I do a PFC stage for 650w which use ADP1047
switch freq = 60K
Choke = 370uH
When I checked the duty cycle during the VAC pin valley @Vin=230V
Why the duty close to 95% ? Is it right ? (see the attachment , yellow for duty cycle , green for ADP1047 VAC Pin)
If it is wrong , plz suggest us how to solve this issue !! Thanks so much
By the way , It will have the same condition @Vin=115 !!
xudong Would you kindly help to check this ? Thanks !!
Does any one would hlep to check this one ? Thanks so much