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Class D Switching Power Amplifiers and Power D/A conversion

TPA3118 noise and pop sound
TPA3118 noise and pop sound
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Old 14th September 2017, 08:24 AM   #1
papaarrugada is offline papaarrugada  Germany
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Default TPA3118 noise and pop sound

Hello all,
I am new in this forum and hope for a short answer.
I have searched in some threads and found some interesting ideas, but want to ask for a suggestion for my constellation:



This are my mono amps:


DC 8-26V PBTL TPA3118 Mono Digital Amplifier Board AMP Module 1*60W for Arduino | eBay



I have on RasPi running a LMS player called piCoreplayer, which can control a mute output. This can be connected over an optocoupler to the mute input of the 3118 board.
Without muting I have a very disturbing noise (with open line inputs too) and a switch on/off pop sound.
And I have two different power supplies for RasPi (5V) and for the mono-amps a 19V DC.


I another thread I found a solution with a protecting board (with delay) in series of the amp outputs to the speakers.


Question:
Makes it sense to generate a delay with the RasPi over GPIO to extend the muting?
Is it always necessary to use the protection boards at the outputs to the speakers?


Many thanks for your answers.

Last edited by papaarrugada; 14th September 2017 at 08:57 AM.
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Old 14th September 2017, 08:56 AM   #2
doctormord is offline doctormord  Germany
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If you have noise on the amps output, your muting isn't working correctly.
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Old 14th September 2017, 09:22 AM   #3
papaarrugada is offline papaarrugada  Germany
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Thanks for your answer.


When muting is active, I don't have noise.
But the muting is active only 2-3 seconds after starting the RaspI. Then the GPIO outputs are working.


Can I remove the power on/off pop sound only with the muting?
Or is it necessary to use the protection board on the amp output?
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Old 14th September 2017, 01:20 PM   #4
doctormord is offline doctormord  Germany
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Yes you can. Afaik the boards mute input is connected to SDZ, so "low" puts the outputs to High-Z.

To have a power-on mute, put a pulldown-resistor to GND (like 1k) on this pin and pull this pin high with your raspi when playing music.

Last edited by doctormord; 14th September 2017 at 01:26 PM.
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Old 14th September 2017, 03:03 PM   #5
papaarrugada is offline papaarrugada  Germany
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ok, great!


And to reduce the noise during playing or pause I have to change the gain of the amp module?


In another thread I read that resistors are responsible for the max. setting of 32dB. Should I change the values to reduce the noise?
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Old 14th September 2017, 04:56 PM   #6
voltwide is offline voltwide  Ireland
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Quote:
Originally Posted by papaarrugada View Post
ok, great!


And to reduce the noise during playing or pause I have to change the gain of the amp module?


In another thread I read that resistors are responsible for the max. setting of 32dB. Should I change the values to reduce the noise?
You may reduce noise by a lower gain setting.
Be aware gain setting is read once on power up, so you cannot change it "on the fly"
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Old 14th September 2017, 07:18 PM   #7
papaarrugada is offline papaarrugada  Germany
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I understand.

What resistor values should I use?
Is there a "best" setting to avoid the noise?
And which resistor I have to change?

I don't have a schematic diagram from the board.
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Old 14th September 2017, 07:29 PM   #8
Khron is offline Khron  Finland
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Datasheet: http://www.ti.com/lit/ds/symlink/tpa3116d2-q1.pdf

Page 11, the table at the top, and follow the traces from the relevant chip pins to see what's what.
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Old 14th September 2017, 09:11 PM   #9
voltwide is offline voltwide  Ireland
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The "best" noise performance is achieved at the lowest gain setting, i.e. 20dB voltage gain. The drawback is the inferior sensity of the amp. To yield 10V of output (25W/4Ohm) you need 1V of input voltage.
You will find you have to increase your volume potentiometer to achieve a certain level of output power.
So it depends on the input level that is available to you.
In most cases you will have to find a compromise somewhere in between that suits you.
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Old 14th September 2017, 09:46 PM   #10
papaarrugada is offline papaarrugada  Germany
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thank you all for your support!

I will report my results.
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