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UCC28070: UCC28070 using problem

Part Number: UCC28070

Hi all,

There is something confusing me about UCC28070. In it's datasheet i find:"This device is especially suited to high-performance, high-power, PFC applications where the use of Average
Current Mode PWM control gives low THD."

could you introduce me the function principle detailed about Average Current Mode PWM control? cause i found ti's quite difference in Average Current Mode PWM control!!!

Looking forward to your reply!