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  • TI Thinks Resolved

TPA3116D2: Bridge IC for converting Class-D amplifier output to line output

Guru 30225 points

Replies: 15

Views: 578

Part Number: TPA3116D2

Hi,

Could you please suggest the bridge IC for converting the Class-D amplifier output to the line output ?
I am considering attenuating the output signal of the TPA3116D2 using the potentiometer, the operational amplifiers and outputting the attenuated signal to the line out output.
For the line driver DRV632 is reasonable, but the operational amplifiers that can attenuate the audio signal to approximately from -26 dB to 0 dB with the potentiometer are necessary.
So, could you please review the attached TINA-TI schematic which is designed based on the following application note ?

TPA3116D2_OPA1611_DRV632.TSC

TPA3116D2EVM Evaluation Module
http://www.ti.com/lit/ug/slou336b/slou336b.pdf

TIPD118 Verified Design Reference Guide
http://www.ti.com/lit/ug/slau518/slau518.pdf

DRV632EVM Evaluation Module
http://www.ti.com/lit/ug/slou301/slou301.pdf

Best regards,
Kato

  • Can we understand why you want to use TPA3116D2 to be as line out driver? to make sure PWM output setting well, propose to add 200k load before to next stage amplifer. assigned your TINA model for our colleague to review.
  • In reply to Xiaolin Qin:

    Hi Xiaolin-san,

    Thank you for your support.

    The purpose is that the output signals of TPA3116D2 are converted to the low level voltage which can be monitored with the relatively simple equipment.

    I am looking forward to getting the review result from you.

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    talked with design team. to make it working as line output, need output LC filter cut off frequency < Modulator bandwidth. we have some device specific have line output like TAS6424. I assigned Dylan to take look at your case.
  • In reply to Xiaolin Qin:

    Hi Xiaolin-san,

    Thank you for the comments.

    It would be very helpful if you could modify the attached schematic.
    I am looking forward to hearing from Dylan-san.

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Xiaolin-san,

    Sorry for rushing you but please let me know if you have any updates.

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Kato, i am looking into the TINA circuit, will feedback you soon.
  • In reply to Dylan Yao:

    Hi Dylan-san,

    Thank you for your prompt reply.

    I am looking forward to hearing from you again.

    Best regards,
    Kato

  • In reply to Dylan Yao:

    Hi Kato,

    Some feedback from my side is:
    1. The 100K potentiometer is not suggested, because it will bring in quite a lot noise. need to use low noise, low value(<10K) potentiometer. But if doesn't need flexible attenuation, a fixed value resistor is recommended.
    2. why not use OPA1611 as line driver? Just use OPA1611 as differential amplifier, and convert the differential output from TPA3116 to signal ended.


    Dylan
  • In reply to Dylan Yao:

    Hi Dylan-san,

    Thank you for your support.

    It would be very helpful if the line driver can be configured by using only OPA1611.
    So, could you please provide the recommended schematic to me if converting the differential output from TPA3116D2 to the single-ended line driver output with -20dB gain for OPA1611 ?

    Best regards,
    Kato

  • In reply to Sadanori Kato:

    Hi Dylan-san,

    Sorry for rushing you but please let me know if you have any updates ?

    I am worried that when using the OPA1611 at 24 V, it maybe be output with large amplitude to the line output, so the line receiver will be damaged.
    In addition, the positive and negative power supplies are required.

    Please let me know if you have a good idea.

    Best regards,
    Kato

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