Products, Materials & Tools | Jun 07, 2011

National Semiconductor’s High-Brightness LED Driver Simplifies Area-Lighting Design

National Semiconductor Corp. today introduced the LM3466, a highly integrated linear LED driver that simplifies the design of high power, wide area lighting fixtures such as streetlights. The LM3466, with just a few passive components, provides a complete system that drives each LED string from any off-the-shelf AC/DC constant-current power supply.

LED drivers today often require multiple components to accurately drive a string of LEDs. In addition, maintaining equal currents among LED strings results in a complex design.

National’s LM3466 solves these problems by integrating a MOSFET and utilizing a unique control scheme.

The high level of integration enables a basic design of just one LM3466 along with one resistor and one capacitor to drive a string of LEDs. A complete fixture can be constructed by repeating the strings in parallel.

A unique dynamic current equalizing control scheme enables communication between each LM3466 LED driver to divide current equally or ratiometrically amongst multiple active LED strings. No binning of the LEDs is required. During an open (inactive) string state, each LM3466 automatically equalizes current throughout remaining strings to maintain relatively constant output power.

Technical Features of National’s LM3466 LED Driver
National’s LM3466 linear LED driver integrates a 70V, 1.5A N-Channel MOSFET and features a wide input range of 6V to 70V. LED strings with maximum stack voltages exceeding 70V may be driven with minor changes to the external components. The LM3466 includes a fault status output, input under voltage lockout, current limit and thermal shutdown protection. Linear circuitry wards against any EMI and ensures compliance to the EN 55015 EMC standard or other regional EMC regulatory requirements. Each LM3466 conducts a current up to 1.5A. Communication between the LM3466 and constant current power supply is not required, nor is LED voltage binning. The LM3466 operates with minimal overhead voltage to maximize electrical efficiency. System output power is maintained even for any number of open strings.

About National Semiconductor
National Semiconductor is a leader in power management technology. Known for its easy-to-use analogue integrated circuits and world-class supply chain, National’s high-performance analogue products enable its customers’ systems to be more energy efficient. Headquartered in Santa Clara, Calif., National reported sales of $1.42 billion for fiscal 2010.

FEATURED

MOSO High Reliable & Flexible Programmable Outdoor LED Driver

MOSO High Reliable & Flexible Programmable Outdoor LED Driver MOSO, one of the most influential and well-known new energy enterprises in China, dedicates to provide the efficient, intelligent and safe outdoor LED power supply solutions by introducing its programmable LDP series worldwide. Read more »

FEATURED

Cree Launches Industry’s First Extreme Density LED

Cree Launches Industry’s First Extreme Density LED Cree announces the new XLamp® XD16 LED, the industry’s first Extreme Density LED, which delivers up to 5½ times higher lumen density than Cree’s previous generation of high power LEDs. The XD16 LED combines breakthrough lumen density, low optical cross-talk, unsurpassed thermal contact and ease of ... Read more »

FEATURED

Lumileds Delivers up to 48% Higher “Punch” than Competitors

Lumileds Delivers up to 48% Higher “Punch” than Competitors Lumileds introduced today the Luxeon CZ Color Line, a product line optimized to deliver maximum punch. “The Luxeon CZ features up to 48% higher punch than any other undomed color LED,” said Jennifer Holland, Product Line Director of the Luxeon Color Family. To meet the recent market trend of color ... Read more »

FEATURED

LIFUD High Bay LED Driver & Smart Sensor

LIFUD High Bay LED Driver & Smart Sensor LIFUD just launched her second generation of high bay driver, LF-FHB series. It can be completely turned OFF even without cutting off the AC power. When the second generation of LF-FHB series works with a smart sensor (= microwave sensor + light sensor) which was developed by LIFUD R&D, the light ... 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