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 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. features ? isolated ? output over voltage shutdown ? high efficiency ? over temperature protection ? fixed frequency (60 0 khz) ? scp/ocp ? high power de n sity ? basic insulation ? input under voltage lockout ? remote on/off ? low cost ? ? class 2 , category 2, isolated dc/dc converter (refer to ipc - 9592) ? ul60950 - 1 recognized (ul/cul) ( pending ) applications ? n etworking ? computers and peripherals ? telecommunications description the srsb - 50t12c is an isolated dc / dc converter that operate s from a nominal 48 v dc source. the unit will provide up to 60 w of output power from a nominal 48 v dc input. the unit is des igned to b e highly efficient and low cost . features include remote on/off, over current protection and under - voltage lockout. the converter is pr ovided in an industry standard sixteenth brick package. part selection output voltage input voltage max. outp ut current max. output power typical efficiency model number active low 12 vdc 36 v dc - 75 v dc 5 a 6 0 w 89 % srsb - 50t12c notes : add ?g? suffix at the end of the model number to indicate tray packaging. part number explanation s r sb ? 50 t 12 c 1 2 3 4 5 6 7 1 --- s urface m ount 2 --- rohs 6, change ? r ? to ? 7 ? means rohs 5 3 --- series name , 1/ 16 brick 4 --- s eries code 5 --- i nput range ( 36 - 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. s rsb - 50t 12 c rohs compliant preliminary 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 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. absolute maximum ratings parameter min typ max unit notes continuous input vol tage - 0.3 - 80 v input transient voltage - 0.3 - 100 v 100ms maximum remote on/off - 0.3 - 1 8 v i/o isolation voltage - - 150 0 v ambient temperature - 40 - 85 ? c storage temperature - 55 - 125 ? c note: ratings used beyond the maximum ratings may c ause a reliability degradation of the converter or may permanently damage the device. input specifications parameter min typ max unit notes operating input voltage 3 6 48 75 v input current (full load) - - 2 .4 a input current (no load) - 7 0 120 ma remote off input current - 1 3 ma input reflected ripple current ( rms) - 3 7 ma input reflected ripple current (pk - pk) - 2 0 50 ma with simulated source impedance of 15uh, 5hz to 20mhz ; u se a 100 uf/100v electrolytic capacitor with esr=1 ohm max, at 200khz@25c. i 2 t inrush current transient - 0.01 0.02 a 2 s turn - on voltage threshold 31 3 2 3 5 v turn - off voltage threshold 3 0 3 1 34 v note : all specificatio ns are typical at 25 ? c unless otherwise stated . output specifications parameter min typ ma x unit notes output voltage set point 11.75 12.00 12.25 v v in =48 v , io=50%load load regulation - 9 18 mv line regulation - 10 25 mv regulation over temperature ( - 40 deg.c - 85 deg.c) - 20 35 mv total regulation - 39 78 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 the minimum external tantalum cap at output. output current r ange 0 - 5 a output dc current limit 5.2 6.5 8.5 a
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 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. output specifications (continued) parameter min typ max unit notes short circuit surge transient - 0.5 1 a 2 s turn on time - 35 70 ms overshoot at turn on - 0 5 % output capacitance 22 - 470 uf transient response overshoot - 400 650 mv v 25 %~ 50 % of max load settling time - 150 300 us overshoot - 400 650 mv v 50 %~ 25 % of max load settling time vo= 12 v - 150 300 us di/dt=0.1a/us, vin=48vdc, ta=25c, with a 1f ceramic capacitor and the minimum external 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 86 89 - % v in =48 v, full load. switchin g frequency - 60 0 - khz over t emperature protection - 125 - 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 - tbd - g dimensions inches (l w h) millimeters (l w h) 1 .30 0 x 0.9 00 x 0.36 4 33.02 x 22.86 x 9.24 - 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 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. efficiency data 50% 55% 60% 65% 70% 75% 80% 85% 90% 0.5a 1.25a 2.5a 3.75a 5a output current (a) e f f i c i e n c y 36v 48v 75v thermal derating curve m aximum junction temperature of semiconductors derated to 120 degree c. derating curve under 48v input range
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 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. transient response waveforms 50% - 2 5% load transients at vin=48 v 2 5% - 50% load transients at vin=48 v note: transient response at vout=12v , di/dt=0.1a/us, external 22uf t antalum cap and 1uf ceramic cap, and ta=25 deg c. ripple and noise waveform 48 vdc input, 12 vdc/ 5 a output note: ripple and noise at full load, and with a 1uf ceramic cap and a 22 uf tantalum cap at output , ta=25 deg c.
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 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 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 2. 95 - 18 v the remote on/off pin open, unit o ff. 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 7 isolated dc/dc converters 3 6 vdc - 75 v dc input , 12 vdc / 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. mechanical outline note: this module is recommended and compatible with pb - fre e reflow soldering and must be soldered using a reflow profile with a peak temperature of no more than 260oc 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 pl ate . 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) . pi n connections pin# function 1 vin (+) 2 on/off 3 vin ( - ) 4 vout ( - ) 5 vout (+)
? 20 11 bel fuse inc. specifications subject to change without notice. 042 9 11 8 corporate far east europe bel fuse inc. bel fuse ltd. bel fuse europe ltd. 206 van vorst street 8f/ 8 lu k 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 3 6 vdc - 75 v dc input , 12 vdc/ 5 a out p ut apr . 2 9 , 20 11 bel power inc. , a subsidiary of bel fuse inc. revision history date version changes detail approval 2010 - 04 - 2 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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