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Hi
电路你可以借助TI官网:http://www.ti.com.cn/product/cn/LM5118 上webench仿真确认。
纹波偏大,你需要确认电路输出电容,环路补偿,甚至layout.
其次你需要注意测试,从波形看,你的测试看起来是有问题的,具体看附件。