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调试LM27762时，电源电压大于约2.7V时，-2.5V电压无输出。比如电源输入为3.3V，此时测量-2.5V无输出，将输入电压调低到约2.7V时，-2.5V开始正常输出，再将输入电压调高（小于5V）时，-2.5V输出能够正常维持。这是什么原因
