P Channel Mosfet High Side Switch Circuit

It s a simple circuit that has a input for positive and negative and an output for positive and negative connections.

P channel mosfet high side switch circuit.

Negative voltage is fed into the gate terminal. The schematic for the p channel mosfet circuit we will build is shown below. Used as a high side switch a p channel mosfet in a totem pole arrangement with an n channel mosfet will simulate a high current high power cmos complementary mos arrangement. The p channel high side switch therefore solves the problem of using an n channel mosfet for high side switching.

P channel mosfets generally have a higher r dson compared to n type mosfets having a similar internal chip size. Consider the source as the input and the drain as the output. However this cure can also have some side effects. There are a variety of configurations for driving the two mosfets with many different applications.

Then the p channel mosfet is used to switch the positive supply to the motor for forward direction high side switching while the n channel mosfet is used to switch the negative supply to the motor for reverse direction low side switching. So this is the setup for pretty much any p channel mosfet circuit. Conversely if you are doing a low side switch pulls the load low or to ground an n channel device would be chosen. Achieving this streamlines the circuit and effectively lessens the all round cost.

P channel mosfet high side switch here s my schematic and board design for a simple high side switch using a p channel mosfet.