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LED 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.
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2010-04-22 ISL97635 SMBus LED driver programming instruction
Here's an application note that details the instructions in ISL97635 SMBus LED driver programming. It also presents a ISL97635EVALZ evaluation board schematic diagram.
2014-04-11 IR LED from Osram offers remote control capability
The T-shaped SFH 4140 Midled protrudes 0.6mm above and below the board thereby offering remote control functions in a small space.
2013-02-04 Intersil unveiled single-ended LED driver controllers
Geared for industrial and commercial lighting systems, the ISL1903 and ISL1904 support single-stage conversion of the AC mains to a constant current source with power factor correction.
2007-10-01 Integrated LED driver features dimming control
A highly integrated LED driver with analog and PWM dimming control has been introduced by Maxim Integrated Products.
2008-07-01 Integrate SMPS control in LED applications
Solid state lighting with LEDs can offer a combination of flexibility and efficiency unmatched by conventional lighting. It is quickly becoming one of the most exciting fields in electromechanical engineering and design. LED driver applications require buck converters because LEDs are current mode devices.
2013-09-04 Innovative LED drivers deliver energy savings
Researchers from Hong Kong created a driver that powers LED light bulbs with an approach called multi-level PWM, which delivers remarkable improvements in terms of light quality and energy efficiency.
2008-06-05 Inductorless, dual output LED flash drivers introduced
Leadis Technology Inc. has started sampling the LDS8620 and the LDS8621, a new family of inductorless 200mA, dual-output LED flash/lamp drivers, in low-profile (0.8mm), space-saving 3mm x 3mm TQFN packages
2006-02-07 Inductor-based DC/DCs extend LED driver portfolio
Semtech's SC4501, SC4502 and SC4502H step-up switching regulators can power up to ten white LEDs, OLED displays or generate the bias voltages for TFT LCDs.
2013-04-04 Improving digital signage with LED drivers
As digital signage projects become ever more sophisticated, equipment designers must rely on LED driver ICs capable of satisfying the unique demands of this application space.
2009-11-03 Implementation of integrated MPPT solar charger and LED driver using PowerPSoC
Cypress' MPPT Solar Charger and LED driver is a PowerPSoC-based solution. It is used to charge solar-based lead acid batteries by employing a Maximum Power Point Tracking (MPPT) algorithm.
2007-05-08 Implement extra functions with the NCP5608 LED driver
Although the embedded I2C makes programming the chip very easy, it turns out that the flash can be trigged by the camera with no access to the I2C protocol.
2008-07-16 Hysteretic converters for multiple LED lighting
Hysteretic converters are used to drive LEDs in lamp replacement and emerging lighting applications. The ease of use and inherent stability of the topology make it a first choice for efficient inductive switching regulator solutions. The simple topology can be used in different configurations or other unintended external applications.
2014-01-03 How to simplify LED driver development
Know how to develop an LED driver system based on highly integrated LED driver modules and how several drivers can be interconnected for PWM dimming.
2007-05-22 How to implement high current LED arrays
This article summarizes the key requirements for driving Osram Ostar high current LED arrays and shows how these requirements can be met with an easy-to-implement driver based on Micrel's MIC2196 chip.
2014-01-02 How to drive LED with fluorescent ballast (Part 1
Here's a look at an AC/DC converter without active LED current control
2010-07-07 How to apply additional PWM intensity control to LED drivers
This application note discusses how additional PWM intensity control can be applied to constant-current LED drivers by using a switched-LED power supply
2007-10-25 High-voltage driver lights up 72 white LEDs
A LED driver capable of driving up to 72 white LEDs has been developed by Power Analog Microelectronics.
2015-07-01 High-efficiency LED drivers target any-colour chips
The AS1111x devices from Ams can drive up to four high-current LEDs and feature up to four channels of 40mA drive (for high brightness LEDs); 150mV headroom to operate.
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
2007-10-30 High-brightness LED driver powers 15W systems
National Semiconductor's two new high-brightness LED drivers in its PowerWise product family are suited to industrial and automotive tasks and general lighting/signage
2008-04-18 High intensity LED drivers using NCP3065/NCV3065
This application note describes a DC/DC converter circuits that can easily be configured to drive LEDs at several different output currents and can be configured for either AC or DC input.
2000-05-09 HC05 MCU LED drive techniques using the MC68HC705J1A
This application note demonstrates how the high-current sink pins of an MC68HC705J1A can drive a LED directly without requiring an external amplifying transistor
2010-05-17 HBLED driver integrates PWM dithering
Micrel Inc. is rolling out the MIC3203 step-down high-brightness LED (HBLED) driver controller IC with high-side current sense and PWM dithering feature for EMI control.
2007-02-15 HB-LED drivers suit automotive lighting apps
Maxim has introduced a high-voltage, 3-channel, linear high-brightness LED driver with open-LED detection for automotive exterior and interior lighting applications.
2008-03-26 HB LED drivers handle long LED strings
Maxim Integrated Products has introduced high-voltage, linear HB LED drivers capable of driving a long string of HB LEDs from a 6.5V to 40V input supply
2008-08-25 HB LED drivers deliver green lighting
Maxim Integrated Products has developed the MAX16822A/B and MAX16832A/C family of 2MHz, high-brightness (HB) LED drivers with an integrated MOSFET and high-side current-sense circuitry
2007-02-13 HB LED drivers deliver 94 percent efficiency
Maxim has introduced high-efficiency LED drivers, each capable of delivering from 1W to over 25W of output power with up to 94 percent efficiency, while driving as many as six white LEDs connected in series
2010-05-21 HB LED driver tailored for outdoor LCDs
Semtech Corp. has released the SC446 three-channel high-brightness LED (HB LED) driver with an integrated 2.5A boost power switch.
2008-12-22 HB LED driver simplifies green lighting designs
Maxim Integrated Products has developed the MAX16834, a current-mode, high-brightness (HB) LED driver for boost, buck-boost, SEPIC and high-side buck topologies.
2007-08-28 HB LED driver powers common-anode LEDs
Maxim Integrated Products claims that it has introduced the MAX16821 synchronous HB LED driver with rapid current pulsing, said to be the first to drive common-anode LEDs.
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