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5v and 3.3v, 2" x 2" 33 watt, dc/dc converters dual output mixed voltage, bwr models features figure 1. simpli ed schematic innovation and ex c ell e n c e ? ? ! ! ! ! ! ! ! ! ! ! ! ! ! ! regulated 3.3v and 5v outputs 5v @ 6amps/3.3v @ 7 amps capability 33 watts total output power no-load operation available input voltage ranges: 10-18v, 18-36v or 36-75v small 2" x 2" x 0.45" package ul1950 and en60950 safety approvals mark available (75v-input models) continuous short-circuit protection fully isolated, 1500vdc guaranteed 40 to +100? operating temperature input under and overvoltage shutdown output overvoltage protection thermal shutdown datel, inc., mans eld, ma 02048 (usa) ? tel: (508)339-3000, (800)233-2765 fax: (508)339-6356 ? email: sales@datel.co m ? internet: www.datel.com +input ?input switch control +5v output +3.3v output output return trim pwm controller reference & error amp opto isolation on/off control (sync) uv & ov comparators active bleeder thermal shutdown for applications requiring 33 watts of power from 5v and 3.3v, datel offers a new power sharing dc/dc converter capable of meeting your output current require- ments. the bwr-5/6-3.3/7-d48 (36-75v input), bwr-5/6-3.3/7-d24 (18-36v input) and bwr-5/6-3.3/7-d12 (10-18v input) are fully isolated dc/dc converters capable of delivering any combination of 5v and 3.3v loading up to a combined total of 33 watts of output power. housed in a standard 2" x 2" x 0.45" metal package coated with electrically non- conductive nish, these converters utilize a shared control-loop system to assure load regulation of ?% for 3.3v output and ?.5% for 5v output. all models include input pi ltering, input overvoltage and undervoltage shutdown circuitry, output overvoltage protection, output short-circuit and current limiting protection, and thermal shutdown. each design also provides trim capability, on/off control function, or an optional sync control. fully synchronous output recti cation renders high ef ciency and no-load operation. bwr power sharing modules offer low ripple and noise performance, high ef ciency (88%), 1500vdc of isolation voltage, and are fully speci ed for ?0 to +100? operation. these devices meet iec950, ul1950 and en6950 safety standards, including basic insulation requirements for "d48" models. cb reports are available on request. "d48" models are ce marked (meet lvd requirements).
33w, dual output, mixed-voltage dc/dc converters xwr series performance speci cations and ordering guide ? part number structure v 1 nominal output voltage: 5 volts 5 bwr 6 - / d48 - input voltage range: d12 = 10-18 volts (12v nominal) d24 = 18-36 volts (24v nominal) d48 = 36-75 volts (48v nominal) i 1 maximum output current: 6 amps dual output/ mixed-voltage series 3.3 7 / - s v 2 nominal output voltage: 3.3 volts i 2 maximum output current: 7 amps add "s" suf x as desired part number suf xes bwr 33 watt dc/dc's are designed so an on/off control function with positive polarity (no suf x) or a sync function ("s" suf x) can be added in the pin 4 position. no suf x on/off control function (positive polarity) on pin 4 s suf x sync function on pin 4 bwr-5/6-3.3/7-d12 5 6 40 100 ?% ?.5% ?.5% 12 10-18 70/3308 83% 86% c4, p33 3.3 7 95 140 ?.5% ?% ?.5% bwr-5/6-3.3/7-d24 5 6 40 100 ?% ?.5% ?.5% 24 18-36 50/1615 85% 88% c4, p33 3.3 7 95 140 ?.5% ?% ?.5% bwr-5/6-3.3/7-d48 5 6 40 100 ?% ?.5% ?.5% 48 36-75 25/780 85% 88% c4, p33 3.3 7 95 140 ?.5% ?% ?.5% ? typical at t a = +25? under nominal line voltage and balanced "full-load" conditions (5v @ 3.3a/3.3v @ 5a). ? any combination of 5v/3.3v rated i out current, not to exceed 33 watts of output power. (see derating graphs.) ? ripple/noise (r/n) measured over a 20mhz bandwidth. all models are speci ed with 1? ceramic output capacitors. output input ? tested from 10% load to 100% load (other output at 10% load). ? nominal line voltage, no load/balanced full-power condition. ? tested from no-load to 100% load (other output at no-load). ? output trim may impact 5v load regulation. r/n (mvp-p) ? regulation (max.) ? ef ciency package v out i out ? v in nom. range i in ? (case, model (volts) (amps) typ. max. line load ? no load ? (volts) (volts) (ma) min. typ. pinout) mec anical specifi cations 2 i/o connections pin function p33 1 +input 2 ?nput 3 no pin 4 on/off control 5 +5v output 6 output return 7 +3.3v output 8 trim notes: for "d12" and "d24" models the case is connected to pin 2 (?nput). for "d48" models, the case is connected to pin 1 (+input). case c4
