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bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 1 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. features ? isolated ? output o ver - voltage s hut d own ? high efficiency ? over t emperature p rotection ? fixed frequency ? ocp/scp ? high power de n sity ? remote on/off ? low cost ? positive/negative r emote s ense ? input u nder - voltage l ockout ? basic i nsulation ? output v oltage t rim ? c las s 1, category 2, isolated dc/dc converter (refer to ipc - 9592) applications ? networking ? computers and peripherals ? telecommunications description the 0rsb - 40u12b series is isolated dc/dc converter that operate s from a nominal 24 v dc or 48 v dc source. these units will provide up to 42 w of output power from an 18 - 75 v dc wide input range. these units are designed to be highly efficient and low cost. features include remote on/off, over current protection and under voltage lockout. these converters are 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 12 vdc 18 v dc - 75 v dc 3.5 a 42 w 85 % 0rsb - 40u12b notes : add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation 0 r s b ? 40 u 12 b 1 2 3 4 5 6 7 1 --- through hole m ount 2 --- rohs 6, change ? r ? to ? 7 ? means rohs 5 3 --- series name , 1/16 brick 4 --- series code 5 --- i nput range ( 18 - 75 v) 6 --- output voltage ( 12 v) 7 --- option , ? x ? of the model part number to be 0 - 9, a - z, which will represent the special request of customer . 0 r s b - 40u 12 b rohs compliant preliminary rev. a
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 2 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary 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 100m s maximum remote on/off - 0.3 - 1 8 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 cause a reliability degradation of the converter or may perman ently damage the device. input specifications parameter min typ max unit notes operating input voltage 18 48 75 v input current (full load) - - 3.5 a input current (no load) - 60 120 ma remote off input current - 1 3 ma input reflected ripple cur rent ( rms) - 3 7 ma input reflected ripple current (pk - pk) - 20 50 ma with simulated source impedance of 1 5 uh, 5hz to 20mhz. use a 100uf/100v electrolytic capacitor with esr=1 ohm max, at 200khz@25c. i 2 t inrush current transient - 0.01 0.02 a 2 s inpu t over voltage lockout 78 - 82 v turn - on voltage threshold 16.6 17.2 17.8 v turn - off voltage threshold 16.2 16.8 17.4 v note : all specificatio ns are typical at 25 ? c unless otherwise stated . output specifications parameter min typ max unit notes output voltage set point 11.7 5 12 12.2 5 v vin=48v, io=50% load load regulation - 9 18 mv line regulation - 6 15 mv regulation over temperature ( - 40 deg.c - 85 deg.c) - 20 35 mv output ripple and noise (pk - pk) - 90 180 mv output ripple and noise ( rms ) - 30 55 mv 0 - 20mhz bw, with a 1f ceramic capacitor and a 10uf tantalum cap at output. output current range 0 - 3.5 a output dc current limit 3.7 5 6 a short circuit surge transien - 0.5 1 a 2 s hiccup mode, auto recovery turn on time - 25 50 ms
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 3 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. output specifications (continued) parameter min typ max unit notes overshoot at turn on - 0 5 % output capacitance 10 - 220 uf transient response overshoot - 4 00 6 5 0 mv v 25 %~ 50 % of max load settling time - 1 50 30 0 us overshoot - 4 00 6 5 0 mv v 50 %~ 25 % of max load settling time vo= 12 v - 1 50 30 0 us di/dt=0.1a/us, vin=48vdc, ta=25c, with a 1f ceramic capacitor and a 10uf tantalum cap at output. note : all specifications are typical at nominal input, full load at 25c unless otherwise stated . general specifications parameter min typ max unit notes efficiency 83 85 - % vin=48v, full load switching frequency - 5 00 - khz over t emperat ure protection - 1 25 - the otp threshold is set at 125 c in non - latch mode, and the module will restart automatically when temperature falls down to 115 c . over voltage protection(static) - 130 160 % this voltage is achieved by trimming up output slowly. weight - 14 - g di mensions inches (l w h) millimeters (l w h) 1.30 x 0.90 x 0. 4 6 33.02 x 22.86 x 1 1.69 - 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, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 4 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. efficiency data 50% 55% 60% 65% 70% 75% 80% 85% 90% 0.35 0.88 1.75 2.63 3.50 output current (a) e f f i c i e n c y 18v 24v 48v 75v remote on/off parameter min typ max unit notes signal low (unit o n ) - 0.3 - 0.8 v signal high (unit o ff ) active low 2.4 - 18 v r emote on/off pin open, unit o ff. current sin k 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, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 5 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. thermal derating curve maximum junction temperature of semiconductors derated to 1 20 degree c. v in=48 v v in =24 v
