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TPA6120A2 Input Series Resistor with Non-inverting Configuration

Sadanori Kato
Guru 36540 points
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

  • 0
    TI__Guru** 103925 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 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 in reply to Sadanori Kato
    TI__Guru** 103925 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 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