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LM337使用时输出纹波过大,哪位大神帮忙解决下?

Other Parts Discussed in Thread: LM317, LM337

本人绘制了一块常用稳压电源电路板,其中有7805,7905,7815,7915,LM317和LM337电源芯片。前五种输出特性良好,交流测试所得纹波均小于10mv,但LM337输出的纹波在200多毫伏左右,且为较标准的锯齿波,其频率也随着每次电源上电的变化而变化。我更换了多种滤波电容,更换了多块LM337芯片,均未解决该问题。本人在此恳请哪位大神出道相助了。。。。