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UCC28056: Regarding the shutdown of the UCC28056.

Kyohei
Expert 1460 points
Part Number: UCC28056

Tool/software:

Hi team,

I have a question regarding the operation of the UCC28056.

Is it acceptable to stop its operation by inputting an external signal to the COMP PIN and setting it to LOW?

Best regards,

Kyohei

  • +1
    TI__Mastermind 40520 points

    Hello Kyohei-san, 

    Yes, it is acceptable to stop switching of the UCC28056x by pulling the COMP pin voltage LOW.  

    The transistor that you use to pull COMP low must be able to sink at least 120uA and saturate below 0.5V.  

    Note: Under normal no-load conditions, the VCC bias current would be </= 132uA (at VCC =12V), COMP voltage would be ~0.5V and COMP current would be ~0uA.
    But forcing the turn-off condition by grounding COMP will pull an additional ~120uA (typical) from COMP to GND, and this current comes from VCC, so VCC current can be 132uA + 120uA = ~252uA or higher (depending on actual maximum COMP current).  
    Be sure to factor that into your stand-by power calculations. 

    Regards,
    Ulrich