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焊接时PwPd没有接地，按附件图示连接用示波器测不到输出电压，请问这是怎么回事？初来乍到，请高手指教，谢谢！
那个一般主要是散热吧，有的芯片内部没有接地，需要那个引脚与地相连
你好，请焊接PWpd测试，有的芯片有电气连接的，谢谢。
