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bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.b elfuse.com 1 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. features ? isolated ? output over - voltage shutdown ? high efficiency ? output voltage trim ? high power density ? ocp/scp ? fixed frequency (25 0 khz) ? over temperature protection ? low cost ? remote on/off ? input under - voltage lockout ? positive/negative remote sense ? basic insulation ? class 1, category 2, isolated dc/dc converter (refer to ipc - 9592) ? tuv en609 50 - 1 recognized ( pending ) ? ul60950 - 1 recognized (ul/cul) ( pending ) applications ? networking ? computers and peripherals ? telecommunications description the 0rqb - t0t12x is an isolated dc / dc converter that operate s from a nominal 48 v dc source. this unit will provide up to 300 w of output power from a nominal 48 v dc 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 conver ter is provided in an industry standard quarter brick package. part selection output voltage input voltage max. output current max. output power typical efficiency model number active high model number active low 1 2 v dc 36 v dc - 75 v dc 2 5 a 30 0 w 95.5 % 0r qb - t0t12 0 0r qb - t0t12 l notes : add ?g? suffix at the end of the model number to indicate tray packaging. part number explan ation 0 r q b ? t0 t 12 0 1 2 3 4 5 6 7 1 --- through h ole 2 --- rohs 6, change ? r ? to ? 7 ? means rohs 5 3 --- series name, 1/ 4 brick 4 --- series code 5 --- input range 48 v wide (36 - 75v) 6 --- output v oltage 1 2v 7 --- remote sense, active high , change ? 0 ? to ? l ? means active low 0r qb - t0t12 x rohs compliant rev. c
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.b elfuse.com 2 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick march 27 , 2009 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 100 ms maximum remote on/off - 0.3 - 18 v i/o isolation voltage - - 15 00 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 permanently damage the device. input specifications parameter min typ max u nit notes operating input voltage 36 48 75 v input current (full load) - - 10 a input current (no load) - 100 - ma remote off input current - 10 - ma input reflected ripple current ( rms) - 15 - ma input reflected ripple current (pk - pk) - 50 - ma tested with simulated source impedance of 10 u h , 5 hz to 20 mhz ; use a 100 uf/100 v electrolytic capacitor with esr = 1 ohm max. at 200 k hz at 25 ? c . i 2 t inrush current transient - tbd - a 2 s turn - on voltage threshold - 34.5 3 5 .5 v turn - off vo ltage threshold 32.5 33.5 - 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 1 3a on system board. refer to the fuse manufacture ? s datasheet for further information. notes: 1. this converter has internal c - l - c (1uf - 1.0 u h - 1 5.4 u f) filter. 2. for recommended external input filter, please refer to s afety section (page 1 4 ). 3. all specificatio ns are typical at 25 ? c unless otherwise sta ted . output specifications parameter min typ max unit notes output voltage set point 11.760 12.004 12.240 v vin=48v, io=50% load load regulation - 30 6 0 mv line regulation - 12 24 mv regulation over temperature ( - 40deg.c - 85deg.c) - 6 0 10 0 mv ripple and noise (pk - pk) - 150 20 0 mv ripple and noise ( rms ) - 40 8 0 mv 0 - 20 mhz bw, with a 1f ceramic capacitor and a 10uf tantalum cap at output. ripple and noise (pk - pk) under worst case - - tbd mv over all operating input voltage , l oad and temperature conditions .
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.b elfuse.com 3 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. output specifications (continued) parameter min typ max unit notes output current range 0 - 25 a output dc current limit - 33 - a short circuit surge transient - tbd - a 2 s turn on time - 100 150 ms overshoot at turn on - 0 3 % output capacitance 0 - 56 00 uf transient response overshoot - - 40 0 mv v50 %~ 75 % of max load settling time - - 3 00 us overshoot - - 40 0 mv v75 %~ 50 % of max load settling time - - 3 00 us di/dt=0.1a/us, vin=48vdc, ta=25c, with a 1f ceramic capacitor an d a 10uf tantalum cap at the output. note : all specifications are typical at nominal input, full load at 25c unless otherwise stated . general spec ifications parameter min typ max unit notes efficiency - 95.5 - % vin=48v, full load switching frequency - 25 0 - khz output voltage trim range 90 - 105 % v o this voltage is achieved by trimming up output slowly over temperature protection - 125 - ? c over voltage protection(static) - 1 4 - v weight - 60 - g fit tbd - calculated per bell core s r - 332 ( vin=48 v, vo=12 v, io=20 a, t a = 25 ? c , fit=10 9 /mtbf) dimensions inches (l w h) millimeters (l w h) 2.30 x 1.45 x 0.50 58.42 x 36.83 x 12 .70 - isolation characteristics input to output - - 1500 v input to case - - 1500 v output to case - - 500 v isolation resistance 10m - ohm isolation c apacitance - 22 00 - pf note : all specifications are typical at 25 ? c unless otherwise sta ted.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201 - 432 - 0463 ? fax 201 - 432 - 9542 ? www.b elfuse.com 4 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. efficiency data 80.00% 82.00% 84.00% 86.00% 88.00% 90.00% 92.00% 94.00% 96.00% 98.00% 2.50 6.25 12.50 18.75 25.00 output current(a) e f f i c i e n c y 36 v 48 v 75 v thermal derating curve s m aximum 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.b elfuse.com 5 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. thermal derating curve s (continued) derating curve under normal input derating curve under worse case input tbd 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.b elfuse.com 6 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. ripple and noise wavef orm . 