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如何根据热阻计算DC-DC的最大输出电流?

Other Parts Discussed in Thread: LM43600

最近在用LM43600,我的输入是22V,输出是3.3V,我如何根据热阻来计算最大输出电流是多少?LDO可以根据热阻很快计算出最大输出电流,但是DC DC

是开关型的,不知道怎么计算比较准确点?