I have a problem about UCC28600. I used it as a auxiliary power supply in a project. My problem is when the main power circuit had not started, the auxiliary power supply work well , and the CS SS OVP waveforms are good,
but,when the main circuit start to work , the flyback is disturbed, and go into protection state,(red:output voltage, orange:CS green: SS Blue:OVP ), i have test for some times. the waveforms are the same . I use the output voltage to trigger the waveform . I want to know how can i judge the protection is OVP or Primer Current or REF, I am sure the thermal shutdown is excluded. I am looking forward to your reply.
