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TPS40210-HT: TPS40210 Softstart Pin Query

Cole Falconer
Prodigy 20 points
Part Number: TPS40210-HT

Hi,

Why do some of the reference materials show a resistor in series with the soft-start capacitor, but there is no mention of this in the data sheet? What is its intended function? As shown below (R3):

Thanks in advance,

Cole

  • 0
    TI__Mastermind 30080 points

    Hi Cole,

    Thanks for using the e2e forum.

    The additional resistor R3 is fully optional.
    The function of this resistor is to fine-tune the softstart time.

    E.g. if your application needs a very specific softstart time and there is no physical cap with this capacitance, you can make small adjustments with a resistor.

    If you find a fitting capacitor right from the start, the resistor is not necessary.

    I hope this answers your question.
    Best regards,
    Niklas