A high efficiency boost white LED driver for portable electronics applications

2010 International Symposium on Next Generation Electronics Pub Date : 2010-12-17 DOI:10.1109/ISNE.2010.5669135

Y. Hsieh, Bin-Da Liu, Jian-Fu Wu, Chiao-Li Fang, H. Tsai, Y. Juang

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引用次数: 7

Abstract

Power efficiency is a very important issue for portable electronic devices since it determines the battery life. The backlight module usually accounts for the major part of power dissipation in a portable device. Thus, to extend the operation time of a portable device, a high efficiency backlight module should be employed. White light-emitting diodes (WLEDs) have replaced cold cathode fluorescent lamps as backlight modules in portable electronics in recently years due to their superior power efficiency. This paper presents a high efficiency WLED driver with an integrated boost DC-DC converter that can drive a series of WLEDs using a single lithium-ion battery, which is the most popular power source for portable devices. As unexpected operation conditions can result in the failure of the driver, battery, or inductor, the driver integrates protection circuits for over current, over voltage, and under voltage. The driver was fabricated in the TSMC 0.25-µm 60-V bipolar-CMOS-DMOS process. The over current protection level is set to 2 A. The over voltage protection is set to 50 V, allowing the boost converter to drive 12 WLEDs in series connection. The under voltage protection circuit turns off the converter when it detects an input voltage below 2.5 V to protect the battery.

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用于便携式电子应用的高效率升压白光LED驱动器

对于便携式电子设备来说，电源效率是一个非常重要的问题，因为它决定了电池的寿命。背光模块通常占便携式设备功耗的主要部分。因此，为了延长便携式设备的工作时间，需要采用高效的背光模块。近年来，白光发光二极管(wled)以其优越的功率效率取代冷阴极荧光灯作为便携式电子产品的背光模块。本文提出了一种高效WLED驱动器，该驱动器具有集成升压DC-DC转换器，可以使用单个锂离子电池驱动一系列WLED，这是便携式设备中最流行的电源。由于意外的操作条件可能导致驱动器、电池或电感失效，驱动器集成了过流、过压和欠压保护电路。驱动器采用台积电0.25µm 60 v双极cmos - dmos工艺制造。过流保护设置为2a。过压保护设置为50 V，允许升压转换器驱动12个wled串联连接。欠压保护电路在检测到输入电压低于2.5 V时关闭转换器以保护电池。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2010 International Symposium on Next Generation Electronics

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