bwr models 33w, dual output, mixed-voltage dc/dc converters performance/functional speci cations typical @ t a = +25? under nominal line voltage, balanced "full-load" conditions, unless noted. ? input input voltage range: d12 models 10-18 volts (12v nominal) d24 models 18-36 volts (24v nominal) d48 models 36-75 volts (48v nominal) overvoltage shutdown: ? d12 models 19-23 volts (21v nominal) d24 models 37-42 volts (40v nominal) d48 models 77-81 volts (79v nominal) start-up threshold: ? d12 models 9-10 volts (9.3v nominal) d24 models 16.5-18 volts (17v nominal) d48 models 34-36 volts (35v nominal) undervoltage shutdown: ? d12 models 8.5-9.6 volts (9.3v nominal) d24 models 16-17 volts (16.5v nominal) d48 models 32.5-35 volts (34v nominal) input current: normal operating conditions see ordering guide standby mode: off, ov, uv, thermal shutdown 10ma typical input re ected ripple current: source impedance <0.1 ? , no external input ltering d12 models 200map-p (150map-p typical) d24/d48 models 250map-p (225map-p typical) internal input filter type pi (0.022? - 4.7? - 2.46?) reverse-polarity protection: ? d12 models 1 minute duration, 6a maximum d24 models 1 minute duration, 4a maximum d48 models 1 minute duration, 2a maximum on/off control (pin 4): ? ? ? ? d12, d24 & d48 models on = open or 13v - +v in , i in = 50? max. off = 0-0.8v, i in = 1ma max. sync (option, pin 4): ? ? ? input threshold (rising edge active) 1-2.7 volts input voltage low 0-0.9 volts input voltage high 2.8-5 volts input resistance 35k ? minimum output high voltage (100? load) 3.5-4.8 volts output drive current 35ma input/output pulse width 160-360nsec output v out accuracy 5v output ?% maximum 3.3v output ?.5% maximum minimum loading per speci cation no load, see performance speci cations ripple/noise (20mhz bw) ? ? see ordering guide line/load regulation ? see ordering guide ef ciency see ordering guide / ef ciency curves cross regulation: ? 5v output (5v@0.6a, 3.3v@0.7-7a) ?% maximum 3.3v output (3.3v@0.7a, 5v@0.6-6a) ?.5% maximum trim range ? ?% isolation voltage: input-to-output 1500vdc minimum isolation capacitance 470pf isolation resistance 100m ? temperature coef cient ?.02%/per? output (continued) current limit inception: ? 5v @ 95% v out (3.3v @ 0a) 7.6-9.0 amps 3.3v @ 98.5% v out (5v @ 0a) 11.3-12.7 amps short circuit current : ? 5v output 5 amps average, continuous 3.3v output 6 amps average, continuous overvoltage protection: ? magnetic feedback 5v output 6.8 volts 3.3v output 4.5volts maximum capacitive loading d12 models 3.3v 1000? 5v 470? d24, d48 models 3.3v 2000? 5v 1000? dynamic characteristics dynamic load response: ? 5v (50-100% load step to 4% v out ) 300?ec maximum 3.3v (50-100% load step to 2.5% v out ) 300?ec maximum start-up time: ? v in to v out 20msec maximum on/off to v out 15msec maximum switching frequency 285khz (?5khz) environmental mtbf ? bellcore, ground xed, full power, +25? operating ambient temperature d12 models 1.3 million hours d24/d48 models 1.67 million hours operating temperature (ambient): ? without derating: d12 models ?0 to +50? d24 models ?0 to +60? d48 models ?0 to +68? with derating to +100? (see derating curves) case temperature: maximum operational +100? for thermal shutdown ? +110? minimum, +117? maximum storage temperature ?0 to +120? physical dimensions 2" x 2" x 0.45" (50.8 x 50.8 x 11.43mm) internal case connection: d12/d24 models ?nput (pin 2) d48 models +input (pin 1) case material corrosion resistant steel with non-conductive, epoxy-based, black enamel nish and plastic baseplate pin material brass, solder coated weight: 2.7 ounces (76.5 grams) primary to secondary insulation level d12/d24 models operational d48 models basic ? balanced "full-load" is 5v @ 3.3a/3.3v @ 5a. all models are speci ed with external 1? ceramic output capacitors. ? see technical notes/graphs for details. ? devices may be ordered with on/off control function or a sync function. see part number suf xes and technical notes for details. ? applying a voltage to on/off control (pin 4) when no input power is applied to the converter may cause permanent damage. ? output noise may be further reduced with the installation of additional external output capacitors. see technical notes. ? on/off control is designed to be driven with open collector or by appropriate voltage levels. voltages must be referenced to the input return pin (?nput). ? demonstrated mtbf available on request. 3
