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LM2611 输出-5V电源纹波问题

Other Parts Discussed in Thread: LM2611

如图所示,原理图设计的时候选的是LT1931,后来发现太贵了就直接用LM2611替换的,

测试过程中发现如下问题:

1. C383为1uF/50V X7R陶瓷电容,输出-5V的纹波在200mV,呈正弦波形式。

2. C383更换为4.7UF/50V之后,输出的纹波没有这么大了,能够控制在50mV了。

那么,请问两处电感和Ccuk电容的值应当如何计算,感觉参考值给的不是很准。