• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 392 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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:

TPS54260: TPS54260 ripple current should be >150mA?

WEBENCH® Tools/TPS54260: webench seems to be choosing inductor value too high

bill kenly
Prodigy 130 points
Part Number: TPS54260

Tool/software: WEBENCH® Design Tools

Hello

I'm confused please help.  TPS54260

My design 17v in 5v out @ 0.25a

For a number of good reasons I'm using the TPS54260-ep part at low current.  Webench power designer is suggesting 100uh output inductor.  This value produces a ripple current much lower than the suggested 150ma.  What am I doing wrong?  please see shared link for details.  Thank you

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=0F961774E2106048

  • 0
    TI__Expert 4555 points

    Hello Bill,

    I would recommend using the attached calculator tool for your design. Hope this helps.

    TPS54x40_AND_TPS54x60_CALCTOOL_v1p1.xls

    Let me know if you have more questions, or please close this thread if you think your issue got resolved.

    Best Regards,

    Ankit Gupta

    Application Engineer

  • 0 in reply to Ankit Gupta95
    Prodigy 130 points

    Hi Ankit

    Thank you for your response.

    I like the spreadsheet you supplied.

    I have three more designs to do with the tps54260.

    Question: I think you are saying not to use webench power designer as a starting point, for the tps54260 designs? yes/no??

    thank you

  • 0 in reply to bill kenly
    TI__Expert 4555 points

    Hello Bill,

    I won't say don't use Webench at all. We have not got much of complaints regarding webench for TPS54k parts.  But it looks like Webench doesn't work well with light load applications. I would recommend using the calculator, especially for light load applications. Hope this helps!

    Please close the thread if you think your issue is resolved. Thanks!

    Best Regards,

    Ankit Gupta

    Application Engineer