33w, dual output, mixed-voltage dc/dc converters xwr series 4 absolute maximum ratings input voltage: continuous: "d12" models 23 volts "d24" models 42 volts "d48" models 81 volts transient (100msec): "d12" models 25 volts "d24" models 50 volts "d48" models 100 volts input reverse-polarity protection ? input current must be limited. 1 minute duration. fusing recommended. "d12" models 6 amps "d24" models 4 amps "d48" models 2 amps output current ? current limited. devices can withstand an inde nite output short circuit. on/off control (pin 4) max. voltages referenced to ?nput (pin 2) no suf x +v in "s" suf x +5.7 volts storage temperature ?0 to +120? lead temperature (soldering, 10 sec.) +300? these are stress ratings. exposure of devices to any of these conditions may adversely affect long-term reliability. proper operation under conditions other than those listed in the performance/functional speci cations table is not implied, nor recommended. technical notes 5v & 3.3v regulation the bwr 33 watt series converters are designed such that both the 5v and 3.3v outputs share a common regulation feedback control loop. though the feedback loop is in uenced by both outputs, the 3.3 volt output is dominant. as a result, the 3.3 volt regulation (1%) is superior to the 5 volt regulation (1.5%). the converters are speci ed for load regulation of 10% to 100% loading and for no-load to 100% loading. operation below 10% of full load mandates an increase in the regulation tolerance of ?.5% for 3.3 volt output and an increase of ?% for the 5 volt output. a slight increase in switching noise may also be observed for operation below 10% loading. operation with a full load on 3.3 volt output and light to no load on 5 volt output is the most demanding for +5v regulation. under such conditions the internal "bleeder" circuit is activated to provide an internal load thereby keep- ing regulation within the published speci cations. the bleeder is activated gradually so as not to cause any erratic behavior on the converters outputs. a slight degradation in ef ciency will occur while this internal load is activated. filtering and noise reduction the bwr 33 watt series converters achieve their rated ripple and noise speci cations with the use of 1? output capacitors. in critical applications, input/output noise may be further reduced by installing additional external i/o capacitors. input capacitors should be selected for bulk capacitance, low esr and high rms-ripple-current ratings. output capacitors should be selected for low esr and appropriate frequency response. all caps should have appropriate voltage ratings and be located as close to the converter as possible. start-up time the v in to v out start-up time is the interval of time where the input voltage crosses the turn-on threshold point, and the fully loaded output voltage enters and remains within its speci ed accuracy band. actual measured times will vary with input source impedance, external input/output capacitance, and the slew rate of the input voltages. the bwr-5/6-3.3/7 series implements a soft start circuit that limits the duty cycle of the pwm controller at power up, thereby limiting the input inrush current. the on/off control to v out start-up time assumes the converter has its nominal input voltage applied but is turned off via the on/off control pin. the speci cation de nes the interval between the time at which the converter is turned on and the fully loaded output voltage enters and remains within its speci ed accuracy band. similar to the v in to v out start-up, the on/off control to v out start-up time is also governed by the internal soft start circuitry and external