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TPS7B84-Q1: Recommended Values for CFF

Markus_Fleck
Intellectual 1102 points
Part Number: TPS7B84-Q1

Hello,

In the TPS7B84-Q1 datasheet there is mentioned that there should be some recommended values for the feed forward capacitor Cff in the datasheet. Unfortunately these recommended values seems to be missing. Can you please provide it?

Could you also provide the unity gain frequency mentioned in the following document on page 2:

  • 0
    TI__Expert 6965 points

    Hi Markus,

    Thanks for reaching out about this. The recommended values for the CFF are between 0nF and 100nF, the exact value we would recommend depends on the size of the feedback resistors you are using. Can you provide the FB resistors that you are using and I can give you a better recommendation on the CFF capacitor.

    Unfortunately the UGB of the device is considered confidential information that we can't share here.

    Regards,

    Mark

  • 0 in reply to Mark Sellers
    TI__Intellectual 1102 points

    Hello Mark,

    many thanks for your feedback.

    Please see below the values for the feedback resistors. Please let me know your recommendations for Cff

    Output Voltage: 8,14V

    R out-adj: 47,5 kOhm

    R adj-gnd: 4,12 kOhm

    Best Regards,

    Markus

  • 0 in reply to Markus_Fleck
    TI__Expert 6965 points

    Hi Markus,

    With these resistor values you can get away without a CFF, but i would recommend that you place a 10nF there to help improve the transient performance of the device.

    Regards,

    Mark