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TPS2373: 关于VC_IN引脚的接法

Part Number: TPS2373

我想设计一个非隔离的48V(POE)转12V/4A电路。没有隔离变压器,所以VC_IN引脚也就没有TPS2373 datasheet参考电路的那种接法。
我理解的TPS2373上电流程是:
TPS2373协商成功,在VDD和RTN之间出现稳定的48V——>
PG输出低电平,使外部DC/DC启动工作——>
DC/DC电路输出12V,这个12V既给负载供电,也反馈到VC_IN,使TPS2373内部正常工作

请问:
1-我的理解正确吗?
2-下面绿色方框内的电路连接正确吗?