LED drive technology innovation efficiency is the main goal of continuous improvement

Lighting and backlight LED technology is currently the largest two applications, and LED driven technology innovation is the driving force for the popularization of these two applications. In recent years, LED driven by linear adjustment (LDO), charge pump type to switch type, in efficiency, current drive capability has made great progress, efficiency is also greatly improved. With the development of semiconductor technology, especially the improvement of high voltage MOSFET and BCD technology, some of the peripheral power switches and diodes are integrated into the drive chip, so that the peripheral circuit is greatly simplified. Cheng Baohong, chief executive officer and President of Technology Co., ltd..

LED drive technology along with the progress of LED light-emitting chip, making the power of LED is more and more big, the brightness is higher and higher, its application is becoming more and more widely. From the early instrument into the LCD screen backlight, flashlight, automotive lighting, decorative lamp indicator, etc., until the field of general lighting, such as lamps, bedside lamp, fluorescent lamp and lamp etc..

In recent years, the progress in the process and design to enhance product functionality, but also increased the scope of application of LED. "Richtek marketing department deputy director Chen Juncong said," such as the reduction of external components but also reduce the volume of the product and application sheet. Process technology to make the product can load more current and voltage, and thus support more LED parts, which are helpful in LED applications. And because of the reduction in volume, LED can also be applied to the flash on the phone. The increasing luminous efficiency of the LED can be used as a projector light source, these innovative applications can be said to be complementary to the progress of the process and design. "

Canton core electronic technology (Shanghai) Co., Ltd. sales director Xing Chaoyong also believes that in recent years, the progress of LED driven technology is mainly manifested in the high efficiency, high power, high pressure technology. In the field of mobile phone and other portable, mainly white LED driver applications, low dropout, now driving charge pump driver is driving mode developed for these applications, low dropout drive can put pressure to do so very low (50mV/20mA), charge pump drive is now 2 times, 1.5 times, 1.33 times so, the purpose is to improve efficiency, increase the range of voltage application. The company has launched the industry's first innovation at the same time a total of yin and Yang drive LED low dropout driver chips, will launch a charge pump and drive a total of yin and Yang LED driver soon, allegedly this chip can use only one external capacitor 1X to automatically adjust the voltage between the 2X, this will greatly improve the efficiency of LED.

Xing Chaoyong stressed: "LED technology itself also has rapid progress, now the luminous efficiency of LED is improved greatly, the turn-on voltage is lower, so the high brightness LED now used more and more widely, but the most important is the backlight and lighting innovative applications. "

LED lighting manufacturers become the main market

"Efficiency is the key issue for lighting applications. Invar number and large output current and high temperature problems are needed to improve, but also improve the product key. Chen Juncong said.

"The biggest problem of LED driver is the heat consumption and its reliability. This requires the driver chip to further reduce their own power consumption, reduce their fever. At the same time, due to the high current and high power applications, the voltage overshoot, the ground bounce and the static protection of the driver chip need to be handled in order to improve the reliability of the system. In addition, the driving technology to solve the seamless connection with the current AC drive, thereby reducing the resistance and cost pressures to LED lighting conversion, but also a challenge. Cheng Baohong pointed out that the u.s..

He believes that with the LED solid state lighting technology performance and efficiency continue to go beyond the traditional lighting technology, this new technology is widely used. However, if we only use static white LED to replace the traditional technology, it is difficult to really play the full potential of solid-state lighting technology, can not fully achieve the characteristics of LED lighting products. The intelligent driver support, such as the introduction of wireless control, automatic light detection and microprocessor technology, LED lighting can not only replace the traditional white light illumination, but also achieve new functions, and these functions with the traditional lighting technology is difficult to achieve.

Driver IC package is also in progress

"In the future LED power applications, we need to package the myriads of changes, international LED manufacturers like CREE, Nichia, Lumileds, OSRAM and other design source products is only for us to adapt to him, the same package home advantage is not obvious, in order to obtain the considerable development, this kind of situation must be changed. Shenzhen long express Integrated Circuit Design Company LED development and Planning Manager Wen Maoqiang said, Shenzhen express is leading an important innovation. "

According to him, the recent long express will announce a major innovation in LED driven technology, namely power LED constant current integrated packaging technology. This technology is based on the LED packaging technology based on the direct integration of low dropout linear constant current technology, LED can be directly to the nominal voltage specifications, such as 24V, 36V, 48V. When the system manufacturer uses this package to develop the product, it will no longer need to consider any problem with the LED constant current, using the existing power supply, "this technology will declare the end of the LED constant current power supply. Wen said. On the basis of the original IC design, the company has invested 50 million yuan in Xi'an to produce a power LED constant current integration