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LM25117 仿真电流波形中采样和保持直流电平如何理解?

Other Parts Discussed in Thread: LM25117

LM25117 仿真电流波形,规格书中讲是由两部分构成的,一个是斜坡电流是SW通过电阻,电容而来的。另一部分是由采样电阻Rs而来的,但是这个电流是是一个梯形波,是如何得到一个直流电平的,这个直流电平的值是多少?