This KTB2140 current-mode PWM controller can operate as an active ... Protection features include OCP, short-circuit, thermal, under-voltage lockout (UVLO) and over-voltage protection (OVP).

You can use PWM to control the speed of a motor, the brightness of a LED, or to generate analog waveforms. [Jack] shows how to set up the processor to do locked anti-phase PWM to drive the wheels ...

Of course, the standard way of controlling CPU fans these days is with PWM, so he built a circuit which essentially converts the PWM signal from the motherboard into a phantom thermistor.