Friday, January 8, 2010

Hitachi Cable develops high-power 55-lumen red LED chips

TOKYO, JAPAN: Hitachi Cable Ltd has announced the development of a high-power red LED chip offering a maximum luminous flux of 55 lumens. This luminous flux was enabled by increasing the size of the LED chip and use of a fine line electrode structure.

LEDs are semiconductor solid-state components that convert electricity directly into light. With their capacity to emit light of a specific color without color filters and at low operating voltages, LEDs are used as indicator lights in a wide range of equipment, appliances, and devices.

Recent progress in luminous efficiency and the widespread commercial manufacture of blue and green LEDs has rapidly expanded the use of LEDs in full color display and illumination applications, including traffic lights, automobile rear signal lamps, and large outdoor display panels.

Hitachi Cable manufactures supplies aluminum gallium arsenide (AlGaAs) epitaxial wafers and aluminum gallium indium phosphorus (AlGaInP) epitaxial wafers, both of which are compound semiconductor wafers for red LEDs.

In response to demand for LEDs of higher luminous efficiency, the company has also developed a high-brightness red LED chips (hereafter referred to as an “MR-LED chips”) that form a metal reflector (MR) under the light emitting layer. This product is currently being supplied to LED package manufacturers and other customers.

Through its LED business, Hitachi Cable has recognized the growing demand for higher output LED chips. The company has incorporated fine electrode structures and enlarged chip dimensions to develop high-power red LED chips offering outputs as high as 55 lumens.

One of the methods of improving per-chip light output is to increase the chip dimensions. However, larger chips increase the difficulty in distributing a uniform current across the entire light emitting layer. On the other hand, if large electrodes are positioned in the upper layer of the chip for a more uniform current dispersion, light from the light emitting layer will be blocked, reducing the light extraction efficiency.

To resolve these problems in developing a new LED chip, instead of using larger electrodes, Hitachi Cable has utilized two pad electrodes for receiving power, a backbone electrode connecting the two electrodes, and multiple fine line electrodes that extend from the backbone electrode on the upper chip layer.

By employing fine line electrodes, Hitachi Cable has succeeded in achieving uniform dispersion of current across the entire chip surface without blocking light from the light emitting layer, thus attaining a maximum luminous flux of 55 lumens in a large LED chip measuring 1 mm by 1 mm—equivalent to the combined output of 21 MR-LED chips (0.33 mm x 0.33 mm). With its higher output, the new LED chip is expected to find applications not only in display applications, but also as a light source for devices such as projectors.

Hitachi Cable will continue to pursue active development of higher-power LED chips while expanding its lineup of high-power LED chips, including yellow and infrared LED chips.

austriamicrosystems LED driver ICs power LG Electronics new LED backlit TVs

CES, UNTERPREMSTAETTEN, AUSTRIA & LAS VEGAS, USA: austriamicrosystems, a leading global designer and manufacturer of high performance analog ICs for communications, industrial, medical and automotive applications, announced that LG Electronics, a leading provider of LCD TVs, has selected the AS3693A and AS3693B LED driver ICs for TV models being introduced at CES 2010 in Las Vegas.

The innovative AS3693 family helps facilitate extremely flat LCD TVs with the highest possible contrast ratios resulting in outstanding picture quality. A patented power saving technology actively regulates the LED power supply and minimizes power dissipation in the system. This makes very thin flat panel designs possible that are also very energy efficient. In addition, the entire portfolio has the industry’s best current accuracy -- to within +/- 0.5 percent -- resulting in excellent brightness uniformity.

“We are very proud of this intense cooperation and are fully committed to delivering best-in-class performance, cost-effective solutions and the most energy efficient technology to LG Electronics. austriamicrosystems’ AS3693 enabled LG Electronics to develop a very slim design with superb picture quality while at the same time achieving extremely low energy consumption. We will continuously innovate to further drive product designs in this fast growing market,” Markus Luidolt, marketing manager lighting at austriamicrosystems, stated.

