tpa3110d2 power noise

Hello, Gyu-Hae,

Can you please describe the issue more in detail? Maybe some waveform captures and issue description. Is the device function normally with expected performance?

reg,

Paul.

Audio Applications

Dallas TX

If i connect only the power amplifier, its occur noise.

5126.power noise.docx

Hi, Gyu-Hae,

Typically, you can improve the power supply noise by a good ground plane and proper placement of decoupling caps.

Order of Priority -

1. Ground Plane

2. Decoupling caps placement and connection.

3. Input and analog control routing

Make sure that the high freq decoupling caps are within 1mm of the IC and place bulk decoupling caps as close to them as possible. Ground hi-freq decoupling caps and GND pins to the PowerPad.

Please follow the EVM layout as close as possible for optimal performance.

Did you try this on EVM as well?

reg,

Paul.

Tpa3110d2evm is in use now.

c13.c19, ------>> 1uF

 FB5, FB6  ------>> 33uH

After a change

Noise is reduced

the noise is emitted

Tpa3110d2evm is in use now.

c13.c19, ------>> 1uF

 FB5, FB6  ------>> 33uH

After a change

Noise is almost reduced

However, when the speaker is connected to the noise 1/3 emission

0250.tpa3110d2 evm er.docx

Hi, Gyu-Hae,

Beefing up the supply filter will help to reduce the switching noise on the supply line as you have observed. Using LC filter at the TPA3110D2 output instead of ferrite bead will help with conducted emission test too. What is the main concern of the noise on the supply for your application? EMC?

reg,

Paul.

thanthank you

1. DAC output terminal is connected to the input terminals of tpa3110d2  occurs noise
2. DAC ground is connected to the input terminals of tpa3110d2  occurs noise
3. tpa3110d2 ground is connected to the input terminals of tpa3110d2  does not occurs noise.

  Ground loop?