- LM5118设计一个9-36V输入,输出12V/3A的DCDC,遇到在24V以上12V不能带载情况。以下是26V输入测试SW和VOUT的波形。附件是原理图Schematic Prints.pdf
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看了你的原理图,可能是环路问题,建议你用WEBENCH优化电路参数,主要是comp管脚的参数
另外,推荐个料给你LMR14020,可以对比下MP4459,外围器件更少