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请问lm5116到底怎么用啊,求帮助

Other Parts Discussed in Thread: LM5116

本来想设计一款输出最小12伏,最大36伏,输出5伏的降压转换器最大输出电流3安培,于是用了lm5116,webench推荐设计如下

下图是我自己的电路,接线除了使能端都一样,使能端串一个一兆欧的电阻接到电源,时间仓促临时用图表示一下

测试时,就是电路输出只有3伏左右,还不稳,调整滑变电压也不变请问应该是哪有问题,还有补偿电路的值到底怎么取,数据手册也没有明确的计算公式