TPA3116D2: Audio project

Tsvetan Ginin

Part Number: TPA3116D2

Hello,

I have a problem with noise from the power supply(switching on 220Khz) and that from the digital part (SBC - NanoPi Neo Core). Its amplitude is about 20-30mV. How could I realize selective amplification only from 30mV upwards?

Tsvetan GininNanoPi_Audio_SCH.pdf

over 6 years ago

0 Alix Wan over 6 years ago

TI__Genius 9995 points

Hi Ginin,

TPA3116D2 is a closed-loop amplifier with high PSRR. I am sorry but i cannot understand your question and can you share more details about "How could I realize selective amplification only from 30mV upwards"?

Alix Wan.

0 Yanming Gong over 6 years ago

TI__Mastermind 19960 points

Hi,

Do you mean there is DC/DC switching frequency noise? and the noise is coupling on audio input?

If so, you can add RC filter to filter the noise.

Regards,

Derek

0 Tsvetan Ginin over 6 years ago in reply to Yanming Gong

Intellectual 490 points

Hi Derek,

I eliminated the power supply to the board through an external power supply and the noise disappeared. I need a filter for a switching power supply with an output noise below 10mVp-p.

Thanks,

Tsvetan

0 Yanming Gong over 6 years ago in reply to Tsvetan Ginin

TI__Mastermind 19960 points

Hi Tsvetan

Did you add pi-filter(10uF+4.7uH+10uF) on PVDD?

I think you should place the question for power production experts.

Derek,

Regards

0 Tsvetan Ginin over 6 years ago in reply to Yanming Gong

Intellectual 490 points

Hi Derek,

Thanks for a tip.I will turn to the forum of power supply experts.

Regards,

Tsvetan

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TPA3116D2: Audio project