At present, the development of LED driver technology will present a trend of high power, high reliability, comprehensive efficiency and power optimization, cost advantages and comprehensive cost performance, as well as high integration and small size. The main technical challenge of LED is how to truly achieve the long life of LED? How to improve the efficiency of power supply and EMC anti-interference ability? And how to get high power and reliability?
Lu Shiyong, the FAE manager of EUTECH in China, said that because LEDs are low-voltage, high-current-driven devices, they generate a lot of heat when applied, and their application environments vary. Therefore, they face the following technical challenges: LED driving Provide efficient and reliable power conversion solutions, such as the overall consideration of AC-DC power conversion and LED driver in TV, to provide a complete solution; in order to achieve higher system efficiency and solve heat dissipation problems, low on-resistance must be required, but LED strips require high voltage drive, and a compromise between high voltage, low on-resistance and cost is a technical issue.
Zhao Yichen, chairman and general manager of Riyuecheng, pointed out that based on the obvious advantages of LED and the continuous expansion of market applications, the future LED market will show two-stage growth. The first stage is investment and commercialization. The annual growth rate will remain at 20~30% in the next 3 to 5 years; the second stage will become consumer essentials after 3 years, and its annual growth rate will reach 50~80%. LED The popularity of the application market will simultaneously drive the steady and rapid growth of LED drivers.
He further stated that LEDs of different powers and applications require professionally corresponding LED driving technology. For example, LED screens and LED backlights require precise current and time control techniques to achieve brightness and grayscale characteristics, requiring efficient grayscale and color modulation techniques; while LED lights focus on fast lighting and more stringent light fades. Control, high power reliability and color temperature control technology, the use environment is even worse.
Lu Shiyong believes that the main application market for LEDs is lighting and backlighting. With the commercialization of high-brightness LEDs and the continuous decline in the unit price of LEDs, the popularity of LEDs in lighting and backlights has accelerated. Therefore, the demand for LED driver ICs is increasing. From the perspective of global LCD TV/display market shipments, 3.8 billion units were shipped in 2011, and the LED backlight penetration rate was 44%. In 2012, this data will exceed 70%, and the prospects are promising. EUTECH focuses on the LED backlight market (Figure 1), which offers LED backlighting solutions for LCD panels of all sizes from 3.5-inch smartphones to 46-inch LCD TVs. The combination of LED drive technology and AC-DC power supply technology provides an efficient and reliable overall solution, which is the future development trend of LED drive technology.
According to market applications, LEDs are mainly divided into DC power lighting for automotive and architectural decoration, AC power lighting for home/office, and backlight for LCD panels. The electrical characteristics of LEDs determine that they require constant current drive, but the requirements for LED driver ICs vary from application to application. Automotive DC power lighting focuses on product stability, reliability and safety, such as in the case of a short circuit of the power device can not be damaged or not allowed to smoke and fire. AC lighting for home/office emphasizes PF values, conversion efficiency, and system cost. LCD panel backlight design mainly considers the current matching between multiple LED strips, PWM dimming accuracy and linearity, LED short circuit / open circuit protection, power device short circuit protection, overheat / over voltage / over current / under voltage protection, etc. .
Riyuecheng has taken the following countermeasures for the LED driver challenge: precise and efficient patented drive technology; advanced PFC and EMI management technology; and excellent design and manufacturing technology. Zhao Yichen stressed that at present, there are many power chip suppliers joining the LED driver field, and the LED solutions are contending, and various programs are highly competitive. However, solutions based on power management chips have a common weakness, that is, the lack of LEDs. Real understanding and grasp. The advantages of Riyuecheng are: long-term LED drive technology development experience and a large amount of market experience accumulation; unique in power integration and product comprehensive efficiency; forming characteristics in EMI technology: constant current control and PWM modulation technology (Figure 2); and high reliability and quality control.
In response to the LED driver challenge, DXX uses an advanced high-voltage CDMOS process. Its on-resistance RSP and breakdown voltage BV have been specially optimized. Compared with the traditional BCD process, the high-voltage CDMOS process has no epitaxial wafers, which can provide better cost-effective products. At the same time, EUTECH can also provide customized solutions according to customer needs.
DXN's LED driver ICs have been used in LED backlights for mobile phones, MIDs, NBs, AIO computers, LCD monitors and LCD TVs. Compared with similar products, Dexin's products have the following characteristics: high reliability, peripheral device damage, short circuit protection, LED open/short circuit protection, overcurrent/overvoltage/overtemperature protection; LED current matching up to ±1.5% Dimming linearity is 1%~100%; opening time is as low as 2us, which can obtain excellent contrast; strong anti-interference ability, good suppression of ground noise caused by poor PCB layout; high conversion efficiency Up to 92%; built-in constant current source can reduce system cost. DXN LED flash drive is suitable for lens fill of more than 5 megapixels, with large output current (dual 1.5A output), simple peripheral application (only 1μH inductor, 3 ceramic capacitors and 1 resistor) and flexible application Convenient (with I2C interface, easy to configure various flash modes) advantages.
Finally, when talking about the upcoming LED driver products, Zhao Yichen said that Riyuecheng has continuously pushed new into LED driver technology, especially in LED screen drive technology and solutions. In the future, Sun Yuecheng's new LED driver products will mainly cover: cost-effective LED screen; innovative LED performance screen; high-density LED TV screen; low-power LED outdoor screen; high-reliability LED lighting drive and control; Cost-effective LED light drive, etc. Lu Shiyong said that for 42-inch LCD and 3D TV applications, EUTECH will soon introduce an 8-channel, 200mA/channel, 65V LED driver with built-in constant current source.
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