46 ics 1-1-3 dc/dc converter ics lineup part number si-8033s si-8050s SI-8090S si-8120s si-8150s v o (v ) 3.3 5.0 9.0 12.0 15.0 i o (a) 3.0 absolute maximum ratings unit v w w c c v c/w ratings 43 * 18(with infinite heatsink) 1.5(without heatsink, stand-alone operation) +125 ?0 to +125 ? 5.5 symbol v in p d1 p d2 t j t stg v sw j-c parameter dc input voltage power dissipation junction temperature storage temperature sw terminal applied reverse voltage thermal resistance(junction to case) features compact full-mold package (equivalent to t o220) output current: 3.0a high efficiency: 79 to 91% requires only 4 discrete components internally-adjusted phase correction and output voltage built-in reference oscillator (60khz) built-in overcurrent and thermal protection circuits built-in soft start circuit (output on/off available) applications power supplies for telecommunication equip- ment onboard local power supplies *35v for si-8033s full-mold, separate excitation step-down switching mode si-8000s series recommended operating conditions parameter dc input voltage range output current range operating junction temperature range symbol v in i o t jop unit v a c ratings si-8033s si-8050s SI-8090S si-8120s si-8150s 5.5 to 28 7 to 40 12 to 40 15 to 40 18 to 40 0 to 3.0 ?0 to +125 electrical characteristics (t a =25 c) unit v % kh z mv mv mv/ c a v a parameter output voltage efficiency oscillation frequency line regulation load regulation t emperature coefficient of output voltage overcurrent protection starting current soft start pin* 2 symbol v o conditions conditions f conditions ? v oline conditions ? v oload conditions ? v o / ? t a i s1 conditions v ssl i ssl conditions si-8000s* 1 si-8000ss low-level voltage outflow current at low voltage *1:??may be printed to the right of the marking (except SI-8090S, si-8120s, si-8150s). *2:pin 5 is a soft start pin. soft start at power on can be performed with a capacitor connected to this pin. the output can also be turned on/off with this pin. the output is stopped by setting the voltage of this pin to v ssl or lower. soft-start pin voltage can be changed with an open-collector drive circuit of a transistor. when using both the soft-start and on/off functions together, the discharge current from c 3 flows into the on/off control transistor. therefore, limit the current securely to protect the transistor if c 3 capacitance is large. the on/off pin is pulled up to the power supply in the ic, so applying the external voltage is prohibited. if this pin is not used, leave it open. si-8000s si-8000s on/off 5 on/off 5 on/off c3 c3 5 v out. on/off soft start soft start +v out. on/off si-8000s ratings si-8033s si-8050s SI-8090S si-8120s si-8150s min. typ. max. min. typ. max. min. typ. max. min. typ. max. min. typ. max. 3.17 3.30 3.43 4.80 5.00 5.20 8.55 9.00 9.45 11.50 12.00 12.50 14.25 15.00 15.75 3.234 3.30 3.366 4.90 5.00 5.10 v in =15v, i o =1.0a v in =20v, i o =1.0a v in =21v, i o =1.0a v in =24v, i o =1.0a v in =25v, i o =1.0a 79 84 88 90 91 v in =15v, i o =1.0a v in =20v, i o =1.0a v in =21v, i o =1.0a v in =24v, i o =1.0a v in =25v, i o =1.0a 60 60 60 60 60 v in =15v, i o =1.0a v in =20v, i o =1.0a v in =21v, i o =1.0a v in =24v, i o =1.0a v in =25v, i o =1.0a 25 80 40 100 50 120 60 130 60 130 v in =8 to 28v, i o =1.0a v in =10 to 30v, i o =1.0a v in =15 to 30v, i o =1.0a v in =18 to 30v, i o =1.0a v in =21 to 30v, i o =1.0a 10 30 10 40 10 40 10 40 10 40 v in =15v, i o =0.5 to 1.5a v in =20v, i o =0.5 to 1.5a v in =21v, i o =0.5 to 1.5a v in =24v, i o =0.5 to 1.5a v in =25v, i o =0.5 to 1.5a 0.5 0.5 1.0 1.0 1.0 3.1 3.1 3.1 3.1 3.1 v in =15v v in =20v v in =21v v in =24v v in =25v v ssl =0.2v
47 ics si-8000s 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 current. therefore, obtain the value from the efficiency graph and substi- tute 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 0.5v(rk46) thermal design for d 1 must be considered separately. pin assignment q v in w sw out e gnd r v os t s.s plastic mold package type flammability: ul94v-0 product mass: approx. 2.3g forming no. 1101 10.0 0.2 4.2 0.2 0.95 0.15 8.2 0.7 2.6 0.1 3.9 0.7 (4.3) (4.6) (8.0) (17.9) (2.0) 0.85 +0.2 ?.1 0.45 +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 2.8 0.2 3.2 0.2 2 reg. ocp osc reset amp. tsd v ref comp. drive 1 4 v os v in sw out gnd s.s. 53 v in c 1 d 1 l 1 v in v o gnd s.s gnd gnd si-8000s sw out v os 1 2 3 + c 2 + 5 4 c 1,2 : 1000 f l 1 : 150 h d 1 : rk46(sanken) 15 20 10 5 0 ?5 0 25 50 operating ambient temperature t a ( c) power dissipation p d (w) 75 125 100 200 200 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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