LED Technology I Product News
New LED family handles drive currents to 70 mA for brighter signage, lighting and controls
A new family of LEDs in a PLCC-2 package that can handle higher drive currents and as a result can produce improved luminous intensity is the latest product released from the Optoelectronics group of Vishay Intertechnology. The new VLM.334 series LEDs, an advanced modification of Vishay's VLM.31 series LEDs, can incorporate larger chips and is capable of withstanding drive currents up to 70 mA.
The AEC-Q101-qualified VLM.334 LEDs are
offered in super red, red, amber, and yellow to serve a wide range of applications, including traffic signals and signs, interior and exterior lighting, automotive dashboard illumination, indicators and controls for audio and video equipment, LCD switches and symbols, illuminated advertising, and many other uses. Utilising the latest advanced AllnGaP technology, the VLM.334 series devices are able to provide exceptional brightness with a typical luminous intensity of 3760 mcd and maximum luminous intensity of 6052 at 70 mA while
delivering improved thermal performance compared to previous-generation LEDs. At 300 K/W, junction-to-ambient thermal resistance is 25% lower than the former VLM.333 product. The VLM.334 series LEDs are available in 8 mm tape. RoHS-compliant, halogen-free, and Vishay Green, the devices are compatible with IR-reflow soldering processes and preconditioned according to JEDEC Level 2a.
Vishay Intertechnology |
www.vishay.com
Mains-dimmable LED lamp driver raises device flexibility
Diodes Incorporated has unveiled the AP1694, an AC-DC controller providing a universal high- performance driver solution for a variety of mains-dimmable LED lamp designs. Suitable for both 120V and 230V AC inputs, while supporting non-isolated buck, buck-boost and isolated flyback topologies, the device enables between a 10% and 50% reduction in total BOM costs. The controller uses Diodes’ patented PFM technology to tightly regulate LED current and achieve a high power factor and low total harmonic distortion. By operating in boundary- conduction mode, the AP1684 also assures high efficiency and low EMI driver characteristics. As a primary side controller, this part removes the need for opto-coupler and secondary-side control circuitry, and being inherently stable, eliminates the need for loop compensation. The AP1694 delivers a 5% initial LED current
accuracy, meeting the requirements of most mains-dimmable LED lighting applications and is compatible with a wide range of different dimmers, including both leading edge and trailing edge types. It achieves deep dimming down to 1%, complies with the NEMA SSL6 standard for dimming curves and meets the requirements of the IEC6100-3-2 harmonic standard. Provided in the small form factor SO-8
Market for AMOLED light-emitting materials expected to surge in 2014
With a flood of new competitors set to initiate or increase the production of active-matrix organic light-emitting diode (AMOLED) panels next year, demand for materials used to make AMOLEDs is forecast to rise by nearly 27 percent in 2014, according to a new report from IHS.
The common layer materials include hole transport layer (HTL), hole injection layer (HIL), electron transport layer (ETL), electron injection layer (EIL), capping layer (CPL), charged generation layer (CGL), electron blocking layer (EBL), efficiency enhanced layer (EEL) and RGB prime layer materials.
Of these, the EBL and EEL materials are
The global market for AMOLED light- emitting materials is set to expand to $445 million in 2014, up from $350 million this year. According to the report entitled “Display Materials and Components Report - AMOLED Light-Emitting Material 2014” while growth this year will moderate compared to the 49 percent rise seen in 2013, the market will swell by about $100 million. “South Korea’s Samsung Display has successfully pioneered the AMOLED business during the last five years, attaining major success in the market for smartphone panels ranging in size from 3-inches to 5-inches,” said Doo Kim, principal analyst, display component and materials research. “Now other panel manufacturers are seeking to cash in on the expanding demand for AMOLEDs in smartphone, televisions and other products. This phenomenon will spur the continued increase in sales of materials used to create AMOLEDs in 2014.”
The organic light-emitting materials utlised in AMOLED panels can be largely divided into two categories: common functional layer materials and colour-emitting materials.
