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LMR62421　peripheral circuit

Seishin
Genius 4135 points
Other Parts Discussed in Thread: LMR62421
Hello,
We attached and you may find a failure report of the part number LMR62421 received from one of our customer.
The customer needs the solution quite urgently.
Please proved an adequate solution as soon as possible.
We assume what our customer found was a significantly critical issue.
We strongly urge you to solve this problem before getting in the mud.
Anyhow, we are looking forward having your reply soon.
Thank you.
Seishin
  • 0
    TI__Genius 16025 points
    We've received your query and will get back to you shortly.

    Thanks,
    Anston
  • 0
    TI__Mastermind 23845 points
    Hi,

    Do you have the layout files for the part that is being used in the customer? If you don't have it and it could be a noise issue, please make sure if the loop involving switch node, diode and output capacitor to be small.
    You can also try to configure the EVM on this part and change the BOM to match your customer BOM and see if the oscillation still occurs. This will help us if the issue is caused by layout or by something else.
    Also the 1000pF CFF value looks kinda large and could inject some noise also to the FB pin. Is this value recommended by webench?

    Thanks
    -Arief
  • 0 in reply to Arief Hernadi
    Genius 4135 points

    Hi Arief,

    Thank you for your advice. I revised it as you said.

    After the board layout review, oscillation was stopped, and it is operating normally.

    Regards,

    Seishin