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UCC28064A: UCC28064

Stuart Linzer
Intellectual 260 points
Part Number: UCC28064A
Other Parts Discussed in Thread: PMP30763,

Hi All, 

On PMP30763 reference design sheet 1.   Transistor Q11 is used to pull down COMP pin.  

Please give insight why this is done.  

Thank You.  

Stuart Linzer

  • 0
    TI__Genius 10555 points

    Hi Stuart,

    Q11 is there to affect the soft start time.  Since there is no dedicated soft-start on the UCC28064A, you're stuck with the soft-start time provided by the compensation components. This circuit allows the designer to separate it from the comp values.

    Ray