75 v inpu t, surface mounting, 15 a @ 3.3 v output, negative on/off logic. please consult factory regarding availab ility of a specific version. pin connections pin # function 1 vin (+) 2 on/off 3 vin (-) 4 vout (-) 5 sense(-) 6 trim 7 sense(+) 8 vout (+) ? ? connector material: copper ? connector finish: tin/lead over nickel optional: gold over nickel ? converter weight: 0.53 oz [15 g] ? recommended surface-mount pads: min. 0.080? x 0.112? [2.03 x 2.84] max. 0.092? x 0.124? [2.34 x 3.15]
jun 15, 2007 page 6 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output operation input and output impedance these power converters have been designed to be stable with no external capacitors when used in low inductance in- put and output circuits. however, in many applications , the inductance associated with the distribution from the pow er source to the input of the converter can affect the stabilit y of the converter. the addi- tion of a 33 f electrolytic capacitor with an esr < 1 across the input helps ensure st ability of the converter. in many applications, the user has to use decoupling capaci- tance at the load. the power converter will exhibit stable operation with external load capacitance up to 15,000 f. on/off (pin 2) the on/off pin is used to turn the power converter on or off remotely via a system signal. there are two remote con- trol options available, positive logic and negative logic and both are referenced to vin(-). typical connections are shown in fig. 2. rload vin control input vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) (top view) converter semi q tm family fig. 2: 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 con- verter is on when the on/off pin is left open . 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 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 volt- age 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 (depending on the signal polarity) up to 1 ma. see the start-up 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 con- verter and the load. the sense(-) (pin 5) and sense(+) (pin 7) pins should be connecte d at the load or at the point where regulation is required (see fig. 3). 100 10 rw rw rload vin vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) (top view) converter semi q tm family fig. 3: remote sense circuit configuration. if remote sensing is not required, 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 t he specified output voltage. if these connections are not made, the converter will deliver an output voltage that is slightly higher than the specified 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 insure optimum performance. when wiring discretely, twisted pair wires should be used to connect the sense lines to the load to reduce susceptibility to noise. the converter?s output over-vol tage 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 capabil- ity of the converter, equal to the product of the nominal out- put voltage and the allowable ou tput current for the given conditions. when using remote sense, the output voltage at the con- verter can be increased by as much as 10% above the
jun 15, 2007 page 7 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output 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 con- verter?s actual output power remains at or below the maxi- mum allowable output power. output voltage adjust /trim (pin 6) the converter?s 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% is guar- anteed 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 con- nected internally between the trim and sense(-) pins. to increase the output voltage, refer to fig. 4. 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 previous section for a complete discussion of this requirement. to decrease the output voltage (fig. 5), 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 converter semi q tm family fig. 4: configuration for increasing output voltage . rload vin vin (+) vin (-) on/off vout (+) vout (-) trim sense (+) sense (-) r t-decr (top view) converter semi q tm family fig. 5: 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 over-voltage protec- tion (ovp) circuit. the designer should ensure that the dif- ference between the voltages ac ross the converter?s output pins and its sense pins does not exceed 0.33 v, or: 0.33 )] ( v ) ( [v )] ( v ) ( [v sense sense out out ? ? + ? ? ? + [v] this equation is applicable for any condition of output sens- ing and/or output trim.
