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LM22678烧管子

Other Parts Discussed in Thread: LM22678

TI的工程师你们好,最近在用LM22678,输入27-38V,输出27V,原理图和PCB如下图所示,可是Vin=35V时,负载1K,无输出,电表测量结果显示SW脚以对地短路,这是为什么呢???