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UC2854B-EP: Query Regarding Vref Voltage Behavior in PFC Controller

Aravind S
Prodigy 110 points

Part Number: UC2854B-EP
Other Parts Discussed in Thread: UC2854, UC2854B,

Tool/software:

Hi Team,

I need to know the voltage on the Vref pin of the PFC controller when I apply 0V to the Enable signal and 15V to the VCC pin of the controller. Will the Vref go to 0V or stay at 7.5V?

Regards,

Aravind S.

  • 0
    TI__Mastermind 40580 points

    Hello Aravind, 

    The UC2854B and B-EP specs are not clear on this question, but the original UC2854 datasheet does have clear information on the state of VREF with respect to ENA:

    Though its datasheet is not explicit about it, I believe that the UC2854B-EP device behaves the same way and that VREF = 0V (is disabled) when ENA = 0V, regardless of VCC voltage.

    Regards,
    Ulrich