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按照ti推荐电路设计,tps564208 12-5v 上电烧毁,现象5v跟gdn短路

Other Parts Discussed in Thread: TPS564208

空载,上电就烧毁了,测试三块板子都一样,换新的芯片也一样

TPS564208 做12-5V&3A DC-DC电源转换
WEBENCH推荐电路
实际使用电路
PCB布局
现象,上电后SW GND短路