load capacitance. input overvoltage/undervoltage shutdown and start-up threshold under normal start-up conditions, devices will not begin to regulate until the ramping-up input voltage exceeds the start-up threshold voltage (35v for "d48" models). once operating, devices will not turn off until the input voltage drops below the undervoltage shutdown limit (34v for "d48" models). subsequent re-start will not occur until the input is brought back up to the start-up threshold. this built in hysteresis prevents any unstable on/off situations from occurring at a single input voltage. input voltages exceeding the input overvoltage shutdown speci cation listed in the performance/functional speci cations will cause the device to shut- down. a built-in hysteresis of 0.6 to 1.6 volts for all models will not allow the converter to restart until the input voltage is suf ciently reduced. on/off control the on/off control (pin 4) may be used for remote on/off operation. as shown in figure 1, the control pin is referenced to the ?nput (pin 2) and will be internally pulled to a high state. the standard bwr model (no suf x) is designed so that it is enabled when the control pin is left open and disabled when the control pin is pulled low (less than +0.8v relative to ?nput). dynamic control of the on/off function is best accomplished with a mechanical relay or an open-collector/open-drain circuit (optically isolated if appropriate). the drive circuit should be able to sink approximately 1 ma for logic low. the on/off control function is designed such that the converter can be disabled while the input power is ramping up, and then "released" once the input has stabilized. figure 1. internal circuitry for no suf x models 4 2 1 r a r b +input ?input on/off control d12 r a = 34.8k ? , r b = 6.83k ? d24 r a = 100k ? , r b = 9.74k ? d48 r a = 100k ? , r b = 4.53k ?
bwr models 33w, dual output, mixed-voltage dc/dc converters 5 sync function (optional) in critical applications employing multiple switching dc/dc converters, it may be necessary to synchronize the switching of selected converters. these bwr converters offer an optional sync function ("s" suf x) in place of the on/off control on pin 4. the sync pin will self con gure as either a slave or master, depending on the application. if the sync pin detects the appropriate input signal it will con gure itself as a slave, if no signal is detected it will generate master sync pulses. synchronization of converters requires that the master switching frequency exceed the slave frequency by a minimum of 60khz. at the start of each dc/dc converter switching cycle, an internally generated 160-360ns pulse will be present at the sync pin. if, however, the unit receives an external sync pulse, the dc/dc converters switching cycle will be reset, and a new cycle initiated. since the master frequency is higher than the slaves switching frequency, the slave cycles are always terminated prematurely, thereby never allowing internal synch pulses to be generated. the external signals rising edge initiates the slave sync process. external signals must adhere to min./ max. limits stated in performance/functional speci cations. operating these bwr converters at higher switching frequencies via the external sync function will result in a slight degradation of ef ciency. contact the datel for further information. current limiting when power demands from either output fall within 126% to 181% of the rated output current, the dc/dc converter will go into a current limiting mode. in this condition both output voltages will decrease proportionately with increases in output current, thereby maintaining a somewhat constant power dissipa- tion. this is commonly referred to as power limiting (see figures 2a and 2b). current limit inception is de ned as the point where the full-power output voltage falls below the speci ed tolerance. if the load current being drawn from the converter is signi cant enough, the unit will go into a short circuit condition. see "short circuit condition." short circuit condition when a converter is in current limit mode the output voltages will drop as the output current demand increases (see gures 2a and 2b). if the output volt- age