16 ics 1-1-3 dc/dc converter ics lineup absolute maximum ratings unit v a w c c c/w c/w ratings 43 1.5 3 +125 ?0 to +125 3 33.3 symbol v in i o p d t j t stg j-c j-a parameter dc input voltage output current power dissipation * junction temperature storage temperature thermal resistance (junction to case) thermal resistance (junction to ambient air) part number si-8033jd si-8050jd SI-8090JD si-8120jd v o (v ) 3.3 5.0 9.0 12.0 i o (a) 1.5 recommended operating conditions parameter dc input voltage range dc output current range * operating junction temperature range operating temperature range* symbol v in1 v in2 i o t jop t op conditions i o =0 to 1a i o =0 to 1.5a v in v o +3v ratings si-8033jd si-8050jd SI-8090JD si-8120jd 5.3 to 40 7 to 40 11 to 40 14 to 40 6.3 to 40 8 to 40 12 to 40 15 to 40 0 to 1.5 ?0 to +125 ?0 to +125 features surface-mount package (to263-5) output current: 1.5a high efficiency: 77 to 88% requires only 4 discrete components internally-adjusted phase correction and output voltage capable of downsizing a choke-coil due to ic's high switching frequency (125 khz). (com- pared with conventional sanken devices) built-in foldback-overcurrent and thermal protection circuits output on/off available (circuit current at output off: 200 a max) soft start available by on/off pin conditions conditions when mounted on glass-epoxy board 40 40 mm (copper area 100%) when mounted on glass-epoxy board 40 40 mm (copper area 100%) *: limited by thermal protection circuit unit v a c c *: limited by ta? d characteristics *: pin 5 is the on/off 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. on/off-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. si-8000jd si-8000jd on/off 5 on/off 5 on/off c3 c3 5 v out. on/off soft start soft start +v out. on/off si-8000jd electrical characteristics unit v % kh z mv mv mv/ c a v a ma a parameter output voltage efficiency oscillation frequency line regulation load regulation te mperature coefficient of output voltage overcurrent protection starting current on/off * low level voltage pin outflow current at low voltage quiescent circuit current 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 i q conditions i q(off) conditions (t a =25 c) surface-mount, separate excitation step-down switching mode si-8000jd series applications power supplies for telecommunication equipment onboard local power supplies, etc. ratings si-8033jd si-8050jd SI-8090JD si-8120jd min. typ. max. min. typ. max. min. typ. max. min. typ. max. 3.234 3.30 3.366 4.90 5.00 5.10 8.82 9.00 9.18 11.76 12.00 12.24 v in =15v, i o =0.5a v in =20v, i o =0.5a v in =21v, i o =0.5a v in =24v, i o =0.5a 77 82 86 88 v in =15v, i o =0.5a v in =20v, i o =0.5a v in =21v, i o =0.5a v in =24v, i o =0.5a 125 125 125 125 v in =15v, i o =0.5a v in =20v, i o =0.5a v in =21v, i o =0.5a v in =24v, i o =0.5a 25 80 40 100 50 120 60 130 v in =8 to 30v, i o =0.5a v in =10 to 30v, i o =0.5a v in =15 to 30v, i o =0.5a v in =18 to 30v, i o =0.5a 10 30 10 40 10 40 10 40 v in =15v, i o =0.2 to 0.8a v in =20v, i o =0.2 to 0.8a v in =21v, i o =0.2 to 0.8a v in =24v, i o =0.2 to 0.8a 0.5 0.5 1.0 1.0 1.6 1.6 1.6 1.6 v in =15v v in =20v v in =21v v in =24v 0.5 0.5 0.5 0.5 100 100 100 100 v ssl =0v 7777 v in =15v, io=0a v in =20v, io=0a v in =21v, io=0a v in =24v, io=0a 200 200 200 200 v in =15v, v on/off =0.3v v in =20v, v on/off =0.3v v in =21v, v on/off =0.3v v in =24v, v on/off =0.3v
17 ics si-8000jd series external dimensions (to263-5) (unit : mm) pin assignment q v in w sw out e gnd r v os t on/off plastic mold package type flammability: 94v-0 product mass: approx. 1.48g 15.30 0.3 (6.8) 9.2 0.2 4.9 0.2 (1.75) (2 r0.45) (1.7 0.25 ) (1.7 0.25 ) 0.8 0.1 10.0 0.2 (4.4) (8.0) (0.40) 2.54 0.3 (4.6) 9.2 0.2 1.2 0.2 4.9 0.2 (0.75) 2.0 0.1 15.3 0.3 9.9 0.2 case temperature measurement point (15 ) (0.5) 2-r0.3 10.0 0.02 3-r0.3 (r0.3) (r0.3) 0.88 0.10 1.5 dp: 0.2 (1.7 0.25 ) 12345 (1.7 0.25 ) 0.8 0.1 4.5 0.2 1.3 0.10 0.15 2.4 0.2 +0.10 ?.05 (3 ) (3 ) (3 ) (3 ) (3 ) 0 to 6 block diagram t ypical connection diagram 4 3 gnd 2 v in on/off sw out 1 5 preg. ocp reset osc + comp. error amp. latch & drive tsd on/off soft start v ref + v in c 1 c 3 di l1 c 2 v in gnd on/off gnd si-8000jd sw out v os 12 4 3 5 + + v out gnd c 1: 50v/220 f c 2: 25v/470 f c 3: 10v/0.47 f (only when using soft-start function) l 1: 100 h di : sjpb-h6 (sanken) reference data copper laminate area on glass epoxy board vs. thermal resistance (junction to ambient air) (typical value) output current vs. power dissipation (typical) 55 50 45 40 35 30 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 200 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 400 600 800 1000 copper laminate area (mm 2 ) output current i o (a) v in 8v 20v 30v 40v thermal resistance (junction to ambient air) j-a ( c/w ) power dissipation pd (w) 1200 1400 1600 1800 with glass epoxy board of 40 40 mm 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 substitute the percentage in the formula above. v o :out put voltage v in : input voltage i o : output current ? : efficiency (%) v f :d 1 forward voltage 0.4v(i o =2a)(sjpb-h6) thermal design for d 1 must be considered separately. 3.5 3 2.5 2 1.5 1 0.5 0 ?5 0 25 50 75 100 125 power dissipation p d (w) ambient temperature t a ( c) copper area 40 40 mm ( j-a : 33.3 c/w) 20 40 mm ( j-a : 37 c/w) 20 20 mm ( j-a :44 c/w) 10 10 mm ( j-a : 53 c/w) p d =v o ? o 100 ? ? f ? o 1? v o ? v in
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