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TPA6130A2: TPA6130A2 Bandwidth?

Nic Lin
Intellectual 2020 points
Part Number: TPA6130A2

Team,

Can TPA6130A2 be used to amplify signal beyond 20~20kHz? We used it to amplify a 60kHz tone and drive 16ohm load. However, the output signal becomes noisy. Below is the tested frequency spectrum. Any idea why it is?

TPA6130A2 input:

TPA6130A2 output:

  • 0
    TI__Guru** 100965 points
    Hi Nic,

    There is no low-pass in TPA6130A2 so it should be fine to drive high frequency signals.
    However the supply rejection is reduced as frequency increases, as shown in Figures 23 to 25. Perhaps this is the cause of the noise at high frequencies.
    In addition, take into account the switching frequency of the charge pump, which can be as low as 300kHz.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators
  • 0 in reply to Ivan Salazar
    TI__Intellectual 2020 points
    HI Ivan,
    Any walkaournd can solve this noise issue? If not, could you recommend the alternative device that can be used to get clean 60kHz output? Thanks.
  • 0 in reply to Nic Lin
    TI__Guru** 100965 points
    Nic,

    As this could be caused by degradation of supply rejection, you could try with better supply decoupling. In addition if you want to place a low-pass filter it should have a cutoff frequency between 60kHz and 150kHz, as this is the half of the charge pump switching frequency.

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