drops too low, the magnetically coupled voltage used to develop primary side voltages will also drop, thereby shutting down the pwm controller. following a time-out period of 5 to 15 milliseconds, the pwm will restart, causing the output voltages to begin ramping to their appropriate values. if the short-circuit condition persists, another shutdown cycle will be initiated. this on/off cycling is referred to as "hiccup" mode. the hiccup cycling reduces the average output current, thereby preventing internal temperatures from rising to excessive levels. the bwr is capable of enduring an inde nite short circuit output condition. thermal shutdown these bwr converters are equipped with thermal shutdown circuitry. if the internal temperature of the dc/dc converter rises above the designed operating temperature, a precision temperature sensor will power down the unit. when the internal temperature decreases below the threshold of the temperature sensor the unit will self start. output overvoltage protection both output voltages are monitored for an overvoltage condition via magnetic coupling to the primary side. if either output voltage should rise to a level which could be damaging to the load circuitry, the sensing circuitry will power down the pwm controller causing the output voltages to decrease. following a time-out of 5 to 15 milliseconds the pwm will restart, causing the output voltages to ramp to their appropriate values. if the fault condition persists, and the output voltages again climb to excessive levels, the overvoltage circuitry will initiate another shutdown cycle. this on/off cycling is referred to as "hiccup" mode. figure 2a. current limiting characteristics for 3.3v output figure 2b. current limiting characteristics for 5v output 4 3 2 1 0 0 2 4 6 8 101214 3.3 v out average ouput current (amps) typical current limiting characteristics for 3.3v output ouput voltages (volts) v in nom, v in lo all models v in hi d12, d24 models v in hi d48 models 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 0123456789 5 v out average ouput current (amps) ouput voltages (volts) v in nom, v in lo all models v in hi d12, d24 models v in hi d48 models typical current limiting characteristics for 5v output (3.3v output @ 700ma)
33w, dual output, mixed-voltage dc/dc converters xwr series isolation / case connection the bwr 33 watt series?5v and 3.3v outputs (pins 5 & 7) and return (pin 6) are isolated from the +v in and ? in inputs (pins 1 & 2) via a transformer and an opto-coupled transistor. case connections are made internal to the dc/dc converter. "d12 & d24" cases are connected to ?nput (pin 2), "d48" to +input (pin 1). input reverse-polarity protection upon applying a reverse-polarity voltage to the dc/dc converter, an internal diode will be forward biased, drawing excessive current from the power source. therefore, it is required that the input current be limited be either an appropriately rated input fuse or a current limited power source. input fusing certain applications and/or safety agencies may require the installation of fuses at the inputs of power conversion components. fuses should also be used if the possibility of a sustained, non-current-limited, input-voltage polarity reversal exists. for datel bwr 33 watt series converters, slow blow fuses are recommended with values no greater than the following. v in range fuse value "d12" models 6 amps "d24" models 4 amps "d48" models 2 amps it is recommended that fuses be installed in the +input line. trimming output voltages these bwr converters have a trim capability (pin 8) that allow users to adjust the output voltages ?%. a trim adjustment will cause an equal percentage of change in both outputs. adjustments to the output voltages can be accomplished via a trim pot figure 3 or a single xed resistor as shown in figures 4 and 5. a single xed resistor can increase or decrease the output voltage depending on its connection. fixed resistors should be metal- lm types with absolute tcrs less than 100ppm/ c to minimize sensitivity to changes in temperature. a single resistor connected from the trim pin (pin 8) the +3.3v output (pin 7), see figure 4, will decrease the output voltages. a resistor connected from the trim pin (pin 8) to output return (pin 6) will increase the output voltages. table 1 shows the typical trim resistor values for output voltage changes of 1 through 5%. trim adjustment greater than 5% can have an adverse affect on the convert- ers performance and is not recommended. 