High-Side MOSFET Circuit
P-Channel MOSFET
High-Side MOSFET circuits must be switched with a P-Channel MOSFET, which can be controlled by an N-Channel MOSFET:
When the N-Channel gate is pulled LOW
, it's off, and nothing flows through it. When the gate is pulled HIGH
, then electrons are allowed to flow from GND
to the P-Channel gate, and it turns on, in turn, energizing the load.