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AMC1200 原边电源供电

Other Parts Discussed in Thread: AMC1301, AMC1200

上图为数据手册中典型应用电路,不懂原边侧GND1为何没有一个地的接入点,其floating power supply 是一个独立电源。一个与地之间无低阻通道的浮点的电源怎么做到提供供电,我找了两个隔离的电源通过做相同的连接不能如图意所示,请TI指教