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LM26003 EN 使能问题

Other Parts Discussed in Thread: LM26003

请问我用LM26003做的12-5v 电源,当EN 端接去MCU 控制,拉低到0v后,输出端仍然有4.2v电压输出。拉高1.8v时输出大概4.95v, 如果EN 脚悬空就能正常5v输出 请问什么原因?电路是参考官方的设计。谢谢指点, 急急急