Products, Materials & Tools | Feb 09, 2011

Linear's New Isolated Active PFC Off-Line LED Controller without Opto-Isolator is TRIAC Dimmable

Linear Technology announces the LT3799, an isolated LED controller with active PFC, specifically designed for driving LEDs from a universal input range of 90 VAC to 265 VAC. The LT3799 is optimized for LED applications requiring 4 W to over 100 W of LED power and also compatible with standard TRIAC in-wall dimmers. The controller's unique current sensing scheme delivers a well regulated current to the secondary side without using an opto-coupler.

Features:
• Isolated PFC LED Driver with Minimum Number of External Components
• TRIAC Dimmable
• VIN and VOUT Limited Only by External Components
• Active Power Factor Correction (Typical PFC > 0.97)
• Low Harmonic Content
• No Opto-Coupler Required
• Accurate Regulated LED Current (±5% Typical)
• Open LED and Shorted LED Protection
• Thermally Enhanced 16-lead MSOP Package

Applications:
• Offline 4W to 100W+ LED Applications
• High DC VIN LED Applications

This not only reduces cost but also improves reliability. It's single stage PFC regulator design requires minimal external components. Additionally, it's thermally enhanced MSOP-16E package ensures a simple and compact solution footprint for off-line LED applications.

The LT3799 offers over 86% efficiency, eliminating the need for external heat sinking of the LED driver IC in most applications. Special internal circuitry provides active PFC of up to 0.977, easily meeting industrial Department of Energy (DOE) requirements while also complying with the IEC 61000-3-2 Class C Lighting Equipment Harmonics requirement.

The LT3799 can be used with a standard in-wall TRIAC dimmer without any visible flicker. Open and shorted LED protection ensures long-term reliability for a wide range of LED applications.

About Linear Technology:
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule™ products, and many other analog functions. Applications for Linear Technology’s high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com/.

FEATURED

High Volume Laser Diode and VCSEL Testing

High Volume Laser Diode and VCSEL Testing Hitherto established measurement technologies for laser diodes – such as dispersive scanning spectrometry and Fourier-transform infrared spectroscopy (FTIR) – can react sensitively to a production environment. High-resolution array spectroradiometers are effective alternatives that offer multiple ... Read more »

FEATURED

Luxeon V2, the Best Choice for a 2 mm² High Power LED

Luxeon V2, the Best Choice for a 2 mm² High Power LED Lumileds announced breakthrough high power performance with the new Luxeon V2 LED. With the highest performance in its class for output and efficacy, the emitter easily enables DLC Premium performance at the system level. Luxeon V2 utilizes a 2 x 2 mm Chip Scale Package (CSP) in a 3.5 x 3.5 mm ... Read more »

FEATURED

The 22nd China (Guzhen) International Lighting Fair

The 22nd China (Guzhen) International Lighting Fair China (Guzhen) International Lighting Fair is based in China Lighting Capital- Guzhen Town, where thousands of lighting manufacturers lies and is dubbed as the source of lightings. With the help of local government and UBM, the fair has been successfully held for 21 editions. Read more »

EDITORIAL

High Conductive Foils Enabling Large Area Lighting

High Conductive Foils Enabling Large Area Lighting Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP as one of the leading partners for research and development for surface technologies and organic electronics and Sefar AG, a leading manufacturer of precision fabrics from monofilaments, developed a roll-to-roll ... Read more »

page_peel