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Choosing Decoupling Capacitors Values for TS482IDT audio amplifier.

Kenny03
Associate II

Hello,

We have an audio amplifier circuit in our design using the TS482IDT chip. We're wondering if there's any guidance on what is a good value for decoupling capacitors for the chip? Is 0.01uF acceptable? Or Could we use 0.1uF?

Thanks, 

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no calculation. :)

just : this is an audio amp, so you want a cap, thats effective at frequencies < 20 kHz, but also filtering/reducing high frequ. input (spikes, noise ) ; and cheap - matching the amp price range -> ceramic caps now cheap, even in "big" values (for decoupling caps) , so i use 10u /25V X7R in 0805 size (about 10ct ); if your supply is good for audio (low impedance, low noise ) this 10u is all you need. (close to chip )

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7 REPLIES 7
Issamos
Lead II

Hello @Kenny03 

You can find her the values of the Input coupling capacitor (Cin):

Screenshot_2023-09-14-22-14-45-69_e2d5b3f32b79de1d45acd1fad96fbb0f.jpg

And the values of the Output coupling capacitor (Cout):

Screenshot_2023-09-14-22-12-56-94_e2d5b3f32b79de1d45acd1fad96fbb0f.jpg

Screenshot_2023-09-14-22-13-35-62_e2d5b3f32b79de1d45acd1fad96fbb0f.jpg

Also, you have a typical application schematic that you can use:

Screenshot_2023-09-14-22-09-12-73_e2d5b3f32b79de1d45acd1fad96fbb0f.jpg

For more details, refer to the this document .

Best regards.

II

AScha.3
Chief III

decoupling ...power supply ? for audio, 10u minimum close to chip, and 470uF elko somewhere.

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..he write: decoupling , not coupling.

If you feel a post has answered your question, please click "Accept as Solution".

Thank you for the rectification. @AScha.3. It was careless mistake.

This helps thanks, could you please give some insight as to how you arrived at 10uF? I'd like to understand the calculation or rationale behind this number.

no calculation. :)

just : this is an audio amp, so you want a cap, thats effective at frequencies < 20 kHz, but also filtering/reducing high frequ. input (spikes, noise ) ; and cheap - matching the amp price range -> ceramic caps now cheap, even in "big" values (for decoupling caps) , so i use 10u /25V X7R in 0805 size (about 10ct ); if your supply is good for audio (low impedance, low noise ) this 10u is all you need. (close to chip )

If you feel a post has answered your question, please click "Accept as Solution".
Kenny03
Associate II

Awesome thanks for the info. This helps.