bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com isolated dc/dc converters 48 vdc input 12 vdc/8.5 a output, 1/16 brick ? isolated ? input under voltage lockout ? fixed frequency ? input over voltage shutdown ? high efficiency ? ocp/scp ? high power density ? over temperature protection ? low cost ? remote on/off description the srca-08s12l is an isolated dc/dc converter that operates from a nominal 48 vdc source. these converters use a half bridge power train to provide isolation and step down. these units will provide up to 100 w of output power from a nominal 48 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. 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 v 36 v - 55 v 8.5 a 100 w 95% srca-08s12l notes: 1. add ?g? suffix at the end of the model number to indicate tray packaging. 2. all part numbers above indicate rohs 6. change the second letter "r" to "7" for rohs 5 part numbers. absolute maximum ratings parameter min typ max notes input voltage (continuous) -0.3 v - 80 v remote on/off -0.3 v - 18 v i/o isolation voltage - 500 v - ambient temperature -40 c - 85 c storage temperature -40 c - 125 c input specifications parameter min typ max notes input voltage 36 v - 55 v input current (full load) - - 2.5 a input current (no load) - - 120 ma remote off input current - 4 ma 10 ma active low input reflected ripple current (pk-pk) - 40 ma 100 ma input reflected ripple current (rms) - 10 ma 30 ma tested with simulated source impedance of 10 uh, 5 hz to 20 mhz; use a 100 uf/100 v electrolytic capacitor and 1 uf/100 v ceramic capacitor at the input. i 2 t inrush current transient - 0.039 a 2 s 0.062 a 2 s input over voltage protection threshold - 59 v - turn on voltage threshold - 35 v - turn off voltage threshold - 30 v - srca-08s12l rohs com p liant rev.b
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com isolated dc/dc converters 48 vdc input 12 vdc/8.5 a output, 1/16 brick output specifications parameter min typ max notes output voltage set point vin=36 v vin=48 v vin=55 v 8.8 v 11.8 v 13.5 v 9 v 12 v 13.75 v 9.2 v 12.2 v 13.95 v lout=no load line regulation - 4.75 v 5.0 v load regulation vin=36 v vin=48 v vin=55 v - - - 0.6 v 0.6 v 0.6 v 0.8 v 0.8 v 0.8 v regulation over temperature (-40 c to +85 c) - 100 mv 200 mv output current 0 a - 8.5 a current limit threshold 9 a - 14 a short circuit surge transient - 1.3 a 2 s 2.1 a 2 s ripple and noise (rms) - 30 mv 60 mv ripple and noise (pk-pk) - 90 mv 150 mv test conditions: 0-20 mhz bw, with a 1 uf ceramic capacitor and a 10 uf tantalum capacitor at the output; vin=48 v. turn on time - 10 ms 20 ms overshoot at turn on - 0% 3% output capacitance 0 uf - 2000 uf transient response overshoot - 150 mv 350 mv 50% ~ 75% max load settling time - 30 us 100 us overshoot - 150 mv 350 mv 75% ~ 50% max load settling time vin=48v - 30 us 100 us test conditions: di/dt = 0.5 a/us, vin=48 v note: all specifications are typical at 25 c unless otherwise stated. general specifications parameter min typ max notes efficiency 93% 95% - vin=48v, io=io,max switching frequency 160 khz 190 khz 220 khz isolation capacitance - 1500 pf - over temperature protection - 115 c - average pcb temperature will not exceed 115 c. mtbf 3,008,073 hours calculated per bell core sr-332 (i o =80% full load; vo=12 v; t a = 25 c) dimensions inches (l w h) millimeters (l w h) 1.3 x 0.9 x 0.4 33.0 x 22.9 x 10.2 weight - 14.5 g - 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 isolated dc/dc converters 48 vdc input 12 vdc/8.5 a output, 1/16 brick control specifications parameter min typ max notes remote on/off signal low (unit on) -0.3 v - 0.8 v signal high (unit off) active low 2.4 v - 18 v srca-08s12l. the remote on/off pin open, unit off. efficiency data 75.00% 80.00% 85.00% 90.00% 95.00% 100.00% 0.00 2.00 4.00 6.00 8.00 output current (a) efficiency 36 v 48 v 55 v thermal derating curve note: derating curve is tested at nominal input voltage.
bel fuse inc. 206 van vorst street, jersey city, nj 07302 ? tel 201-432-0463 ? fax 201-432-9542 ? www.belfuse.com isolated dc/dc converters 48 vdc input 12 vdc/8.5 a output, 1/16 brick ripple and noise waveform note: ripple and noise at full load, 48 v input and ta=25 deg c, and with a 10 uf tantalum capacitor and 1 uf ceramic capacitor on output. transient response waveforms 50% to 75% transient at 48 v input 75% to 50% load transient at 48 v input note: transient response at di/dt=0.5 a/us, ta=25 deg c.
? 2008 bel fuse inc. specifications subject to change without notice. 121808 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 48 vdc input 12 vdc/8.5 a output, 1/16 brick mechanical outline rohs compliance complies with the european directive 2002/95/ec , calling for the elimin ation of lead and other hazardous substances from electronic products. pin connections pin function 1 vin+ 2 remote on/off 3 vin- 4 vout- 5 vout+
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