/diy/ - Do It Yourself

>>1053899
I'm having some problem with my pepe motor controller. Everything works when tested individually but when ever I try to run it the high side mosfet driver voltage will not float with the motor phase voltage.

As soon as it starts conducting gate to source voltage drops to 0.5v and only 13V will come out of the mosfet regardless of drain voltage. I tried many bootstrap configurations and even an isolated supply directly into the gate drivers high side VDD but nothing changes.

I can't understand where the voltage drop is happening, I have run lights and fans off the 13V output and I know there's more current than the isolated 15V supply powering the gate driver can supply, there's no obvious shorts anywhere, none of the components are heating up.

This is what the gate looks like on a scope before and after it starts conducting, the peak is about 14V.