My Power Supply using UCC28610 flyback design, Vin: 220-380V AC, Vout 18V, use the design ref Now it have a problem after 2 months working fine. When start Vin, Vout was 14V and decrease slowly to 0V. I'm confusing about the feedback module, check the opto and found that no Votage was feedback to the UCC28610. But the problem is that, although I change the opto, there is still no voltage feedback
(At the Opto, the voltage at the Vout side was stil have, but the voltage at the UCC28616 side was Zero)
Does any body have same problem?
