Hi, I'm having trouble with the ir2110 output. I'm working on a class d full bridge amplifier and I use 2 ir2110 to drive 4 irf540N mosfets. The switching frequency I use to generate the PWM is 240kHz and I include a 100ns deda-time (ideally would be no more than 50ns), but still got some peak in the output that generates shoothrough. In the picture you can see the circuit, that includes a snubber, the filter and load.
The porblem I need help with is that the deadtime is correct at the input of the ir2110, but in the output i get a peak (circled in red) which is causing the problem and I don't know what causes it.
Gate voltage rising to 3 V doesn't mean shoot-through with IRF540. If you feel that the gate voltage isn't fully turned off before activating the other transistor, you would increase the dead time.
Oscillating rising edge is a different thing, I guess is caused by parasitic circuit inductance.
22uF as bootstrap is overkill for IRF540. 100 nF is fine.
Voltage is clamped at ~3V. You might decrease the clamp voltage via using a Schottky diode e.g. 1N581x. Or increase dead time to eliminate it altogether.
Can't see any modeled lumped parasitic inductance in the simulated circuit. Real life would. Therefore I am a bit surprised by that oscillation since it does not look exactly like usual gate characteristics.
I think oscillation occurs when the GS voltage hits the supply voltage if there was a parasitic inductance.
In fact the wrong 22uF could really cause problems at the
edges, if ESL, ESR are too high. A lonely electrolytic or low
quality tantalum could be like that. A decent HF 1uF or 0.1uF
might be a good supplement.
The "spikes" I think may just be Miller plateau plus some
setup ringing, are you sure the chosen FET is small enough
(Cgd in particular) that IR2110 is really suitable?