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TPS65132: The input cap selection

John Liu59
Intellectual 2735 points
Part Number: TPS65132

Dear all,

In our datasheet, for the input cap recommendation, using 16V cap, why do we need so high input voltage cap, is there any concern for lower voltage cap such as 10V or 6.3V in order to save cost?

Thanks.

  • 0
    TI__Intellectual 2735 points
    Dear all,

    In our datasheet, we recommend 4.7uF/16V for the input cap, what about 10V cap if customer want to use? Any concern for the voltage and cap value for this input cap?
    Customer using 4.7uF/10V cap and after their high/low temp, 3 of 10 input cap is damaged, they wonder if it is related to the voltage of the input cap, do you have some suggestions?

    Please refer to Table10 for the recommendation in datasheet.
    Thanks.
  • 0 in reply to John Liu59
    TI__Guru 65200 points
    Hello John,

    The input capacitor is stabilizing the input voltage for the DC/DC converter. A 16V cap was used because of the bad DC bias behavior of the other caps. In the meantime newer caps are on the market and therefore using a cap with 6.3V rating should be fine as well.

    If the source for the input is very noisy, more capacitance might be necessary, but this is dependent on the source.

    Be aware to always check DC bias for ceramic capacitors. For a DC voltage, ceramic caps have always less capacitance than the one written on the package.

    Best regards,
    Brigitte