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TPA3106D1 Questions

JLP
Prodigy 40 points
Other Parts Discussed in Thread: TPA3106D1, TPA3100D2

Hello,

I am working on a design using two TPA3106D1 amplifiers as a stereo pair.  I have a few items that I would like to clear up:

1)  Since I am using one unit as the master, do I need ROSC stuffed on the slave unit?  If not, what should I do with the pin?

2)  Any special considerations for VREG between the two chips?

3)  Is it OK to directly control SHUTDOWN and MUTE direcly from a microcontroller pin/digital VCC?  Or would it be better to buffer through a transistor and use VREG?

Any other hints/considerations outside the data sheets/app notes would be greatly appreciated!

 

Thanks,

JP

  • 0
    TI__Guru**** 189401 points

    Hi, JP,

    Sounds interesting! I assume you are using 2xTPA3106D1 because you need more power than our stereo solutions? Make sure you have plenty of copper for heat sinking....

    We also have a new family of analog-input class-D amps at much higher power levels - check TAS56xx families.

    Anyway, for your questions:

    1) yes, you need to populate ROSC on the slave device

    2) Keep them separate

    3) Yes. There are issues if you drive the GAIN pins when the part is shutdown. Either use a buffered VREG like you proposed, or just make sure your micro doesn't drive the gain pins

    when the part is shutdown. It won't start-up if you do.

    Make sure you use good caps in the audio path! No Y5Vs!!!

    -d2

     

  • 0 in reply to Don Dapkus
    Prodigy 40 points

    Thanks Dan!

    Correct on the configuration. We have used the TPA3100D2 successfully but now need to up the power.  My application has a single 12-24VDC power supply so the TAS56xx series isn't a fit... they are very interesting though!

    The gain will be fixed and tied to VREG/GND respectively.  So in that respect, it sounds like I could, simply drive the SHUTDOWN and MUTE pins directly from the micro. 

    Perhaps in the following configuration:

     

                        +--- MUTE (amp 1)

    GPIO--------|

                        +--- MUTE  (amp 2)

                       +--- SHUTDOWN (amp 1)

    GPIO-------|

                       +--- SHUTDOWN (amp 2)

     

    This would leave the pins driven off the digital VCC (3.3V) with appropriate pull-up/down resistors.  Other than current issues, do you see any potential gotchas?

     

    JP

  • 0 in reply to JLP
    TI__Guru**** 189401 points

    JP,

    It looks good to me!

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 40 points

    Excellent. Thanks again Dan!

     

    JP