Lighting LED driver IC features

Crystal Semiconductor Co., Ltd. Feng Ming source Yen Chung-kuang, director of marketing for senior engineers stunned the world: the current common LED light source driver IC are borrowed from the common power supply IC, truly designed for the LED light source driver IC is still limited, many companies are in the design , is expected in 2010 may have a lot of the city can be. Currently LED) light-driven low-cost RC Buck program is unsafe, CCR can only drive 0.5w following LED, LDo method of driving with a regulator of the life of the LED light source negative: DC/DC- constant current source and AC / DC-current source may be the best known one of the options.

Throughout the DC LED light source drive technology, there are three types of driver IC will be the trend: one is the high-pressure process to produce the DC / DC Buck, Vin width to the DC60 ~ 100V. Constant precision of 1% will be able to meet all DC LED light-driven need to meet less and multi-string LED light source technology needs: the second category is the Ac / DCI of LED lighting application circuit requires simple, low cost application, able to live EMI, CE, UL's high-efficiency resonant half-bridge (LLC) + PFC topology-driven Ic; third is the power factor correction ((PFC) + pulse width control (pwM) two kinds of average current mode controller to form the new AC / Dc drive Ic. they will be a new generation of LEDlamps show its strong vitality, to give full play to the zero-voltage switching topology (ZVS) of the edge, and meet the LED lamps on the PFC (power factor more positive) the increasing demands and requirements at a lower power level (eg <50 w ) when efficiency> 90% wide input voltage, short circuit and over-power protection, open-circuit protection, low total harmonic distortion (THD) is the basic requirement.

Linear Technology's Tony Armstrong have similar views, he pointed out today, LED drivers Ic is one of the key performance must be able to fully adjust the LED light.Because the LED is driven with a constant current, the DC current value is proportional to the LED brightness, so to change the LED brightness, there are two by controlling the LED current dimming methods. The first is the analog dimming, by reducing the constant LED current. Proportionately lower LED DC current. LED current may cause the LED color changes, or not accurate LED current control. The second is a digital dimming or PWM dimming. PWM Dimming is equal to or higher than the switching frequency of 100Hz LED-off to such a frequency switching, no human eye can detect. PWM dimming duty cycle and LED brightness is proportional to the LED current is switched on to maintain the same value (eg, LED drivers set as Ic), and thus maintain a constant high dimming ratio LED color. In some applications, this PWM dimming method can be used to achieve up to 5000:1 dimming ratio.

Diodes Incorporated LED lighting manager AllanLin also believes that the future of LED driver technology is reflected in two aspects, he said, first, high power factor correction off-dimmable LED driver can replace halogen, incandescent and fluorescent lamps; first two. LED driver can replace low-efficiency halogen lamps.These two applications need to provide electricity and heat for the LED protection, to increase its durability. Other trends include the drive to optimize efficiency in order to provide the best, not the current maximum.

China as a global manufacturer. LED driver technology, manufacturing costs and overall BOM (BOM) costs is essential. To this end, Diodes feature is very committed to developing cost-effective LED driver technology.

Backlight

Intersil Corporation that: TFT (Thin Film Transistor) backlighting and other advanced applications require some additional features, including PWM dimming, DC dimming, local dimming, PWM-Dc dimming and direct PWM dimming. IntersiI called high-power multi-channel LED driver with a good degree of adjustment of light can be accurately 0.4% -100% dimming, matching is ± 1%.

Fairchild technical marketing manager Wayne Seto said. In China and the rest of the world, mobile phones from the charge pump LED driver circuit is connected in series architecture to boost infrastructure. Because the latter is not only efficient, but also to drive more LBD, to support a larger display screen. As smart phones and the growing popularity of large LED display, LED drive the demand for seven or more generally said benefits. The best way is to drive through the series of LED, the brightness of each LED so that the same; and because the charge pump is a parallel drive the LED, so no matter how small the screen, parallel-channel current (ie, brightness) will have a some differences. From the territory of more than seven LED design point of view, if the charge pump LED drivers, PCB (printed circuit board) layout would be more complex: while the use of series boost LED driver much easier. For cost-conscious mobile phone, is a linear LED driver

Direction of development, whichever circuit is simple, and easy to incorporated into the design. However, the charge pump solutions in cost-sensitive product areas and low-end phones in the still widely used.

