Unusual Vdrain waveform
I'm working on a 200W power supply with the TOP261YN.
At no load, I could get the desired output voltage of 22V.
But at half load, the output voltage reduced to 13V (sometimes 15V).
When I probed at Vdrain, it seems that it's not switching down to GND level. I've checked my probe's ground clip, it has good connection. Has this anything to do with the reduced output voltage?
Your comment is appreciated.