UCC28070: Poor Power Factor for unknown reason

Hi Everyone,

I am using UCC28070A for my PFC circuit,

Vin:120Vdc-375vdc

Vout:380Vdc

I Out(max):5.8A

Max i/p Power:2200W

i am using current sense resistor at the source of the mosfet instead of CT in drain.

But i get Poor Power Factor (0.89-0.94).

i have attached the schematic.Please Help me to solve this issue.

Thanks in advance,

Kumar.V2477.SCHEMATIC1 PAGE1.pdf