A full range of LG Electronics TVs with the latest LED backlighting technology is being presented at CES. They offer picture quality without compromise in energy saving, ultra-slim designs. The AS3693 is optimized to support local dimming backlight for outstanding contrast ratios, and is already adopted in LG Electronics bestselling ultra flat borderless SL9000 and SL9500 TVs.

austriamicrosystems will demonstrate the AS3693 product line including the latest portfolio additions available in QFN, ePQFP and LQFP packages in an off-exhibition suite at the Consumer Electronics Show 2010 in Las Vegas.

Without a tech breakthrough, battery costs likely to limit widespread adoption of electric cars over next decade

DETROIT, USA: Although electric-car battery costs are expected to fall sharply over the coming decade, they are unlikely to drop enough to spark widespread adoption of fully electric vehicles without a major breakthrough in battery technology, according to a new study by The Boston Consulting Group (BCG).

The study concludes that the long-term cost target used by many carmakers in planning their future fleets of electric cars--$250 per kilowatt-hour (kWh)--is unlikely to be achieved unless there is a major breakthrough in battery chemistry that substantially increases the energy a battery can store without significantly increasing the cost of either battery materials or the manufacturing process.

"Given current technology options, we see substantial challenges to achieving this goal by 2020," said Xavier Mosquet, Detroit-based leader of BCG's global automotive practice and a coauthor of the study. "For years, people have been saying that one of the keys to reducing our dependency on fossil fuels is the electrification of the vehicle fleet. The reality is, electric-car batteries are both too expensive and too technologically limited for this to happen in the foreseeable future."

Most electric cars in the new decade will use lithium-ion batteries, which are lighter and more powerful than the nickel-metal hydride (NiMH) batteries used today in hybrids like the Toyota Prius.

Citing the current cost of similar lithium-ion batteries used in consumer electronics (about $250 to $400 per kWh), many original-equipment manufacturers (OEMs) hope that the cost of an automotive lithium-ion battery pack will fall from its current price of between $1,000 and $1,200 per kWh to between $250 and $500 per kWh at scaled production.

BCG, however, points out that consumer batteries are simpler than car batteries and must meet significantly less demanding requirements, especially regarding safety and life span. So actual battery costs will likely be higher than what carmakers predict.

Despite this cost challenge, the report projects steady growth for electric cars and batteries. Electric cars include mild and full hybrids (like the early Toyota Prius and 2010 Ford Fusion, respectively), which combine an internal combustion engine (ICE) power train with supplementary electric motors to run the car at idle and low speeds; plug-in hybrids and range-extended electric vehicles (such as the next-generation Prius and General Motors' Chevrolet Volt, respectively), which combine electric motors with a supplementary ICE to run the motors after the batteries have been depleted; and fully electric vehicles (like the Mitsubishi i MiEV and upcoming Nissan Leaf), which can only be recharged by plugging into the power grid.

Under the most likely scenario of the industry's evolution, BCG estimates that 26 percent of the new cars sold in 2020 in the major developed markets (China, Japan, the United States, and Western Europe)--or approximately 14 million cars--will have electric or hybrid power trains. That same year, the market for electric-car batteries in those regions will reach $25 billion.

"This burgeoning market will be about triple the size of today's entire lithium-ion-battery market for consumer applications such as laptop computers and cell phones," said Mosquet, noting that the forecast applies to all the components sold to OEMs for battery packs.

The report, titled Batteries for Electric Cars: Challenges, Opportunities and the Outlook to 2020, is a companion piece to a report BCG published in January 2009 on the future of alternative power-train technologies (The Comeback of the Electric Car? How Real, How Soon, and What Must Happen Next).

The new report's findings are based on a detailed analysis of existing e-car battery research and interviews with more than 50 battery suppliers, auto OEMs, university researchers, start-up battery-technology companies, and government agencies across Asia, the United States, and Western Europe. The report also draws on the firm's extensive work with auto OEMs and suppliers worldwide.

To show how battery costs will decline, BCG uses the example of a typical supplier of lithium-nickel-cobalt-aluminum (NCA) batteries--one of the most prominent technologies for automotive applications.

BCG's analysis suggests that by 2020, the price that OEMs pay for NCA batteries will decrease by 60 to 65 percent, from current levels of $990-$1,220 per kWh to $360-$440 per kWh. So the cost for a 15-kWh NCA range-extender pack would fall from around $16,000 to about $6,000. The price to consumers will similarly fall, from $1,400-$1,800 per kWh to $570-$700 per kWh--or $8,000-$10,000 for the same pack.

