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UCC2897A做电源变压器辅助绕组问题

Other Parts Discussed in Thread: UCC2897A

各位大神好:

 我在TI网站上下载的UCC2897A应用的一个实例,PMP5426这个开关电源,看不懂辅助绕组给芯片供电的电路,能不能给解释下啊。或者说这个供电回路有什么名称?谢谢啦