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你好： 最近使用了贵公司的一款HUB芯片TUSB2046BI 出现了二个问题，1接上PC端，一直弹出来一个端口电涌。2插上外部设备，设备端供电的5V马上断开。找了几天不知道什么原因，电路是参考官网的。
