Efficienct LED driver with an adaptive reference tracking technique

Author

Hsieh, Chun-Yu ; Wei, Young-Sheng ; Chen, Ke-Horng ; Lin, Tseng-Chun

Author_Institution

Dept. of Electr. & Control Eng., Nat. Chiao Tung Univ., Hsinchu, Taiwan

fYear

2009

fDate

13-16 Dec. 2009

Firstpage

291

Lastpage

294

Abstract

An adaptive reference tracking driving technique is proposed to minimize the boost output voltage oscillation and improve the power efficiency when the digital pulse width modulation dimming is enabled. An asynchronous 1 MHz DC/DC converter with a dynamic resistor implements the minimum voltage reference tracking technique. Therefore, high efficiency and a stable boost output voltage can be guaranteed whether the LED strings turn on or off. The test chip was simulated by TSMC 0.25 um BCD 40 V to demonstrate high efficiency and the stable boost output voltage. Simulation results show the oscillation output voltage can be minimized from 1.4 V to 0.2 V.

Keywords

DC-DC power convertors; PWM power convertors; driver circuits; light emitting diodes; resistors; LED driver; adaptive reference tracking driving technique; asynchronous DC/DC converter; boost output voltage oscillation; digital pulse width modulation dimming; frequency 1 MHz; power efficiency; size 0.25 mum; voltage 1.4 V to 0.2 V; voltage 40 V; Brightness; Circuits; DC-DC power converters; Digital modulation; Light emitting diodes; Power dissipation; Pulse width modulation; Regulators; Space vector pulse width modulation; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits, and Systems, 2009. ICECS 2009. 16th IEEE International Conference on

Conference_Location

Yasmine Hammamet

Print_ISBN

978-1-4244-5090-9

Electronic_ISBN

978-1-4244-5091-6

Type

conf

DOI

10.1109/ICECS.2009.5410997

Filename

5410997