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TI的半桥集成MOS CSD87353和CSC87350建议工作的占空比

Other Parts Discussed in Thread: TPS40322

最近在做一款12V转3.3V的以及12V转5.0V BUCK。IC选的的TPS40322交错,根据demon,初步选定的MOS管是CSD87353;不过采购反馈下来,这颗料不是太好购买。我们打算使用CSD87350来替代;

仔细看了下CSC87350的规格书,发现有“low duty applicaitons”的描述;

TI的选型页面上也有duty cycle Low和high的区别。

请问,这种在TI的中集成MOS为何会有这个要去求?low和high的范围是多少 ?替换的话,会有什么后果?