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TPA0202: POP observed while operating SHUTDOWN pin

Krishna Patel
Prodigy 10 points
Part Number: TPA0202

Hello,

I am using TPA0202PWP IC for playing stereo audio tones. 

Please find design PDF as below:

TPA0202 Audio Amplifier Design.pdf

I am facing below described issue:

"Whenever the IC comes out of the SHUTDOWN state, there is a glitch observed on the speaker terminal after fixed interval of 55 to 58 ms. We also isolated the input signal which is given from the DAC of our MCU and just operated the SHUTDOWN pin and we can observe the same glitch every time at the fixed interval."

Please find capture of our observation.

Please let us know what we can incorporate in our design to resolve it. Also please note that all the components selected are satisfying the BTL and SE configuration equations which are mentioned in the datasheet.

  • 0
    TI__Mastermind 18545 points

    Hello, 

    Our team is looking into this thread and will respond as soon as possible. 

    Best Regards, 

    Justin Beigel

  • 0
    TI__Guru** 102955 points

    Hi Krishna,

    My guess here is that the charge time of the passives around the device is longer than the ramp up time of the internal bias of the device.
    One possible thing to try is to use bigger capacitor on bypass pin, this will make the ramp longer and the artifact should not be passing through the device as it is still not completely powered up.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators