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LM337使用问题

Other Parts Discussed in Thread: LM337

各位,好

             在使用LM337产生负压应用中,输入-5V,输出-2.5V,在输入端加CRC滤波,R=10Ω,C=10UF,测试发现5V电压经过电阻后变为4.2V(按理输入输出压差满足要求,不会对输出产生影响),但是Vref电压由1.25V,变成1.17V,去掉10Ω后正常为1.26。请帮忙分析下原因,谢谢!