TPA6120A2: TPA6120A2 increase gain

aguilera gilles

Part Number: TPA6120A2

Hi, I would like to increase the gain in audio output, here is my circuit diagram
Output resistors are 10 ohms
Can you tell me what resistances I need to increase and what resistances I have to go down to have the most gain without any problem?

regards

over 6 years ago

0 aguilera gilles over 6 years ago

Prodigy 120 points

Part Number: TPA6120A2

regards

0 Ivan Salazar over 6 years ago in reply to aguilera gilles

TI__Guru** 111665 points

Hi Gilles,

In order to increase the gain, you should either reduce the input resistor (R65 & R66) or increase the feedback resistor (R67 & R68).

You can read the datasheet section 10.2.1.2.1 that explains that you can adjust the gain, however you should take into account that lower feedback resistor values introduce less noise to the system but can make the device more susceptible to high frequency oscillations. On the other hand, higher feedback resistor values introduce more noise but makes the device more stable against high frequency oscillations.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 aguilera gilles over 6 years ago in reply to Ivan Salazar

Prodigy 120 points

Hi Ivan, and thanks for that quick answer,
Can you help me to earn more than I currently have?
At the moment all resistors are at 1k ohms including AOPs
What values do you recommend to double the gain on the TPA and AOP?

regards

Gil

0 Ivan Salazar over 6 years ago in reply to aguilera gilles

TI__Guru** 111665 points

Gil,

You can change feedback resistors from 1k to 2k for both TPA and AOP.

Best regards,
-Ivan Salazar
Applications Engineer - Low Power Audio & Actuators

0 aguilera gilles over 6 years ago in reply to Ivan Salazar

Prodigy 120 points

thank you Ivan

regards

Gil

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TPA6120A2: TPA6120A2 increase gain