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SI-3000KS Datasheet(PDF) 2 Page - Sanken electric |
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SI-3000KS Datasheet(HTML) 2 Page - Sanken electric |
2 / 6 page 15 ICs SI-3000KS Series ■External Dimensions (SOP8) (Unit : mm) 0.995max. 0.10 1.27 0.4±0.1 0.4±0.1 0.15+0.1 5.1±0.4 1.27 8765 1234 –0.05 0.12 M Pin Assignment q VC w VIN e VO r Sence (ADJ for SI-3012KS) t GND y GND u GND i GND Plastic Mold Package Type Flammability: UL 94V-0 Product Mass: Approx. 0.1 g ■Block Diagram ■Typical Connection Diagram ●SI-3012KS ●SI-3025KS, SI-3033KS ●SI-3012KS ●SI-3025KS, SI-3033KS R1, R2: Output voltage setting resistors The output voltage can be set by connecting R1 and R2 as shown above. The recommended value of R2 is 24 k Ω . R1=(VO–VADJ) ÷(VADJ/R2) 2 VIN 1 REF VC VOUT ADJ GND 4 8 7 6 5 3 TSD - + 2 VIN 1 REF VC VOUT Sense GND 4 8 7 6 5 3 TSD - + GND 5 to 8 VIN CIN R1 R2 2 VO CO 3 VC 1 ADJ 4 + Load GND 5 to 8 VIN CIN R2 2 VO CO 3 VC 1 sense 4 Load CIN: Input capacitor (22 µF or larger) CO: Output capacitor (22 µF or larger) For SI-3000KS series, Co has to be a low ESR capacitor. When using the electrolytic capacitor, the SI-3000KS series may oscillate at a low temperature. ■Reference Data Copper Laminate Area vs. Thermal Resistance Copper Laminate Area vs. Power Dissipation • Obtaining the junction temperature Measure the temperature TL at the lead part of the GND pin (pin 7) with a thermocouple, etc. Then, substitute this value in the following formula to obtain the junction temperature. Tj=PD × θj–L + TL ( θj–L = 22°C/W) Copper laminate area (mm2) (GND terminal) 10 100 140 120 100 80 60 40 1000 Area of PC board : 40 ×40mm 10 100 1.2 1 0.8 0.6 0.4 0.2 0 1000 Tj=100 °C Area of PC board : 40×40mm Ta=25 °C Ta=50 °C Ta=80 °C Copper laminate area (mm2) (GND terminal) |
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