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WLED driver What is an LED driver? Search results

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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 search37 articles
2007-04-03 WLED driver uses true single-wire digital interface
Micrel has launched the MIC3289, a 1.2MHz PWM WLED driver featuring internal Schottky diode and true single-wire digital interface for brightness control and enable function.
2008-04-24 WLED driver packs negative charge pump, two LDOs
Maxim Integrated Products has introduced the MAX8822, said to be the industry's only WLED driver to combine a highly efficient negative charge pump with two independent LDO regulators.
2010-04-14 WLED driver offers flicker-free dimming feature
Micrel Inc. has released the MIC3263 six-channel WLED driver equipped with a highly versatile dimming control scheme for LED brightness in small LCD panels.
2008-03-12 WLED driver integrates audio amp, LDOs
Maxim Integrated Products has introduced the MAX8821, said to be the only WLED driver to combine a highly efficient, negative charge pump with a fully differential, bridged audio amplifier and two low-noise, LDO current regulators.
2007-12-13 WLED driver has two LDOs for portable systems
Advanced Analogic Technologies has released a highly integrated four-channel white LED driver for portable systems operating off a single-cell Li-ion/polymer battery
2007-03-27 WLED driver features integrated Schottky diode
Linear Tech's LT3591 white LED driver features an integrated Schottky diode on chip, eliminating both the added cost and space required by an external diode
2010-03-31 WLED driver ensures precise brightness control
Maxim Integrated Products is rolling out a high-efficiency WLED driver with an integrated boost converter and five GPIO ports.
2008-02-01 WLED driver enables large LCDs in portable apps
By driving up to 10 WLEDs in a serial string, AnalogicTech's new boost converter simplifies the use of larger LCD panels in battery-powered portable devices.
2007-06-19 White LED driver integrates Class AB audio amplifier
Maxim Integrated Products introduces the MAX8678, the industry's only white LED (WLED) driver to combine a highly efficient negative charge pump with a fully differential, bridged audio amplifier.
2007-06-25 TI unrolls high-power WLED driver IC
TI has rolled out a device based on an HF synchronous-boost topology with constant-current sink to drive single white LEDs.
2010-01-07 Supplement the MAX6948 WLED driver with external PWM control
This application note explains how to add external PWM intensity control to supplement a device's internal PWM. The MAX6948 WLED driver serves as the example device. Configuration settings and performance data are shown.
2009-05-15 Phone market welcomes WLED drivers
AnalogicTech has introduced a set of flash and backlight white LED (WLED) drivers for the competitive feature phone market
2008-10-31 Implementing a White LED (WLED) Controller on an IGLOO FPGA
The main objective of this design is to control the intensity/brightness of white LEDs by varying the duty cycle on the PWM control input of the WLED driver chip.
2011-01-18 High-efficiency 6-channel WLED driver for 72 LEDs
LDS8763 white LED driver from IXYS Corp. designed for wide array of display and lighting needs
2010-06-10 DC/DC converters pack WLED driver, VCOM buffer
Advanced Analogic Technologies Inc. is offering its latest active matrix TFT LCD DC/DC converters that include a WLED driver and VCOM buffer.
2008-05-29 AnalogicTech debuts 2A flash driver
Advanced Analogic Technologies Inc. (AnalogicTech) has announced the AAT1282, said to be the industry's first 2A flash LED driver IC capable of delivering high intensity light from white LEDs
2010-08-06 10ch 120 WLED driver IC highlights efficiency
The SC442 is a 10ch, high-efficiency integrated step-up (boost) driver IC capable of powering up to 120 WLEDs. The device accepts a wide input voltage of 4.5V to 21V with no internal regulator or bypass capacitor required
2008-04-21 Xenon flash application design based on NCP5080 integrated with IGBT driver and photo sense function
This paper presents how to design Xenon flash application based on NCP5080 which is a high voltage boost driver integrated with IGBT driver, photo sense function, thermal shutdown, transformer primary side current limit and flash control input
2008-05-19 WLED drivers backlight entry-level phone displays
AnalogicTech's AAT3103 constant frequency, charge-pump-based, current source WLED drivers are designed to backlight lower-cost LCD displays in entry-level cellphones
2006-03-07 White LED driver delivers 120mA output current
Allegro MicroSystems unveiled a new high efficiency charge pump white LED driver that promises a simple, low-cost white LED driver solution for portable electronics display applications
2009-10-14 Flash driver offers two switching frequency options
Maxim Integrated Products is offering the MAX8834, a 1.5A white-LED (WLED) flash driver IC in a tiny, 5mm x 5mm wafer-level package (WLP).
2007-02-05 Boost converters ease large-panel WLED design
AnalogicTech has rolled out two high-efficiency boost converters to address the design challenges in using multiple strings of series-connected WLEDs to provide uniform illumination in large-panel lighting applications.
2008-05-05 AAT2847 Eval: 4-channel backlight driver with dual LDOs
AnalogicTech's AAT2847 includes a four-channel LED backlight driver and two integrated 200mA LDOs as additional power supplies for display and camera related chipsets
2007-06-18 Select the best topology for WLED drive electronics
Designers attempting to collapse the electronics required to drive LEDs into the base of a light bulb face major challenges. This article discusses how to meet these challenges when replacing older lighting technology with LEDs.
2006-05-08 Power saving tech boosts efficiency in white LED apps
CMD's new power saving technology and PhotonIC products were designed to increase efficiency in white LED apps at the lowest BOM and the smallest footprint.
2007-01-08 Charge pump drives up to six white LEDs
Allegro's charge pump IC offers a simple, low-cost WLED driver solution for driving up to six WLEDs in various application configurations.
2008-05-05 AAT2833/34 Eval: 240mA total display solution for portable devices
Based on a tri-mode charge pump power engine, AnalogTech's AAT2833/34 is a total solution IC for portable display applications and is capable of delivering 240mA of output current for white LED backlight and RGB applications.
2008-04-16 Step-up converters drive six rows of up to 10 WLEDs
STMicroelectronics has introduced three monolithic step-up converters for LED backlights and lighting, providing 30mA or 85mA current sources for six rows of up to 10 white LEDs.
2010-07-02 LED drivers cut need for external Schottky diode
IXYS Corp. has released the LDS8710/11, LDS8720/24/26 inductor-based, high-efficiency LED driver family that eliminates the external Schottky diode normally used in the rectification loop
2008-06-13 Drivers trim footprint of mid-range camera phones
Advanced Analogic Technologies has unveiled the AAT2848, a trimode charge pump driver IC for white LED backlight display and flash applications
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