Multichannel constant current LED driver with high matching precision

Author

Yu, D.J. ; Liu, Y. ; Yu, Q. ; Wu, S.Y.

Author_Institution

State Key Lab. of Electron. Thin Films & Integrated Devices, Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2014

Firstpage

1

Lastpage

2

Abstract

Current mirror realized with resistance ratio and auto-zero technology with switch capacitor to reduce the influence of offset voltage are used to improve the matching precision. Without utilizing traditional current mirror the design simplifies the common current ratio circuit by multipliers of MOSFET in proportion. The output current matching precision of each output channel is nearly unaffected by the offset of each Operation Amplifier. The experiment results indicate that the method of multi output LED driver provides far great matching precision; it also has a simple design and has a smaller die size in layout.

Keywords

MOSFET circuits; constant current sources; current mirrors; driver circuits; light emitting diodes; operational amplifiers; MOSFET multiplier; autozero technology; current matching precision improvement; current mirror; multichannel constant current LED driver; offset voltage reduction; operation amplifier; resistance ratio; switch capacitor; Capacitors; Equivalent circuits; Light emitting diodes; Mirrors; Resistance; Resistors; Switches; Current Mirror; Current match; LED Driver; Resistance Ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Electron Devices and Solid-State Circuits (EDSSC), 2014 IEEE International Conference on

Type

conf

DOI

10.1109/EDSSC.2014.7061081

Filename

7061081