Micro-Cap Tutorial: MOSFET Gate-Source Overvoltage Clamping (Zener Diode) скачать в хорошем качестве

Micro-Cap Tutorial: MOSFET Gate-Source Overvoltage Clamping (Zener Diode)

How to add a clamping function to protect the gate-source junction of a MOSFET. We use a lowside N-Channel MOSFET (NMOS) and a zener diode with a specific breakdown voltage to demonstrate how to clamp. You can't really talk about zener clamping in a simulation without talking about current limitation. So, a current limiting resistor should be added in series with the gate to prevent the zener and the driver from competing/bickering over charge build-up. Otherwise, in the simulation, the source voltage will overdrive the zener with a large current and usurp the voltage level. We also look at an overvoltage condition of a hundred volts to see if the zener diode is doing it's job.