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What is an LED driver?
Regardless of type, size, or power, all LEDs work best when driven with a constant current source since LED color changes with small variations in driving current. LEDs often support varying system voltages and forward voltages, which can cause variations in LED brightness and color.
An LED driver is a self-contained power supply that has outputs matched to the electrical characteristics of your LED or array of LEDs. There are currently no industry standards (as of 2009), so understanding the electrical characteristics of your LED or array is critical in selecting or designing a driver circuit. Drivers should be current-regulated (deliver a consistent current over a range of load voltages). Drivers may also offer dimming by means of pulse width modulation (PWM) circuits. Drivers may have more than one channel for separate control of different LEDs or arrays.
total search3746 articles
2013-11-19 Zhaga Consortium releases LED light engine specification
Luminaires built using interchangeable, Zhaga-based LED light sources enable manufacturers to switch from one supplier to another without changing the design of the luminaire.
2006-06-02 Zetex unveils new mini LED driver
Zetex Semiconductors has introduced mini LED driver requires a single external resistor to set its output current, simplifying LED driving.
2008-05-09 Wireless RC revs up LED design kit
Texas Instruments has launched its new wireless remote control LED design kit for a wide range of applications.
2016-02-05 White LED power module promises to streamline design process
Vishay Intertechnology developed the VLSL12A03-3Q3T-50A, a metal-core-based cool white LED power module featuring 12 high-brightness LEDs with high luminous flux of 4000lm each at 1A.
2005-12-20 White LED offers 12cd at 350mA
The latest high brightness warm white LED from Dominant Semiconductors provides an incandescent-grade illumination.
2012-02-24 White LED lenses reduce system cost
LEDiL rolls 33 lenses qualified for use with Cree's XLamp XT-E white LEDs that claim a reduction in the number of LEDs required in a lighting system, leading to smaller power supplies and heat.
2008-09-16 White LED flash drivers brighten DSCs
Choosing the right LED flash driver can seem like a daunting task if certain types of questions are not addressed early in the design cycle. By examining some issues and concerns early, many future headaches can be prevented.
2007-04-24 White LED drivers powers two drivers simultaneously
Suitable for dual display phones, the SP6415 white LED driver can be configured to automatically turn off the sub-display when the phone is open.
2006-04-03 White LED drivers feature dual-gain architecture
National Semiconductor Corp. has introduced three inductorless white LED drivers for display backlighting in cell phones, PDAs, portable gaming devices and MP3 media players.
2007-06-21 White LED drivers feature 1µA shutdown current
Vishay Intertechnology's two new 1.25MHz current-mode boost converters feature 90 per cent efficiency, less than 1µA shutdown current and a small footprint.
2006-01-02 White LED driver outputs current pulse up to 350mA
ON Semiconductor's driver for high-brightness LEDs offers automatic operating modes of 1X, 1.5X and 2X to deliver up to 90 per cent efficiency.
2006-03-08 White LED driver offers low-cost solution
Allegro MicroSystems has unveiled a high efficiency charge pump white LED driver that promises a simple, low-cost white LED driver solution for portable electronics display apps.
2006-03-09 White LED driver integrates Schottky diode
Linear Technology has announced the LT3491, a constant current white LED driver, which features an integrated Schottky diode on-chip.
2005-08-10 White LED driver includes programmable oscillator frequency
National Semiconductor has launched an inductive-boost series white LED driver that features programmable oscillator frequency.
2005-08-24 White LED driver delivers 500mA
Linear Technology rolled out a fractional charge pump, white LED driver that delivers up to 500mA of LED current.
2009-09-22 White LED driver circuits for offline applications using standard PWM controllers
This application note discusses techniques for powering LEDs directly from the AC mains, not only to develop the requisite voltage and current, but also to deliver power from the AC mains with near unity power factor while using off-the-shelf constant frequency PWM controllers.
2007-03-29 White LED delivers 50,000hrs operation
The new Power DomiLED white LED from Dominant Semiconductors promises a lifetime of up to 50,000hrs.
2011-11-16 White LED controller offers 5 current sources
ST announces STLED25, white LED backlight controller IC that claims to simplify circuitry for consistent high-quality backlighting.
2012-02-13 White LED boasts twice the lumens-per-dollar
Cree's XLamp XT-E white LED provides up to 148lm/W at 85°C (or up to 162lm/W at 25°C) at 350mA.
2009-09-09 What's slowing down LED lighting adoption?
This article looks at what's slowing down the adoption of solid state lighting in the form of high intensity LEDs, a highly efficient light source.
2011-10-17 Waterproof LED drivers tout 90% efficiency
XP Power releases the DLG series of constant voltage and constant current LED drivers that are waterproof to a depth of one metre and tout up to 90 per cent power efficiency.
2008-01-31 Want to boost battery voltage in White LED apps?
If you're tired of the extra cost and real estate lost when using a step-up DC/DC converter, consider instead a charge pump, also known as a switched capacitor converter, to boost battery voltage. Here are the principles involved.
2013-02-13 UV LED chips come in CBT-90 form factor
Luminus Devices' CBT-90-UV LEDs have a monolithic 9mm2 die that emits light directly into air.
2008-04-17 Utilising a White LED Driver to Cost-Effectively Drive Power Limited Xenon Flashes in Digital Cameras and Camera Phones
This article depicts the basics of the xenon concept and gives details on a typical low power/low cost flash application.
2008-07-28 Utilising a white led driver to cost-effectively drive power limited xenon flashes in digital cameras and camera phones
This article depicts the basics of the xenon concept and details a typical low power/low cost flash application.
2005-06-10 Using the TPS61042 white-light LED driver as a boost converter
Although designed to be a white-light LED driver, the TPS61042 can be configured as a discontinuous, hysteretically controlled boost converter with a 500-mA peak switch current.
2004-12-02 Using the ATAR510 microcontroller as an LCD/LED driver
This app note describes the attachment of an LCD and LED to the ATAR510 microcontroller.
2013-06-26 Using SSL21101T flexible focus flyback LED driver
Find out how to design a mains LED driver using the NXP SSL21101T LED Driver IC in flyback mode.
2012-02-02 Using LM3492 LED driver for AR111 app
Read about the LM3492 demonstration board designed for converting nominal 12VAC from electronic transformer output to drive seven series connected LEDs at 360-mA average current.
2012-01-30 Using LM3448 isolated flyback LED driver
Read about a demonstration board that highlights the performance of a LM3448 based flyback LED driver solution.
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