Title :
A new analog dimming circuit used in LED driver
Author :
Lingling Feng ; Yingna Zhou ; Yong Peng ; Wei Li
Author_Institution :
Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A new analog dimming circuit used in LED power supply was presented. An adjustable duty cycle oscillation signal controlled by external input could change the reference voltage which decided the duty cycle of PWM, then adjusted the output current of LED power supply linearly. Besides, a DAC (Digital Analog Converter) had been used to eliminate the reference voltage jitter which made the dimming more precise. Simulation using Hspice based on TSMC_ 0.5μm BCD process, showed that the linear dimming circuit could control the current of load accurately, and achieved linear dimming LED lights.
Keywords :
SPICE; analogue circuits; driver circuits; light emitting diodes; power supply circuits; BCD; DAC; Hspice; LED driver; LED power supply; analog dimming circuit; digital analog converter; linear dimming circuit; size 0.5 mum; Abstracts; Light emitting diodes; Pulse width modulation; DAC; LED power supply; adjustable duty cycle; linear dimming;
Conference_Titel :
Solid-State and Integrated Circuit Technology (ICSICT), 2014 12th IEEE International Conference on
Conference_Location :
Guilin
Print_ISBN :
978-1-4799-3296-2
DOI :
10.1109/ICSICT.2014.7021413
