Title :
A novel multiple modes PWM controller for LEDs
Author :
Jiaying Lu ; Xiaobo Wu
Author_Institution :
Inst. of VLSI Design, Zhejiang Univ., Hangzhou, China
Abstract :
A monolithic controller for pulse width modulation (PWM) DC-DC converter was presented in this paper. The controller was designed specially for LED (light emitting diode) driver circuit with four operation modes, current feedback mode, constant current mode, no sense resistor mode and PWM dimming mode. The controller can be adapted to almost all current DC-DC topologies such like Boost, Buck-Boost and etc.. It also features the different load current sense methods for different topologies. For LED lighting, both the digital and analog dimming modules were integrated onto the chip, which were used to meet the demands of two kinds of dimming applications respectively. The controller integrated circuit (IC) was designed, simulated and fabricated in 1.5 mum BCD process. And both the simulation and test results were consistent with expectations well.
Keywords :
BIMOS integrated circuits; DC-DC power convertors; PWM power convertors; driver circuits; integrated circuit design; light emitting diodes; lighting; BCD process; DC-DC converter; LED driver circuit; LED lighting; PWM dimming mode; analog dimming modules; constant current mode; controller integrated circuit design; current feedback mode; digital dimming modules; light emitting diode; monolithic controller; multiple modes PWM controller design; no sense resistor mode; size 1.5 mum; Circuit topology; DC-DC power converters; Driver circuits; Integrated circuit modeling; LED lamps; Light emitting diodes; Lighting control; Pulse width modulation; Pulse width modulation converters; Resistors; LED driver; PWM controller; PWM dimming; current sense methods;
Conference_Titel :
Circuits and Systems, 2009. ISCAS 2009. IEEE International Symposium on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-3827-3
Electronic_ISBN :
978-1-4244-3828-0
DOI :
10.1109/ISCAS.2009.5118118
