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LM5149-Q1EVM-400: Inquiry about start-up waveform

Jamie LEE
Prodigy 360 points
Part Number: LM5149-Q1EVM-400
Other Parts Discussed in Thread: LM5149-Q1

Tool/software:

Hi experts,

I'm testing LM5149-Q1 EVM and I'd like to check Start-up operation and did a lab test.

[Vin=24V, Vout=12V, Iout=4A, Fsw=400Hz]

According the test result, Vin increases and then slightly decrease, while Vout and Iout exhibit repetitive rising and falling waveforms.

I believe the UVLO function might have been activated, and I'd like to understand the cause.

I appreciate your advice.

Thank you!

Best regards,

Jamie LEE

  • +1
    TI__Genius 11545 points

    Hi Jamie,

    It seems like the power supply isnt able to supply the required power. Where exactly are you measuring the Vin? 

    Can you check if the power supply is not hitting current limit? 

    Can you also repeat this test with a lower output current (say 0.5A) and check if you see similar behaviour? 

    Thanks,

    Best Regards,

    Taru