LED TV

Samsung LED TV from the topic of success after the band, LED backlight used in television trends become the focus of concern, estimates the penetration rate in 2010 will have the opportunity to rise to 10% -15% .02, Micro Company Li Shengtaithat, due to the color rendering and contrast considerations, direct type backlight (Direct Type) LED TV has been the development direction of the axis: but the cost and design advantages of thin-driven, Edge (Edge TyVe) backlight is gradually into the mainstream of all LED Tv models at least 93% of the ratio. And focus on more than 40 inches TV size: therefore, the future prospects for LCD TV, LED TV will be one of the 2010 development of the spindle. LED TV products at this stage positioned in the high-end market, and LED-backlit LCD TVs used in the rise of one of the major challenges in its rate of spread with cCFL backlight: backlight side of the development, it has been substantially narrowed the distance between the two,But among the challenges still exist; It (BPSemi) marketing director noted, the third quarter of 2009, 40-inch and 46-inch LED-backlit LCD TV panel with the same size spread about 35% of CCFL is expected to be pulled the first quarter of 2010 close to 30% of the gap. In addition, a TV compared to notebook computer (NB) of the LED several times that amount; In other words, LED TV LED development has also affected the price of capacity development, and limited supply of the future if the LED chip sustained relief, can help sales price closer to the acceptable range of consumers, LED TV will have the opportunity as the current development of LED NB grow faster way.

Part of the LED drive vendor and product characteristics

Texas Instruments (TI) has a series of LED driver solutions, such as high power DC / DC boost LED driver (TPS61500), high-voltage DC / DC boost converter (TPS61 175), and step-down DC / DC converter (TPS62110 ) power management chip. All three products can support up to 18v input voltage and has a smaller voltage reference, to help improve the LED circuit design. In addition, these low-power products with multiple functions, can be widely used in signage, ambient lighting, office lighting, general lighting, medical and sensors, and other LED applications.

Intersil has a range of applications for a variety of Ic LED driver product line, including cars: high-end laptop, POS displays and display backlight: Handheld products: general lighting system. LED drivers can be configured into a non-inductive white LED driver for parallel LED, or an inductor-based white LED drivers, which are used in series of LED. Topology, including the boost regulator LED drivers, buck regulator LED drive, and buck-boost LED driver. For these applications. ISL97671.81 series can efficiently drive a wide range of meat 72pc (6-channel version) and 48pc (4-channel version), low power LED.

U.S. National Semiconductor (NS) z006 is the largest in the LED driver suppliers, the market share of over 14% of the company has a range of high technology products, is defined in the 100V range. Advantage of this high-pressure applications, including high efficiency, capable of driving multiple strings of LED (up 16 LED), can be used for automotive, industrial lighting, architectural lighting. 2D09 February, NS has introduced a new off-constant current controller - LM3445, advantage is that it can support with triac (TRL & C) forward or reverse phase control of the traditional tune into the wall optical device.

Fairchild (Fairchild) will focus on the development of semiconductor technology boost, and increase efficiency and functionality, and reduce the customer's design more difficult. Fairchild in the LED driver technology is the ability to understand customer needs and applications, in order to develop the best possible lighting solutions.

