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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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. features ? isolated ? output over voltage shutdown ? fixed frequency (307 khz) ? over temperature protection ? high efficiency ? scp/ocp ? high power density ? remote on/off ? input under voltage lockout ? basic isolation ? input over voltage lockout ? baseplate ? low cost ? 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 0rqb-t0r12x is isolated dc/dc converter that operates from a nominal 24 vdc source. this unit will provide up to 240 w output power from a nominal 24 vdc input. these units are 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 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 12 vdc 18 vdc - 36 vdc 20 a 240 w 94.5% 0rqb-t0r120 0RQB-T0R12L notes: add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation 0 r qb ? t0 r 12 x 1 2 3 4 5 6 7 1---through hole 2---rohs 6, change ?r? to ?7? means rohs 5 3---series name, 1/4 brick 4---series code 5---input range 24v wide (18-36v) 6---output voltage (12v) 7---suffix 0rqb-t0r12x rohs com p liant rev.d
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. absolute maximum ratings parameter min typ max unit notes continuous input voltage -0.3 - 40 v non-operating input transient voltage - - 50 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 24 36 v input current (full load) - - 15.0 a input current (no load) - 180 200 ma remote off input current - 5 10 ma input reflected ripple current (rms) - 5 8 ma input reflected ripple current (pk-pk) - 15 25 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 - 0.05 0.1 a 2 s turn-on voltage threshold 16.0 16.8 17.5 v turn-off voltage threshold 15.5 16.5 17.0 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 25a on system board. refer to the fuse manufacture?s datasheet for further information. notes: 1. this converter has internal c-l-c (23.5uf) filter. 2. all specifications are typical at 25 c unless otherwise stated. output specifications parameter min typ max unit notes output voltage set point 11.76 12 12.24 v vin=24v, io=50% load load regulation - 20 30 mv line regulation - 10 15 mv regulation over temperature (-40deg.c-85deg.c) - 100 200 mv ripple and noise (pk-pk) - 100 120 mv ripple and noise (rms) - 25 40 mv vin=24v, full load, 0-20mhz bw, with a 1f ceramic capacitor and a 10uf tantalum cap at output. ripple and noise (pk-pk) under worst case - - 150 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. output specifications (continued) parameter min typ max unit notes output current range 0 - 20 a output dc current limit 22 26 30 a short circuit surge transient - - 5 a 2 s rise time 8 - 12 ms 25 35 ms enable form vin turn on time - 25 35 ms enable form on/off overshoot at turn on - 0 3 % output capacitance 0 - 5000 uf transient response overshoot - 300 400 mv v50%~75% of max load settling time - 120 200 us overshoot - 300 400 mv v75%~50% of max load settling time - 120 200 us di/dt=0.1a/us, vin=24vdc, ta=25c, with a 1f ceramic capacitor and a 10uf 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 94 94.5 - % vin=24v, full load switching frequency - 307 - khz over temperature protection - 125 130 c over voltage protection(static) - 14.15 14.5 v this voltage is achieved by trimming up output slowly weight - 75 - g fit 362.8 - calculated per bell core sr-332 (vin=24 v, vo=12 v, io=7 a, ta = 25 c, fit=109/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 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. thermal derating curve derating curve under normal input derating curve under worse case 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 5 isolated dc/dc converters 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. ripple and noise waveform note: ripple and noise at full load, and with a 1uf ceramic cap and a 10 uf tantalum cap at output and ta=25 deg c. transient response waveforms vout= 12v 50%-75% load transients vout= 12v 75%-50% load transients note: transient response at di/dt=0.1a/us, vin=24v, with 1uf ceramic cap and 10uf aluminum cap at output and ta=25 deg c. 24vdc input, 12vdc/20a
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. startup & shutdown rise time startup time vin = 24 v, full load startup from vin ch1: vo ch3: vin vin = 24 v, full load startup from on/off ch1: vo ch3: on/off vin = 24 v, full load
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. startup & shutdown (continued) shutdown efficiency data 80.00% 82.00% 84.00% 86.00% 88.00% 90.00% 92.00% 94.00% 96.00% 2.00 5.00 10.00 15.00 20.00 output current(a) efficiency 18 v 24 v 36 v vin = 24 v, full load
