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bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 1 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. features ? isolated ? output over voltage shutdown ? high efficiency ? output voltage trim ? fixed frequency (600 khz) ? over temperature protection ? high power density ? scp/ocp ? input under voltage lockout ? basic insulation ? low cost ? remote on/off ? positive/negative remote sense ? class 1, category 2, isolated dc/dc converter (refer to ipc-9592) ? ul60950-1 recognized (ul/cul) (pending) applications ? networking ? computers and peripherals ? telecommunications description the XRSB-50T03C is an isolated dc/dc converter that operates from a nominal 48 vdc source. this unit will provide up to 50 w of output power from a nominal 48 vdc input. this unit is designed to be highly efficient and low cost. features include remote on/off, over current protection and under voltage lockout. the converter is provided in an industry standard sixteenth brick package. part selection output voltage input voltage max. output current max. output power typical efficiency model number active low 3.3 vdc 36 vdc - 75 vdc 15 a 50 w 89% XRSB-50T03C notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation x r sb ? 50 t 03 c 1 2 3 4 5 6 7 1---?x? can be ?0? or ?s?, ?0? mean through hole mount and ?s? mean surface mount 2---rohs 6, change ?r? to ?7? means rohs 5 3---series name, 1/16 brick 4---series code 5---input range (36-75v) 6---output voltage (3.3v) 7---suffix XRSB-50T03C rohs com p liant rev.b
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 2 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. absolute maximum ratings parameter min typ max unit notes continuous non-operating input voltage -0.3 - 80 v input transient voltage - - 100 v 100ms maximum remote on/off -0.3 - 18 v i/o isolation voltage - - 1500 v ambient temperature -40 - 85 c storage temperature -55 - 125 c note: ratings used beyond the maximum ratings may caus e a reliability degradation of the converter or may permanently damage the device. input specifications parameter min typ max unit notes operating input voltage 36 48 75 v input current (full load) - - 2 a input current (no load) - 70 120 ma remote off input current - 1 3 ma input reflected ripple current (rms) - 3 7 ma input reflected ripple current (pk-pk) - 20 50 ma with simulated source impedance of 10uh, 5hz to 20mhz; use a 100uf/100v electrolytic capacitor with esr=1 ohm max, at 200 khz. i 2 t inrush current transient - - 0.02 a 2 s turn-on voltage threshold - 32 35 v turn-off voltage threshold 30 31 - v caution: this converter is not internally fused. an input line fuse must be used in application. recommend a fast-acting fuse with maximum rating of 5a on system board. refer to the fuse manufacture?s datasheet for further information. notes: 1. this converter has internal l-c (1.0uh-1.0uf) filter. 2. all specifications are typical at 25 c unless otherwise stated. output specifications parameter min typ max unit notes output voltage set point 3.25 3.30 3.35 v v in =48 v, io=50%load load regulation - 4 9 mv line regulation - 3 8 mv regulation over temperature (-40deg.c-85deg.c) - 9 16 mv ripple and noise (pk-pk) - 55 90 mv ripple and noise (rms) - 12 25 mv 0-20mhz bw, with a 1f ceramic capacitor and the minimum external cap at output output ripple and noise(pk-pk) under worst case - - 100 mv over all operating input voltage, load and ambient temperature
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 3 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. output specifications (continued) parameter min typ max unit notes output current range 0 - 15 a output dc current limit 19 22 26 a short circuit surge transient - - 1 a 2 s rise time - - 15 ms - 35 70 ms enable form vin turn on time - 35 70 ms enable form on/off overshoot at turn on - 0 5 % output capacitance 3000 - 10000 uf transient response overshoot - 150 250 mv v 50%~75% of max load settling time - 120 200 us overshoot - 150 250 mv v 75%~50% of max load settling time vo= 3.3 v - 120 200 us di/dt=0.1a/us, vin=48vdc, ta=25c, with a 1f ceramic capacitor and the minimum external cap at output note: all specifications are typical at nominal inpu t, full load at 25c unless otherwise stated. general specifications parameter min typ max unit notes efficiency 86 89 - % v in =48 v, full load. switching frequency - 600 - khz over temperature protection - 120 140 over voltage protection (static) - 4.29 5.28 v weight - 13 - g fit tbd - calculated per bell core sr-332 (vin=48v, vo=3.3v, io=80%load, t a = 25 c, fit=10 9 /mtbf) dimensions inches (l w h) millimeters (l w h) 1.30 x 0.9 x 0.38 33.02 x 22.86 x 9.60 - 0rsb-50t03c dimensions inches (l w h) millimeters (l w h) 1.30 x 0.9 x 0.36 33.02 x 22.86 x 9.24 - srsb-50t03c isolation characteristics input to output - - 1500 v isolation resistance 10m - - ohm isolation capacitance - 3900 - pf note : all specifications are typical at 25 c unless otherwise stated.