一种用于白光LED驱动的电荷泵的设计  

Design of Charge-Pump for White LED Driver

作　　者：徐静萍[1] 

机构地区：[1]西安邮电学院电子工程学院,西安710121

出　　处：《半导体技术》2011年第10期795-799,共5页Semiconductor Technology

基　　金：陕西省教育厅专项科学研究项目(2010JK817);西安邮电学院中青年基金资助项目(ZL2009-14)

摘　　要：提出了一种可用于白光LED驱动芯片的电路设计,主要从低噪声、高效率两方面进行设计。采用线性模式控制方法,最大限度减小电荷泵电源电流纹波,从而降低噪声,同时应用多增益工作模式提高不同输入电源电压下的效率。详细讨论了其中带隙电压基准、振荡器及跨导放大器三大模块的电路结构、工作原理和性能特点。采用此电荷泵电路的芯片已在CSMC0.6μm CMOS工艺线投片,测试结果表明,该电荷泵电路工作良好,有效减小了PCB面积和降低了噪声,并且在不同输入电源电压下均能保持较高效率,输出在200 mA时,效率可达92%。A charge-pump circuit for white LED driver with low noise and high efficiency was introduced.The supply power current was decreased by the linear-mode control method to reduce noise.Mea nwhile,the multimode operation was adopted to improve the efficiency at different s upply voltages.The general structure,principle and features of three module ci rcuits were discussed in detail,such as bandgap voltage reference,oscillator and transco nductance amplifier.A chip employing the charge pump was implemented in CS MC 0.6 μm CMOS process.The results show that the charge pump works well to reduce the area of PCB board and noise effectively.The efficiency can b e kept high enough at different input supply voltages,and it is up to 92% at 200 mA.

关 键 词：白光LED 电荷泵 低噪声 高效率 互补型金属氧化物半导体 

分 类 号：TN312.8[电子电信—物理电子学] TN432