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LM5168: 我设计了LM5168的DCDC,但是为什么不能够正常输出设计电压,请各位老师帮忙看一下,存在什么问题?

Part Number: LM5168


设计的3V,只能输出2.2V左右,VFB只有0.7V左右,没有上升到1.2V。

VIN输入20V电压,EN输入5V电压。