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. |
total search1875 articles
| 2010-07-27 | Netbook sales to almost double by 2013 ABI Research projects that some 60 million netbooks are expected to ship this year, a figure that will almost double by 2013, worldwide. The market has seen rapid growth, led by ASUS and Acer, since the category was first introduced in 2008, and the trend will start to decline in 2014-2015 according to ABI |
| 2005-11-30 | National's new DC/DC converters with true shutdown isolation National Semiconductor introduced two new step-up DC/DC converters that provide a complete solution for driving dual-display or large, single white LED string backlighting apps. |
| 2013-05-07 | Molex updates latest batch of Brad mPm Connectors Brad mPmDIN valve connectors conform to industry standard EN 175301-803 and feature standard circuitry options, including LED indicators, blocking diodes and voltage-dependent resistors. |
| 2012-11-08 | MIPS will live on, says Imagination MIPS Technologies has agreed to a buyout agreement involving $350 million from an ARM-led consortium and $60 million from Imagination Technologies. |
| 2009-04-14 | Micron, Nanya seek Taiwan gov't support Micron Technology Inc. and Nanya Technology Corp. have rejected a plan to join a state-led memory venture in Taiwan. However, in a new twist, Micron and Nanya are asking for aid from the Taiwan government. |
| 2012-10-05 | Microchip's DSCs optimised for power, lighting apps The dsPIC33 Digital Signal Controllers features lower power consumption, enabling higher efficiency in AC-DC and DC-DC power supplies, HID and LED lighting and other power-conversion applications. |
| 2007-07-24 | Medium size backlight NCP5050: Drive up to 120 LEDs This application note illustrates how the NCP5050 white LED driver can be configured to drive multiple LED strings for LCD backlighting and how to expand the output voltage rating beyond its 20V rating. |
| 2006-03-15 | Maxim's panel meter ADCs with 4-20mA current output Maxim's new stand-alone panel meters feature sigma-delta ADCs which digitize fully differential analog signals in the ±2V and ±200mV range and display the results with 3.5- or 4.5-digit resolution on a local LED display. |
| 2004-09-08 | Maxim power supply with one inductor, no charge-pump diode Maxim released its MAX1578 and MAX1579 devices, which it claims as the first complete LCD bias and white-LED power supplies with only one inductor and no charge-pump diode. |
| 2007-02-13 | Market buzz: FITI to buy shares in HPO, AOT Foxsemicon Integrated Technology (FITI), an affiliate of Hon Hai Precision Industry Co. Ltd, will buy 300 million shares from LED chip manufacturer High Power Opto Inc. to expand business in the LED market. |
| 2005-05-27 | Magnum Semiconductor set up to buy Cirrus video line Cirrus Logic Inc. has agreed to sell its digital video product line to Magnum Semiconductor Inc., a privately held company formed by an investment group led by Investcorp and August Capital, Cirrus said. |
| 2002-05-01 | Magnecraft general purpose 10A relays offer new features Magnecraft & Struthers-Dunn's 78 series of general purpose 10A relays comes with an optional push-to-test button and a green LED status lamp. |
| 2013-03-28 | Magnachip qualifies Sidense's memory macros for HV process Sidense's SLP 1T-OTP macros have been fully qualified for MagnaChip's 180nm 1.8/3.3/18V high-voltage CMOS and mixed-signal process for LED lighting, power management and display controllers. |
| 2002-02-08 | Lumitex fiber-optic panels to replace CCFLs With current consumption placed at 10mA to 20mA (2Vdc) and a lifespan of 100,000h, the company's LED-driven fiber-optic panels are positioned to replace CCFLs to backlight LCDs. |
| 2009-02-04 | Low current input circuit ideas Advancements in optocoupling and LED technology have given us the 6N139. Here are some few circuit ideas to stimulate the designer's interest. |
| 2010-03-10 | LM3429 boost evaluation board This evaluation board showcases the LM3429 NFET controller used with a boost current regulator. It is designed to drive nine to 12 LEDs at a maximum average LED current of 1A from a DC input voltage of 10V to 26V. |
| 2006-03-14 | Lite-On, Yulon Nissan sign R&D agreement Optoelectronics manufacturer Lite-On Technology Corp. and automotive parts maker Yulon Nissan Motor have announced a joint agreement to develop LED-based automotive headlights. |
| 2005-10-24 | Linear Tech's new DC/DC converter tailored for driving LEDs Linear Technology rolled out a 36V, 2MHz step-down DC/DC converter designed to operate as a constant current LED driver. |
| 2004-08-11 | Linear Tech voltage converter drives multiple displays Linear Tech's new step-up/step-down fractional charge pump voltage converter can drive a 1-6 LED main display and 1-4 LED sub-display plus an RGB display. |
| 2004-12-16 | Linear Tech switching regulator tailored for TFT displays Linear Tech's new quad switching regulator is designed to provide all necessary power supply functions for TFT displays and their required white LED backlighting. |
| 2003-09-15 | Linear multi-display driver features digital control Linear Technology has released the LTC3205, an 800kHz, low noise, high efficiency step-up/step-down fractional charge pump converter that can drive a 1-4 LED main display. |
| 2010-01-11 | LCD controller simplifies car infotainment design The devices feature an embedded MCU, LED/CCFL backlight controllers, and a four-wire resistive touch screen controller. |
| 2004-02-02 | Labsphere module combines radiometer, spectrograph Labsphere has developed the OmniLED measurement system that combines a radiometer, spectrograph, and a selection of optical heads to offer fast, repeatable, NIST-traceable LED measurement. |
| 2006-09-20 | KKR group bows out of Freescale bidding A consortium of private equity firms led by Kohlberg Kravis Roberts & Co. said that it is no longer in discussions to acquire Freescale Semiconductor Inc., according to a Reuters report. |
| 2013-03-08 | Kilopass to augment tech roadmap with $8M funding Customer-led funding will enable Kilopass to expand its technology roadmap for next generation memory offerings. |
| 2002-04-03 | Jinghang membrane switch functions up to 50Vdc The company's membrane switches offer a flexible winding that allows easy installation when integrated with a vacuum tactile pushbutton switch and LED. |
| 2005-08-08 | Israeli graphics chip startup raises $4 million Israeli parallel-processing graphics chip start-up Lucid Ltd has secured $4 million of Series A financing in a round led by Giza Venture Capital and Genesis Partners, according to Giza Venture Capital. |
| 2008-06-06 | Isolated driver modules cater to high-intensity LEDs Rohm Electronics has introduced what it claims the industry's first AC/DC-isolated LED driver modules utilizing constant-current circuits optimized for driving LEDs. |
| 2006-10-12 | IR intros high-voltage buck regulator control IC International Rectifier has introduced a high-voltage, high-frequency buck regulator control IC for AC/DC offline, non-isolated applications requiring multiple LED circuits or requiring DC/DC color-mixing capabilities. |
| 2005-06-24 | Intel joins picoChip's $20.5 million funding round PicoChip Designs Ltd has raised $20.5 million in third-round funding, led by Scottish Equity Partners and joined by Rothschild and Intel Capital. |
Tech Watch
Research reveals self-assembling super-nano plastic fibers
The researchers studied a material made from copper and selenium that exhibits liquid-like behaviors due to...
Search EE Times Asia