"Even in 2020, consumers will find this price of $8,000 to $10,000 to be a significant part of the vehicle's overall cost. They will carefully evaluate the cost savings of driving an electric car versus an ICE-based car against the higher up-front cost," explained Massimo Russo, a Boston-based partner and coauthor of the report. "It will be a complex purchase decision involving an evaluation of operating costs, carbon benefits, and potential range limitations, as well as product features."

Beyond costs, other key challenges facing the electric-car battery market are energy storage capacity, charging time, and infrastructure needs. BCG believes that pending a major breakthrough, batteries will continue to limit the driving range of fully electric vehicles to some 250-300 kilometers (about 160-190 miles) between charges.

As a result, fully electric vehicles that are as convenient as ICE-based cars--meaning that they can travel 500 kilometers (312 miles) on a single charge and can recharge in a matter of minutes--are unlikely to be available for the mass market by 2020.

Of the roughly 14 million electric cars forecast to be sold in 2020 in China, Japan, the United States, and Western Europe, BCG projects that some 1.5 million will be fully electric, 1.5 million will be range extenders, and 11 million will be a mix of hybrids.

"In view of the need for a pervasive infrastructure for charging or swapping batteries, the adoption of fully electric vehicles in 2020 may be limited to specific applications, such as commercial fleets, commuter cars, and cars that are confined to a prescribed range of use," the report concludes.

IR’s IR3870M SupIRBuck integrated voltage regulator simplifies design, maximizes system efficiency for DC-DC apps

EL SEGUNDO, USA: International Rectifier (IR), a leader in power management technology, has introduced the IR3870M SupIRBuck integrated voltage regulator for notebook and desktop computers, game consoles, consumer electronics applications such as set-top boxes, and general purpose point-of-load (POL) DC-DC converters.

The IR3870M features a hysteretic constant on-time modulator with adaptive dead-time control and on-state resistance (RDS(on)) current sensing to achieve maximum efficiency for notebooks. The IR3870M is capable of delivering up to 10A in environments with up to 60°C ambient temperatures and features diode emulation for improved light load efficiency.

The device also offers a charge pump output (CPO) option for enhancing the MOSFET gate drive to deliver highest efficiency at medium to full load conditions. In addition, the IR3870M has a wide input voltage range of 3V to 26V and can be programmed for output voltages of 0.5V to 12V by an external resistor divider network.

“As with all members of the SupIRBuck family, the IR3870M features IR’s latest advances in control IC, MOSFET and package integration technologies, and is an easy-to-use and fully integrated DC-DC voltage regulator designed to deliver maximum efficiency in systems that require light load as well as full load performance,” said John Lambert, IR’s POL products marketing manager, Enterprise Power Business Unit.

The IR3870M also features pre-bias start-up, very precise 0.5V reference, over- and under-voltage shut down, power good output, and enable input with voltage monitoring capability. The device also offers constant on-time control, programmable switching frequency, soft start, and over-current protection.

The innovative SupIRBuck family of versatile wide input, single output integrated point-of-load (POL) DC-DC voltage regulators integrates IR’s high performance control ICs optimized with benchmark HEXFET MOSFETs in a 5mm x 6mm, slim 0.9mm profile power QFN package. With a unique, scalable common footprint, SupIRBuck provides an easy to implement, flexible, compact, cost-effective, high performance POL solution.

The same feature-rich controller IC utilized in the IR3870M is also available as a stand-alone device, the IR3710M. This device allows designers who use the IR3870M for lighter loads to easily scale up to loads as high as 24A by using the IC with a pair of external IR MOSFETs.

Both the IR3870M and IR3710M are offered lead free and are RoHS compliant.

Diodes Inc. intros high voltage bridge-configurable diode array

DALLAS, USA: Diodes Inc., a leading global manufacturer and supplier of high-quality application specific standard products within the broad discrete and analog semiconductor markets, has introduced a miniature quad switching diode array, the MMBD5004BRM, which was designed for bridge implementation and ideally suited for Modem (Modulator-demodulator) tip/ring interface and general light duty offline rectification applications.

