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bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 1 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. features ? isolated ? remote on/off logic (optional) ? high efficiency ? input under v oltage protection ? fixed frequency ( 400 khz) ? output over voltage protection ? high power de n sity ? ocp/scp ? low cost ? over t emperature p rotection ? class 2 , category 2, isolated dc/dc converter (refer to ipc - 9592) ? ul60950 - 1 recognized (ul/cul) ( pending ) application s ? networking ? computers and peripherals ? telecommunications description the 0reb - 8 0t12x is an isolated dc / dc converter that operates from a nominal 48 v dc source. this converter provides up to 8 0 w of output power. features include remote on/off, short circuit protection, over current protection, over - temperature protection, output over - voltage protection, input under - voltage protection. these converters are provided in an industry standard eighth brick package. part selection output voltage input vo ltage max. output current max. output power typical efficiency model number active low model number active high 12 vdc 36 v dc - 75 v dc 6.5 a 8 0 w 9 3 % 0r e b - 8 0t 12 l 0re b - 8 0t 120 notes : add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation 0 r e b ? 8 0 t 12 x 1 2 3 4 5 6 7 1 --- through hole m ount 2 --- rohs 6, chang e ? r ? to ? 7 ? means rohs 5 3 --- series name 4 --- series code 5 --- i nput range ( 36 - 75 v) 6 --- output voltage ( 12 v) 7 --- enable , ? 0 ? means active high , and ? l ? means active low 0 r e b - 8 0t 12 x rohs compliant final rev. c
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 2 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. absolute maximum ratings parameter min typ max unit notes continuous non - operating input voltage - 0.3 - 75 v input transient voltage - - 100 v 100ms 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 rating s may cause 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. 4 a input current (no load) - 5 0 1 0 0 ma remote off input current - 10 1 5 ma input reflected ripple current ( rms) - 2 4 ma input reflected ripple current (p k - pk) - 10 2 0 ma with simulated source impedance of 10uh, 5hz to 20mhz. use a 100uf/100v electrolytic capacitor with esr=1 ohm max, at 200khz@25c. i 2 t inrush current transient - - 1 a 2 s turn - on voltage threshold 3 3 34 35 v turn - off voltage threshold 30 3 1 3 3 v caution: this converter is not internally fused. an input line fuse must be used in application . r ecommend a fast - acting fuse with maximum rating of 3 a on system board. refer to the fuse manufacture ? s datasheet for further information. notes: 1. this converter has internal c - l - c (0.47uf - 2.2u h - 3.2 u f) filter. 2. all specificatio ns are typical at 25 ? c unles s otherwise stated . output specifications parameter min typ max unit notes output voltage set point 11.76 12 12.24 v vin=48v, io=50% load load regulation - 0 . 2 0. 5 % vo,set vin=48v, io=0~100% load line regulation - 0. 2 0. 5 % vo,set vin=36 ~75v,io=100% load regulation over temperature ( - 40 deg.c - 85 deg.c) - - 0.02 % vo,set /c ripple and noise (pk - pk) - 30 50 mv ripple and noise ( rms ) - 5 1 5 mv vin=48v, io=100%load at 25 ? c ambient, 0 - 20mhz b w, with a 1f ceramic capacitor , 10uf tantalum cap and a 220uf electrolytic cap at output. ripple and noise (pk - pk) under worst case - - 60 mv over all operating input voltage, load and ambient temperature condition
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 3 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. outp ut specifications (continued) parameter min typ max unit notes output current range 0 - 6.5 a output dc current limit 7 8.5 10 a short circuit surge transient - - 0. 05 a 2 s rise time - - 1 5 ms - 2 5 30 ms enable form vin turn on time - 2 5 30 ms en able form on/off overshoot at turn on - 0 3 % output capacitance 220 - 3 000 uf transient response overshoot - 200 2 5 0 mv v 50 %~ 75 % of max load settling time - 600 7 50 us overshoot - 200 2 5 0 mv v 75 %~ 50 % of max load settling time vo= 12 v - 600 7 50 us di/dt=0.1a/us, vin=48vdc, ta=25c, with a 1f ceramic capacitor , 10uf tantalum cap and a 220uf el ectrolytic cap at output. note : all specifications are typical at nominal input, full load at 25c unless otherwise stated . general specifica tions parameter min typ max unit notes efficiency 90 9 3 - % vin=48v, full load switching frequency - 400 - khz output voltage trim range 80 - 110 % over t emperature protection - 1 1 0 1 2 0 over voltage protection(static) 1 3.8 - 1 5 v this voltage is achieved by trimming up output slowly. over voltage protection (dynamic) - - 18 v the transient over voltage is achieved by connecting the trim pin to vout+ pin through a 1 00 k resistor. weight - 18 - g fit 2 525 - calculated per bell core s r - 332 ( vin= 48v, vo=12v, io=5.2a, t a = 25 ? c , fit=10 9 /mtbf) dimensions inches (l w h) millimeters (l w h) 2.30 x 0.90 x 0. 40 58.42 x 22.86 x 10.20 - isolation characteristics input to output 1500 - - v isolation resistance 10m - - ohm isolation capac itance - 3900 - pf note : all specifications are typical at 25 ? c unless otherwise stated.
