Integrated Multi-channel High Accuracy Current Control LED Driver with Low Dropout Regulator
Integrated Multi-channel High Accuracy Current Control LED Driver with Low Dropout Regulator作者机构：Department of Electrical Engineering National Taipei University Taipei 23741 Taiwan
出 版 物：《Journal of Energy and Power Engineering》 (能源与动力工程（美国大卫英文）)
年 卷 期：2013年第7卷第3期
页 面：583-588页
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 0803[工学-光学工程]
主 题：LED driver low dropout regulator multi-channel dimming control.
摘 要：This research describes an integrated multi-channel high accuracy current control LED （light emitting diode） driver with low dropout regulator implemented in a 0.35μm TSMC 2P4M CMOS process. With the new trend of backlighting applications for mobile electronics and portable devices requiring a smaller size, lower cost, lesser noise and accurate current control LED driver, it came up with the idea of integrating more than one design features within a single chip. The analysis of using a capacitor-less low dropout regulator to power the constant current source has been explored, with the implementation of wide range battery voltage of 3 V to 5 V. Possible load current variations were introduced and verified to output a fixed voltage of 2.8 V. A regulated cascode current mirror structure forms the multi-channel configuration string of LED＇s; the design ensures a current matching of less than 1% error and achieves a high accuracy current control of less than 1% error, regardless of the LED＇s forward voltage variation. Moreover, for high end portable device with multimedia applications, dimming frequency can be set to 10 MHz. In addition, a switching output is a better approach for managing LED＇s contrast and brightness adjustment as well as maximizing power consumption, ensuring longer life for driving string of LEDs.
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