LED Drivers
Synchronous Step-Down LED Driver Delivers Over 20A of Continuous LED Current
Linear Technology just announced the LT3743, a synchronous step-down DC/DC converter designed to deliver constant current to drive high current LEDs. The device's 5.5V to 36V input voltage range makes it ideal for a wide variety of applications, including industrial, DLP projection and architectural lighting. The LT3743 provides up to 20A of continuous LED current from a nominal 12V input, delivering in excess of 80 Watts. In pulsed LED applications, it can deliver up to 40A of LED current or 160 Watts from a 12V input. Efficiencies as high as 95% eliminate any need for external heat sinking and significantly simplify the thermal design. A frequency adjust pin enables the user to program the frequency between 100kHz and 1MHz so designers can optimize efficiency while minimizing external component size. Combined with a 4mm x 5mm QFN or thermally enhanced TSSOP-28 package, the LT3743 offers a very compact high-power LED driver solution.
TI’s Dual-output 200-ma Power Supply Improves Picture Quality In AMOLED Displays
Texas Instruments introduced a new 200-mA dual output power supply designed to provide improved picture quality for active matrix OLED (AMOLED) displays that require positive and negative supply rails. The TPS65137 uses a low dropout (LDO) post regulator for line and load transient response with minimum output voltage ripples to provide stable picture quality.
AnalogicTech Introduces Powerful, High-Efficiency Multi-String Backlight
Advanced Analogic Technologies, Inc. today introduced its AAT1409/7/5 family of multi-string LED backlight drivers. Offering integrated boost converters and precision current sinks that can support up to 88 LEDs at 360mA total LED current, the AAT1409/7/5 drivers are among the most powerful in the marketplace. These new drivers bring to market a fully featured solution that reduces the number of backlight PCBs, reducing costs, yet is capable of driving high brightness LEDs and ensuring uniformity across the display by precisely controlling the backlight intensity.
Fairchild Semiconductor Delivers High Conversion Efficiency for Smartphone Backlighting Applications
As the mobile handset market continues to grow and smartphone usage and market growth become significantly more prevalent, designers are challenged to add functionality while reducing the form factor and components in the overall design. Responding to customer needs and these trends, Fairchild Semiconductor developed the FDZ3N513ZT – an N-Channel and Schottky diode combination in a small 1mm x 1mm footprint.
Fairchild Semiconductor’s Linear LED Drivers Conserve Space in Portable Backlighting Applications
Space-constrained applications, such as handsets, glucometers and other portable devices that require illumination of LCD displays and keypads, now have a linear LED driver option that can save up to 60 percent board space compared to alternate solutions. The design of Fairchild Semiconductor's (NYSE: FCS) FAN5622/24/26 reduces overall component count by eliminating additional passive components used in charge pumps and series boost LED drivers. Fairchild's linear LED drivers simplify design with an easy-to-use control interface and a minimal amount of components.
Semtech Takes LED Driver Platform Offering to New Level with Its First 10-Channel Device in Ultra-Small, Low-Profile 4x4x0.6mm Package
Semtech today announced the SC442, its first 10-channel white LED driver with an integrated 3A boost power switch. The device is capable of driving up to 120 LEDs at up to 30mA per channel and is packaged in an ultra-small, low-profile 4x4x0.6mm, 28-pin MLPQ package. The high-density package, small external filter components, wide operating voltage range and high efficiency satisfy space constrained LED backlights serving LCD monitors and LCD-TVs. The high density LED driver is also ideal for ultra-bright displays exceeding 500Nits which serve medical, industrial, avionics and navigation markets, as well as digital signage applications.
Rugged high-voltage LED driver family wins UL safety approval
Sunpower's Power LED PLEC-120SxxxDT driver family has been approved to the UL 8750 safety standard. This international standard underwrites the family's LED lighting role, as it is specifically written for solid state lighting in a wide range of applications, many in demanding environments. The units have a -35˚C to +65˚C operating temperature range with no output derating.
