High-brightness LED driver focuses on simplifying area-lighting design
June 06, 2011 // Paul Buckley
National Semiconductor has introduced 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 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.
National's LM3466 linear LED driver integrates a 70 V, 1.5 A N-Channel MOSFET and features a wide input range of 6 V to 70 V. LED strings with maximum stack voltages exceeding 70 V 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 1.5 A. 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.
Samples are available now with production quantities in July 2011.
The LM3466 LED driver is offered in an 8-pin ePSOP package and priced at $1.30 each in quantities of 1,000.
More information about the LM3466 LED driver at
Apple iCar: Do iCare?
August 27, 2015
Whether its creators call it ‘iRod,' 'iMove" or ‘iCar,’ Apple has launched a pedal-to-the-metal drive into the automotive ...
TSMC pulls plug on solar business
Racing car technology reaches road freight vehicles
Another fusion reactor breakthrough
Well-backed MEMS startup closed?
Ultrasonic sensors for single-use medical applications
August 26, 2015
Non-invasive ultrasonic sensors are widely used in medical technology: they measure flow rates with automatic fluid intake, ...
Acal BFi and Stollmann announce distribution agreement
A New York adventure
BMS optimised for high power density, low price
- Software-Defined Radio Handbook
- Why Making the Move from a Variable Transformer to a VariPLUS is the Right Decision
- Automating Leakage and Functional Testing
- Automotive Circuit Protection using Littelfuse Automotive TVS Diodes
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Novelda is giving away two full XeThru Inspiration kits worth 1499 US Dollars each, for EETimes Europe's readers to experiment first hand with its XeThru technology.Based on the use of radio waves, rather than infrared, ultrasound or light, the company's X2M1000 Inspiration modules can detect presence just from the chest movement while breathing, and measure both the rate and... MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.