I've seen N channel MOSFETs as high side switches of H bridges quite often, which requires a charge pump to drive. Wouldn't a P channel MOSFET be easier, simply isolating the microcontroller command from the gate source voltage? Why use the N channels instead then?
Electronic – Why use a N channel MOSFET as high side H bridge switches
- Electronic – High and Low Side Driver vs. Half-Bridge Driver
- Electronic – Using p-channel mosfet on high side of h-bridge, do I really need a driver chip
- Electronic – Severe ringing when high side MOSFET in half bridge circuit switches on
- Electronic – High side P channel MOSFET power switch – gate question, and suggestions for the circuit
- Electronic – Boost converter for high side Mosfet
- Electrical – Driving an N-Channel MOSFET H-Bridge from a voltage doubler
- Electronic – Why do the P-channel MOSFETs keep dying in this H-bridge
- Electrical – How to this driver power a high-Side MOSFET
P-channel MOSFETs tend to have a higher Rds(on), making them less efficient (for the same price). For a small H-bridge, the simplicity of using them makes them practical
However, for high power applications, the extra complexity of driving N channel FETs can be justified by improved efficiency from lower Rds(on).