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How about the duty cycle maximum parameter when I use ADP1047 for 650w PFC stage

Question asked by kevin.hsu on Aug 9, 2013
Latest reply on Aug 14, 2013 by kevin.hsu

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 !!