
takes some time to turn ON, and when the control input changes state, the transistor takes
some time to turn OFF. During the turn-on and turn-off times, the transistor dissipates
power, just like an analog driver does. This limits the maximum PWM frequency that can
be used. The higher the PWM frequency is, the higher the percentage of time that the
transistor spends in the intermediate state, where it dissipates the most power. If the PWM
frequency is high enough, the transistor will never turn completely OFF or ON, and will
dissipate significant power.
Resolution Limitations
A PWM system is typically implemented with a digital counter that generates ...