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 4 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. efficiency data 50.00% 55.00% 60.00% 65.00% 70.00% 75.00% 80.00% 85.00% 90.00% 1.5a 3.75a 7.5a 11.25a 15a output current(a) efficiency 36v 48v 75v thermal derating curve maximum junction temperature of semiconductors derated to 120 degree c.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 5 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. thermal derating curve (continued) temperature reference points on top side temperature reference points on bottom side ripple and noise waveform 48 vdc input, 3.3 vdc/15 a output note: ripple and noise at full load, and with a 1uf ceramic cap and a 3000 uf cap at output, ta=25 deg c.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 6 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. transient response waveforms 50%-75% load transients at vin=48 v 75%-50% load transients at vin=48 v note: transient response at di/dt=0.1a/us, with 1uf ceramic cap and 3000uf cap at output, and ta=25 deg c. remote on/off parameter min typ max unit notes signal low (unit on) -0.3 - 0.8 v signal high (unit off) active low 2.95 - 18 v the remote on/off pin open, unit off. current sink 0 - 1 ma recommended remote on/off circuit for active low control with open collector/drain circuit control with photocoupler circuit control with logic circuit permanently on vin+ vin- on/off vin+ vin- on/off vin+ vin- on/off vcc vin+ vin- on/off
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 7 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. output trim equations equations for calculating the trim resistor are shown below. the trim down resistor should be connected between the trim pin and gnd pin. the trim up resistor should be connected between the trim pin and the vout pin. only one of the resistors should be used for any given application. minimum trim down voltage is 2.97v maximum trim up voltage is 3.63v. the total voltage increased by trim and remote sense should not exceed 10% of the nominal output voltage. note: vo_req=desired (trimmed) output voltage [v] output voltage vo=3.308 v () [] % 100 _ ? = vo vo req vo delta module vout trim gnd rtrimdown module vout trim gnd rtrimup [] ? = k delta rtrimdown 22 . 10 511 [] ? ? ? ? ? + = k delta vo delta rtrimup 22 . 10 225 . 1 626 11 . 5 ) 100 ( 2.64 2.71 2.77 2.84 2.9 2.97 3.04 3.1 3.17 3.23 3.3 0 30 60 90 120 150 180 210 240 270 300 adjusted output voltage vo,adj (v) trim resistor value rtrim_down(kohm) 3.3 3.33 3.37 3.4 3.43 3.46 3.5 3.53 3.56 3.6 3.63 0 150 300 450 600 750 900 1050 1200 1350 1500 adjusted output voltage vo,adj(v) trim resistor value,rtrim_up(kohm)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 8 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. remote sense this module has remote sense compensation feature. it can minimize the effects of resistance between module?s output and load in system layout and facilitates accurate voltage regulation at load terminals or other selected point. 1. the remote sense lines carries very little current and hence do not require a large cross-sectional area. 2. this module compensates for a maximum drop of 10% of the nominal output voltage. 3. if the unit is already trimmed up, the available remote sense compensation range should be correspondingly reduced. the total voltage increased by trim and remote sense should not exceed 10% of the nominal output voltage. 4. when using remote sense compensation, all the resistance, parasitic inductance and capacitance of the system are incorporated within the feedback loop of this module. it can make an effect on the module's compensation, affecting the stability and dynamic response. a 0.1uf ceramic capacitor can be connected at the point of load to de-couple noise on the sense wires. 5. recommend the connection of remote sense compensation as below figure. there are a resistor rs+ (100 ohm) from vo+ to sense+ and a resistor rs- (51 ohm)) from vo- to sense- inside of this module. 6. if not using remote sense compensation, please connec t sense directly to output at module's pin, that is, connect sense+ to vo+ and sense- to vo- at module's pin, the shorter the better. see below figure. sense+ sense- rs- vo- vo+ rs+ load sense+ sense- rs- vo- vo+ rs + load
