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占空比于芯片内部开关管电流限制的关系?

Other Parts Discussed in Thread: TPS55340

对于内置开关管的开关电源芯片,它工作时的占空比与内置开关管的最大电流限制有何关系?为什么好多说明书给出的电流限制都是在最大占空比时的值?如果占空比变小,会对电流限制有影响吗?