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SC2422 Datasheet(PDF) 4 Page - Semtech Corporation |
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SC2422 Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 10 page SC2422A BIPHASE CURRENT MODE CONTROLLER © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320 PRELIMINARY - August 7, 2000 4 PIN CONFIGURATION Top View (16-Pin SOIC) FUNCTIONAL BLOCK DIAGRAM PIN DESCRIPTION Pin 1: VID4 , MSB Pin 2: VID3 Pin 3: VID2 Pin 4: VID 1 Pin 5: VID0 , LSB Pin 6: ERROUT Error-amplifier output. Pin 7: FB Error-amplifier inverting input. Pin 8: RREF Frequency setting resistor pin. Also pro- grams the DAC current step size. (see application in- formation for programming the frequency) Pin 9: GND Chip ground. Pin 10: UVLO Programmable Under Voltage Lock- Out. This pin may be connected to the MOSFET driver supply through a voltage divider to inhibit the SC2422A until the drivers are on. The UVLO comparator trip point is 1.5V. Pin 11: OC- Input current sense, negative input. This pin is connected to the input supply side of the current sense resistor. Pin 12: OUT2 PWM output for phase 2. Drives exter- nal Power MOSFET driver. Pin 13: OUT1 PWM output for phase 1. Drives exter- nal Power MOSFET driver. Pin 14: OC+ Input current sense positive input. This pin is connected to MOSFET side of the current sense resistor. Pin 15: BGOUT Soft start and reference. Bypass to ground (GSEN) with a .022µF - 0.1µF capacitor to im- plement soft start in conjunction with internal 3K Ω re- sistor. To ensure output voltage accuracy, the maxi- mum current source/sink from this pin should be lim- ited to 0.5 uA. Pin 16: VCC Chip positive supply. |
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