Hi everyone

I had a problem with a high side FET as well and found the way to this site. It helped me to proceed further.
Here is my finale solution. Maybe it can help somebody someday. It can be used for high frequent switching but doesn’t consume that much power like the sample from above. The input is potential free. The isolation voltage is 3750V. So it can be used for high voltage as well.

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Cheers
Hans-Jörg