Linear Technology's high-brightness LED driver IC has the following typical characteristics: wide input / output voltage range: up to IOOV; high efficiency conversion: up to 95%: strict regulation of LED current matching: in the entire temperature range less than 2%, etc. . For example, LT3743 is a synchronous step-down DC / DC converter to provide constant current to drive high current LED and design. The new LT3754 solution to large flat panel with Deep-rooted homogeneous competition

For "light" town, in addition to lively markets such as bargaining, never will leave a good impression on people. Into the busy town, there are many excellent lighting companies, but more difficult is the streets, "light" humble little workshop. Whether consumers or dealers, the most afraid of is the homogenization of competition. With the streets of the "workshop" as a homogeneous communication channels, there is no way the market chaos. Three no's "workshop" provoking a sensitive nerve with the development of the industry, products, chaos, and chaos of the brand, price turmoil, the market also followed in turmoil, consumers kept, and so muddy, it seems difficult to clear by many companies self-cleaning. Many of the industry's leading companies have chosen to turn away, do not want to wade this muddy water. Op fled the town, Foshan Lighting in Foshan, Huizhou NVC choose entrenched.

Every industry, as long as there has been leading enterprises, in order to see a little bit of market discipline of hope, which is the usual mode of thinking people. On the domestic industry perspective view of traditional energy-saving lamps, home lighting, there are Op lighting; commercial lighting, there NVC; in addition to the Buddha on the lighting, TCL and a number of benchmarking of enterprise, the market is not as imagined it chaos. In addition, we can think from another perspective: Op, NVC, Foshan Lighting, TCL is how they become the industry benchmark for enterprise it?

Afraid of the bully market

LED lighting market is known as the emerging field of lighting a large cake. According to the relevant parties, in 2010 China's LED lighting industry output will exceed 150 billion yuan, doubled compared to 2008. Such rapid development of LED lighting market is the enterprise in the eyes of the meat and potatoes of each LED. So companies of fashion, thousands of brands on the market overnight. According to incomplete statistics, China's LED lighting companies close to 4000. In addition to the traditional energy involved in LED lighting lamps giants Op, thunder, etc. outside the enterprise, the domestic enterprise specializing in LED lighting only rectangular, really bright, Lehman, Saman, Road America, several relatively large. More people remember is the name of small business. LED lighting is not a long history, but it developed very rapidly, but is still not mature. Many small businesses do not know the brand depends on the true meaning of the exaggerated hype attitude, in pursuit of recognition for the purpose. Now on the market, LED prices are generally high, but the price difference is relatively large.

The industry started to worry, LED will not be a bum the next market?

With crystal light bully the market as a warning, a lot of lighting fixtures do not stop the business of the homogenization of competition afraid. The main source of homogeneous competition is anxious to display their copy, follow the trend of other bad behavior to achieve short-term benefits for the purpose, then there would be no then. Homogenization of the name of competition can only be walking a fine line for many companies, do not the real brand.

Deceptive advertising

Mr. Ye said the famous brand marketing experts as needed to support quality.

Open the search engine Baidu, the abundance of emerging LED lighting brand in front. Dazzling advertising ad pages and fits consumers made a difficult, sometimes difficult choices.

LED lighting is still in its infancy, he says, are often unrealistic hype. Without a strong after-sales service team and a good after-sales service system, and rely on fancy advertising can only deceive the consumer again. Say advertising is tonic, only at the appropriate time appropriate and pertinent ads targeted to the appropriate personnel will obtain the best results, otherwise like bricks.

Throughout the LED market, the traditional energy companies fought a strong LED lighting industry, is still able to obtain the trust of consumers, which only shows a good after-sales service is an important part of brand building.

Who gets the largest market in the end

The beginning of the LED lighting market is far from saturated. Is expected as early as 2015, LED lighting market share in China will reach 20%, driven by industrial scale up to 500 billion yuan. Such a large market with strong government support, LED lighting industry flourishing. Opportunity to prepare a good person, a long-term vision of the company will take precautions, rectangular lighting has moved into a new plant; really bright and beautiful market; Qinghua Science Park to spend heavily to build LED ... ... who is the LED lighting industry, the real dominant? We look forward to the LED market trends, and look forward to optimize the lighting industry quickly smoothly.