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LMR16030: noise ？

kevin.huang_FJXM
Expert 2925 points
Part Number: LMR16030

hi teams:

       12V IN 5V_ There is an inductive noise during the output process of out 0.3A-0.6A

       Inductive saturation current 3.8A.

     Help point out how to modify to solve the noise problem？

  • 0
    TI__Expert 6901 points

    Hi Kevin,

    We see the switching frequency should be around 400kHz which will not cause acoustic noise. Can you check if there exists low frequency ripple in the circuit? You can have a test of Vin IL SW and Vo to see if they are stable? I also suspect inductance noise come from L100 and you can remove it to check again.

    Thanks 

  • 0 in reply to Colin Chen
    Expert 2925 points

    hi Colin:

    1. We will attempt to adjust the power frequency to 400K;

    2. We previously changed L100 to a short circuit at 500K, but the sound still exists, mainly on L101,