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TL431的使用问题!!!

Other Parts Discussed in Thread: TL431

TL431的技术手册上说电阻R15要保证提供大于1mA的电流给TL431的阴极,但我用6K的电阻时,输出的5V电压最负责的变化有波动,用15K的就没有波动的问题。也用了其他阻值,都有波动问题。这是为什么?如果用15K的电阻,那个1mA的基本工作电流根本不能保证,反而工作稳定!!!一直搞不明白,急求解答!!!