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TPS54317 Vbias capacitor

Srivatsa Raghunath
Prodigy 180 points
Other Parts Discussed in Thread: TPS54317

What is the role of the Vbias capacitor in TPS54317. 0.1uF is suggested as optimal value for the bias capacitor. What is the start-up implication if we use a low value, say 0.01uF at the Vbias instead of 0.1uF

  • 0
    TI__Guru**** 191445 points

    VBIAS is the internal regulated voltage rail.  The VBIAS cap is the output cap for that rail.  It is required for stability of the internal supply.  The recommended range of values is 0.1 to 1 uF  It may not be stable beyond that range.  It has only been tested in the range specified.  I highly recommend going no lower than 0.1 uF.