TPA6120A2 Input Series Resistor with Non-inverting Configuration

Sadanori Kato

Other Parts Discussed in Thread: TPA6120A2

Hi,

Could you please tell us how to adjust the input series resistors(R7 & R8) since we would like to minimize the offset voltage with a non-inverting configuration as the following schematic ?
Moreover, please give us your advice if you have any other ideas and application notes.

Best regards,
Kato

over 9 years ago

0 Ivan Salazar over 9 years ago

TI__Guru** 111895 points

Hi Kato-san,

If you need to reduce the offset voltage, you could try to add a DC blocking capacitor at the output. Another option could be to place a DC servo at the feedback path; we haven't implemented this but TPA6120A2 should be able to work with this kind of feedback connection.

Best regards,
-Ivan Salazar
Texas Instruments

0 Sadanori Kato over 9 years ago in reply to Ivan Salazar

Guru 36540 points

Hi Ivan-san,

Thank you for your information.
Could you please share an additional information to us if you have any application notes since we would like to know how to place a DC servo at the feedback ?

Best regards,
Kato

0 Ivan Salazar over 9 years ago in reply to Sadanori Kato

TI__Guru** 111895 points

Hi Kato-san,

Unfortunately there is not an application note about this. But there is a simple schematic about this in the attached document; although I have not verified its operation, you can use it as reference.

Best regards,
-Ivan Salazar
Texas Instruments

DC Servo for TPA6120.pdf

0 Sadanori Kato over 9 years ago in reply to Ivan Salazar

Guru 36540 points

Hi Ivan-san,

Thank you for your prompt reply.
I will inform our customer of your information.

Best regards,
Kato

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TPA6120A2 Input Series Resistor with Non-inverting Configuration