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THD drift on UC3854 applications

Other Parts Discussed in Thread: UC3854

Hello,

I use an UC3854 for PFC applications .

Input mains 115Vac 400Hz ,Output 200V 580VA.

I note that the THD current  increase from about 4% at about 6% after 10 min of running,if if freeze the UC 3854 ,the THD decrease to 4% ,and after a few minutes return to 6%.

What internal parameter was modified when temperature on  UC3854 increase?

Have somebody remark something about this behavior ?

Thanks.

Best Regards.