TPA3122D2: Oscillation issue....

A K Sumesh

Prodigy 110 points

Part Number: TPA3122D2

Hi,

I was trying to make a portable amplifier using TPA3122. the layout is shown below.

It is not working and oscillates with tick--tick sound.

Please help to fix the problem.

over 6 years ago

0 Shawn Zheng over 6 years ago

TI__Mastermind 24835 points

Hello, Sumesh,
Could you please send the SCH in the attachment? I believe it could help our debug work.
Best regards,
Shawn Zheng

0 Shawn Zheng over 6 years ago in reply to Shawn Zheng

TI__Mastermind 24835 points

Hi Sumesh,
Have your issue been resolved? Plesase let us know if you have any other question here. Please help to close it if you don't more other question.
Best regards,
Shawn Zheng

0 A K Sumesh over 6 years ago in reply to Shawn Zheng

Prodigy 110 points

My issue remain unsolved..

Please Help

Regards,

Sumesh

0 Shawn Zheng over 6 years ago in reply to A K Sumesh

TI__Mastermind 24835 points

Hi Sumesh,

I can't see the thermal pad on the board. How much is the output power in your application. Does the issue still occur with very low output power? If the issue doesn't exist with lower output power, the issue could be a thermal issue. Then need to optimize the thermal design on the board. TPA3122D2 EVM is a good reference design.

Did you measure the waveform on the output pins when the issue occurs? How much is the speaker resistance?

Could you please show me your SCH if possible? It would be helpful for our debugging work.

Best regards,

Shawn Zheng

0 A K Sumesh over 6 years ago in reply to Shawn Zheng

Prodigy 110 points

Dear Sir,

Thanks for your support.

The issue was die to the PCB layout.

I redesigned it with ground plane and moved the decoupling capacitors close to the chip.

Thanks and regards,

Sumesh A K

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TPA3122D2: Oscillation issue....