How to Build an P-Channel MOSFET Switch Circuit So, this is the setup for pretty much any P-Channel MOSFET Circuit. Negative voltage is fed into the gate terminal. For an IRF9640 MOSFET, -3V at the gate is more than sufficient to switch the MOSFET on so that it conducts across from the source to the drain. Analysis of MOSFET as a Switch with Circuit Diagram If you understood the working of the MOSFET and its regions of operation, you would have probably guessed how a MOSFET works as a switch. We will understand the operation of a MOSFET as a switch by considering a simple example circuit. This is a simple circuit where a n-Channel Enhancement mode MOSFET will turn ON or OFF a light. MOSFET as a Switch - Using Power MOSFET Switching P-channel MOSFET Switch. Thus far we have looked at the N-channel MOSFET as a switch were the MOSFET is placed between the load and the ground. This also allows for the MOSFET’s gate drive or switching signal to be referenced to ground (low-side switching). P-Channel MOSFET Tutorial with only Positive Voltages For that matter, the first circuit drawings that describe the negative Vgs (using only a positive supply) for a P-channel MOSFET are drawn using N-channel MOSFETs. Based on the circuit, it looks like it is a ‘typo’ where the arrow is pointing the wrong way (for a P-channel MOSFET).
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