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ESR requirement on TPS65132B

Given Ding
Genius 10145 points

customer want to know the effective ESR requirement of input cap for TPS65132B.

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Thank you.

  • 0
    TI__Expert 8010 points

    Hello Given,

    The recommended input and output capacitors from the TPS65132B are from Murata and there you can get the information about the ESR characteristics.
    Murata is providing a very useful tool, SimSurfing where you can analyze the characteristics of many capacitors.

    As an example, this is the ESR vs. frequency curve for the input capacitor:

    You can find all recommended components from Murata in this tool and get the characteristic curves.

    Best Regards.

    Ilona

  • 0 in reply to Ilona
    TI__Genius 10145 points
    Hello Ilona,

    so if customer want to use caps from other vendors ( not Murata), they also need to satify the ESR of Murata caps, right? But I think it's hard to match the whole curve of ESR. Thank you.

    BRs
    Given
  • 0 in reply to Given Ding
    TI__Intellectual 2805 points

    Hello Given,

    Customer may use capacitors from other vendors which match the recommendations in datasheet regarding effective capacitance and else (see capacitor selection section on D/S page 27). It is not necessary to have the same ESR vs frequency curve. In general, using a capacitor with a low ESR is recommended.

    Best regards,

    Diaara 

  • 0 in reply to Diaara
    TI__Genius 10145 points

    Hi Diaara,

    Thanks for your reply.But customer feedback they need a specified value for ESR, for example, <50mohm. Then it's easier for them to choose cap. Can we provide such requirement? Thank you.

    BRs

    Given

  • 0 in reply to Given Ding
    TI__Expert 8010 points
    Hello Given,

    You can take the ESR value of the above ESR characterization curve as an indication. As an example the ESR should be in the range of 3 mOhm at 1 MHz.

    Best Regards.
    Ilona