I am making a PFC circuit for AC-DC converter. I am facing a weird issue. As per my design the output of the circuit should be 390VDC, but I am getting 311VDCrms with ringing (overshoot 360V, undershoot 270V).
And this is the output waveform.
Here it is zoomed
When I turned off Vcc to the controller IC, the output voltage of the circuit is also 311VDC !!!!!
Here is the input of pin 4 in oscilloscope
Here is output of pin 5 in oscilloscope
Here is input of pin 3 in oscilloscope
I am fully confused on what is happening. Please help me !!!!