45V, 750mA LED Driver for Boost, Buck or Buck-Boost High Current LED Applications
Linear Technology announced the LT3519, a 45V, high side current sense DC/DC converter designed to drive high current LEDs. The LT3519's 3V to 40V input voltage range makes it ideal for applications such as automotive and industrial lighting. The combination of an internal 45V, 750mA switch, Schottky diode and internal compensation provides a highly compact LED driver solution.
MAX16833: High-voltage HB LED driver enables more reliable, fault-tolerant automotive LED driver applications with lower EMI noise
Maxim Integrated Products announces the MAX16833, a high-voltage HB LED driver for boost, buck-boost, and buck configurations. The device's unique architecture offers comprehensive short-circuit protection, single-wire connection to LEDs, and internal frequency dithering. These features make it easier for designers to meet the demanding reliability requirements of high-power automotive lighting applications such as DRLs (daytime running lights), position lights, turn signals, and high-/low-beam assemblies.
Toshiba Electronics announces 9-channel constant current LED driver with I2C bus interface
Toshiba Electronics Europe has expanded its range of high-accuracy LED drivers with a nine-channel device that features an I2C bus interface and a constant current output drive capability of up to 50mA per channel.
ON Semiconductor’s New Integrated LED Driver Improves System Efficiency for Low Bay, Street and Architectural Lighting Applications
ON Semiconductor today announced the further expansion of its solutions for LED lighting with the introduction of an offline LED driver that integrates power factor correction (PFC) and isolated step-down AC-DC power conversion in a single stage. By eliminating the need for a dedicated PFC boost stage, the NCL30001 offers a reduced component count, lower cost solution that supports higher overall system efficiency in LED power supplies for applications such as LED-based street, low bay, wall packs, and architectural lighting.
Drive up to 16 Channels of Ten 50mA LEDs with 3,000:1 True Color PWM Dimming
Linear Technology has announced the LT3754, a 16-channel LED driver, utilizing a step-up DC/DC controller capable of driving up to 45V of 50mA LEDs per channel. Its internal 60V, 1MHz DC/DC boost mode controller is designed to operate as a constant current LED driver for up to 160 white LEDs. From a 12V input, the LT3754 can drive 16 channels, each with up to ten 50mA white LEDs in series while delivering efficiencies exceeding 92%. Its multi-channel capability makes it ideal for medium and large-sized TFT-LCD backlighting applications. Its input voltage range of 6V to 40V makes it ideal for automotive, avionic, HDTV and industrial display applications.
MAX17127: Highly integrated six-string WLED driver for notebooks and netbooks
Maxim introduced the MAX17127, a six-string WLED driver that provides a complete backlighting solution for notebooks and netbooks. The high-performance step-up controller integrates a 48V MOSFET capable of driving up to 13 LEDs/string. This integration reduces BOM cost and saves board space by eliminating an external MOSFET. The step-up controller frequency can be programmed from 250kHz to 1MHz, allowing flexibility in selecting external components. The MAX17127 features a wide input-voltage range (5V to 26V), making it well suited for both netbooks that use a 2- to 3-cell Li+ battery and notebooks that use a larger battery.
ZMDI enters the LED market with energy efficient LED driver ICs
ZMDI AG, a global supplier of analog and mixed-signal solutions for automotive, industrial, and medical applications, today announced its entry into the LED market with the first three energy-efficient LED driver ICs of a new family. The drivers achieve up to 95% efficiency and demonstrate ZMDI's commitment to green technology.
MAX8847/48: Backlight drivers with adaptive mode switching boost efficiency by 12% in portable devices
Maxim Integrated Products introduces the MAX8847/MAX8848, negative charge pumps for up to 6 or 7 white LEDs (WLEDs) in a 3mm x 3mm TQFN package. These backlight drivers employ a negative-charge-pump architecture to eliminate in-line resistance from the battery to WLEDs. As a result, mode switching from 1x to 1.5x is delayed during battery discharge, thereby minimizing dropout. The proprietary adaptive-mode-switching technology controls each LED individually. The net result of this innovative technology is a 12% increase in LED efficiency and, thus, longer battery life. This extra efficiency makes the MAX8847/MAX8848 well suited for cell phones, smartphones, digital still cameras, and other portable applications.
