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Original question:

TPA3110D2: #Audio #TPA3110D2PWPR #Fault

TPA3110D2: don't have audio output, and the chip continuously resets without any input.

AKHIL RAJ PM
Prodigy 30 points
Part Number: TPA3110D2

combinepdf.pdf

Hi Team,


I'm using the TPA3110D2 for one of my client projects. We're employing this chip for 2 x 15W audio amplification, with input coming from the Realtek audio codec ALC5616-CGT. However, the TPA3110D2 isn't functioning when we provide any audio signals from the codec. While debugging this issue, here are my observations:

1)  While probing the LINP and RINP pins without providing any inputs, the pins show 2.5V and then drop to 0V every 420 milliseconds. (Since the SD and FAULT pins are shorted in the circuit, I suspect this behavior is due to the chip restarting because of the DC fault detection.) Is the 2.5V observed the bias voltage?
I tried pulling down the FAULT/SD pin while powering up and releasing it after some time when the power was stable, but the same issue persisted!

2) In our circuit, we have shorted the SD and FAULT pins. While probing these pins, it shows a pulled-down state for 420 milliseconds and released for 2.5 milliseconds. (I believe this is due to a DC fault.) (without any input)

3) When playing any audio, there is no sound output, and the output and input also exhibit an on-and-off nature.

I have attached the schematics and the screenshot of my observation. Please guide me to solve the issue.

  • +1
    TI__Genius 14420 points

    Hello Akhil,

    Yes the voltage on the inputs is the internal bias voltage. In your design is C357/365/370/378 populated? i see you are using a ferrite bead filter but still has those caps in the provided schematic.

    regards,
    Luis

  • 0 in reply to Luis Fernandes de Pina
    Prodigy 30 points

    Hello team,

    Thank you for the reply. I removed the large value output capacitors, and now the amplifier is working. However, I noticed that when I power on the circuit and play any audio, initially, the speaker produces a high sound( sounds like TUK) and there is a large current consumption. Then it plays normally. If I play the same audio again, there is no issue, and the system works normally. However, if we stop playing for some time and then play the same audio again, the same issue occurs initially, and after that, we can play the same audio multiple times without any issue.

    The issue only arises the first time after a power cycle or playing some sound after a gap in time. If continuously playing within 30 to 60 seconds, there is no issue. Additionally, during normal operation, we can increase the volume, and it works fine. However, at high volumes, if we turn off the system and restart the power, my power supply turns off due to a high current fault.

    How can we solve this issue?