50 ics 1-1-3 dc/dc converter ics parameter reference voltage te mperature coefficient of reference voltage efficiency oscillation frequency line regulation load regulation overcurrent protection starting current low level voltage ss pin outflow current at low voltage quiescent circuit current features ?compact full-mold package (equivalent to t o220) ?output current: 3.5 a ? high efficiency: 83% (vo = 5 v, v in = 15 v, io = 2 a) ?requires only 6 discrete components ?built-in reference oscillator (300 khz) ?built-in drooping-type overcurrent and thermal protection circuits ?built-in soft start circuit (output on/off available) applications ?dvd recorder, fpd-tv ?oa equipment, such as printers ?onboard local power supplies lineup part number vo (v) io (a) function si-8001ffe 7 b s j b c m f (0.8 to 24) 3.5 soft start unit v w w c c c/w c/w symbol v in p d1-1 p d1-2 p d2-1 p d2-2 t j t stg j-c j-a parameter input voltage power dissipation (with infinite heatsink) power dissipation (without heatsink) junction temperature *1 storage temperature thermal resistance (junction to case) thermal resistance (junction to ambient air) absolute maximum ratings conditions limited by thermal protection circuit, t j =150 c t j =125 c limited by thermal protection circuit, t jmax =150 c t j =125 c recommended operating conditions *: the minimum value of the input voltage range is 4.5 v or vo +3 v, whichever is higher. parameter input voltage range output voltage range output current range operating junction temperature range operating temperature range symbol v in v o i o t jop t op unit v v a c c ratings si-8001ffe v o+3 *1 to 40 0.8 to 24 0 to 3.5 ?0 to +125 ?0 to +85 *: this product has built-in thermal protection circuits that may activate when the junction temperature exceeds 130 c. the recommended design for the junction temperature during ic operation is below 125 c. ratings si-8001ffe 43 22.7 18.2 2.15 1.72 +150 ?0 to +150 5.5 58 symbol v adj conditions ? v adj / ? t conditions conditions fo conditions ? v oline conditions ? v oload conditions i s conditions v ssl i ssl conditions i q conditions i q(off) conditions electrical characteristics unit v mv/ c % khz mv mv a v a ma a (r1=4.2k ? , r2=0.8k ? when ta=25 c and vo=5v) ratings si-8001ffe min. typ. max. 0.784 0.800 0.816 v in =15v, io=0.2a 0.1 v in =15v, io=0.2a, tc=0 to 100 c 83 v in =15v, io=2a 270 300 330 v in =15v, io=2a 55 80 v in =10 to 30v, io=2a 15 50 v in =15v, io=0.2 to 3.5a 3.6 v in =15v 0.5 630 v in =15v, v ss =0v 6 v in =15v, io=0a 200 600 v in =15v, vss=0v *: pin 5 is the ss 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 vssl or lower. ss-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 c3 flows into the on/ off control transistor. therefore, limit the current securely to protect the transistor if c3 capacitance is large. the ss pin is pulled up (3.7 v typ.) to the power supply in the ic, so applying the external voltage is prohibited. if this pin is not used, leave it open. SI-8000FFE SI-8000FFE ss 5ss 5ss c3 c3 5 v o. on/off soft start soft start +vo. on/off SI-8000FFE full-mold, separate excitation step-down switching mode SI-8000FFE series
51 ics SI-8000FFE series external dimensions (to220f-5) (unit : mm) block diagram 4 3 gnd 2 in ss sw adj 1 5 preg. reset osc + comp. error amp. latch & drive tsd on/off soft start + + v ref ocp t ypical connection diagram c 1 :470 f c 2 :680 f c 3 :0.1 f (only when using soft-start function) l 1 :47 h d 1 :rk46 (sanken) in c 1 c 3 di l1 r1 r2 c 2 v in gnd ss gnd si-8001ffe sw i adj adj 12 4 3 5 + + v out gnd 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) (17.9) (2.0) 0.85 +0.2 ?.1 0.45 +0.2 ?.1 4.0 0.2 7.9 0.2 4.6 0.6 16.9 0.3 0.5 12345 p1.7 0.7 4=6.8 0.7 2.8 0.2 3.2 0.2 pin assignment q in w sw e gnd r adj t ss plastic mold package type flammability: ul 94v-0 product mass: approx. 2.3 g
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