jun 15, 2007 page 8 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output 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 cir- cuit conditions. upon sensing an overcurrent condition, the converter will switch to cons tant current operation and thereby begin to reduce output voltage. when the output voltage drops below 1.2 vdc, the converter will shut down (fig. 25). once the converter ha s shut down, it will attempt to restart nominally every 100 ms with a 1% duty cycle (fig 26). the attempted restart will continue indefinitely until the overload or short circuit conditions are removed or the output voltage rises above 1.2 vdc. 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 refer- ence, 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 overte mperature con- dition to protect itself from overheating caused by operation outside the thermal derating curves, or operation in abnor- mal conditions such as system fan failure. after the con- verter 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. a 4-a fuse is recommended for use with this product. if one input fuse is used for a group of modules, the maxi- mum fuse rating should not exceed 15-a (asq modules are ul approved with up to a 15-a fuse). electromagnetic compatibility (emc) emc requirements must be met at the end-product system level, as no specific standards dedicated to emc character- istics of board mounted component dc-dc converters exist. however, di/dt tests its conver ters to several system level standards, primary of which is the more stringent en55022, information technology equipment - radio disturbance char- acteristics - limits and methods of measurement. with the addition of a simple external filter (see application notes), the asq48t/s15 converters pass the requirements of class b conducted emissions per en55022 and fcc, and meet at a minimum, class a radiated emissions per en 55022 and class b per fcc title 47cfr, part 15-j. please contact di/dt applications enginee ring for details of this test- ing.
jun 15, 2007 page 9 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output characterization general information the converter has been characterized for many operational aspects, to include thermal derating (maximum load current as a function of ambient temperature and airflow) for vertical and horizontal mounting, effici ency, start-up and shutdown parameters, output ripple and no ise, transient response to load step-change, overload and short circuit. the following pages contain specific plots or waveforms as- sociated with the converter. a dditional 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, comprising two-ounce cop- per, were used to provide traces for connectivity to the con- verter. 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 pur- poses. all measurements requiring airflow were made in di/dt?s ver- tical and horizontal wind tunnel facilities 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 an- ticipates 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. thermo- graphic imaging is preferable; if this capability is not avail- able, then thermocouples may be used. di/dt recommends the use of awg #40 gauge thermocouples to ensure meas- urement accuracy. careful routing of the thermocouple leads will further minimize measurement error. refer to figure 27 for optimum measuring thermocouple location. thermal derating load current vs. ambient temperature and airflow rates are given in figs. 9-12 for through-hole and surface mount ver- sion. ambient temperature was varied between 25c and 85c, with airflow rates from 30 to 500 lfm (0.15 to 2.5 m/s), and vertical and horizontal converter mounting. 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 spec ified temperature (120c) as indicated by the thermographic image, or (ii) the nominal rating of the converter (15 a). during normal operation, derati ng curves with maximum fet temperature less or equal to 120c should not be exceeded. temperature on the pcb at the thermocouple location shown in fig. 27 should not exceed 118c in order to oper- ate inside the derating curves. efficiency figure 13 shows the efficiency vs. load current plot for ambi- ent temperature of 25 oc, airflow rate of 300 lfm (1.5 m/s) with converter mounted vertica lly, 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 converter mounted vertically is shown in fig. 14. power dissipation power dissipation vs. load current plot is shown in fig. 15 for ambient temperature of 25 oc, airflow rate of 300 lfm (1.5 m/s) with converter mounted vertically, 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) is shown for a vertically mounted converter in fig. 16 start-up 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 10,000 f load capacitance in figs. 17 and 18, respectively. ripple and noise figure 21 shows the output voltage ripple waveform, meas- ured 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 ca- pacitor. the input reflected ripple current waveforms are obtained using the test setup shown in fig 22. the corresponding waveforms are shown in figs. 23 and 24.
