Laurence Marchini, Editor, writes:
We see from your search that you're looking for information on the term "LED current",
and we have a large number of manufacturers' news releases and technical articles here on Electronicstalk which will be of interest.
Let me be your guide.
Start with
the news release LED drivers cover all the latest options from
Zetex, which we summarised at the time by saying "Inductive DC/DC convertors drive single or multiple LEDs with currents from 700mA through to 1.5A, in buck, boost and buck/boost configurations".
A couple of weeks before,
we featured the news release White LED driver cuts down on flicker from
Advanced Analogic Technologies: "By driving up to 10 white LEDs in a serial string, the AAT1239-1 simplifies the use of larger LCD panels in a wide array of battery-powered portable devices".
In January 2008, we covered the news from Linear Technology Corp
concerning its LT3595
- take a look at Buck mode convertor drives up to 160 LEDs
which says: "An external resistor sets the LED current for all 16 channels and dimming is then controlled for each channel using individual PWM pins".
Take a look also at the news release from Maxim Integrated Products, Programmable LED driver removes need for binning,
as well as Driver handles two displays with power to spare from Linear Technology Corp,
and LED driver runs displays at low voltages from Catalyst Semiconductor.
See also:
LED driver powers three bright diodes
(January 2008)
The TPS61165 can drive backlight LEDs for media form factor displays up to 9in diameter, such as those used in ultramobile PCs and LCD photo frames
LED driver dims three strings
(December 2007)
Devices feature three 36V-rated open-drain constant-current sink outputs capable of delivering up to 150mA to three separate strings of HB LEDs
Drivers boost contrast on the big screen
(December 2007)
High-brightness LED drivers fit the latest trend in LCD backlighting, which is to synchronise the LCD backlight with the TV picture
LED driver powers green lighting
(November 2007)
Boost driver device reduces component count by handling both charging and driving in solar-powered LED lighting applications
Conditioner accounts for position sensor errors
(November 2007)
The iC-MQ ensures that the parameters set initially for the offset, amplitude and phase correction are kept valid
LED drivers provide stable colours
(October 2007)
The LM3401 is a high-efficiency hysteretic PFET switching controller that provides a high-performance, constant current drive to a string of LEDs, resulting in a constant colour output
LED driver suits mobile applications
(October 2007)
Linear Technology's LTC3219 LED driver provides nine individually configurable current sources for main, sub and RGB displays
Chipset suits LED lamps
(October 2007)
Zetex Semiconductors' chipset significantly reduces the size and weight of the PCB in the neck of the lamp and the overall cost of lamp manufacture
LED driver suits large applications
(October 2007)
A high-speed, four-wire serial interface with up to 25MHz clock frequency controls each individual channel using a shift register and latch configuration
Power chip enables brighter flashes
(October 2007)
Step-up current regulator delivers the high current levels needed to support flash lighting for higher resolution CCD imagers
Driver powers up large LED displays
(October 2007)
Constant-current sink LED driver is designed for billboard, marquee, instrument and other larger, general-purpose LED displays
Dimming driver is bright answer for LEDs
(September 2007)
Flexible HB LED driver is ideal for applications that require a wide dimming-control range, such as interior and exterior automotive lighting
LED/CAM driver suits phone displays
(September 2007)
Linear Technology's LTC3207 LED/CAM driver provides 12 individually configurable current sources for main, sub, RGB, auxiliary or general purpose (GPO) displays/lights/outputs
WLED drivers offer small solution size
(September 2007)
Designed to drive two to six WLEDs for backlighting, the MAX8901A/MAX8901B are ideal for the 1.5 to 4-inch LCDs used in battery-operated devices
LED driver offers high brightness
(August 2007)
The MAX16821's rapid-current-pulsing LED technology meets the demanding requirements of projection applications
Buck converter reduces complexity
(August 2007)
Solid State Supplies' new architecture allows an external RSET control resistor to preset a regulated LED current up to 350mA from supplies as high as 24V
Convertors keep backlights constant
(August 2007)
DC/DC convertors drive high current LEDs at constant current for applications such as automotive display backlighting
Charge pumps provide all handset LED power
(August 2007)
The AAT2846 and AAT2856 combine backlight drivers, high-current flash drivers and two general purpose LDOs linear regulators in a single package
Driver is simple answer for handheld backlights
(August 2007)
High efficiency, low noise and extremely small total solution footprint make LT3591 ideal for handheld applications requiring up to 10 white LEDs for backlighting
LED driver is cost engineered for budget handsets
(July 2007)
Driver chip provides basic illumination for low-cost TFT-LCD panels in an extremely small footprint while requiring just two external components
Convertor is cooler choice for LED driving
(July 2007)
Buck convertor offers a simpler and smaller alternative to linear regulators for driving high-brightness LEDs in step-down applications, eliminating the need for heatsinks
Driver sheds light on handset flash and video
(July 2007)
Inductorless high-current white LED driver delivers up to 400mA of LED current
LED driver shrinks space for camera flashes
(June 2007)
Device based on a high-frequency synchronous-boost topology with constant current sink is compact solution for driving single high-brightness white light emitting diodes
White LEDs operated from one battery cell
(May 2007)
The one-cell battery operation of Prema Semiconductor's PR4402 allows smaller and light weighted products at lower cost
Boost driver does more with single cells
(April 2007)
LED boost driver is the latest member of a family of devices for operating white LEDs from a single battery cell
Driver IC for LED backlights
(April 2007)
The SC620 octal I2C-controlled LED driver is designed to provide regulated currents for powering a wide range of LEDs, including white, red, blue, green or yellow, with different forward voltages
Novel LED driver saves portable power
(April 2007)
Low dropout driver is designed for emerging power-conscious portables where the LEDs are driven directly from the battery
LED flash drivers enable multiple applications
(April 2007)
Single-wire dynamically programmable charge pump LED flash driver is capable of driving up to 500mA
LED driver powers LCD backlights
(March 2007)
Low-side LED driver is ideal for powering small and mid-size LCD modules that use LEDs for backlighting
Charge pump cuts the cost of LED driving
(March 2007)
High-efficiency charge pump IC offers a simple low-cost method of driving up to six white LEDs in various application configurations
High-efficiency driver produces uniform white
(March 2007)
White LED backlight driver has built-in string-current-control circuit to deliver +/-1.5% regulation accuracy between strings, which ensures even brightness for all LEDs
Automotive LED lamp driver shows faults
(February 2007)
High-voltage three-channel linear high-brightness LED driver has open-LED detection for automotive exterior and interior lighting applications
MAX16819/MAX16820, high-efficiency LED drivers
(February 2007)
Maxim Integrated Products introduces the MAX16819/MAX16820, high-efficiency LED drivers for architectural, industrial, and automotive lighting applications
Boost convertors drive more LEDs for backlights
(January 2007)
Designers can now employ a single boost convertor with a digital interface to run five 20mA strings of up to four series-connected white LEDs