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TPS782: min output cap

Part Number: TPS782

hi,

on TPS782 datasheet, bottom of page 12 it is stated "The TPS782 series is designed to be stable with standard ceramic capacitors with values of 1.0 μF or larger at the output."

I have been always puzzled by such sentences, as I never understood if refers to 1uF actual cap (considering DC bias, etc.) or 1uF commercial value.

thanks a lot in advance

KR

Vincenzo

  • Hi Vincenzo,

    Yes I agree that this can get confusing. For the most part the industry uses the term capacitor which would be the nominal value marked on the capacitor. As you mention, this does not take into account any derating. At TI we generally assume up to 50% derating.

    Since application specific conditions will play a role in ac performance including transient response, we highly recommend prototyping. TPS78227EVM-445 can be used early in the prototyping process.

    In order to best understand the application level performance with the desired output capacitors, we recommend performing worst case load transient tests while monitoring the output of the LDO on a scope. The following Application Report discusses how the load transient response can be used in estimating the stability of the LDO:

    www.ti.com/.../slva381b.pdf

    You can learn more about capacitor vs capacitance in chapter 2 of our LDO Basics E-book:

    www.ti.com/.../slyy151.pdf

    Very Respectfully,
    Ryan