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 4 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. efficiency data 80% 82% 84% 86% 88% 90% 92% 94% 1.625a 3.25a 4.875a 6.5a output current (amp) e f f i c i e n c y ( % ) 36v 48v 75
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 5 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. 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 1.8 - 18 v the remote on/off pin open, unit o ff. signal low (unit o ff ) - 0.3 - 0.8 v signal high (unit o n ) active high 1.8 - 18 v the remote on/off pin open, unit o n. 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 recommended remo te on/off circuit for a ctive high 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 vin + vin - on / off vin + vin - on / off vin + vin - on / off vcc vin + vin - on / off
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 6 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. output trim equa tions equations for calculating the trim resistor are shown below. the trim down resistor should be connected between the trim pin and sense ( - ) pin. the trim up resistor should be connected between the trim pin and the sense (+). only one of the resistor s should be used for any given application. m inimum trim down voltage is 9.6 v maximum trim up voltage is 13.2 v. the total voltage increased by trim and remote sense should not exceed 10 % of the nominal output voltage. note: vo_re q=desired (trimmed) output voltage [v] output voltage vo= 12.000 v ? ? ? ? ? k delta rtrimdown 22 . 10 511 vout +sense -sense gnd trim rtrim_down ? ? ? ? ? ? ? ? ? ? k delta vo delta rtrimup 22 . 10 225 . 1 626 11 . 5 ) 100 ( vout +sense -sense gnd trim rtrim_up ? ? ? ? % 100 _ ? ? ? vo vo req vo delta 9.6 9.84 10.08 10.32 10.56 10.8 11.04 11.28 11.52 11.76 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 vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 7 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary 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 sys tem layout and facilitat es accu r ate 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 outp ut voltage. 3. if the unit is already trimmed up, the available remote sen se 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 remot e 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 0.1 uf 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+ ( 40.2 ohm) from vo+ to sense+ and a resistor rs - ( 40.2 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 vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 8 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 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 co ndition persists beyond a few milliseconds, the module will shut down into hiccup mode and restart once every 3 00ms. the module operates normally when the output current goes into specified range. the typical average output current is 1.75 a during hiccup . over voltage protection the output over voltage 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 w ill shutdown into hiccup mode and restart once every 3 00ms. the module operates normally when the fault is cleared. test setup: w aveform : ch1: output voltage waveform r = 1 00 k vin=48v expansion of on time portion vo + vo - trim r k sense + sense - trim r k
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 9 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. over temperature protection the otp is achieved by thermistor r 67 and the threshold is set at 110c in non - latch mode; the hottest component q 3 reaches 112c with 100lfm air flow correspondingly. it will restart automatically when the temperatur e falls down to 10 5 c. the protecting point will be varied a little under different conditions (air flow, ambient temperature, input voltage, load...). input u nder - voltage l ockout v1=3 1 v v2=34v 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 vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 10 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. ripple and noise waveform 48vdc input, 12 vdc/ 6.5 a output note: ripple and noise at full load, with a 1uf ceramic cap and a 1 0 uf tantalum cap and a 220uf electrolytic cap at output , ta=25 deg c . transient response waveforms vout= 12 v 50% - 75% lo ad transients vout= 12 v 75% - 50% load transients note: transient response at vin=48v, di/dt=0.1a/us, with a 1uf ceramic cap and a 10uf aluminum cap and a 220uf electrolytic cap at the output.
