52 ics 1-1-3 dc/dc converter ics lineup part number SI-8008HFE si-8050hfe v o (v) variable (0.8 to 15) 5 i o (a) 5.5 absolute maximum ratings unit v w c c c/w c/w ratings 43 25 (with infinite heatsink) 20 (with infinite heatsink) 2.15 (without heat sink, standalone operation) 1.72 (without heatsink, standalone operation) +150 ?0 to +150 5 58 symbol v in p d1-1 p d1-2 p d2-1 p d2-2 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 features compact full-mold package (equivalent to t o220) output current: 5.5 a high efficiency: 83% typ. (at vo = 5 v) requires only 4 discrete components built-in reference oscillator (150 khz) built-in drooping-type-overcurrent and thermal protection circuits built-in soft start circuit (output on/off available) (t a =25 c) full-mold, separate excitation step-down switching mode si-8000hfe series applications onboard local power supplies ? a equipment conditions limited by thermal protection, t jmax =150 c t jmax =125 c limited by thermal protection, t jmax =150 c t jmax =125 c *: this product has built-in thermal protection circuits that may operate when the junction temperature rises above 130 c. the recommended design for the junction temperature during operation is below 125 c. 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-8008HFE si-8050hfe v o+3 *1 to 40 8 to 40 0.8 to 24 5.0 0 to 5.5 ?0 to +125 ?0 to +85 *1: the minimum value of an input voltage range is the higher of 4.5 v or v o + 3 v. electrical characteristics SI-8008HFE (at vo = 5 v) si-8050hfe min. 0.784 5.6 5.6 typ. 0.800 v in =15v, i o =1a max. 0.816 50 min. 4.90 typ. 5.00 v in =15v, i o =1a 0.5 v in =15v, i o =1a, t c =0 to 100 c 83 v in =15v, i o =3a max. 5.10 vo v adj ? v oload 0.1 v in =15v, i o =1a, t c =0 to 100 c 83 v in =15v, i o =3a ? vo/ ? t ? v adj / ? t 10 v ssl =0v 10 v ssl =0v 0.5 30 0.5 30 20 v in =15v, i o =0.2 to 5.5a 20 v in =15v, i o =0.2 to 5.5a 150 v in =15v, i o =3a 150 v in =15v, i o =3a fo 60 v in =10 to 30v, i o =3a 80 60 v in =10 to 30v, i o =3a 80 50 ? v oline 6 v in =15v, i o =0a 6 v in =15v, i o =0a v in =15v v in =15v i q 200 v in =15v, v ss =0v 200 v in =15v, v ss =0v 400 400 i q(off) low level voltage outflow current at low voltage v ssl i ssl i s v mv/ c % khz mv mv a v a ma a pa r ameter conditions conditions conditions conditions conditions conditions conditions conditions conditions conditions symbol unit ratings ratings output voltage reference voltage efficiency oscillation frequency line regulation quiescent circuit current load regulation overcurrent protection starting current on/off pin* t emperature coefficient of output voltage te mperature coefficient of reference voltage (t a =25 c) *: 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 cur- rent securely to protect the transistor if c3 capacitance is large. the ss pin is pulled up to the power supply in the ic, so applying the external voltage is prohibited. if the pin is not used, leave it open. si-8000hfe si-8000hfe ss 5ss 5ss c3 c3 5 v out. on/off soft start soft start +v out. on/off si-8000hfe
53 ics si-8000hfe series external dimensions (to220f-5) block diagram 4 3 gnd 2 in ss sw adj 1 5 preg. overcurrent protection reset osc + comp. error amp. latch & drive thermal protection on/off soft start + + SI-8008HFE reference voltage pin assignment q v in w sw e gnd r adj (v os for si-8050hfe) t ss plastic mold package type flammability: ul94v-0 product mass: approx. 2.3g (unit : mm) 4 3 gnd 2 in ss sw v os 1 5 preg. reset osc + on/off soft start + + si-8050hfe overcurrent protection comp. error amp. thermal protection reference voltage latch & drive t ypical connection diagram 4 3 gnd c3 c1 c4 + 2 in v in on/off sw adj + l di c2 1 5 preg. + + v out 4 3 gnd c3 2 in v in on/off sw adj + l di c2 1 5 preg. + + + v out c1 c4 + SI-8008HFE si-8050hfe r1 r2 c 1 : 1500 f c 2 : 1000 f c 3 :1 f (only when using soft-start function) c 4 :4.7 f (rper11h475k5 (murata manufacturing) recommended) l 1 :100 h di : fmb-g16l (sanken) 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
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