NCL30083 是一款 PWM 电流模式控制器，适用于隔离反激和非隔离恒流拓扑。该控制器以准谐振模式运行，效率极高。得益于新颖的控制方法，该器件能够精确调节来自初级侧的恒定 LED 电流。这样就无需使用次级侧反馈电路、偏置电路和光耦合器。该器件高度集成，外部元件数量极少。内置一套强大的安全保护措施，可简化设计。该器件专门用于非常紧凑、节省空间的设计。它支持分步调光，通过监控交流线路并检测用户何时开启-关闭-开启线路，以 5 步降低光强度，直至调光 5%。

The NCL30083 is a PWM current mode controller targeting isolated flyback and non-isolated constant current topologies. The controller operates in a quasi-resonant mode to provide high efficiency. Thanks to a novel control method, the device is able to precisely regulate a constant LED current from the primary side. This removes the need for secondary side feedback circuitry, biasing and an optocoupler. The device is highly integrated with a minimum number of external components. A robust suite of safety protection is built in to simplify the design. This device is specifically intended for very compact space efficient designs. It supports step dimming by monitoring the AC line and detecting when the line has been toggled on-off-on by the user to reduce the light intensity in 5 steps down to 5% dimming.