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TPA3251上电后一直不停的"嗒嗒嗒嗒"(间隔约400ms)不能正常工作，断开音频输出的反馈后也是如此。
电源20V，负载4欧，模式BTL；原理图如附件；
请帮忙分析下是哪里的问题，谢谢！TPA3251_sch.PDF