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 9 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. startup & shutdown rise time test condition: 48vin, 3.3v/15a startup time startup from vin startup from on/off ch1: vo, ch2: vin startup from on/off, ch2: vin test condition: 48vin, 3.3v/15a test condition: 48vin, 3.3v/15a shutdown test condition: 48vin, 3.3v/15a
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 10 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. over current protection to provide protection in a fault output overload condition, the module is equipped with internal current-limiting circuitry and can endure current limiting for a few mili-seconds. if the overcurrent condition persists beyond a few milliseconds, the module will shut down into hiccup mode and restart once every 300ms. the module operates normally when the output current goes into specified range. the typical average output current is 0.8a during hiccup. expansion of on time portion of above figure
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 11 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. over voltage protection the output overvoltage protection consists of circuitry that monitors the voltage on the output terminals. if the voltage on the output terminals exceeds the over voltage protection threshold, the module will shutdown into hiccup mode and restart once every 400ms. the module operates normally when the fault is cleared. test setup: r=100ohm ch1: output voltage waveform ch2: output current waveform vo+ vo- trim r k
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 12 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. over temperature protection the otp is achieved by thermistor u1 and the threshold is set at 120c in non-latch mode; the hottest component q5 reaches 130c with 100lfm air flow correspondingly. it will restart automatically when the temperature falls down to 100c. the protecting point will be varied a little under different conditions (air flow, ambient temperature, input voltage, load...). the hottest component q5 on top view thermistor u1 on bottom view under voltage lockout v1=31v v2=32v input voltage ( v) i n p u t c u r r e n t voltage falling voltage rising v1 v2 under- voltage lockout
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 13 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. mechanical outline 0rsb-50t03c note: this module is recommended and compatible with pb-free wave soldering and must be soldered using a peak solder temperature of no more than 26 0 oc for less than 5 seconds. note: 1) all pins: material - copper alloy; finish ? 3 micro inches minimum gold over 50 micro inches minimum nickel plate. 2) undimensioned components are shown for visual reference only. 3) all dimensions in inches (mm); tolerances: x.xx +/-0.0 2 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm). pin connections pin# function pin# function 1 vin (+) 5 rs (-) 2 on/off 6 trim 3 vin (-) 7 rs (+) 4 vo (-) 8 vo (+)
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 14 isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. mechanical outline (continued) srsb-50t03c note: this module is recommended and compatible with pb-free reflow soldering and must be soldered using a reflow profile with a peak temperature of no more than 260oc for less than 5 seconds. note: 1) all pins: material - copper alloy; finish ? 3 micro inches minimum gold over 50 micro inches minimum nickel plate. 2) undimensioned components are shown for visual reference only. 3) all dimensions in inches (mm); tolerances: x.xx +/-0.02 in. (x.x +/-0.5mm) x.xxx +/-0.010 in. (x.xx +/-0.25mm). pin connections pin# function pin# function 1 vin (+) 5 rs (-) 2 on/off 6 trim 3 vin (-) 7 rs (+) 4 vo (-) 8 vo (+)
? 2010 bel fuse inc. specifications subject to change without notice. 070910 15 corporate far east europe bel fuse inc. bel fuse ltd. bel fuse europe ltd. 206 van vorst street 8f/ 8 luk hop street preston technology management centre jersey city, nj 07302 san po kong marsh lane, suite g7, preston tel 201-432-0463 kowloon, hong kong lancashire, pr1 8ud, u.k. fax 201-432-9542 tel 852-2328-5515 tel 44-1772-556601 www.belfuse.com fax 852-2352-3706 fax 44-1772-888366 www.belfuse.com www.belfuse.com isolated dc/dc converters 36 vdc - 75 vdc input, 3.3 vdc/15 a output jul. 09, 2010 bel power inc., a subsid iary of bel fuse inc. revision history date version changes detail approval 2010-3-23 a first release jack fan 2010-7-9 b update the outline drawing of 0rsb-50t03c jz wang rohs compliance complies with the european directive 2002/95/ec , calling for the elimin ation of lead and other hazardous substances from electronic products.

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