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TPS5430参考设计中的谐振频率问题

Other Parts Discussed in Thread: TPS5430

在用TPS5430作bulk设计时,在求取输出电容值时,手册中的参考设计指出,对于陶瓷输出电容,推荐谐振频率Flc不超过7kHz,而对于铝电解电容的推荐谐振频率为不超过5kHz。请问这个推荐的谐振频率从何而来??