Hi TI
I have a situation about PFC switching behavior, look at the above picture. condition is 230Vac input/ 30~40% of rated full load.
What I measured is CSA CSB pin, but there is some coupling noise without shortest path of probe. But still can see the valley of waveform, the PFC switches didn't
switching at the valley of waveform. I did re-calculate the Voffset for offset bias circuit. To decrease Voffset from 0.2v to 0.03V and with fine tune all the value of components related. But still without any change on PFC switches stopping at valley of sine wave.
Can you guide me how to find the core of phenomenon? or how to fix it.
Best Regards
KevinLiu
