High performance white LED driver with single-wire serial-pulse digital dimming  

作　　者：YU Kai ZOU Xue-cheng LONG Shuang WANG Wei-xu 

机构地区：[1]Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China

出　　处：《The Journal of China Universities of Posts and Telecommunications》2009年第1期95-99,110,共6页中国邮电高校学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (60776027).

摘　　要：A high performance white light emitter diode （LED） driver based on boost converter with novel single-wire serial-pulse digital dimming （SWSP） is proposed. The driver uses external serial programmed pulses and internal clock to simplify brightness control By embedding a 5-bit digital analog converter （DAC） into the driver, wide dimming range is achieved. Moreover, a new dynamic slope compensation circuit is presented and other key circuits of the driver are optimized to get higher efficiency and fast transition response. A practical circuit is implemented with 0.6 um bipolar complementary-metal-oxide-semiconductor double-diffused-metal-oxide-semiconductor （BCD） technology. The simulation results show that the driver can provide both wide output current from 1.3 mA to 42 mA with 32-level digital dimming and higher efficiency up to 83% while it works at 1 MHz switching frequency with the input voltage variation from 2.7 V to 5.5 V.A high performance white light emitter diode （LED） driver based on boost converter with novel single-wire serial-pulse digital dimming （SWSP） is proposed. The driver uses external serial programmed pulses and internal clock to simplify brightness control By embedding a 5-bit digital analog converter （DAC） into the driver, wide dimming range is achieved. Moreover, a new dynamic slope compensation circuit is presented and other key circuits of the driver are optimized to get higher efficiency and fast transition response. A practical circuit is implemented with 0.6 um bipolar complementary-metal-oxide-semiconductor double-diffused-metal-oxide-semiconductor （BCD） technology. The simulation results show that the driver can provide both wide output current from 1.3 mA to 42 mA with 32-level digital dimming and higher efficiency up to 83% while it works at 1 MHz switching frequency with the input voltage variation from 2.7 V to 5.5 V.

关 键 词：White LED driver boost converter single-wire serial-pulse digital dimming dynamic slope compensation 

分 类 号：TN312.8[电子电信—物理电子学] TM44[电气工程—电器]