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 6 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. thermal derating curve (continued) the otp is ac hieved by thermistor r65 and it i s in non - latch mode when the hottest component q5 reaches 130 c with 10 0lfm air flow correspondingly. it will restart automatically when the temperature falls down to 110 c . the protecting point will be varied a little under different conditions (air flow, ambient temperature, input voltage, load...). ripple and noise waveform 48vdc input, 12 vdc output note: ripple and noise at full load , with a 1uf ceramic cap and a 1 0 uf tantalum cap at output , ta=25 deg c . temperature reference points on top side temperature reference points on bottom side
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 7 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. transient response waveforms vout= 12 v 25 % - 50 % load transients vout= 12 v 50 % - 25 % load transients note: transient response at vin=48v, di/dt=0.1a/us, with external 10uf tantalum cap and 1uf cer amic cap at the output , ta=25 deg c . startup & shutdown rise time s tartup time vin=48v, vo ut = 12 v, 100% load startup from vin ch1: vo ut ch 2 : vin vin=48v, vo ut = 12 v, 100% load
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 8 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. output trim equations equations for calculating the trim resistor are shown below. the trim down r esistor should be connected between the trim pin and ground pin . the trim up resistor should be connected between the trim pin and the vout . only one of the resistors should be used for any given application. note: vo_req=desired (trimmed) output voltage [v] output voltage vo= 12.00 7 v ? ? ? ? ? k delta rtrimdown 22 . 10 511 ? ? ? ? ? ? ? ? ? ? k delta vo delta rtrimup 22 . 10 225 . 1 626 11 . 5 ) 100 ( module vout trim gnd rtrimdown module vout trim gnd rtrimup ? ? ? ? % 100 _ ? ? ? vo vo req vo delta 9.8 10.02 10.24 10.46 10.68 10.9 11.12 11.34 11.56 11.78 12 0 40 80 120 160 200 240 280 320 360 400 adjusted output voltage vo,adj (v) t r i m r e s i s t o r v a l u e r t r i m _ d o w n ( k o h m ) 12 12.12 12.24 12.36 12.48 12.6 12.72 12.84 12.96 13.08 13.2 0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000 adjusted output voltage vo,adj(v) t r i m r e s i s t o r v a l u e , r t r i m _ u p ( k o h m )
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 9 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. remote sense this module has remote sense compens ation feature. it can minimize the effects of resistance between module?s output and load in system layout and facilitates acc urate 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 vol tage. 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 sens e 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 ceram ic 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 connect 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. s ee below figure. sense + sense - r s - v o - vo + r s + load sense + sense - r s - vo - v o + r s + load
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 10 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary 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 over current condition persi sts beyond a few milliseconds, the module will shut down into hiccup mode and restart once every 4 00ms. the module operates normally when the output curr ent goes into specified range. the typical average output current is 0.5 a during hiccup. input u nder - voltage l ockout vin=48v vin= 24 v v1= 16.8 v v2= 17.2 v input voltage ( v ) i n p u t c u r r e n t voltage falling voltage rising v 1 v 2 under - voltage lockout
bel fuse inc. 206 van vorst street, j ersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 11 isolated dc/dc converters 18 vdc - 75 v dc input , 12 vdc / 3 .5 a out p ut apr . 1 9 , 20 11 bel power, inc. , a subsidiary of bel fuse, inc. m e chani cal 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 th a n 5 seconds . note : 1 ) all pins: mater ial - copper alloy ; finish ? 3 micro inches minimum gold over 50 m icro 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 function di a. pin function dia. 1 vin(+) 0.04 ?? 5 sense( - ) 0.04 ?? 2 on/off 0.04 ?? 6 trim 0.04 ?? 3 vin( - ) 0.04 ?? 7 sense(+) 0.04 ?? 4 vout( - ) 0.062 ?? 8 vout(+) 0.062 ??
? 20 11 bel fuse inc. specifications subject to change without notice. 04 19 11 12 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 v dc input , 12 vdc/ 3 .5 a out p ut apr . 1 9 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. revision history date revis ion changes detail approval 201 1 - 0 4 - 1 9 p a first release jz wang rohs com p liance complies with the european directive 2002/95/ec, calling for the elimination of lead and other hazardous substances from electronic products.

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