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SG3527AN Datasheet(PDF) 6 Page - Microsemi Corporation |
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SG3527AN Datasheet(HTML) 6 Page - Microsemi Corporation |
6 / 7 page SG1525A/SG1527A SERIES 11/91 Rev 1.3 10/96 LINFINITY Microelectronics Inc. Copyright © 1996 11861 Western Avenue ∞ ∞ ∞ ∞ ∞ Garden Grove, CA 92841 6 (714) 898-8121 ∞ ∞ ∞ ∞ ∞ FAX: (714) 893-2570 APPLICATION INFORMATION (continued) SHUTDOWN OPTIONS 1. Use an external transistor or open-collector comparator to pull down on the Comp terminal. This will set the PWM latch turning off both outputs. If the shutdown signal is momentary, pulse- by-pulse protection can be accomplished as the PWM latch will be reset with each clock pulse. 2. The same results can be accomplished by pulling down on the Soft-Start terminal with the difference that on this pin, shutdown will not affect the amplifier compensation network but must discharge any Soft-Start capacitor. 3. Apply a positive-going signal to the Shutdown terminal. This will provide most rapid shutdown of the outputs but will not immediately set the PWM latch if there is a Soft-Start capacitor. This capacitor will discharge but with a current of approxi- mately twice the charging current. 4. The shutdown terminal can be used to set the PWM latch on a pulse-by-pulse basis if there is no external capacitance on Soft-Start terminal. Slow turn-on may still be accomplished by applying an external capacitor, blocking diode, and charging resistor to the comp terminal. (See SG1524 Application Note). SG1525A/1527A LAB TEST FIXTURE |
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