| Summary: | 碩士 === 國立中山大學 === 電機工程學系研究所 === 103 === Nowadays, people raise the conscious of environmental protection in recent years. As a third of the total electricity consumption of all kinds of lighting, it’s a bigger problem that we needs to save energy. In recent years, the use of light-emitting diode (Light Emitting Diode- LED) have replaced the incandescent lamps and halogen lamps because the traditional incandescent bulb has short life of its usage and low luminous efficiency which do not meet the needs of energy saving policy. LED is environmental friendly without mercury materials and luminous efficiency. But the brightness of LED depends on the forward current, thus, the supplication of constant current becomes the most important topic of LED driving circuit. Normally the household light of dimming mainly use the bulbs and it only need to match the dimmer. However, it is not the fluorescent lamp. The dimmable LED can also adjust color via RGB lighting. Furthermore, LED extensively use in household lighting and medical usage. In the research, the power supply Vdd is 3.3V, the change of output current lower 3% when the temperature is -25 ℃ to 100 ℃. In the dimming control; the auto control can deliver the current via temperature sensor so as to control the output current which make people feel comfortable. Manual control can adjust the light by the users via low dropout liner regulator to meet the customers’ needs. It is fabricated with CIC provided by TSMC 0.35μm 2P4M 3.3V/5V CMOS process in an active area of 1.1 × 1.1 mm 2 . The total power dissipation is 0.48W.
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