UCC28730隔离式反激电源控制器无需使用光耦合器即可提供恒定电压(CV)和恒定电流(CC)输出稳压，并且具有唤醒信号检测功能，可改善大型负载阶跃瞬态相应。此篇主要介绍了UCC28730特性、应用范围、参考设计电路以及电路分析，帮助大家缩短设计时间。
UCC28730特性：实现(<5mW)待机功耗；智能检测实现最小的输出电容；700V启动开关；针对MOSFET的钳制栅极驱动输出
UCC28730典型应用范围：消费类电子产品适配器和充电器；TV和监视器电源；备用和辅助电源；家用电器和工业自动化SMPS
UCC28730参考设计应用电路：
图1UCC28730内部结构图
The UCC28730 is an isolated-flyback power supply controller which provides accurate voltage and constant current regulation using primary-side winding sensing, eliminating the need for opto-coupler feedback circuits。The controller operates in discontinuous conduction mode with valley switching to minimize switching losses.
图2UCC28730参考设计图
The UCC28730 includes features in the pulse-width modulator to reduce the EMI peak energy at the fundamental switching frequency and its harmonics. Accurate voltage and current regulation, fast dynamic response, and fault protection are achieved with primary-side control. A complete charger solution can be realized with a straightforward design process, low cost, and low component-count.
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