32 ics 1-1-3 dc/dc converter ics features compact full-mold package (equivalent to t o220) high efficiency: 80% requires only 4 discrete components internally-adjusted phase correction and output voltage built-in reference oscillator (60khz) built-in overcurrent and thermal protection circuits applications power supplies for telecommunication equipment onboard local power supplies lineup part number si-8050e v o (v) 5.0 i o (a) 0.6 electrical characteristics unit v % kh z mv mv mv/ c a parameter output voltage efficiency oscillation frequency line regulation load regulation t emperature coefficient of output voltage overcurrent protection starting current symbol v o conditions conditions f conditions ? v oline conditions ? v oload conditions ? v o / ? t a i s1 conditions (t a =25 c) absolute maximum ratings unit v w w c c c/w c/w ratings 43 14(with infinite heatsink) 1.5(without heatsink, stand-alone operation) +125 ?0 to +125 7.0 66.7 symbol v in p d1 p d2 t j t stg j-c j-a parameter dc input voltage power dissipation junction temperature storage temperature thermal resistance(junction to case) thermal resistance(junction to ambient air) recommended operating conditions parameter dc input voltage range output current range operating junction temperature range operating temperature range symbol v in i o t jop t op unit v a c c ratings si-8050e 7 to 40 0 to 0.6 ?0 to +125 ?0 to +125 ratings si-8050e min. typ. max. 4.80 5.00 5.20 v in =20v, i o =0.3a 80 v in =20v, i o =0.3a 60 v in =20v, i o =0.3a 80 100 v in =10 to 30v, i o =0.3a 30 40 v in =20v, i o =0.1 to 0.4a 0.5 0.61 v in =10v full-mold, separate excitation step-down switching mode si-8000e series
33 ics si-8000e series external dimensions (to220f-5) (unit : mm) block diagram t ypical connection diagram t a -p d characteristics the efficiency depends on the input voltage and the output cur- rent. therefore, obtain the value from the efficiency graph and substitute the percentage in the formula above. v o : output voltage v in : input voltage i o : output current x: efficiency (%) v f : diode d 1 forward voltage 0.4v(ak06) thermal design for d 1 must be considered separately. forming no. 1101 pin assignment q v in w sw out e gnd r v os t n.c plastic mold package type flammability: ul94v-0 product mass: approx. 2.3g 10.0 0.2 0.95 0.15 0.85 +0.2 ?.1 4.0 0.2 7.9 0.2 16.9 0.3 0.5 12345 p1.7 0.7 4=6.8 0.7 4.2 0.2 8.2 0.7 2.6 0.1 3.9 0.7 (4.3) (4.6) (8.0) (17.9) (2.0) 0.45 +0.2 ?.1 2.8 0.2 3.2 0.2 sw out v os v in 3 gnd 5 n.c 4 2 1 osc reg. ocp comp. reset drive tsd amp. v ref v in c 1 d 1 l 1 5v : 200 h 100 f v in v o ak06 gnd nc gnd gnd si-8000e sw out v os 1 2 3 + c2 330 f + 5 4 (sanken) 15 10 5 0 ?0 02550 operating ambient temperature t a ( c) power dissipation p d (w) 75 100 125 200 200 2mm (2.3 c/w) 100 100 2mm (5.2 c/w) 75 75 2mm (7.6 c/w) infinite heatsink without heatsink with silicone grease heatsink: aluminum p d =v o ? o 100 ? ? f ? o 1? v o ? v in
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