Maxim MAX16841最大化效率离线LED驱动解决方案

关键词： LED驱动 , MAX16841 , Maxim , 离线

Maxim 公司的MAX16841是带平滑调光并有最大化效率的离线（100V, 120V, 220V, 和230V AC)LED驱动器，并提供有源功率因素修正（PFC），既可用于隔离（如反激）和非隔离（如降压）配置。MAX16841采用恒定频率控制技术以得到最大化的效率，通用输入电压90V 到264V AC，主要用在带TRIAC调光的LED灯，通用输入LED灯，工业和商业照明，住宅区LED照明等。本文介绍了MAX16841主要特性，方框图，非隔离（降压）和反激拓扑图，以及反激和降压与降压-升压LED驱动器电路图。

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应用：

Retrofit LED Lamps with Triac Dimming

Universal Input LED Retrofit Lamps

Industrial and Commercial Lighting

Residential LED Lighting

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图1。MAX16841方框图

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图2。MAX16841非隔离（降压）拓扑图

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图3。MAX16841反激配置图

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图4。MAX16841反激LED驱动器

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