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CCS/UCD3138: How to realize low current detection regulation in PFC of UCD3138 ?

Part Number: UCD3138

Tool/software: Code Composer Studio

PWM duty is very small, and EADC cannot sample the current transformer signal, resulting in a large duty ratio of one cycle. At this time, it is detected that the current transformer signal is large, and the duty calculated in the next cycle is 0 ?

Change the PID coef , it doesn't work .

How to realize low current detection regulation in PFC of UCD3138 ? Do you have some suggestions about it ?