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LMQ61460EVM: LMQ61460EVM ripples

user5990201
Prodigy 190 points
Part Number: LMQ61460EVM
Other Parts Discussed in Thread: LMQ61460

Hi expert,

When I evaluate LMQ61460EVM, I find that the waveform is always  shaking, no matter how i adjust the trigger. Is the reason that spread spectrum function of LMQ61460 cause this issue? Also, you can see some unregular peaks on the output ripples, do you have any idea about which could cause this issue? Thanks!

  • 0
    TI__Guru 50120 points

    Hi,

    What is your application condition (VIN,VOUT,IOUT,FSW,etc.)? Are you using the default BOM components on the LMQ61460EVM?

    When measuring the output ripple, are you using proper techniques (pig-tail method or tip and barrel method) to accurately measure the output. Can you try this method on capacitor C5 which is the first output cap that the EVM has.

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    TI__Guru 50120 points

    Hi,

    I'll close this thread for now since I haven't heard back from you for some time so I assume the issue was resolved on your end.

    Please feel free to reply back to this thread to reopen for further troubleshooting.

    Regards,

    Jimmy