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tps61089使能引脚关断不了

Other Parts Discussed in Thread: TPS61089

tps61089采用锂电池供电3.7V-4.2V之间,输出为5V,使能管脚高电平是输出为5V,使能管脚是低电平是为3.6V左右,关断不了

  • Hi
    内部整流管并非背靠背,所以即便芯片关断,输入,电感,以及MOS寄生体二极管,输出仍会形成通路,所以输出在芯片关断仍然有电压是正常的。
    如果要使能低时输出没有电压,你需要选择带关断功能的芯片或者外部额外增加关断功能的电路。