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LM5117电感选型问题

Other Parts Discussed in Thread: LM5117, LM5117QUICK-CALC

lm5117,做成一个输出5V3A,12V3A,20V3A的电源,输入电压为40~55V。共用一个功率电感。之前采用的电感是33uH。但是在调试的时候,使用33uH的电感,输出电压为20V的时候,带载电流只有0.5A,无法满足3A的要求。后来将电感改成4.7uH,刚全部能满足要求。我想问问,为什么使用4.7uH的时候,能满足三个电压的带载能力要求。能否从理论上加以说明。可否出一份这样的报告给我们?