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UC3845: Only every second PVM-Signal works

Other Parts Discussed in Thread: UC3845

Hello,

I am using the UC3845 in a conventional flyback design. I use it in current sense Mode and the output signal is connected to an onsemi NCP81074 gate driver.

Sadly only every second PWM signal comes through to the Mosfet and the other signals create only signal peaks. 

Do you have any Idea why that is and how to fix it?

Red - Mosfet Gate signal, Yellow - Voltage at the Current measurement shunt.