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多路DC-DC并联输入电容的选择

Other Parts Discussed in Thread: LM2696

假如输入是DC-20v,输出是5v 12v  15v  我用了三个lm2696芯片,这时候我的输入电容该怎么选择,是按照单路的方法选择三个输入电容呢,还是用一个就可以?

容量大小该怎么选择?