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PMIC上的电源反馈脚为何接入不同的电源



在TDA4VE_AL_VL    EVM 参考设计中, 原理图PMIC-A(TPS65941421RWERQ1) PIN 49脚 ,FB_B3返馈信号引脚 为何连接在其它电源网络VDD_MCUIO_EVE,

能否帮解说下这块电路的工作原理。