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LMR16010输出15V,空载时纹波太大?

Other Parts Discussed in Thread: LMR16010, LMR16006, TPS54160, TPS54060

焊接了LMR16010及相关电路,没有焊接后续负载。发现输出能够达到15V, 不过纹波太大,如附图,都有过500mV. 目前配置开关频率L=100uH, Cout=100uF. 

Cout换成470uF 纹波变小,但还是有100mV左右的幅值。Cout是安装datasheet介绍计算的,应该没问题。

 请问提高开关频率会好点吗?目前是500K的频率。谢谢各位给点意见。