• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 64 subscribers
  • Views 124 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.

Original question:

TPS25948: Recommended Cout

TPS25947: How to determine Cout

Hideki Hayashi1
Expert 7940 points
Part Number: TPS25947

Hi team,

Can you please teach me how to decide Cout?

There is an equation in the datasheet but there are two parameters (SR is determined Cdvdt (1).  Cout (2) ). What other parameters affects Cout and how to calculate?

Best regards,

Hayashi

  • 0
    TI__Guru 69105 points

    Hi Hayashi,

    Slew rate is decided by cdvdt only. Once slew rate is fixed by fixing dvdt then inrush current depends on COUT and slew rate.

    Regards

    Kunal Goel

  • 0 in reply to Kunal Goel
    TI__Expert 7940 points

    Hi Kunal,

    I think customer decide how much inrush current is accetable first. Then they adjust Cdvdt in order to lower slew rate. If so, which means consideration begin from inrush current, Cdvdt and Cout will be

    Cdvdt = 2000/SR = 2000*Cout / IInrush, where Iinrush is the only value they have.

    Again, please teach me how to determine Cout value?

    Regards,

    Hayashi

  • 0 in reply to Hideki Hayashi1
    TI__Guru 69105 points

    Hi Hayashi,

    COUT is application dependent. COUT customer choose based on there requirement. What COUT and slew rate you choose that will decide inrush current. 

    Regards

    Kunal Goel