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帮忙看下LM5642X的纹波峰值电流怎么计算。

Other Parts Discussed in Thread: LM5642X

目前我在使用LM5642X的芯片,我想计算纹波电流的峰值,根据datasheet上的公式,我算出来的值是负的。我的占空比D是使用VO/VIN计算的。我电路的实际情况是芯片输入电压时18V,channel 1输出电压时12V,4A,channel 2输出电压时5V,3.5A,请帮忙看下是什么问题。