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TPA3122D2: Example Circuit Not Working, Breaking Chips

Emmett Palaima78
Prodigy 90 points
Part Number: TPA3122D2

Hi, I'm trying to use the TPA3122D2 to drive a speaker driver in a design. To test it out I purchased components to build the example circuit given here: http://www.ti.com/lit/ug/slou214a/slou214a.pdf (P.4 Figure 3).

I built out the circuit and tried to use it to drive a small 8 ohm speaker with music from my phone, but the chip almost immediately started getting extremely hot, and the speaker only played a quiet clicking. I have checked and double checked the circuit and am certain that I wired everything correctly. I also tried building the circuit on a different breadboard with a new chip, with the same result.

Is there anything in my component choice that might be leading to this result, or any other factors I should look into?

Here is a link to the mouser cart where I purchased the components: https://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=81726d98eb

Really not sure what to try at this point, any advice is appreciated. 

 

  • 0
    TI__Genius 9200 points
    Hi Palaima,

    The components are good. Can you do below thing step by step to locate the issue point.
    1. only put the device and C5, C6, C8, C2, C3, C4, C15, C12, C14, C13, J1, J2, and R1, R2.
    2. set to shutdown, and power up to see if anything abnormal.
    3. pull shutdown pin to high, and power up to see anything abnormal.
    4. Finally place output stage inductor and capacitor to see anything abnormal.

    I believe there must be something wrong with the external component. Would you share your schematic and layout, maybe we can find more infroamtion from your layout. My colleague Andy will follow up with you for the following support.


    Dylan
  • 0 in reply to Dylan Yao
    Prodigy 90 points

    The schematic is the schematic from the datasheet that I linked in my post above. There is no board layout at this point, I am using a solderless breadboard.

    The main thing I was hoping to find out is if there was some aspect of the external components which might cause the chip to behave in this way. I bought capacitors, resistors and inductors of the correct values, but these components have other traits so perhaps there is something there that I'm missing. Could you please advise on this point specifically?

    When testing the chip does not appear to misbehave until I plug in a speaker. I'm using an 8 ohm speaker for testing.