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要求输入2-12，输出12，输出电流0.3A，设计电路输出不能升压。
亲；你现在的参数设置是输出4.9V，如果输入超过5V；反馈因饱和而无法调节，输出将随输入而变。
这是“直流分析”测出来的，不是设置的
