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TPA6120A2 possible to bias it for class A operation?

Chris Chan2
Prodigy 20 points
Other Parts Discussed in Thread: TPA6120A2

I know headphone amp TPA6120A2 is designed to operate in class AB.  Is it possible to bias it to operate in class A?

I tried to add a DC voltage at inverting input so that the output swings between 0V and 5V under +/-8V supplies.  Output is ac coupled to a 16 ohm load.  The current draw from positive and negative supplies are the same.  I doubt if it is working in class A or still class AB under this condition.

  • 0
    TI__Guru** 110605 points
    Hi Chris,

    Welcome to e2e.
    This is not a common use of the TPA6120A2, why would you need an operation like this?
    Perhaps you could measure the current consumption when biasing the amplifier to verify if the consumption increases.

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Prodigy 20 points

    Hi Ivan,

    It's a digital audio player product supporting Hi-res loss-less and DSD formats.  Customer likes class A sound.  I know it is not a common use of TPA6120A2 but I really want to see if there is a possibility.  From some previous work, it seems not possible to change the internal bias to make it real class A.  I would like hear from TI experts.

    Regards,

    Chris Chan