Reverse Polarity Protection

219

03:22:47

This trick using a P channel mosfet is a common way to provide reverse polarity protection on a power supply input.  It avoids the voltage drop problem of using a diode, with just the resistance of the mosfet to consider.

published 8 years ago

hurz

8 years ago

Yes, but 24V Vgs is propably to high for most Mosfets.

gasboss775

4 years ago

I don't understand why current doesn't pass through the mosfet's body diode when the input is reversed. Interestingly the body diode conducts when the gate is connected to the source. There's probably something really simple I'm missing, but I've never been able to understand this circuit.

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