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电源芯片tps54620问题咨询

Other Parts Discussed in Thread: TPS62160

使用了5片Tps54620RGYT分别供电,其中输入电压都是5V,分别转换为3.3V、1.8V、1.35V、1.2V和1.0V电压输出,上电后5片芯片都没有电压输出,不知道是为什么?附上原理图帮忙看看,感谢!