Other Parts Discussed in Thread: UCC28064
Hi,
We used UCC28065 for our AC-DC board from 360Vac to 15Vdc, 20A. We are seeing negative current spikes (6A) at primary side of the flyback transformer. This is happening at irregular intervals. Attaching the wave from below. The switch node voltage is different before this happening. Could you please help and suggest us how to rectify this?
Yellow :- Gate signals GDA
Green :- O/p voltage
Blue :- Switch node current at primary
Pink : Switch node voltage.
Regards,
Prebin