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TPA3221: Occasional damage issues

user5883945
Expert 1576 points
Part Number: TPA3221
Other Parts Discussed in Thread: TPS3802

Tool/software:

Dears,

  Application scenarios:
Switching power supply, voltage 30V, using 2pcs TPA3221, all in main mode, 600KHZ, TBTL mode. Switching power supply outputs 28.5V to power amplifier;
Customer proposes several improvement plans，
1. The voltage of the switch power supply is too high. The customer has already modified the parameters and fully checked the voltage with the power supplier.
2. Reset circuit logic issue. There is currently no reset circuit connected, it is due to the resistor being pulled high. Do we need to separate two TPS3802 according to the EVM board?
3. Do I need to set master-slave when two amplifier chips are on the same board?
4. Is the input signal too large? Plan to modify the input circuit limit.
Based on the above, please help check the circuit and provide optimization suggestions.

5557.SCH.pdf

  • 0
    TI__Expert 5875 points

    Hello,

    The schematic itself looks good. Based on your comments, it seems like the issues you have been having are power supply related. I would recommend using the Master/Slave configuration by using the OSC pins to help reduce stress on the power supply. This app note will give you the information you would need for this change. It is fine to use one TPS3802 in your configuration since both devices have the same power supply. 

    The input signal must be kept to a maximum voltage swing of +/-2.8V. With the gain configuration you currently have this means keeping the rms input level to about 2V or below.

    Regards,

    Ramsey