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UCC25661: How to connect UCC256614 and UCC28064A

user6455458
Prodigy 140 points
Part Number: UCC25661
Other Parts Discussed in Thread: UCC28064A

Tool/software:

I am considering a circuit using UCC256614 and UCC28064A.
How should I best connect TSET (PFC ON/OFF) terminal to UCC28064A?

I am considering using the external disable function of the UCC28064A to connect the UCC28064A - VSENSE terminal to the UCC256614 - TSET (PFC ON/OFF), but won't there be a problem with the VSENSE voltage (approximately 6V) being applied to the TSET terminal?

  • 0
    TI__Guru 50190 points

    Hi,

    The UCC28064A can be disabled by pulling the VSENSE pin toe GND. So if you connect the Drain of an N-Channel FET to this, the source to GND, and the gate to TSET, the PFC will automatically be disabled when the UCC256614 enters into burst mode. 

    I hope this answers your question. 

  • 0 in reply to JCHK
    Prodigy 140 points

    Thank you for your answer.

    I had mistakenly thought about the operation of the TSET (PFC ON/OFF) terminal in the opposite way.

    The circuit you proposed worked.