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关于LDO Ripple rejection的一点疑问

Other Parts Discussed in Thread: LM1085

看数据手册的时候 看到Xc should be euqal to R1 at ripple frequency。我想知道,如果我LDO输入的噪声是500K的,那么我这边f设置成500k附近呐还是说设置的越低越好。因为 看到频率低的时候纹波抑制比很高。这里希望TI的工程师帮忙解释下,如果我LDO输入端噪声500K,那我设置成500K附近还是越低越好。