Why MOSFETs Generate Heat

Many people think MOSFETs are either ON or OFF, so they should not generate much heat. In reality, they dissipate power during both conduction and switching.

When conducting, heat comes mainly from:

P = I² × Rds(on)

During switching, losses occur while the device transitions between states.

This is why MOSFET selection, gate driving, and PCB thermal design are all important parts of power electronics.

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