Dear Expert
Could you give some advice how to reduce the pfc inductor spikes and imporve efficiency .
The customer outputs 100W and 20V5A from the ready-made solution of the existing model, but changes the power supply structure. It is found that the UCC28056 efficiency is reduced from 90.3 to 89.3 points in full load, and the same problem also exists in half load.By measuring the PFC inductance current waveform, there is an abnormal spike relative to the previous mature scheme.
PFC inductor current waveform:
2. By looking at the driving waveform and comparing the inductive current waveform, it is found that there are driving waveforms and large and small waves: