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请教TPS543C20各种GND连接

Other Parts Discussed in Thread: TPS543C20

TPS543C20  datasheet管脚定义中有三种GND,分别为PGND(Pin13~Pin20)、GND(Pin27)、AGND(Pin29),请问这三种GND如何设计?原理图上可以直连一起吗?PCB设计的时候需要有什么特别注意的吗?请教!!!