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Maxim 公司的MAX16841是帶平滑調光并有最大化效率的離線（100V, 120V, 220V, 和230V AC)LED驅動器，并提供有源功率因素修正（PFC），既可用于隔離（如反激）和非隔離（如降壓）配置。MAX16841采用恒定頻率控制技術以得到最大化的效率，通用輸入電壓90V 到264V AC，主要用在帶TRIAC調光的LED燈，通用輸入LED燈，工業和商業照明，住宅區LED照明等。本文介紹了MAX16841主要特性，方框圖，非隔離（降壓）和反激拓撲圖，以及反激和降壓與降壓-升壓LED驅動器電路圖。 Offline LED Driver Provides Smooth Dimming and Maximizes Efficiency The MAX16841 is an LED driver for AC line (100V, 120V, 220V, and 230V AC) input lamps. It features proprietary control of the input current that allows lamps to dim smoothly from full to zero light intensity, while providing active power factor correction (PFC). It is a very flexible product that can be used in isolated (e.g., flyback) and nonisolated (e.g., buck) configurations. The conventional use of an optocoupler in isolated configurations can be avoided in MAX16841-based designs. The constant frequency-control technique of the device allows maximization of the conversion efficiency at both low and high AC line by operating at the conduction mode that minimizes total conduction and switching losses. The device can be configured for universal input (90V to 264V AC) dimmable applications, allowing the design of an LED lamp that can be operated and dimmed worldwide. This device can be used without electrolytic capacitors, thus maximizing the lamp lifetime. In this case, the LED current is a rectified sinusoid with a frequency that is twice the AC line frequency. The device also features thermal shutdown, current limit, open LED protection, and VCC undervoltage lockout. The MAX16841 is available in an 8-pin SO package and operates over the -40NC to +125NC temperature range. MAX16841主要特性： Smooth Dimming with Leading-Edge (Triac) and Trailing-Edge Dimmers Active Power Factor Correction Nonisolated (e.g., Buck) and Isolated (e.g., Flyback) Topologies Universal 90V to 264V AC Input Range Constant Frequency-Control Scheme Maximizes Efficiency at High and Low AC Line Voltage Constant Power Control with No Need for Optocouplers Very-Low Quiescent Current Output Open and Short Protection Thermal Shutdown Available in an 8-Pin SO Package MAX16841應用： Retrofit LED Lamps with Triac Dimming Universal Input LED Retrofit Lamps Industrial and Commercial Lighting Residential LED Lighting 
圖1。MAX16841方框圖
圖2。MAX16841非隔離（降壓）拓撲圖
圖3。MAX16841反激配置圖
圖4。MAX16841反激LED驅動器
圖5。MAX16841降壓LED驅動器
圖6。MAX16841降壓-升壓LED驅動器 詳情請見： 
MAX16841[1].pdf
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