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也就是说LM393的Vin+为427mV,V-为200mV对吧？这样的话，V+ 和V- 都在输入共模电压范围内，但是V+>V-，输出应该为高阻态。所以达不到您所说的高电平。LM393是一款开漏输出的比较器，因此输出需要上拉才能输出高电平。 对于应用的集中情况，datasheet中有列出：1. When both IN- and IN+ are both within the common-mode range:
a. If IN- is higher than IN+ and the offset voltage, the output is low and the output transistor is sinking
current
b. If IN- is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is
not conducting
2. When IN- is higher than common-mode and IN+ is within common-mode, the output is low and the output
transistor is sinking current
3. When IN+ is higher than common-mode and IN- is within common-mode, the output is high impedance and
the output transistor is not conducting
4. When IN- and IN+ are both higher than common-mode, the output is low and the output transistor is sinking current。
