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
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Internet of Things (IoT) manufacturer Ciseco has launched the Raspberry Pi ‘Wireless Inventors Kit’ (RasWIK), featuring 88 pieces to provide everything a Pi owner needs to follow a series of step-by-step projects or to create their own wireless devices, without the need for configuration or even writing code.
RasWIK has been designed to be highly accessible, demystifying the dark art of wireless and enabling anyone with basic computing skills to begin building wireless devices with a Raspberry Pi. You can create anything from a simple traffic light, to a battery monitor, or even a temperature gauge that sends data to the Xively IoT cloud so billions can access the data.This month, Ciseco is giving away twelve Raspberry Pi Wireless Inventors kits, worth £49.99 each for EETimes Europe's readers to win.
And the winners are...
In our previous reader offer, Farsens was giving away five kits for EEtimes Europe readers to evaluate its FenixVortex, Kineo and X1 wireless, battery free sensor tags.
Lucky winners include Mr A. Neil from the UK, Mr. E. Delvaux from Belgium, Mr Lengal from the Czech Republic, Mr H. Bijlsma from the Netherlands, and Mr G. Pfaff from Germany. All should be receiving their packages soon. Lets wish them some interesting findings with their projects.
December 15, 2011 | Texas instruments | 222901974
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