Saturday 15 June 2019

H-Bridge MOSFETS getting hot with no load


I have the following circuit: Driver


The circuit is working fine, but the problem is that when there is no load, the IRF9540 are getting hot. When they are in load, they are cold. For sure, I think it's a problem with the gate-source resistors.


I measured the voltage drop between G-S on the IRF9540 and I have the following values: -3.5V in no load and ~-11V in load.


I don't know how to tune the circit to remove this no-load heating, so I'm asking for your help. Thank you !





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