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TPS54040: 输出电压偏低

Part Number: TPS54040

您好!我现在使用TPS54040做24V转5V电路设计,原理图及参数如下图,但是输出电压很低,使用DC电源供电,显示电流极小甚至没有:实测BOOT和PH引脚处电压分别为3.5V和1.8V,请问如何处理,谢谢!