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 0RQB-T0R12L. the remote on/off pin open, unit off. signal low (unit off) -0.3 - 0.8 v signal high (unit on) active high 2.4 - 18 v 0rqb-t0r120. the remote on/off pin open, unit on. 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 remote 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary 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 sense (-) pin. the trim up resistor should be connected between the trim pin and the sense (+). only one of the resistors should be used for any given application. minimum trim down voltage is 10.8v maximum trim up voltage is 13.2v. 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=12.036v [] ? = k delta rtrimdown 22 . 10 511 module sense(+) trim sense(-) rtrimdown [] ? ? ? ? ? + = k delta vo delta rtrimup 22 . 10 225 . 1 626 11 . 5 ) 100 ( module sense(+) trim sense(-) rtrimup () [] % 100 _ ? = vo vo req vo delta 10.8 11.04 11.28 11.52 11.76 12 0 120 240 360 480 600 vo,adj (v) rtrim_dow n (kohm) 12 12.24 12.48 12.72 12.96 13.2 0 500 1000 1500 2000 2500 vo,adj (v) 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 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. 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 compens ation 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 limiti ng for a few mili-seconds. if the over current condition persists beyond a few milliseconds, the module will shut down into hiccup mode and restart once every 800ms. the module operates normally when the output current goes into specified range. the typical average output current is 0.02a during hiccup. 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 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. test setup: waveform: r = 249k vin = 24 v, load in cc mode ch1: output voltage ch3: output current expansion of on time portion vo+ vo- trim r k ch1: output voltage waveform ch2: input voltage waveform ch3: output current waveform
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. over temperature protection the otp is achieved by thermistor rt and the threshold is set at 120c in non-latch mode; the hottest component q5 reaches 120c with 200lfm 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 on the top side: q5 the thermistor on the bottom side: rt
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsidiary of bel fuse inc. input under-voltage lockout fundamental circuit diagram v1=16v v2=17v input voltage (v) i n put c u r r e n t voltage falling voltage rising v1 v2 under- voltage lockout control isolated feedback 1 2 3 8 4 7 5 6 choke capacitor resistor
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 capacitive filter setup: item designator parameter vendor vendor p/n 1 c1 1uf/100v/1210 murata grm32er72a105ka01l 2 c2 1uf/100v/1210 murata grm32er72a105ka01l 3 c3 0.1uf/100v/1206 tdk c3216x7r2a104k 4 c4 220 f/2000v, al cap nichicon uhe2a221mhd6 5 c5 0.1uf/1000v/2220 murata grm55dr73a104kw01l 6 c6 0.1uf/1000v/2220 murata grm55dr73a104kw01l 7 t1 0.809mh pulse p0429 c1 c2 c3 c4 c5 c6 l1 l1 vin+ vin- converter po si tiv e in p u t converter negative input
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 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com 17 isolated dc/dc converters 24 vdc input 12 vdc /20 a output sep. 11, 2010 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 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 (+) 0.04" 2 on/off 0.04" 3 vin (-) 0.04" 4 vout (-) 0.06" 5 rs- 0.04" 6 trim 0.04" 7 rs+ 0.04" 8 vout (+) 0.06"
? 2010 bel fuse inc. specifications subject to change without notice. 091110 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 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 24 vdc input 12 vdc /20 a output sep. 11, 2010 bel power inc., a subsid iary of bel fuse inc. revision history date revision changes detail approval 2008-07-22 pa first release xq han 2009-04-03 pb update mechanical drawing xq han 2009-10-29 pc update input current, no load input current, remoted off input current, input reflected ripple current, turn on voltage threshold, turn off voltage threshold, line regulation, output ripple and noise, output dc current limit, turn on time, transient respon se, efficiency, efficiency curve, switching frequency, over voltage protection and weight xf jiang 2010-09-11 d 1. change fixed frequency from 500khz to 307khz. 2. change max value of remote on/off from 12v to 18v; add input transient voltage in absolute maximum ratings. 3. update no load input current, remote off input current, input reflected ripple current in input specifications. 4. change typical value of pipple and noice(pk-pk) from 80mv to 100mv; update load regulation, line regulation, regulation over ambient temperature, turn on time, short circuit surge transient and transient response; add rise time, output dc current limit, ripple and noise(pk-pk) under worse case in output specifications. 5. change min value of efficiency from 93% to 94%; update switching frequency, over temperature protection, over voltage protection, isolation capacitance and fit; add input to case isolation voltage, output to case isolation voltage and isolation resistance in general specifications. 6. update td, nr, tr, efficiency data and output trim equations; add startup&shutdown, remote on/off, remote sense, ocp, ovp, otp, uvlo, fundamental circuit diagram, safety&emc and layout. xf jiang 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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