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有个技术问题要请教一下各位大神,按照TPA3251 的PDF线路图做的,但是有三个引脚不知道要如何应用。

Other Parts Discussed in Thread: TPA3251

TPA3251的PDF线路图按照用户指南做的,但是有三个引脚   19   / 20   /21   不知道外部连接 要如何引用。  请各位大神指点一下。多谢!!!