Designed for bridge implementation, this device eases interface to telephone tip/ring applications and complies with the FCC (telco) polarity requirements. The device’s high-voltage rating (400V) provides adequate margin over the maximum ringing voltage specified by the FCC and provides excellent tolerance to line transients.

The MMBD5004BRM’s miniature form factor SOT26 packaging helps enable cost and space savings in DSL, analog and DAA (Direct Access Arrangement) Modems, as well as answering machines and caller identification systems.

The diode array’s combination of fast switching speed and low junction capacitance makes it ideal for preserving high-speed signal integrity while its high current rating of 225mA continuous and 625mA peak provides a healthy margin for general light duty rectification applications.

A smaller quad diode implementation than many existing mini-bridge solutions, the MMBD5004BRM comes in a space-saving SOT26 package. Housing two separate pairs of series connected diodes for linking as a full-wave bridge rectifier, the diode array will suit applications where PCB size and cost are critical.

Thursday, January 7, 2010

Luminus Devices launches SBT-16 HB PhlatLight LED RB chipset for pico projector apps

LAS VEGAS, USA: Luminus Devices Inc., developer and manufacturer of high light output PhlatLight LEDs, today announced the availability of the SBT-16, the company’s newest PhlatLight LED available in a surface mount package (SMT). The SBT-16 is designed to bring new levels of efficiency and performance for personal and ultra-mobile projectors.

Personal and ultra-mobile projectors are an emerging class of miniature projection devices with sizes typically ranging from 150 to 400 cm3. These accessories may include digital media players and can connect to portable devices such as PDAs and notebook and Netbook computers to provide a large display experience.

The PhlatLight SBT-16 chipset includes separately packaged red, green and blue LEDs that are each 1.6mm2 with a 16:10 format which makes it a perfect illumination source for imagers ranging from 0.2” to 0.4” with wide format such as WVGA, 720p or 1080p resolutions. As all PhlatLight LEDs, the SBT-16 is matched to the system architecture to deliver optimum system efficiency in a compact form factor that is essential for personal projectors.

“We expect the pico and ultra-mobile projector market to grow to 3.4 million units by 2012,” said Mike Fisher, convergence and new technologies consultant at market research firm FutureSource.

“The introduction of higher brightness projectors enables new usage models and brings further versatility to this category, both of which are critical requirements for this market to materialize. By taking the pico hand-held accessory category to new performance levels, PhlatLight LEDs are an essential technology enabler for the category and Luminus is poised to expand its current leadership in projection displays to this consumer-driven category.”

“The PhlatLight LED SBT-16 chipset is a high performance, efficient LED, ideally suited for hand-held, battery operated personal projectors,” said Stephane Bellosguardo, director of product marketing, display business group, Luminus Devices. “Thanks to the SBT-16, pico projectors can now display larger screen sizes and can be used in higher ambient lighting conditions, which make them more practical and valuable both in consumer and business applications.”

The SBT-16 integrates seamlessly with standard SMT manufacturing processes and equipment. PhlatLight LEDs are compliant with the RoHS directive and unlike traditional projector lamps are free of hazardous materials such as mercury. Their high reliability, eliminates the need for light source replacement, resulting in a maintenance-free projectors. The SBT-16 is now sampling to lead customers.

Pioneer class-D amps package high power into compact design

LAS VEGAS, USA: Pioneer Electronics (USA) Inc. has introduced three new high-efficiency “GM Digital” series Class-D amplifiers, the 4-channel GM-D9500F and the monoblock GM-D8500M and GM-D7500M.

Inherent to Class-D amplifier design are vastly improved electrical and thermal efficiencies, allowing the amplifiers to produce the same power output as conventional amplifiers more than double their physical size. The new Pioneer GM Digital series Class-D amplifiers feature dynamic, balanced sound quality combined with high power output, all in an extremely compact chassis.

“While it is commonly understood that the addition of an external amplifier to an in-vehicle entertainment system can make the system play louder, the improvement in sound quality is often overlooked. An amplifier contributes to extended frequency response, greater dynamics and a less constricted sound overall,” said Ted Cardenas, director of marketing for the mobile business group of Pioneer Electronics (USA) Inc.

“The new GM Digital series Class-D amps are also very efficient and compact, allowing them to be installed practically anywhere in the vehicle.”