Products, Materials & Tools | Oct 24, 2011

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, which allows lamps to dim smoothly from full to zero light intensity, while providing active power factor correction.

It is a very flexible product that can be used in isolated (e.g., flyback) and nonisolated (e.g., buck) configurations, providing in both cases accurate setting of the output current with no need for opto-couplers.

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 the total of 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 operate and can be dimmed worldwide.

This product 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. It operates over the -40°C to 125°C temperature range and is available in an 8-pin SO package.

Key Features:
• Smooth Dimming with Leading (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 Optical Couplers
• Very-Low Quiescent Current
• Output Open and Short Protection
• Thermal Shutdown
• Available in an 8-Pin SO Package

Preliminary datasheet can be downloaded here

About Maxim Integrated Products:
Maxim Integrated Products, a two billion dollar company, designs and manufactures ICs for analog and mixed-signal applications. The company's broad portfolio of 28 product categories is among the industry's deepest, with over 5400 products.

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