Class D audio amplifier design HELP PLS

Hi guys I am attempting to simulate (MultiSim) and build a class d amplifier with the following specs:
AT LEAST 5W RMS output
single power supply
connected to 8 ohm speaker.

I have seen a few circuits online surrounding the IR2110 gate driver:
I would like to implement this circuit, however I'm having doubts because I'm struggling to simulate it.

I have provided what graphs I can, if anyone could shed any light as to what the hell I'm doing wrong please fire away.