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请分析下这个恒流源电路

Other Parts Discussed in Thread: AM4378

参考am4378的GPEVM液晶背光电路,使用TPS61081

在TPS61081的手册中找到类似的典型电路:

但是对其原理不是很了解,主要在于:为什么这样设计它就是恒流源了,另外输出电流与PWM占空比的定量关系是怎样的