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TPA3116功放芯片一开始工作正常,能输出音频信号,工作一段时间后,不能正常输出信号,检测到芯片故障引脚为低(个人认为是芯片自身检测到输入信号中的直流偏置保护了),而且很难恢复正常。求解答:如何能让功放芯片电路正常稳定的工作。