4118.PFC.pdf
Hi All,
We use UC3854 as PFC controller for power supply 500W, this product already mass production but recently we found some unit fail THD so we try to reduce R1 and keep R2(see attach), the fail unit become good unit( pass THD). Do TI have any application note how to choose suitable resistor connect to MOUT pin of UC3854A or any recomend are welcome?
note: application circuit as attached
Thanks
NT