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TPS92515 数据手册中,最小输入电容计算公式似乎有误?

计算结果是负数,并且将案例中的数字代入得出的答案数字对不上。
分母是输入电压纹波是么?分母越小计算出的答案的绝对值越大,此外被减数:【频率的倒数】单位是秒,然而例中减数的单位是微秒。有点无法理解……难道算出的答案真是负的?那怎么转换成电容大小?