High-efficiency low-ripple LED driver based on buck-boost converter

被引：0
|
作者：
Chen X. [1 ,2 ]
Dong Y. [1 ,2 ]
He S. [1 ,2 ]
机构：
[1] School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan
[2] Shenzhen Institute of Huazhong University of Science and Technology, Shenzhen, 523000, Guangdong
来源：
Huazhong Keji Daxue Xuebao (Ziran Kexue Ban)/Journal of Huazhong University of Science and Technology (Natural Science Edition) | 2019年 / 47卷 / 03期
关键词：
Auto zeroing; High efficiency; Light emitting diode (LED) driver; Noninverting buck-boost converter; Smooth modes transition;
D O I：
10.13245/j.hust.190315
中图分类号：
学科分类号：
摘要：
The LED driver control circuit was designed and implemented based on noninverting buck-boost converter. The control circuit not only achieved the smooth modes transition from Buck to Boost, but also reduced the average inductor current in the Buck-Boost transition mode and improved system efficiency. Furthermore, an auto zeroing error amplifier was designed to reduce input offset voltage and flicker noise, which improved output current accuracy. The driver, implemented in a 180 nm CMOS technology, achieves percentage output current ripple of less than 3% when output current is 850 mA and the input voltage ranges from 2.7 V to 5 V, and gets the maximal efficiency of 95% when load current is 150 mA and input voltage is 5 V. © 2019, Editorial Board of Journal of Huazhong University of Science and Technology. All right reserved.
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页码：88 / 92
页数：4
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