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哪位大佬帮我介绍一下TL4242这个芯片的原理?

Other Parts Discussed in Thread: TL4242

以下图片是TL4242 LED驱动芯片的功能框图,搞不清楚他的工作原理,有没有大佬说明一下,谢谢了。这是三极管做开关?还是MOS做开关?

越详细越好~实在感谢~