TPA2080D1: TPA2080D1 POP Noise Issue

Chun Youngsu

Part Number: TPA2080D1

Dear TI Team.

I would like to hear the advice of TPA2080D1 because of POP noise during TEST.

Please refer to the following circuit.

Due to Fixed Gain, we have to reduce the input and add the resistor as above.

POP noise is generated by this.

Decreasing the resistance decreases the THD.

If the THD decreases, we will not be able to use it.

The cause of the pop noise is that the reference voltage rises at the same time when EN Pin goes high.

Is there a way to raise the reference voltage in advance?

please check.

Thanks.

over 6 years ago

0 José Luis over 6 years ago

TI__Mastermind 20085 points

Hi Chun,

First of all, You can add a 1KΩ input resistor in the input that is tied to GND. The input resistor should be placed between the capacitor and GND.
If it is possible to remove the 910Ω resistor and reduce the input signal until avoiding that the output signal is clipped.
Finally, a differential input should help to reduce the pop noise too.
Please try to do this and let me know if this works.

Best Regards
José Luis Figueroa
Audio Applications Engineer

0 Chun Youngsu over 6 years ago in reply to José Luis

Expert 2485 points

Dear José Luis,

thank you for answering.

We can not reduce without using the functional divider resistors that we want to implement. You can not use differential inputs.
The resistance values we used to set the THD for the first time were 10K ohms and 9.1K ohms. In this case, the pop noise is severe and the resistance value is reduced to 1 K ohm and 910 ohm to reduce the pop noise, but it is not perfect.
Can you check if there is another way?

0 José Luis over 6 years ago in reply to Chun Youngsu

TI__Mastermind 20085 points

Chun,

Have you added the 1KΩ input resistor in the input? Below you can watch the circuit modification.

This could help to reduce the pop noise.

Best Regards
José Luis Figueroa
Audio Applications Engineer

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TPA2080D1: TPA2080D1 POP Noise Issue