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UCC28056: Input AC current distortion

Part Number: UCC28056



I am using UCC28056A to boost voltage to 500Vdc at a power output of 30W. When I measure the input AC current and voltage to see the power factor and THD I measure a current which slightly resembles a sinusoid but is very deformed and 90° out of phase with AC voltage. 

Here is a capture of the input AC current i_AC, input AC voltage v_AC and rectified ac voltage v_|AC|.

How do I fix this and get power factor = 1 and less current distortion?

Attached you can find the Excel calculator I used for the design, PDF of the schematic and the Altium project.



2061.240614 SCH UV Bulb Driver v1_1.pdf

0410.260613 UCC28056X_Design Calculator v02 120Vac TI e2e ticket.xlsm

7752.240613 UV Bulb Driver Altium - TI e2e