Title :
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
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;
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
DOI :
10.1109/ICECS.2009.5410997