20k ? 5-22 tu r n s +input +5v output +3.3v output trim output return ?input on/off control 1 2 4 5 8 6 +5v load +3.3v load 7 +input +5v output +3.3v output trim output return ?input on/off control 1 2 4 5 8 6 +5v load +3.3v load r trim down 7 +input +5v output +3.3v output trim output return ?input on/off control 1 2 4 5 8 6 +5v load +3.3v load r trim up 7 figure 5. increase output voltage trim connections using a fixed resistor figure 3. trim connections using a trimpot figure 4. decrease output voltage trim connections using a fixed resistor trim down trim up 0% ? 1% 201.5k 123.7k 2% 92.5k 55.3k 3% 56.1k 32.6k 4% 38k 21.2k 5% 27.1k 14.3k table 1. percentage of output voltage change vs trim resistor value (ohms) trim down ?13 down 3.3 ? v o r t (k ? ) = j e 3.55(v o ? 1.273) ?13 up 4.51 v o ? 3.3 j e r t (k ? ) = trim up note: accuracy of adjustment is subject to the tolerances of resistor values, reference accuracy and factory-adjusted output accuracy. v o = desired output voltage. 6
bwr models 33w, dual output, mixed-voltage dc/dc converters d12 model d12, d24, d48 models typical performance curves 7 d24 model d48 model input ripple current (v in = 18v, 5v @ 3a, 3.3v@ 4.5a, no external filtering, source impedance <0.1 ?. ) 50ma/div 1sec/div input ripple current (v in = 36v, 5v @ 3a, 3.3v@ 4.5a, no external filtering, source impedance <0.1 ?. ) 50ma/div 1sec/div input ripple current (v in = 75v, 5v @ 3a, 3.3v@ 4.5a, no external filtering, source impedance <0.1 ?. ) 50ma/div 1sec/div output ripple and noise (pard) ( v in = nominal, 5v@3a, 3.3v @ 4.5a, external 1f output capacitors.) 3.3v output ripple/noise 50mv/div 20mhz bw 5v output ripple/noise 50mv/div 20mhz bw 1sec/div output ripple and noise (pard) ( v in = nominal, 5v@0a, 3.3v @ 7a, external 1f output capacitors.) 3.3v output ripple/noise 50mv/div 20mhz bw 5v output ripple/noise 50mv/div 20mhz bw 1sec/div output ripple and noise (pard) ( v in = nominal, 5v@ 6a, 3.3v @ 0a, external 1f output capacitors.) 3.3v output ripple/noise 50mv/div 20mhz bw 5v output ripple/noise 50mv/div 20mhz bw 1sec/div
33w, dual output, mixed-voltage dc/dc converters xwr series 8 d12, d24, d48 models typical performance curves d12, d24, d48 models 5v output half-load to full-load transient response (v in = nominal, 3.3v@ 700ma, external 1f output capacitors.) 5v output 100mv/div output current 2a/div 100sec/div 6a 3a 5v output full-load to half-load transient response (v in = nominal, 3.3v@ 700ma, external 1f output capacitors.) 5v output 100mv/div output current 2a/div 100sec/div 6a 3a 3.3v output half-load to full-load transient response (v in = nominal, 5v@ 600ma, external 1f output capacitors.) 3.3v output 100mv/div output current 2a/div 100sec/div 7a 3.5a 3.3v output full-load to half-load transient response (v in = nominal, 5v@ 600ma, external 1f output capacitors.) 3.3v output 100mv/div output current 2a/div 100sec/div 3.5a 7a percentage of change on 3.3 v out (%) 5 volt output current (amps) cross regulation effects on +3.3v out (reference point 5v @ 3.9a, 3.3v @ 4a) 0.8 0.6 0.4 0.2 0 ?0.2 ?0.4 ?0.6 012345 6 3.3v @ 2a 3.3v @ 4a 3.3v @ 7a 3.3v @ 0a 3.3v @ 6a percentage of change in +5 v out (%) 3.3 volt current (amps) cross regulation effects on +5v out (reference point 5v @ 4a, 3.3v @ 3.9a) 4.0 3.0 2.0 1.0 0 ?1.0 ?2.0 ?3.0 ?4.0 01 23 45 67 5v @ 0a 5v @ 2a 5v @ 4a 5v @ 6a
