• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 39 subscribers
  • Views 194 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.

PMP22650: Selected capacitor

Pablo Ballonga
Prodigy 20 points
Part Number: PMP22650

Tool/software:

Translator

Hello,

I have a doubt about the selection of the bus electrolytic capacitors.

From the BOM, the capacitors selected are the ALA7DA471DE500 from Kemet. 470uF, 500V and 2.5A@100Hz ripple current.

3 caps in parallel therefore 7.5 A, I’ve estimate and simulate the current ripple across the line cycle, and I have obtained a rms current of 17A.

How it is possible that this cap can handle all the current?

Thanks in advance.

  • 0
    TI__Mastermind 41105 points

    Hi Pablo, we are currently looking into this and a response will be posted when available as the original designer for this reference design is currently out of office and will be back the second week of July. It would be good to verify the current ripple with him when he gets back. Thanks!

  • +1
    TI__Intellectual 1585 points

    I believe the RMS current is closer to about 12.4 A total. I cannot locate my analysis files, however, you also need to include the impact of the local ceramic capacitors as well.