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Can TPA6120A2 fo bridge amplifying?

AlbertShi
Prodigy 30 points
Other Parts Discussed in Thread: TPA6120A2

If I have a differential audio signal, IN+ and IN-, to connect IN+ to R+ of TPA6120 and IN- to L- of the chip, and ground R- and L+ of TPA6120A2, so make a single TPA6120A2 a mono bridged amplifier. Is that possible? Can this configuration improve the sound qualities?

Thanks,

Albert

  • 0
    TI__Expert 6275 points

    Albert,

    The configuration you are proposing will not work.  The left amplifier will have a gain of -1V/V, which will invert the signal applied to INL-, whereas the Right amplifier will be set to a gain of 1V/V.  Your outputs will be in phase, and the same voltage will be applied to both sides of the load.  If you want your outputs to be 180º out of phase you will need to apply your IN- signal into L+.  We don't recommend bridging these two channels for mono operation.  However, if you want to operate this amplifier in mono mode we recommend using the LEFT amplifier and disconnect RVCC+ and RVCC- to save power.

    If you are concerned about noise performance then you can try decreasing the value of RF.  Let me know if you have further questions on your design.

    Best regards,

    Alfredo Barriga

    Audio Applications Engineer.

    Dallas, TX