This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

UCC28065: pin-to-pin compatible?

Part Number: UCC28065
Other Parts Discussed in Thread: UCC28063, UCC28064A

is the UCC28063 pin-to-pin compatible to UCC28065 or UCC28064A?

Regards, Holger

  • Hello Holger,

    Thank you for your interest in the UCC28063 PFC controller.

    The UCC28063 is almost, but not quite, pin-to-pin compatible with the UCC28064A and -065 parts.
    There are two major pin differences:
    1.  Pin 9 of the UCC28063 is PWMCNTL which can be used to enable/disable a down-stream converter.  It was found that few customers used this function so in the -064A and -065, this pin has been redefined as BRST which sets a threshold level for entering burst mode.

    2.  Pin 4 of the UCC28063 is PHB which is used to enable/disable Phase-B of the PFC using an internal threshold.  For more flexibility, the -064A and -065 keep the same pin name and basic function but allow the enable/disable threshold to be externally programmed.

    Therefore, the external circuitry involving these two pins must be modified/accommodated when/if replacing the UCC28064A/065 with the UCC28063, and vice versa.