Hi,
I have used ti webench to design a 100w push-pull. But, when I load 0.25 A, the input current is gradually increasing and my 4A power supply is going to CC mode. When I checked the gate waveform, the duty cycle is 50% at 0.19 A. And after that it is fixed.i have used etd29 core with 2 & 20 turns. Output inductor used is 220uh. Switching frequency is 200khz. Getting efficiency of 80% at 0.25a load. Can you suggest any solution,for the input current increase problem?
Regards,
Aswathy