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LM5117做恒流电源无法恒流

Other Parts Discussed in Thread: LM5117

我用LM5117 做一款恒流电源,输入电压9V~15V,输出40A恒流,输出电压范围3V~6V,现在在恒压状态下电流29A时工作正常(我电子负载最大才30A工作电流),但我把CM端口的平均电流转换后去控制FB脚,当电流接近恒流点(25A)时,FB信号极不稳定,导致工作无法正常!!!请大侠们指点下,感谢感谢!!