TPA3123D2: Inductance whistling

Liu Yang

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

over 3 years ago

0 Robert Clifton56 over 3 years ago

TI__Mastermind 23200 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 Liu Yang over 3 years ago in reply to Robert Clifton56

TI__Expert 5945 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 Luis Fernandes de Pina over 3 years ago in reply to Liu Yang

TI__Genius 14570 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

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TPA3123D2: Inductance whistling