Summary
　　 With the continuous advancement of human society, science and technology continue to improve. Humans are paying more and more attention to the efficiency of energy use. For light sources, humans have a special preference. With the generation of semiconductor light-emitting devices, the efficiency of fluorescent lamps cannot meet the demand. A new generation of lighting devices is bound to be born.
This paper studies the high-power illumination LED constant current drive. A brief introduction to the history of LED development, evaluation of its development value and trends, especially the energy efficiency of LED. Based on the LT3466 chip of Linear Technology, a brief analysis was carried out to develop a small LED lighting system.
Chapter 1 Preface
1.1 History of lighting devices
Throughout the development of human lighting history, it has mainly experienced three stages: flare lighting, incandescent lighting, and fluorescent lighting. With the breakthrough of GaN in the new generation of semiconductor materials, the development of high-brightness blue and green light-emitting diodes, especially white light-emitting diodes (LEDs), the development of semiconductor technology has ignited a new industrial revolution after the microelectronic revolution. - Lighting revolution. White LED light sources are expected to be the fourth generation of light sources after incandescent, fluorescent and high-intensity discharge lamps. Research and in-depth understanding of the application of LED in the field of lighting is a new topic we are facing.
The luminescence mechanism of a semiconductor solid-state light-emitting device is that when electrons and holes are recombined in some specific active regions in the semiconductor, photons are generated, and the energy of these photons is related to the forbidden band width of the semiconductor. Since the first batch of LEDs entered the market in 1968, it has been nearly 40 years. With the development of new materials and the improvement of processes, LEDs tend to be brighter and full-color. The emergence of GaN blue LEDs has expanded the field of LED applications.
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