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28V转24V,刚开始以为是级联导致电压比显示的28v大，但是我们把24V后面的断开，只留一个28转24工作了五六秒也烧了,请问这是什么问题 ？
您好，推荐您使用官方的设计工具Webench进行设计和故障排查，另外原理图中没有看到地盘连接情况，需要大面积接地，详情参见webench提供的原理图和PCB.
https://webench.ti.com/power-designer/switching-regulator/customize/303?VinMin=28&VinMax=28&O1V=24&O1I=3&base_pn=TPS54335A&AppType=None&Flavor=NA&op_TA=30&origin=pf_panel&lang_chosen=zh-CN&optfactor=3&Topology=Buck&flavor=NA&VoltageOption=NA