jun 15, 2007 page 10 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output start-up information (using negative on/off) scenario #1: initial start-up from bulk supply on/off function enabled, converte r started via application of v in . see figure 6. 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 (con- verter turn-on delay). t 3 converter v out reaches 100% of nominal value. for this example, the total converter start-up time (t 3 - t 1 ) is typically 4 ms. scenario #2: initial start-up using on/off pin with v in previously powered, converter started via on/off pin. see figure 7. 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 start-up 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 en- abled via on/off pin. see figure 8. 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 start-up 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 7. 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 start-up time (t 5 - t 2 ) is typically 104 ms. for (t 2 - t 1 ) > 100 ms , start-up will be typically 4 ms after release of on/off pin. fig. 6: start-up scenario #1. on/off state v out t 0 t 1 t 2 t 3 on off v in t fig. 7: start-up 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. 8: start-up scenario #3. v in on/off state v out t t 0 t 1 t 2 t 3 on off
jun 15, 2007 page 11 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 500 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. 9: available load current vs. ambient air temperature and airflow rates for asq48t15033 converter with d height pins mounted vertically with vin = 48 v, air flowing from pin 3 to pin 1 and maximum fet temperature 120 c. ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 500 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. 11: available load current vs. ambient temperature and airflow rates for asq48s15033 converter mounted vertically with vin = 48 v, air flowing from pin 3 to pin 1 and maximum fet temperature 120 c. ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 500 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. 10: available load current vs. ambient air temperature and airflow rates for asq48t15033 converter with d height pins mounted horizontally with vin = 48 v, air flowing from pin 3 to pin 1 and maximum fet temperature 120 c. ambient temperature [c] 20 30 40 50 60 70 80 90 load current [adc] 0 5 10 15 20 500 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. 12: available load current vs. ambient temperature and airflow rates for asq48s15033 converter mounted horizontally with vin = 48 v, air flowing from pin 3 to pin 1 and maximum fet temperature 120 c.
jun 15, 2007 page 12 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output load current [adc] 0 2 4 6 8 10 12 14 16 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 72 v 48 v 36 v fig. 13: efficiency vs. load current and input voltage for con- verter 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 2 4 6 8 10 12 14 16 power dissipation [w] 0.00 2.00 4.00 6.00 8.00 72 v 48 v 36 v fig. 15: 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] 0246810121416 efficiency 0.65 0.70 0.75 0.80 0.85 0.90 0.95 70 c 55 c 40 c fig. 14: 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] 0246810121416 power dissipation [w] 0.00 2.00 4.00 6.00 8.00 70 c 55 c 40 c fig. 16: power dissipation vs. load current and ambient tem- perature 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).
jun 15, 2007 page 13 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output fig. 17: 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. 19: output voltage response to load current step-change (3.75 a ? 7.5 a ? 3.75 a) at vin = 48 v. top trace: output volt- age (100 mv/div). bottom trace: l oad current (5 a/div.). current slew rate: 0.1 a/ s. co = 1 f ceramic. time scale: 0.2 ms/div. fig. 18: turn-on transient at full rated load current (resistive) plus 10,000 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. 20: output voltage response to load current step-change (3.75 a ? 7.5 a ? 3.75 a) at vin = 48 v. top trace: output volt- age (100 mv/div.). bottom trace: load current (5 a/div). current slew rate: 5 a/ s. co = 450 f tantalum + 1 f ceramic. time scale: 0.2 ms/div.
jun 15, 2007 page 14 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output fig. 21: output voltage ripple (20 mv /div.) at full rated load current into a resistive load with co = 10 f tantalum + 1uf ce- ramic and vin = 48 v. time scale: 1 s/div. fig. 23: input reflected ripple current, i c (100 ma/div), meas- ured at input terminals at full rated load current and vin = 48 v. refer to fig. 22 for test setup. time scale: 1 s/div. vout v source i s i c 1 f ceramic capacitor 10 h source inductance semi q tm family dc/dc converter 33 f esr <1 electrolytic capacitor fig. 22: test setup for measuring input reflected ripple currents, i c and i s . fig. 24: input reflected ripple current, i s (10 ma/div), measured through 10 h at the source at full ra ted load current and vin = 48 v. refer to fig. 22 for te st setup. time scale: 1 s/div.
jun 15, 2007 page 15 of 15 www.power-one.com asq48t15033 & asq48s15033 dc-dc converter data sheet 36 to 75 vdc input; 15a , 3.3 vdc output 5 20 4.0 iout [adc] vout [vdc] 0 0 2.0 1.0 10 15 3.0 fig. 25: output voltage vs. load current showing current limit point and converter shutdown poi nt. input voltage has almost no effect on current limit characteristic. fig. 26: load current (top trace, 20 a/di v, 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 expansi on of the on-time portion of the top trace. fig. 27: location of the thermocouple for thermal testing. 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 are subject to change without notice.

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