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求解答

Other Parts Discussed in Thread: TPS54540

各位好,我是新手,在这里想请教个问个,我现在在用TPS54540电源芯片,实现28V转5V的功能,有个问题就是在TPS54540工作的时候(EN端悬空,电压是2.4V),输入端28V变成了5V,电源的输出电压本来应该是5V,现在变成3V,把ENE端拉低为低电平,输入端电压就变成了28V,测得BOOT端电压是6.7V,希望得到各位高手的帮助,谢谢!