Serial LED Driver with Filtered PWM and 32 Step S²C Dimming Control
The AAT1401, AAT1402, AAT1403 and AAT1410 are step-up single channel LED driver with an input voltage range of 2.7V to 5.5V. Parts of the AAT14xx family can drive up to 10 LEDs in a single string. The wide input voltage range, small solution size, advanced dimming features and high efficiency is suitable for LED backlight solutions for single cell Li-ion based equipment. A precision, high voltage current sink maintains the maximum LED current that can be set from 10 to 31mA by a single external resistor. The high switching frequency supports ultra small, low-cost filter components. Two dimming controls are available; 32 dimming steps using the S2Cwire™ interface, and filtered or direct PWM control (dependent on part number). The frequency range of the PWM dimming extends up to 100 kHz and eliminates audible noise and is suitable for CABC (Content Adaptive Brightness Control) applications.
Fairchild Semiconductor’s LED Drivers Enable Design Flexibility and Extend Battery
Fairchild Semiconductor brings designers of mobile handsets, gaming devices, MP3 players and other small display applications LED drivers that deliver 92 percent peak efficiency, extending battery life.
LED driver from Diodes Incorporated increases reliability of high brightness lamp systems
Diodes Incorporated has introduced a multi-topology LED driver IC designed to increase the reliability of high brightness lamps in automotive, industrial and commercial lighting systems. The ZXLD1370 LED driver controller operates in buck, boost and buck-boost modes. It combines patent pending control loops and high-side current sensing to ensure accurate current control of LED strings.
LED backlight driver IC for large displays
The new A8512 from Allegro MicroSystems Europe is a multi-output white LED RGB driver IC for the LED backlighting of large-area LCD monitors and television screens. The new device integrates a scalable-output boost controller operating in constant-frequency current mode control - adjustable between 300 kHz and 1 MHz - driving an external MOSFET. It integrates six internal current sinks each capable of sinking up to 80 mA, which can be combined together to achieve even higher currents. PWM dimming allows LED currents to be precisely controlled over a 500:1 ratio as a percentage of the maximum setpoint determined by the user.
New Compact, Economical, Flat-Flex-Cable Compatible Driver Boards for Powering LED-Backlit LCDs
LCD backlit power specialist Endicott Research Group (ERG) is offering two new LED driver boards that provide compact, economical solutions to OEM panel designers and include FFC/FPC compatibility.
Highly efficient LED driver meets IP67 standard suiting outdoor and tunnel lighting applications
XP Power today announced the DLA series of AC input LED drivers with output power ranges of 50, 75, 100, 120 and 150 W. These highly efficient units, rated at greater than 85% for the 50 Watt and up to 94% for the 150 W models, have a high power factor input ranging from 0.85 to 0.99 depending on the model. The drivers are available with either constant current or constant voltage outputs, with the constant voltage models offering the popular nominal outputs of +12, +18, +24, + 36, +42, +48, +54 or +105 VDC, and constant current models from 350 - 5950 mA. The output voltage of the constant current models is determined by the load.
LED lighting drivers from Diodes Incorporated simplify low power single cell applications
The ZXLD381 and ZXLD383 LED drivers from Diodes Incorporated have been designed to provide the simplest possible solution for driving low power high brightness LEDs from a single solar or rechargeable battery cell. PFM DC-DC converters with an on-board low saturation voltage switching transistor, the devices only need an inductor for high efficiency LED illumination.
NXP Powers Efficient Lighting Introducing Dimmable SSL2103 LED Controller IC
NXP Semiconductors announced the introduction of a new LED controller, the SSL2103. Extending NXP's successful product family of AC/DC LED drivers (SSL2101/SSL2102) for a wide range of lighting applications such as retrofit lamps, the SSL2103 includes the functionality and performance of its sister product, the SSL2101, while extending the application reach towards higher power solutions. The SSL2103 is a versatile device for all AC/DC LED lighting segments with extended power range and extended dimmer compatibility, making it suitable for both dimmable and non-dimmable LED lamps. Furthermore, each product of the SSL210x family seamlessly integrates the same controller functions for easy proliferation into a wide range of LED lamp applications.
