We are doing low power SMPS’s with microcontrollers supplying the PWM to the FETs.
Switching frequency = 100KHz.
The problem is that micrcontrollers often experience a “stuck pin”, where a PWM pin sticks low or high.
Obviously the watchdog will catch this, but if a pin gets “stuck high”, then the FET will be stuck ON and we will experience an overcurrent which will blow up the FET before the watchdog can respond.
Do you have any stock circuits that can detect a “stuck high” PWM pin and pull it low?
Switching frequency = 100KHz.
The problem is that micrcontrollers often experience a “stuck pin”, where a PWM pin sticks low or high.
Obviously the watchdog will catch this, but if a pin gets “stuck high”, then the FET will be stuck ON and we will experience an overcurrent which will blow up the FET before the watchdog can respond.
Do you have any stock circuits that can detect a “stuck high” PWM pin and pull it low?