Title :
High efficiency LED driver featuring auto output-voltage tuning
Author :
Sun, Yue-Ming ; Wu, Xiao-Bo
Author_Institution :
Inst. of VLSI Design, Zhejiang Univ., Hangzhou, China
Abstract :
This paper presents a high efficiency LED driver that employs a current-mode buck regulator to energize four linear constant-current regulators. An auto-tuning procedure is introduced in to adjust the output voltage of buck regulator, which keeps the dropout voltage of the passive devices in linear regulators at a possible minimum level while maintaining high performance. Thus, the conversion efficiency of the linear regulator is maximized and so is the overall efficiency. A prototype of the high efficiency LED driver was designed with a standard 0.35μm CMOS process. The simulation results show that the expectant functions are well achieved.
Keywords :
CMOS integrated circuits; driver circuits; light emitting diodes; voltage regulators; CMOS process; LED driver; autooutput-voltage tuning; constant-current regulators; current-mode buck regulator; dropout voltage; linear regulators; passive devices; size 0.35 mum; Radiation detectors; Tuning; CMOS; LED; driver; high efficiency;
Conference_Titel :
Electron Devices and Solid-State Circuits (EDSSC), 2010 IEEE International Conference of
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4244-9997-7
DOI :
10.1109/EDSSC.2010.5713708
