空载情况
1 输入电压低于3.5v的时候， out- out+ 输出值是-3.5v和3.5v， 输入电压调低输出电压也变低。
c1- c1+ 波形
2 输出电压高于3.6v的时候 out- out+ 输出值是 -1.6v 和3.6v， 输入电压5v lm277612 电流从0.01a 增加到 0.5a。
c1- c1+ 波形 
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