Research and design of a white LED driver chip applied in backlight

Author

Yang, Yi-Zhong ; Xie, Guang-Jun ; Xu, Hui-fang ; Wei, Sheng-tao

Author_Institution

Sch. of Electron. Sci. & Appl. Phys., Hefei Univ. of Technol., Hefei, China

fYear

2010

Firstpage

506

Lastpage

508

Abstract

A white LED driver chip applied in backlight is proposed, which is based on pulse width modulator. The design of modules such as current reference, oscillator and dynamic slope compensation are discussed in detail. The simulation results, based on CSMC 0.5μm BCD technology, show that the input voltage is in the range of 3.3~5.5V, the output voltage is up to 20V when the output current is between 15 ~ 60mA, which can drive 2~6 white LEDs in series with the conversion efficiency 88%. Characteristics such as the overall circuit loop stability, dynamic characteristics, load capacity are well satisfied the design requirements.

Keywords

light emitting diodes; pulse width modulation; CSMC BCD technology; backlight application; circuit loop stability; current reference; dynamic slope compensation; efficiency 88 percent; load capacity; oscillator; pulse width modulator; size 0.5 mum; voltage 20 V; voltage 3.3 V to 5.5 V; white LED driver chip; Converters; Driver circuits; Inductors; Layout; Light emitting diodes; Simulation; Temperature; LED; current control mode; dc-dc Converter; pulse width modulator;

fLanguage

English

Publisher

ieee

Conference_Titel

Solid-State and Integrated Circuit Technology (ICSICT), 2010 10th IEEE International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-4244-5797-7

Type

conf

DOI

10.1109/ICSICT.2010.5667362

Filename

5667362