bwr models 33w, dual output, mixed-voltage dc/dc converters 9 d12, d24, d48 models typical performance curves start-up from v in (v in = nominal, 5v@ 3a, 3.3v @ 4.5a, external 1f output capacitors.) 2msec/div 3.3v output 2v/div 5v output 2v/div v in start-up from remote on/off control (v in = nominal, 5v@ 3a, 3.3v @ 4.5a, external 1f output capacitors.) 2msec/div 3.3v output 2v/div 5v output 2v/div remote on/off (pin 4) d12, d24, d48 models d12 models d24, d48 models 90 85 80 75 70 65 60 d12 - 3.3 volt output efficiency vs. line and load (+5v @ 600ma) 0.70 1.40 2.10 2.80 3.50 4.20 4.90 5.60 6.30 7.00 +3.3v output current (amps) efficiency ( % ) v in = 18v v in = 12v v in = 10v 90 85 80 75 70 65 60 d12 - 5 volt output efficiency vs. line and load (+3.3v @ 700ma) 0.60 1.20 1.80 2.40 3.00 3.60 4.20 4.80 5.40 6.00 +5v output current (amps) efficiency ( % ) v in = 10v v in = 18v v in = 12v 95 90 85 80 75 70 65 60 55 50 d24/d48 - 3.3 volt output efficiency vs. line and load (+5v @ 600ma) 0 0.78 1.56 2.33 3.11 3.89 4.67 5.44 6.22 7.00 +3.3v output current (amps) efficiency ( % ) v in = max v in = nominal v in = min 95 90 85 80 75 70 65 60 55 50 d24/d48 - 5 volt output efficiency vs. line and load (+3.3v @ 700ma) 0 0.67 1.33 2.00 2.67 3.33 4.00 4.67 5.33 6.00 +5v output current (amps) efficiency ( % ) v in = max v in = nominal v in = min
33w, dual output, mixed-voltage dc/dc converters xwr series output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 loading (5v @ 1.98a, 3.3v @ 7a) loading (5v @ 3.74a, 3.3v @ 4.33a) loading (5v @ 5.1a, 3.3v @ 2.33a) loading (5v @ 6a, 3.3v @ 0.7a) output power vs. ambient temperature v in = 12v, natural convection air flow output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 loading (5v @ 1.98a, 3.3v @ 7a) loading (5v @ 3.74a, 3.3v @ 4.33a) loading (5v @ 5.1a, 3.3v @ 2.33a) loading (5v @ 6a, 3.3v @ 0.7a) output power vs. ambient temperature v in = 18v, natural convection air flow output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 natural convection air flowloading 150lfm air flow 300lfm air flow output power vs. ambient temperature v in = nominal, 5v @ 3.74a/3.3v @ 4.33a 10 temperature derating and electrical performace curves d24 models d12 models output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 loading (5v @ 1.98a, 3.3v @ 7a) loading (5v @ 3.74a, 3.3v @ 4.33a) loading (5v @ 5.1a, 3.3v @ 2.3a) loading (5v @ 6a, 3.3v @ 0.7a) output power vs. ambient temperature v in = 24v, natural convection air flow output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 loading (5v @ 1.98a, 3.3v @ 7a) loading (5v @ 3.74a, 3.3v @ 4.33a) loading (5v @ 5.1a, 3.3v @ 2.3a) loading (5v @ 6a, 3.3v @ 0.7a) output power vs. ambient temperature v in = 36v, natural convection air flow output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 natural convection air flowloading 150lfm air flow 300lfm air flow output power vs. ambient temperature v in = nominal, 5v @ 3.74a/3.3v @ 4.33a
bwr models 33w, dual output, mixed-voltage dc/dc converters datel makes no representation that the use of its products in the circuits described herein, or the use of other technical info rmation contained herein, will not infringe upon existing or future patent rights. the descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. speci? cations are subject to change without notice. the datel logo is a registered datel, inc. trademark. datel (uk) ltd. tadley, england tel: (01256)-880444 datel s.a.r.l. montigny le bretonneux, france tel: 01-34-60-01-01 datel gmbh mnchen, germany tel: 89-544334-0 datel kk tokyo, japan tel: 3-3779-1031, osaka tel: 6-6354-2025 datel, inc. 11 cabot boulevard, mans? eld, ma 02048-1151 tel: (508) 339-3000 (800) 233-2765 fax: (508) 339-6356 internet: www.datel.com email: sales@datel.com iso 9001 registered innovation and ex c ell e n c e ? ? ds-0481a 12/01 11 temperature derating and electrical performace curves d48 models d48 models output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 loading (5v @ 1.98a, 3.3v @ 7a) loading (5v @ 3.74a, 3.3v @ 4.33a) loading (5v @ 5.1a, 3.3v @ 2.33a) loading (5v @ 6a, 3.3v @ 0.7a) output power vs. ambient temperature v in = 48v, natural convection air flow output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 loading (5v @ 1.98a, 3.3v @ 7a) loading (5v @ 3.74a, 3.3v @ 4.33a) loading (5v @ 5.1a, 3.3v @ 2.33a) loading (5v @ 6a, 3.3v @ 0.7a) output power vs. ambient temperature v in = 75v, natural convection air flow output power (watts) ambient temperature ( ? c) ?400 15202530354045505560657075 80 85 90 95 100 35 30 25 20 15 10 5 0 natural convection air flowloading 150lfm air flow 300lfm air flow output power vs. ambient temperature v in = nominal, 5v @ 3.74a/3.3v @ 4.33a

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