• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 61 subscribers
  • Views 1685 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS65177: The value of collector capacitor of VGH

Robin Yu
Intellectual 2190 points
Part Number: TPS65177

Hi team,

In the guideline of TPS65177, it shows larger collector capacitor makes the load transient response worse.

Could 1uF be used? Why does the load transient become worse?

  • 0
    TI__Guru 58215 points
    Hello Robin,

    The load transient response gets slower if this capacitor is bigger because the current change on the transistor caused by the load transient first needs to change the voltage on this capacitor before a change can be observed on the output.

    1uF might be possible, but you might observe as well some stability issues if this capacitor gets such big. We need to check the load transient in the lab to verify this. Tomorrow there is no one in the office who could do this test. You could either check it on the EVM on your side or we can check it on Monday. For this test, it would be great to get some information on the load transient that is expected on this rail.

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    TI__Intellectual 2190 points
    Thanks, Brigitte.
  • 0 in reply to Robin Yu
    TI__Guru 58215 points
    Hello Robin,

    Do I understand your answer correctly that you will check the transient response in the customer application and we can close this thread?

    Best regards,
    Brigitte
  • 0 in reply to Brigitte
    TI__Intellectual 2190 points
    Hi Brigitte,

    Sorry for delay reply. Yes, thanks for your support.

    Robin