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SC1408IMS.TR Datasheet(PDF) 6 Page - Semtech Corporation |
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SC1408IMS.TR Datasheet(HTML) 6 Page - Semtech Corporation |
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6 / 12 page  © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 LOW VOLTAGE, BOOST DC-DC CONTROLLER SC1408 August 22, 2000 6 Fig. 3: Achieving output voltages greater than 16.5V + C3 100uF 25V OUT Q1 IRL3103S L1 22uH D3 12V 3.3V IN D1 B130T + C8 100uF R4 10.0k U1 SC1408IS 8 1 2 3 4 5 6 7 ISENSE GATE BST FB SHDN REF AGND GND R2 0.05Ohm R6 470 C4 0.1uF R3 200k + C2 100uF D4 1N4148 C5 0.1uF Fig. 4: Implementing shutdown with input/output isolation R3 90k 3.3V IN U1 SC1408IS 8 1 2 3 4 5 6 7 ISENSE GATE BST FB SHDN REF AGND GND L1 22uH + C2 100uF + C3 100uF 12V OUT C5 0.1uF D1 B130T C4 0.1uF R2 0.05Ohm J1 1 2 R5 5.1k Q1 IRLL3303 SHORT = RUN OPEN = SHUTDOWN + C8 100uF R4 10.0k Q2 Si2301DS |
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