36 February 2014
hardly used at this time, while the CGL material is used only in white organic light- emitting diode (WOLED) panels. Materials such as PIN dopant are also adopted to improve efficiency. The colour-emitting materials are red, green and blue host and dopant materials. Yellow- green materials are used in WOLED. Samsung Display started the AMOLED market when it commenced large-scale mass production in 2008. Since then, it has led the AMOLED market’s expansion. In 2013, LG Display of South Korea launched a WOLED TV panel and a flexible AMOLED panel. Meanwhile, AU Optronics (AUO) of Taiwan introduced samples of small- to medium-sized AMOLED panels. Next year, LG, AUO and Japan Display (JDI)
are poised to commence or increase AMOLED panel production. As a result, light-emitting
package and requiring only 26 external components in buck topology, the AP1694 driver controller offers designers of mains-dimmable LED lamps a higher power density with a simpler and smaller total circuit footprint. The device also integrates comprehensive protection features, including open-load detection, over-voltage, short-circuit and over-temperature protection. The part is supported by 120V and 240V evaluation boards for qualifying customers, an on-line LED lamp component calculator tool and a complete set of reference designs.
Diodes Incorporated |
www.diodes.com
45W and 60W LED driver featuring 3-in-1 dimming
RECOM Lighting has introduced a new series of 45W and 60W LED drivers for constant current LED luminaires. The RACD45-A and RACD60-A series come with a 3-in-1 dimming function so that the modules can be controlled with analogue (1-10V), PWM, or external resistor dimming. The series operate with input voltages between 90VAC and 305VAC and include 4 different models with current outputs ranging from 700mA to 1850mA (RACD45-A) and from 1050mA to 4200mA (RACD60-A). Due to their IP67-rated enclosures, these
drivers are protected against dust and moisture so they can be installed in industrial or out- buildings as well as damp rooms like bathrooms or basements. These class 2 power supplies operate at temperatures ranging from -30°C up to 65°C, have efficiencies of more than 87% and feature low THD and an excellent power factor (>0.98 at 120VAC, >0.93 at 240VAC and >0.9 at 277VAC). The modules are fully protected against short circuit, overvoltage, and over temperature.
Commenting Steve Roberts, Technical Director RECOM, said: “With the flexible dimming options we are able to offer customers the usage of standard dimmers as well as to tailor the output current by using a simple resistor which could be placed at the light engine.” The LED drivers are UL8750 and EN61347 certified and comply with the European harmonics standard EN61000-3-2 Class C.
RECOM Lighting |
www.recom-lighting.com
Samsung announces Chip-on-Board LED packages
material makers are expected to compete in a more diverse market environment with increased demand and a broader base of customers. This will represent a marked change from the last five years, when they depended wholly on demand from Samsung Display.
IHS |
www.ihs.com Components in Electronics
Samsung Electronics has raised the light efficacy for its chip-on-board (COB) family of LED packages. The new LC013B, LC026B and LC040B feature a compact light emitting surface (LES) with high light output that is designed for use in high performance LED products. The improved COB type LC series offers a
light efficacy of 130lm/W at 3000K CCT (Correlated Colour Temperature) and 143lm/W at 5000K with a CRI (Colour Rendering Index) over 80. This represents a significant improvement from 120lm/W at 3000K and 129lm/W at 5000K
respectively, which Samsung has been offering with its LC series. Samsung’s LC series is Zhaga-compliant, making the packages highly convenient in assembling most LED lighting products including: downlights, spotlights and directional retrofits. By leveraging the chromaticity control
standard 3-step MacAdam ellipses, the LC series offer high colour uniformity and quality. The packages also provide low thermal resistance and superior heat dissipation which improves reliability.
The LC series has been available in 2700K, 3000K, 4000K and 5000K versions, with a 3500K version now added. Samsung’s latest LC series also offers a diversity of wattages coming in 13W, 26W and 40W versions depending on the LED product with which the packages are used.
Samsung Electronics |
www.samsung.com www.cieonline.co.uk
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