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我使用LM25118提供的spice模型进行仿真，输入电压30V，通过DAC控制调节FB端来改变输出电压1-16V之间变化。大约在设定输出电压为4V左右时输出的实际电压振荡较大，在其它区段都相对比较稳定。请问是为什么，能怎么改进来减少这种不稳定？
