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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 colour changes with small variations in driving current. LEDs often support varying system voltages and forward voltages, which can cause variations in LED brightness and colour.
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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2003-12-16 Zetex LED drivers add true analog dimming
Zetex has launched what it claims is the first white LED driver with the option of an integrated true analog dimming mode, offering a noise-free alternative to pulsed dimming control.
2003-04-28 Xilinx FPGAs power Interativa LED display system
Xilinx Inc. has announced that LED displays manufacturer Interativa Paineis Eletronicos has selected the Xilinx Spartan Series and Virtex-II Platform FPGAs for their recently launched color LED display system
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
2008-03-12 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.
2005-06-30 White-LED driver touts innovative brightness control
Micrel points to its MIC2297, a PWM boost regulator that's optimized for driving 10 white LEDs in series, for its innovative brightness control circuitry, which in addition to conserving power also helps to cut noise and EMI.
2010-07-22 White LED flash driver improves camera phone picture quality
ADI introduces the ADP1650, a 500-mA LED flash driver sharpens picture quality in camera-enabled cell phones.
2007-04-24 White LED drivers suit dual-display phones
Suited for dual-display architectures including clamshell phones, the SP6415 white LED driver from Sipex can be configured to automatically turn off the sub-display when the phone is open.
2007-06-20 White LED drivers offer 90% efficiency
Vishay Intertechnology Inc. releases two new 1.25MHz current-mode boost converters optimized for white LED applications
2006-03-31 White LED drivers feature dual-gain architecture
National Semiconductor introduced three new inductorless white LED drivers for display backlighting in cellphones, PDAs, portable gaming devices and MP3 media players
2006-08-16 White LED drivers enable independent brightness control
National's new highly integrated, charge-pump-based, constant-current white LED drivers are suited for single- or multidisplay backlighting in portable consumer products and handsets
2009-09-22 White LED driver targets LCD backlights
TAEC's new 60V power MOSFET driver is designed for white LEDs to be used in LCD panel backlight applications
2005-12-30 White LED driver tailored for portable CE apps
ON Semiconductor unveiled a white LED driver designed to drive high brightness LEDs in torch or flash applications for camera phones and other portable consumer electronic devices.
2008-10-27 White LED driver suits up for automotive displays
Rohm Electronics white LED driver IC (BD8113EFV-E2) provides constant current for white LED backlights in medium- to large-format TFT-LCD automotive displays.
2008-06-23 White LED driver shines in notebook LCD displays
TI introduces a six-channel, 40V white LED driver with a built-in, high-efficiency boost regulator and 1.5-A FET.
2004-12-06 White LED driver provides 92 percent efficiency
Linear Tech released a fractional charge pump, high current white LED driver that delivers up to 1A of LED current.
2009-08-27 White LED driver promises up to 55% power saving
National Semiconductor claims the smallest white LED driver with dynamic display backlight control that drives up to 11 high-current LEDs in series, illuminating larger displays in portable apps.
2006-03-08 White LED driver integrates Schottky diode
Linear Technology announced the LT3491, a constant current white LED driver, which features an integrated Schottky diode on-chip.
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.
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.
2007-11-16 White LED driver features auto brightness adjustment
ROHM has begun sampling the BD6095GUL, touted to be first white backlight LED driver capable of automatic brightness adjustment of LCD backlights based on ambient brightness.
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.
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.
2004-12-21 White LED driver boosts low-profile apps
Allegro's new dc-dc boost converters offer a low-profile solution for driving up to four white LEDs in series from a 2.5V supply, or five white LEDs from a 3V supply.
2007-10-29 WEBENCH ships LED/driver prototypes in 24hrs
National Semiconductor's WEBENCH online design environment now extends to LEDs and touts a 'Build It!' feature that arranges for shipment of a custom prototype LED-and-driver kit within 24hrs.
2008-04-17 Utilizing a white LED driver to cost-effectively drive power-limited xenon flashes in digital cameras, camera Phones
This paper 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.
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