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TPS54331EN脚问题

Other Parts Discussed in Thread: TPS54331

您好,我用贵公司的TPS54331做了一个可控开关电源,但是EN脚不管是置高电平5V ,还是置空,就算是直接接地,也就是0V,低于1.25v了,TPS54331还能正常工作(输出端电压 和 高电平或者置空的时候一样,而且电压可以通过电阻调节),这是怎么回事?