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LED generic.jpgLED Lighting guides

Here in one neat package is our collection of key LED lighting articles, covering white LEDs, coloured LEDs, OLEDs and Lighting LEDs...

* White LEDs

* Coloured LEDs

* LED Lighting (1)

* LED Lighting (2)

* LEDs General

* LED Optics

* OLEDs

* Costing LEDs

* LED heatsinking

* 50 year history of the LED

One to note, maybe, from our Products section (Displays) - Kyocera has an 8.4-inch SVGA LCD module with an integrated LED driver circuit and LED backlighting with up to 70,000 hours of operating time.

The LCD has a viewing angle of 170 degrees.

Aimed at medical and industrial applications, the module comes equipped with an integrated LED driver circuit, so that no external components are required to drive the backlighting.

International Rectifier has launched a high-voltage buck regulator control IC for LEDs.

Rated at 600 V, the IRS2980 is the first in a family of high-voltage LEDrivIR ICs, and utilizes hysteretic average current mode control for precise current regulation. The LED buck driver features low-side Mosfet drive with high-voltage internal regulator and high-side current sensing. The converter is compatible with electronic PWM dimming allowing for 0%-100% current control.

ON Semiconductor is introducing a single channel LED driver tuned for low power applications such as portable handheld medical equipment, writes Steve Bush.

The CAT3661, which uses a patented architecture and integrates fault protection and fault diagnostics, is able to drive a single LED backlight with a current of up to 5mA. Soft-start current limiting and short-circuit protection make the new device ideal for use in equipment powered by coin cell batteries.

wrap-around-traffic-signals.jpgTwo Californian chip makers have announced their first forays into dimmable power factor corrected LED drivers, writes Steve Bush.

Linear Technology has produced a single-stage flyback design and iWatt - fabless producer of low stand-by phone charger chips - has plumped for a more traditional two-stage topology.


National Semiconductor has introduced a mains LED driver, claiming it to have "the industry's best phase-based dimming performance".

The chip, dubbed LM3450, includes active power factor correction and is aimed at fixtures between 10 and 100W.

Being phase-dimmable means that the resulting lamp will work with traditional wall dimmers.

Semtech has introduced an analogue timer chip that runs from 0.9V, but can drive LEDs at over 3V, writes Steve Bush.

Called SX8122, to the timer it adds: a simple battery charger, a boost converter, and a power-down controller.

"It is designed for on/off button debouncing, delayed start-up timing, programmable sequencing and timing-out in toys, remote control, electric toothbrushes, buzzers, and LED pointers," said Semtech.

sleeved LED kit.jpgSunpower's indoor LED driver can be dimmed with the type of dimmer aimed at incandescent bulbs.

Dimming range is claimed to be 1-100%, but will be less with poor quality dimmers.

Output is 9-24V at 700mA, or nominally 16W, input is 220-240V at 50-60Hz with a power factor of 0.8, and efficiency is claimed to be over 80%.

Guest columnist Jeff Gruetter, product marketing engineer for power products at Linear Technology outlines why high brightness LEDs require high performance LED drivers...

High brightness (HB) white LEDs (Light Emitting Diodes) are quickly replacing incandescent lighting in many home, institutional, government and industrial applications.

In many cases, the higher efficiency of the LEDs reduces power consumption by as much as 88%, dramatically reducing carbon emissions required to generate the electricity to power them.
Linear Technology has a 60V, 1MHz step-down DC/DC converter which is designed to drive up to 30 LEDs in a display, writes Richard Wilson.

From a 48V input, the LT3596 can drive up to three strings of LEDs, each with up to ten 100mA LEDs in series, delivering efficiencies of over 90%.

ON Semiconductor has an LED driver that integrates power factor correction (PFC) and isolated step-down AC-DC power conversion in a single stage, writes Richard Wilson.

Intended for LED-based street lighting and architectural lighting applications of between 40W and 150W, the NCL30001 is designed to operate in continuous conduction mode (CCM) and can be configured as either a constant current or fixed output voltage driver.

There is an adjustable operating frequency of 20 kHz to 250 kHz and a multi-function latch-off pin able to implement an overtemperature shutdown circuit.

Another feature is a high voltage start-up circuit, voltage feed forward which is designed to improve loop response.

Diodes has employed new forms of current control in its latest LED driver ICs which it said is designed to increase the reliability of high brightness lamps, writes Richard Wilson.

The ZXLD1370 LED driver controller operates in buck, boost and buck-boost topologies.

Toshiba Electronics Europe has announced an LED driver, the TC62D722, that can maintain constant currents of between 1.5mA and 90mA.

The 16-channel driver has a built-in PWM grey scale capability.

Austriamicrosystems has announced an inductive flash LED driver that drives up to 1000mA and which can be used for single or double LED designs, writes Richard Wilson.  

The high-side current source works with up to 2x500mA with two LEDs in serial configuration and up to 720mA with one LED.

LED Lighting guides

See also Electronics Weekly's roundup of content related to LEDs, with a special focus on both white LEDs and coloured LEDs, and Lighting LEDs.

* White LEDs

* Coloured LEDs

* LED Lighting (1)

* LED Lighting (2)

* LEDs General

* LED optics

* OLEDs

* Costing LEDs

* 50 year history of the LED








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Author Profiles

Paul Ward
As Opto Product Manager at Farnell, Paul is overseeing the company's involvement in the rapidly evolving and high profile LED lighting market sector.

As well as ensuring that Farnell offers the latest technologies and products related to solid state lighting, Paul is also responsible for ensuring that the resources are in place to make it easier for design engineers to specify and design-in LED solutions for their applications.

Educated in Production Engineering and Design at Sheffield Hallam University, Paul has worked in various engineering, training and marketing roles for companies including C&K switches, ITT Cannon, Cherry and LED specialist Chicago Miniature Lighting.

Away from the world of LEDs, Paul is a Founder of the charity RTTW, Photographer and Harley Davidson rider; he has ridden and snapped across Europe, New Zealand and the USA on his chrome hog!

Gordon Routledge
Gordon Routledge is one of the original pioneers in LED illumination having worked with LEDs in illumination applications since 1996. Currently VP of Illumination at Dialight, Gordon founded Lumidrives in 2001, having previously been managing director at ACDC Lighting Systems. Gordon has a degree in Electrical & Electronic Engineering from university of Manchester Institute of Science and Technology.

Ian Bryant
ian bryant.jpgIan Bryant is Business Development Manager LED Division at Carclo Technical Plastics. He has worked on and off at Carclo (Formerly Combined Optical Industrial) since leaving school. He has worked through the company from Toolmaking to starting the company on the road of LED optics business some 6-7 years ago, starting with a standard range and more in line with the business of custom optics. In between all this he has worked in engineering and as a works Director for a hydraulics company but kept getting pulled back to the optics industrial. We are able to offer the full solution from idea to parts so have a very good understanding on what is needed. You will see some posts from our design team also under my name.

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