48 vdc in put, 12vdc/25a output note: ripple and noise at full load , ta=25c, with a 1f ceramic capacitor and a 10uf tantalum cap at the output. transient response waveform s 50% - 75% load transients 75 % - 50 % load transients note: transient response at di/dt=0.1a/us, ta=25c, with 1uf ceramic cap and 10uf aluminum 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 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. startup & shutdown rise time startup time s hutdown test condition: 48vdc input, 12vdc/25a output , and ta=25 deg c test condition: 48vdc input, 12vdc/25a output , and ta=25 deg c test condition: 48vdc input, 12vdc/25a output and ta=25 deg c test condition: 48vdc input, 12vdc/25a output and ta=25 deg c startup from vin ch1: vo ch 2 : vin startup from on/off ch1: vo ch 2 : 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 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary 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 0r qb - t0t12 l. the remote on/off pin op en, unit o ff . signal low (unit off) - 0.3 - 0 .8 v signal high (unit on) active high 2.4 - 18 v 0r qb - t0t12 0 . the remote on/off pin open, unit on. current sink 0 - 0.75 ma recommended remote on/off circuit for active low control with open collector/drain circuit contr ol with photocoupler circuit control with logic circuit permanently on recommended remo te on/off circuit for active 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 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 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. output trim equations equations for calculating the trim resistor are shown below. the trim dow n 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 10.8v maximum trim up voltage is 12.6v. the total voltage increased by trim and remote sense should not exceed 5% of the nominal output voltage. note: vo_req=desired (trimmed) output voltage [v] output voltage vo= 12.006 v ? ? ? ? % 100 _ ? ? ? vo vo req vo delta ] [ 1 _ _ ? ? ? ? k req vo vo req vo rtrimdown ? ? ? ? ? ? k req vo vo req vo rtrimup 1 _ _ module vout trim gnd rtrimdown module vout trim gnd rtrimup 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, 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 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 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 facilitates accu r ate voltage regulation at load terminals or other selected point. 1. the r emote 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 5 % of the nominal output voltage. 3. if the unit is already trimmed up, the available remote sen se compens ation range should be correspondingly reduced. the total voltage increased by trim and remote sense should not exceed 5 % 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+ ( 30.1 ohm) from vo+ to sense+ and a resistor rs - ( 30.1 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, 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 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. over c urrent 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 a nd restart once every 344ms. the module operates normally when the output current goes into specified range. the typical average output current is 0.3a during hiccup. ch1: output voltage waveform ch2: output current waveform and 1a/10mv test at: 48vdc input, over current output and ta=25 deg c 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 12 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. over v oltage 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 latch off mode. the overvoltage latch can be reset by either cycling the input power or toggling the on/off signal for one second at least . note: due to maximum duty cycle limt, output voltage can not be trimed up to ovp set point in low line input . test setup: r=10k ohm ch1: input voltage waveform ch2: output voltage 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 13 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. over temperature prot ection the otp is achieved by thermistor r25 and the threshold is set at 120c in non - latch mode; the hottest component q13 reaches 125c with 100lfm air flow correspondingly. it will restart automatically when the temperature falls down to 110c. the prot ecting point will be varied a little under different conditions (air flow, ambient temperature, input voltage, load...). the hottest component on the top side: q13 the thermistor on the bottom side: r25 inp ut u nder - voltage l ockout 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 v1=3 3.5 v v2=34 .5 v
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 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 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 b compliance to en55022 class b (both q.peak and average) with the following inductive and capacitive filter item designator parameter vendor vendor p/n 1 c1 2.2uf/100v,cerami c murata grf32er72a225ka11l 2 c2 2.2uf/100v,ceramic murata grf32er72a225ka11l 3 c3 2.2uf/100v,ceramic murata grf32er72a225ka11l 4 c4 270uf/100v,al cap nichicon uhe2a271mhd 5 c5 2200pf/2000v,ceramic johanson 202r29w222kv4e 6 c6 2200pf/2000v,ceramic joh anson 202r29w222kv4e 7 l1 0.809mh, common mode vac t60004 - l2025 - w622 8 l2 0.809mh, common mode vac t60004 - l2025 - w622 c 1 l 1 c 2 l 2 c 5 c 3 c 6 + - r module + - c 4
bel fuse inc. 206 van vorst 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 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. safety & emc (continued) positive negative
bel fuse inc. 206 van vorst 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 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. layout layout of compon ents on top side layout of components 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 17 isolated dc/dc converters 36 vdc - 75 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. mechanical outline note: this module is recommended and compatible with pb - free wave soldering and must be soldered u sing a peak solder temperature of no more 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 micro inches minimum nickel plate . 2 ) undimensioned components are shown for visual r eference 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 size 1 vin (+) 0.04" 2 on/off 0.04" 3 vin ( - ) 0.04" 4 vo ( - ) 0.0 6 " 5 sense ( - ) 0.0 4 " 6 trim 0.04" 7 sense (+) 0.04" 8 vo (+) 0.0 6 "
? 200 9 bel fuse inc. specifications subject to change without notice. 0 3 27 09 18 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 ci ty, 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 v dc input 1 2 vdc / 25 a output, 1/ 4 brick converter march 27 , 2009 bel power, inc. , a subsidiary of bel fuse, inc. labeling information t op view technical revisions - the appearance of products, including safety agency certifications and d.c. (date code) pictured on labels, may change depending on the date manufactured. packing in struction tbd revision history date version changes detail approval 2007 - 5 - 28 a first release 200 7 - 7 - 1 8 b update efficiency data curve and td curv e 2009 - 3 - 27 c 1. change to new format, includ e add ing application , part number explaining , r emote sense , ocp , ovp , otp , uvlo , s tartup& s hutdown , s afety&emc and so on. 2. add i nput t ransient v oltage , i nput c - l - c filter , r ecommended input fast - acting fuse o n system board . 3. update trim equations. 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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