I was thinking about this last night as I was walking home from the lab, so somebody help me out. First, let me make sure this is all right:
A class D amp takes the signal, compares it using a pulse width modulator (PWM) then eventually sends the square wave signal to the gates of a power CMOS pair. On an un-bridged configuration, the MOSFET's see either the supply voltage or the negative supply voltage (after it has been bumped up by the x-former). The voltage drop across the load/MOSFET's is always going to be the same for any volume level. The current though is determined by the applied gate voltage.
Now, what happens if you drive your class D amplifier into severe clipping. The MOSFET's cannot see any voltage above the supply voltage, but they can draw more current from this supply. Does this mean then that if your amplifier doesn't have over-current protection (or something of that nature) it would simply draw too much current and destroy the MOSFET's?
Second question. How does a Class D amplifier clip anyways? If its output is a square wave at all volume levels, how can you overdrive it and make a "harsher" square wave?
Thanks for all the help!