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UCC25661: UCC256614 About the operation of the TSET(PFC ON/OFF) terminal

user6455458
Prodigy 140 points
Part Number: UCC25661

Tool/software:

Hi, Team
I am considering a circuit using UCC256614.
I have a question about the TSET (PFC ON/OFF) terminal.
Is the TSET (PFC ON/OFF) terminal always in a High state during the LFBurst period?
Can it ever become a Low state during the LFBurst period?