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UCD9222+ucd7242输出为0,急!!!!

Other Parts Discussed in Thread: UCD9222

大家好,我采用了和6678开发板一样的供电方式,但是在我向UCD9222中写入配置程序,就是TI开发板提供的UCD9222工程文件后,将PG2使能,请问为什么电压输出还是0,通过FUSION软件查看到duty一直=0,请问如果想产生电压,还需要拉高什么使能脚之类的吗?请专家指教,急!!