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TPS53318输入正常,无输出

按照图中原理图设计制板后,12V转换3.3V失败,输入正常,EN管脚输入为1.5V,VREG管脚输出为5V,无输出。

麻烦各位有经验的前辈给予建议与指导,谢谢各位。