手机白光LED驱动电路解决方案分析（Analysis of mobile white LED drive circuit solution）.docVIP

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手机白光LED驱动电路解决方案分析（Analysis of mobile white LED drive circuit solution）.doc

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手机白光LED驱动电路解决方案分析（Analysis of mobile white LED drive circuit solution） Analysis of mobile white LED drive circuit solution A major trend in mobile phone display from monochrome to color is the integration of shooting capabilities. Initially, the resolution of these imaging devices was rather limited and the image quality was poor. But as technology advances, the resolution advances from the VGA level of 300 thousand pixels to 100 to 2 million pixels, and rapidly moves toward resolution levels above 3 million pixels. After the improvements in imaging devices, processors and software, consumers now want to get more digital camera features, such as flash lights in low lighting conditions, or even autofocus. In this resolution, the quality of output and good pictures and video sharing becomes more practical, the CMOS imaging device for high density required to obtain more reflected light from the target, thus further promote the integration of the flash function demand. New requirements for LED driver design To put the traditional xenon flash to mobile phone quite compact size for design engineers, challenging, because in addition to large flash using high voltage capacitor, must add the bulb and associated transformers and electronic circuits, while the traditional flash is not suitable to use the video shoot. Thankfully, LED manufacturers have begun to light up the power LED by employing new materials such as indium gallium nitride (InGaN). Figure 1: inductive LED driver circuit based on NCP5005 On the other hand, innovations in semiconductor manufacturing and improvements in packaging methods also increase the number of lumens that can be generated and the efficiency of the photoelectric conversion. To produce the highest light output, these power LED may require 400mA or higher, and pulse width of 50 to 200ms current output capability. But for video applications, smaller currents are needed, but time is not limited to single pulses. In addition to size restrictions