Micro-Cap Tutorial: MOSFET Default Conditioning Pullup Highside PMOS

How to create an explicit default condition for a highside MOSFET (PMOS)! It's pretty easy...just add a pullup resistor from the gate to the source of the PMOS device.

Adding the pullup resistor makes the default condition OFF for the MOSFET until you want to turn the device ON (allowing current through the load).

The energy cost of adding default conditioning function is increasing waste/leakage current from the supply voltage through the driver (technically, sinking the charge in this case).

I recommend staying somewhere in between ten kilo-ohm to one hundred kilo-ohm for values on default pull-up resistors. Otherwise, the depletion of charge from the gate can promote an opportunity for potential difference between the source terminal of the MOSFET...that would promote inadvertent turn ON and anti-function the default conditioning function.

Видео Micro-Cap Tutorial: MOSFET Default Conditioning Pullup Highside PMOS канала Micro-Cap Tutorials