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TPA3130D2: The schematic question for TPA3130D2

Mickey Zhang
Genius 12080 points
Part Number: TPA3130D2

Hi team,

The customer uses TPA3130D2.  His issue is the output voice is small. The attach is his schematic.

PVCC and AVCC are 12V. The speaker is 8ohm/1W. .

I think it exists the issue for his schematic. 

Would you provide some suggestions for the customer's issue and his schematic? Does the customer need to change a high power

speaker?

Best Wishes,
Mickey Zhang
Asia Customer Support Center
Texas Instruments

  • 0
    TI__Guru 62760 points
    Mickey,

    Looking at their schematic, I am confused by their Gain resistors. Table 1 in the datasheet lists some gain setting resistor combinations for the customer.

    The customer gain resistors are R56 and R57. Per table 1, R57 is R1 and R56 is R2. With R2 being 100K, the customer should use R1 as 20k for 26dB gain or R1 as 39k for 32dB gain. I am not sure why they have their R1 as 5.6k.

    I would suggest changing their R56 to either 20k or 39k and checking the output again.

    Regards,

    -Adam
  • 0
    TI__Mastermind 24835 points
    Hi Micky,
    I think the right channel is not used in this application, right? Even it's not used, the bootstrap capacitors between OUTNR/OUTPR and BSNR/BSPR are necessary. So please add 0.22uF capacitors there.
    Please try to enlarge the amplitude of the input signal to see if the output power is higher. From the SCH, 20dB gain setting is used, could you try with larger gain? Another thing you can do is to remove R55 and short R53 to disable the PLIMIT function.
    Best regards,
    Shawn Zheng
  • 0 in reply to Shawn Zheng
    TI__Genius 12080 points
    Hi Shawn and Adam,

    Thanks for your suggestions. Yes, the right channel is not used in this application.

    The customer said his board was small, the 0.22uF capacitors may be not soldered in his board.

    So he would like to get if he does not add the 0.22uF capacitors between OUTNR/OUTPR and BSNR/BSPR,

    what the impact will be on his circuit?
  • 0 in reply to Mickey Zhang
    TI__Mastermind 24835 points
    Hi Micky,
    The bootstrap capacitors still need to be assembled on the board even the channel is not used. If they are not there, the right channel can't switch normally and a fault is probably triggered. Please add the bootdtrap capacitors.
    Best regards,
    Shawn Zheng