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TPA6211A1 frequently damaged issue

user3569803
Prodigy 10 points
Other Parts Discussed in Thread: TPA6211A1

The schematic can be seen below.

Here is the problem. Even with no signal input(AO_P = AO_N), switching on and off the system a few times will still cause the TPA6211A1 to be damaged. The damaged chip still has output signals, but the temperature of amplifier is quite high. Using multimeter to measure the resistance between VO and GND, the damaged chip has a resistance of less than 10 Ohm. Well obviously, there should be high impedance between VO and GND pin in the new TPA6211A1.

After many tests, TPA6211A1 will be damaged only when the speaker is connected. Without a speaker, it will not be damaged. I have tried both 4 ohm/2W and 8 ohm/2W speakers, the results are the same.

By the way, I tried to keep the system power on for about half an hour, everything works fine. It seems that continuous usage of this chip didn't cause the damage. I assume that the damage happened at the moment of power on or power off.

Is there anyone who knows how to avoid the damage of TPA6211A1?

Sorry for my poor English and I hope everyone can understand me.....

  • 0
    TI__Guru** 110745 points
    Hi user3569803,

    Welcome to E2E and thank you for your interest in our products!

    Is your speaker getting damaged as well?
    I think you could try to add the bandpass filter recommended in the D/S. Follow figure 31 and the recommendations for Ri, Ci, Ra, Ca and Rf.
    With Ri = 4.7 kOhm you're getting gain = 8.5 V/V. Perhaps there is a high frequency signal or a DC component getting into the amplifier, and combined with the high gain setting, the amplifier is operating with this non desired signal with high gain.
    I hope this helps. Let me know if you try adding the bandpass filter.

    Best regards,
    Ivan Salazar
    Texas Instruments