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请问用TI的lm2841或者2842的芯片，datasheet上面给的电路图比如输入12V输出5V的话，那么输入电压降低时，输出电压会成比例的降低还是一直保持着5V的输出（保持电路图不变的话）吗？希望可以得到大家的帮忙，谢谢。
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