Stability analysis of a constant off-time peak-current mode LED driver

Author

Yan-Mou Chen ; Dan Chen ; Chung-Ping Ku ; Chun-Hung Lin

Author_Institution

Nat. Taiwan Univ., Taipei, Taiwan

fYear

2013

fDate

3-6 Nov. 2013

Firstpage

580

Lastpage

584

Abstract

A constant off-time peak-current-mode LED driver circuit provides not only accurate LED current control, but also relatively high power conversion efficiency, and is simple in circuitry. However, there is a feedback instability problem associated with the control scheme in practical circuits. A stability analysis concludes that the sample-and-hold device used in the control circuit causes this instability problem. A “slope compensation” scheme is proposed to alleviate this problem. Circuit simulation and experimental results validated the proposed scheme.

Keywords

circuit feedback; circuit simulation; circuit stability; compensation; driver circuits; electric current control; light emitting diodes; power convertors; sample and hold circuits; LED current control; circuit simulation; constant off-time peak-current mode LED driver; feedback instability problem; power conversion efficiency; sample-and-hold device; slope compensation scheme; stability analysis; Circuit stability; Integrated circuit modeling; Light emitting diodes; Mathematical model; Resistors; Sensors; Stability analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Future Energy Electronics Conference (IFEEC), 2013 1st International

Conference_Location

Tainan

Print_ISBN

978-1-4799-0071-8

Type

conf

DOI

10.1109/IFEEC.2013.6687572

Filename

6687572