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TPA3138D2没有信号输出

Other Parts Discussed in Thread: TPA3138D2

Hi TI,

我们现在系统设计用到TPA3138D2,使用CPU的GPIO(GPIO电平是1.8V加了5V的电平转换)来控制SD/FAULT脚,测量SD/FAULT电压一直在跳变;后来吧SD/FAULT直接加100K上拉到PVCC,系统还是没有信号输出,测量SD/FAULT的波形发现每隔1.6S拉高一次,是否是触发的DC-detect,怎样消除DC-detect?TPA3138D2有上电时序的要求吗?是否需要有输入时才能打开SD/FAULT?谢谢!