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TPA3111D1 的使用问题

目前我们的audio功放芯片采用TPA3111D1PWPR,配合4欧5W的喇叭,将功放芯片输出功率限制在5W或者10W,都会出现fault低电平的情况。

    接法如下:

请帮忙解决此问题.

  • FAULT 引脚
    Open drain output used to display short circuit or DC-detect fault status. Voltage compliant to AVCC. Short circuit faults can be set to auto-recovery by connecting FAULT pin to SD pin. Otherwise both short circuit faults and DC-detect faults must be reset by cycling PVCC.
    不一定是过载保护, 电源电压波动太大也可能引起的. 这可能跟你的供电电源有关, 也跟布板有关, 慢慢查吧
  • 您好,fault拉低,然后能自动恢复吗?芯片内部集成保护电路,当芯片处于过热,输出短路,输出差分波形有DC offset或者duty cycle不一致的时候都会报警拉低。 所以要从这这几方面入手去检查,是什么原因导致fault。

    芯片发烫吗?thermal pad是否铺铜接地提高散热? 测量下输入输出看下波形情况?