P channel mosfets generally have a higher r dson compared to n type mosfets having a similar internal chip size.
P channel mosfet high side switch circuit.
The p channel high side switch therefore solves the problem of using an n channel mosfet for high side switching.
There are a variety of configurations for driving the two mosfets with many different applications.
Conversely if you are doing a low side switch pulls the load low or to ground an n channel device would be chosen.
P channel mosfet high side switch here s my schematic and board design for a simple high side switch using a p channel mosfet.
However this cure can also have some side effects.
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.
It s a simple circuit that has a input for positive and negative and an output for positive and negative connections.
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.
Achieving this streamlines the circuit and effectively lessens the all round cost.
If you are doing a high side switch pulls the load high or positive to turn it on a p channel device would be chosen.
Consider the source as the input and the drain as the output.
The schematic for the p channel mosfet circuit we will build is shown below.
Negative voltage is fed into the gate terminal.