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 11 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. startup & shutdown rise time vin=48v, vo= 12 v, io= 6.5 a s tartup time startup from vin ch1: vo ch3: vin vin=48v, vo= 12 v, io= 6. 5a startup from on/off ch1: vo ch3: on/off vin=48v, vo= 12 v, io= 6. 5 a
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 12 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. startup & shutdown (continued) s hutdown vin=48v, vo= 12 v, io= 6. 5 a thermal derating curve maximum junction temperature of semiconductors derated to 120 d egree c. derating curve under normal input
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 13 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. thermal derating curve (continued) temperature referenc e points on top side temperature reference points on bottom side
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 14 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. safety & emc safety 1. material flammability ul94v - 0 2. tuv certification en60950 - 1 3. ul certification ul60950 - 1 emc 1. surge iec61000 - 4 - 5 2. dc - dip iec61000 - 4 - 29 3. conductive emi en55022 class a compliance to en55022 class a (both q.peak and average) with the following inductive and c apacitive filter setup: item designator parameter vendor vendor p/n 1 c1 1uf/100v,ceramic murata grm32er72a105ka01l 2 c2 0.1uf/100v, ceramic tdk c3216x7r2a104k 3 c3 100uf/100v, al cap nichicon uvz2a101mpd 4 c4 22nf/1000v,ceramic johanso n 631s41w223kv4e 5 c5 22nf/1000v,ceramic johanson 631s41w223kv4e 6 t1 1.3mh, common mode pulse p0402nl conv.positive input conv.negative input c 1 c2 c3 t1 t1 +vin - vin c 4 c 5
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 15 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. layout layout of components on top side layout of components on bottom side
bel fuse inc. 206 van vors t street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.belfuse.com 16 isolated dc/dc converters 36 vdc - 75 v dc input , 12 vdc / 6.5 a out p ut sep . 1 3 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. mechanical outline note: 1. pin 5 must be connected to vout( - ) 2. pin 7 must be connected to vout(+) note: this module is recommended and compatible with pb - free wave soldering and must be soldered using a peak solder temperature of no m ore than 26 0 oc for less th a n 5 seconds . note : 1 ) all pins: material - 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 in ches (mm) ; tolerances: x.xx +/ - 0.02 in. (x.x +/ - 0.5mm) x.xxx +/ - 0.010 in. (x.xx +/ - 0.25mm) . pin function dia. 1 vin(+) 0.04 ?? 2 rc 0.04 ?? 3 vin( - ) 0.04 ?? 4 vout( - ) 0.062 ?? 5 rs - 0.04 ?? 6 trim 0.04 ?? 7 rs+ 0.04 ?? 8 vout(+) 0.062 ?? .
? 20 11 bel fuse inc. specifications subject to change without notice. 091311 17 cor porate 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 l ancashire, 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 v dc input , 12 vdc/ 6.5 a out p ut output converter sep . 13 , 20 1 1 bel power, inc. , a subsidiary of bel fuse, inc. revision history date revis ion changes detail approval 2010 - 09 - 11 p a first release xf jiang 2010 - 11 - 15 pb 1. updated turn - on/off voltage threshold in inp ut specifications. 2. updated load regulation, line regulation, output ripple and noise, output dc current limit, turn on time, output capacitance, transient response in output specifications 3. updated remote on/off. xf jiang 2011 - 09 - 13 pc 1 output specs : output dc current limit ,output capacitance, settling time of transient response output ripple and noise(rms) 2 thermal derating curve xf jiang rohs com p liance complies with the european directive 2002/95/ec, calling for the eliminati on of lead and other hazardous substances from electronic products.

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