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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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. features ? isolated ? output over-voltage shutdown ? high efficiency ? output voltage trim ? high power density ? ocp/scp ? fixed frequency (500 khz) ? over temperature protection ? low cost ? remote on/off ? input under-voltage lockout ? positive/negative remote sense ? basic insulation ? comply with ansi t1.315 ? class 1, category 2, isolated dc/dc converter (refer to ipc-9592) ? tuv en60950-1 recognized (pending) ? ul60950-1 recognized (ul/cul) (pending) applications ? networking ? computers and peripherals ? telecommunications description the 0RSB-40U03A is an isolated dc/dc converter that operates from a nominal 24 vdc or 48 vdc source. this unit will provide up to 33 w of output power from an 18-75 vdc wide input range. this unit is designed to be highly efficient and low cost. features include remote on/off, over current protection and under voltage lockout. this converter is provided in an industry standard sixteenth brick through hole package. part selection output voltage input voltage max. output current max. output power typical efficiency model number active low 3.3 vdc 18 vdc - 75 vdc 10 a 33 w 87.5% 0RSB-40U03A notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation 0 r sb ? 40 u 03 a 1 2 3 4 5 6 7 1---through hole 2---rohs 6, change ?r? to ?7? means rohs 5 3---series name, 1/16 brick 4---series code 5---input range 48v wide (18-75v) 6---output voltage 3.3v 7---option 0RSB-40U03A rohs com p liant rev. a
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. absolute maximum ratings parameter min typ max unit notes continuous input voltage -0.3 - 80 v input transient voltage - - 100 v 100 ms 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 18 48 75 v input current (full load) - - 3.0 a input current (no load) - 60 120 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 tested with simulated source impedance of 10 uh, 5 hz to 20 mhz; use a 100 uf/100 v electrolytic capacitor with esr = 1 ohm max. at 200 khz at 25 c. i 2 t inrush current transient - - 0.02 a 2 s turn-on voltage threshold 16.0 17.2 18.0 v turn-off voltage threshold 15.6 16.8 17.6 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 3a on system board. refer to the fuse manufacture?s datasheet for further information. note: all specifications are typical at 25 c unless otherwise stated. output specifications parameter min typ max unit notes output voltage set point 3.25 3.3 3.35 v vin=48v, 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 0-20 mhz bw, with a 1f ceramic capacitor and a 330uf tantalum cap at output. ripple and noise (pk-pk) under worst case - - 120 mv over all operating input voltage, load and temperature conditions.
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. output specifications (continued) parameter min typ max unit notes output current range 0 - 10 a output dc current limit 11 14 16 a short circuit surge transient - - 1 a 2 s rise time - 10 15 ms - 25 50 ms enable form vin turn on time - 25 50 ms enable form on/off overshoot at turn on - 0 5 % output capacitance 330 - 4700 uf transient response overshoot - 180 250 mv v50%~75% of max load settling time - 80 150 us overshoot - 180 250 mv v75%~50% of max load settling time - 80 150 us di/dt=0.1a/us, vin=48vdc, ta=25c, with a 1f ceramic capacitor and a 330uf tantalum cap at the 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 85 87.5 - % vin=48v, full load switching frequency - 500 - khz output voltage trim range 2.97 - 3.63 v over temperature protection - 125 130 c over voltage protection(static) - 4 4.9 v weight - 14 - g fit tbd - calculated per bell core sr-332 (vin=48 v, vo=3.3 v, io=8 a, t a = 25 c, fit=10 9 /mtbf) dimensions inches (l w h) millimeters (l w h) 1.30 x 0.90 x 0.46 33.02 x 22.86 x 11.69 - 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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. efficiency data 50% 55% 60% 65% 70% 75% 80% 85% 90% 12.557.510 output current (a) efficienc y 18v 24v 48v 75v thermal derating curves maximum junction temperature of semiconductors derated to 120 degree c. top view
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. thermal derating curves (continued) derating curve under 24vdc input derating curve under 48vdc input temperature reference points on top side temperature reference points on bottom side
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. ripple and noise waveform . 48 vdc input, 3.3vdc/10a output note: ripple and noise at full load, ta=25c, with a 1f ceramic capacitor and a 330uf tantalum cap at the output. transient response waveforms 75%-50% load transients 50%-75% load transients note: transient response at di/dt=0.1a/us, ta=25c, with 1uf ceramic cap and 330uf tantalum cap at output.
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary of bel fuse, inc. startup & shutdown rise time startup time shutdown test condition: 48vdc input, 3.3vdc/10a output, and ta=25 deg c test condition: 48vdc input, 3.3vdc/10a output, and ta=25 deg c test condition: 48vdc input, 3.3vdc/10a output and ta=25 de g c test condition: 48vdc input, 3.3vdc/10a output and ta=25 de g c startup from vin ch1: vo ch2: vin startup from on/off ch1: vo ch2: on/off
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary of bel fuse, inc. remote on/off parameter min typ max unit notes signal low (unit on) -0.3 - 0.8 v signal high (unit off) active low 2.4 - 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 9 isolated dc/dc converters 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary 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 10 isolated dc/dc converters 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary of bel fuse, inc. remote sense this module has remote sense compensation feature. it can minimizes the effects of resistance between moudle's output and load in system layout and facilitates accutate 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 incorpotated within the feedback loop of this module. the 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 11 isolated dc/dc converters 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary 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 400ms. the module operates normally when the output current goes into specified range. the typical average output current is 1a during hiccup. 48vin 24vin
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary of bel fuse, inc. over temperature protection the otp is achieved by thermistor r65 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 110c. the protecting point will be varied a little under different conditions (air flow, ambient temperature, input voltage, load...). the hottest component on the top side: q5 the thermistor on the bottom side: r65 input under-voltage lockout input voltage (v) i npu t c u r r en t voltage falling voltage rising v1 v2 under-voltage lockout v1=16.8v v2=17.2v
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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a subs idiary of bel fuse, inc. mechanical outline 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 size 1 vin (+) 0.040" 2 on/off 0.040" 3 vin (-) 0.040" 4 vo (-) 0.062" 5 sense (-) 0.040" 6 trim 0.040" 7 sense (+) 0.040" 8 vo (+) 0.062"
? 2009 bel fuse inc. specifications subject to change without notice. 112509 14 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 18 vdc - 75 vdc input 3.3 vdc /10 a output, 1/16 brick nove 25, 2009 bel power, inc. , a su bsidiary of bel fuse, inc. revision history date revision changes detail approval 2009-11-25 a first release jack fan 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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