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关于LM5576使用中的问题,急待解决?



我用LM5576设计了一个电源电路,5V输出的,按照数据手册上的参考电路设计的,元器件用的都一样,焊好板后第一次测试,输入电压8~32V,输出都是标准的5V,但摆了几天后再来测试,发现输出变成了6.5V,测子2块板都是如此,不解???????????