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如何用普通的DC-DC控制器做LED恒流驱动器

Other Parts Discussed in Thread: TPS40193, TPS40057, TIDA-01234

比如用TPS40193,TPS40057之类的DC-DC控制器加电流采样来做反馈,做成LED恒流驱动器,需要注意哪些问题?