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Updated: July 8th, 2008 05:26 PM CDT

National Semiconductor Announces Highly Integrated, High-Brightness LED Drivers With Wide Input Voltage Range for Industrial and General Illumination Applications

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Technical Features of the LM3405A LED Driver

The new LM3405A extends the voltage range of National's previouslyannounced LM3405 up to 22V. Offered in a tiny 6-pin SOT-23 package, theLM3405A constant-current buck regulator delivers up to 1A of current to drive3W or 5W LEDs. With a 0.2V reference voltage for constant-current feedbackcontrol, internal compensation and a fixed 1.6 MHz switching frequency, theLM3405A provides a simple, highly-efficient solution for driving LEDs. TheLM3405A also includes an EN/DIM pin for pulse-width-modulation (PWM) dimming.The LM3405A drives general illumination for industrial and commercial lightingapplications from the 12V AC and 12V DC rail.

For more information on the LM3405A and LM3405 or to order samples and anevaluation board, visit http://www.national.com/pf/LM/LM3405A.html andhttp://www.national.com/pf/LM/LM3405.html.

For more information on National's lighting solutions, visithttp://www.national.com/led.

About National's Power Management Products

National solves power management design problems in space- andenergy-constrained applications from feature-rich handheld devices throughlarge line-powered systems. From the novice power designer to the powerexpert, National's products, people and design tools enable customers todesign green-powered systems with complex power supplies in the shortestamount of time. High-performance products include switching regulators such asNational's flagship SIMPLE SWITCHER(R) family, and application-specificproducts including white-LED drivers and Power-over-Ethernet controllers. Moreinformation about National's power management products is available athttp://power.national.com.

Availability and Pricing

Available now, the LM3401 is priced at 75 cents each and the LM3405A is$1.30 in 1,000-unit quantities.


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