Title :
A high efficiency boost white LED driver with an integrated Schottky diode
Author :
Hsieh, Yuan-Ta ; Liu, Bin-Da ; Jian-Fu Wu ; Fang, Jian-Fu ; Hann-Huei Tsai ; Juang, Ying-Zang
Author_Institution :
Dept. of Electr. Eng., Nat. Cheng Kung Univ., Tainan, Taiwan
Abstract :
Size and battery life are important issues for portable devices. White light-emitting diodes (WLEDs) have thus replaced cold cathode fluorescent lamps as backlight sources. Since WLEDs are small and highly efficient, a good WLED backlight driver design can reduce the size of portable devices and extend their operation time. This paper proposes a high efficiency boost WLED driver with an integrated Schottky diode. The DC-DC converter structure allows high efficiency and the on-chip compensator and Schottky diode reduce the board area. The driver also enhances the substrate noise immunity. The simulation results show that the substrate noise was reduced from ±1.8 to ±0.8 V. The driver was fabricated in the TSMC 0.25-μm bipolar-CMOS-DMOS process. For a load of six VLEDs at an input voltage of 4.3 V, the power efficiency was 91.6%.
Keywords :
CMOS integrated circuits; DC-DC power convertors; Schottky diodes; driver circuits; light emitting diodes; DC-DC converter structure; TSMC bipolar-CMOS-DMOS process; battery life; boost white LED driver; integrated Schottky diode; on-chip compensator; portable device; size 0.25 mum; substrate noise immunity; voltage 4.3 V; white light-emitting diode backlight driver design; WLED driver; high efficiency; integrated Schottky diode; on-chip compensator;
Conference_Titel :
Circuits and Systems (APCCAS), 2010 IEEE Asia Pacific Conference on
Conference_Location :
Kuala Lumpur
Print_ISBN :
978-1-4244-7454-7
DOI :
10.1109/APCCAS.2010.5775089