High-Power LED Driver from ERG powers HBLED Backlights
LCD backlight power specialist Endicott Research Group (ERG) has introduced a new LED driver that can simultaneously and efficiently power up to 8 strings of high brightness LEDs (HBLEDs). The new Smart Force SFD2C Series is a full-function LED driver board that features a dual output that provides a total maximum current of 1200 mA -- 600 mA per side -- for high efficiency power to LED backlights used in LCDs up to 24" diagonal.
National Semiconductor Introduces Industry’s First LED Driver with Dynamic Headroom Control for High-Power Applications
National Semiconductor announced the industry's first LED driver with dynamic headroom control and multiple outputs for high-power applications that accurately and efficiently drives up to four strings of LEDs. The LM3464, a member of National's PowerWise® energy-efficient product family, maximizes system efficiency and reduces system complexity and cost in LED-intensive applications such as industrial, street and automotive lighting.
230V LED-Driver, no electrolytic caps, dimmable
Code Mercenaries introduces LED-Warrior03, a primary switching LED regulator at the Light+Building 2010 show in Frankfurt. LED-Warrior03 is compatible with standard dimmers and contains no electrolytic capacitors. Compared to standard LED regulators with electrolytic capacitors LED-Warrior03 has the advantage of a much higher life expectancy, matching or even exceeding that of a LED. Compatibilty with standard dimming equipment allows retrofitting existing installations.
TI introduces new LED-lamp Reference Board
Texas Instruments Incorporated today introduced a complete LED lighting driver reference board in collaboration with Lemnis Lighting to help address three important issues: cost, dimming and efficacy. The TPS92010 LED-lamp Reference Board applies TI's semiconductor technology for general LED lighting and Lemnis Lighting's expertise in dimmable lighting applications. The board can help speed adoption of energy-saving retrofit LED light bulbs. The reference board will be available in mid-second quarter and is accompanied by a user's guide that contains the schematics, bill of materials and test results needed to design a dimmable LED lamp.
MAX6948B: WLED driver with PWM-controllable boost maximizes power efficiency
Maxim Integrated Products introduces the MAX6948B, a high-efficiency WLED driver with an integrated boost converter and five GPIO ports that can be used to drive LEDs (powered from an alternate power supply) in parallel. Capable of driving up to six LEDs in series, the boost converter allows PWM control of the boost voltage to maximize power efficiency. The I2C-programmable, 10-bit PWM signal enables 1024 levels of WLED intensity, thus providing precise control over display brightness. These power-saving features make the MAX6948B an ideal backlighting solution for portable applications in which battery life is critical.
Toshiba Electronics announces new 16-channel constant current LED driver with 65536-step grey scale function
Toshiba Electronics has expanded its family of LED drivers with a new device that can maintain constant currents of between 1.5mA and 90mA. Combining high-accuracy brightness control with a built-in PWM grey scale capability, the 16-channel TC62D722 is ideal for traffic signs, information boards and other applications built around multiple colour LEDs.
PowerPax launches range of Mains Dimmable LED drivers
The PowerPax PAXDIM range of mains dimmable LED drivers are optimized for use with all good quality high powered LED products such as LUXEON, Cree, Seoul, Nichia and Osram. These units offer the latest phase control (trailing and leading edge) mains dimmable LED drivers in various wattage outputs between 11W and 40W. The LED driver operates a single channel supplying a user selectable forward current between 175ma and 1200ma. The most common models offer the user the option to select either 350ma, 500ma or 700ma constant current output.
New Power Factor Corrected LED Driver from ON Semiconductor Supports TRIAC Dimming for Residential and Commercial Lighting Applications
ON Semiconductor a premier supplier of high performance, energy efficient silicon solutions for green electronics, has announced the launch of a new power factor corrected dimmable LED driver for residential and commercial lighting applications.
PowerPax - New range of LED Drivers launched
PowerPax announced the launch of a massive range of LED drivers both as constant current and constant voltage versions. Incorporating models from 1W to 300W of power, the range includes plug-in LED drivers, DC input LED drivers, PCB mount LED drivers, leaded and screw terminal type LED drivers all offering both dimming and non dimming outputs.
