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Original question:

TPA3123D2: Audio amp continues to have Thermal Shut-Down Issues

TPA3123D2: Inductance whistling

Liu Yang
Genius 9390 points
Part Number: TPA3123D2


Hi Team,

We used schematic on page 1 of the datasheet, but it has the problem of inductance whistling at its output. The higher the current is, the louder the sound is. The frequency of the whistling is the same as that of the output sound source.
Could you give us some advices?

Beat Regards,
Tom Liu

  • 0
    TI__Mastermind 28130 points

    Hi Liu,

    Can you provide the inductors datasheet? 

    Perhaps using an inductor made with different materials would help reduce this whistling phenomenon you are experiencing. 

    Best Regards,

    Robert Clifton

  • 0 in reply to Robert Clifton56
    TI__Genius 9390 points

    Hi Robert,

    Thank you for your reply.
    The attached is the datasheet of inductor.
    It will be very helpful if you can give us some advices.

    L2 Datasheet.pdf

    Beat Regards,
    Tom Liu

  • 0 in reply to Liu Yang
    TI__Genius 15200 points

    Hello Tom,

    At high output power, you might hear some noise from the inductor as the current through the inductor changes which can manifest in vibrations or sound. You can try different inductors that have a core/winding vacuum varnished, but this is a property of some inductors that if there is a high current change that it can result in noise.

    Best regards,

    Luis