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关于UCD3138A的LLCEVM150中一个VIN_MON检测的问题



如图的VIN_MON端口,其作用是什么呢?这个端口只能放在辅助电源的次边输出端吗? 辅助电压是变化的,次边输出一直稳定在一个值,这个电路是怎么检测输入电压的呢?