Simple, Latched Overcurrent Fault Detector Has Fast Response Time
The circuit introduced in this application note is a simple, fast-responding overcurrent detector designed to protect low-voltage applications. Unlike dedicated hot-swap controllers that impose a long start-up delay initiated by undervoltage, this circuit provides protection only 150 µs after the input supply rises above 2.7V. Additionally, a limited gate voltage on an external p-channel switch provides a measure of in-rush current limiting during power up.
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