郭嘉帅, 王小力. 便携式系统中高效率、高精度、低噪声LED驱动电路设计研究[J]. 微电子学与计算机, 2010, 27(2): 80-84.
引用本文: 郭嘉帅, 王小力. 便携式系统中高效率、高精度、低噪声LED驱动电路设计研究[J]. 微电子学与计算机, 2010, 27(2): 80-84.
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GUO Jia-shuai, WANG Xiao-li. Design of High Efficiency High Accuracy and Low Noise LED Driver Used in Portable Application[J]. Microelectronics & Computer, 2010, 27(2): 80-84.
Citation: GUO Jia-shuai, WANG Xiao-li. Design of High Efficiency High Accuracy and Low Noise LED Driver Used in Portable Application[J]. Microelectronics & Computer, 2010, 27(2): 80-84.
shu

便携式系统中高效率、高精度、低噪声LED驱动电路设计研究

Design of High Efficiency High Accuracy and Low Noise LED Driver Used in Portable Application

    摘要
  • 摘要: 根据便携式系统应用要求, 设计了一种高效率、高精度、低噪声电荷泵 (Light Emitting Diode, LED) 驱动电路.设计采用1倍/1.5倍电荷泵升压方案, 驱动4个白光LED.改进的LDO (Low Drop Out) 电流控制电路将LED正向电流误差控制在3%以内, 同时使系统最高驱动效率达到90.16%.电荷泵电路设计采用8位线性反馈移位寄存器 (Linear Feedback Shift Register, LFSR) 产生的伪随机序列作为时钟信号, 明显实现了开关噪声29.94dB的衰减.设计基于主流CMOS工艺, 版图面积为1.51mm×1.14mm, 并流片.仿真结果验证了设计的可行性.该驱动电路易于实现便携式系统中不同模块的集成, 在实际应用中具有较大的参考价值.

     

    Abstract: In terms of requirements in portable application, this paper presents the design of high efficiency, high accuracy and low noise LED (Light Emitting Diode) driver circuit.1X/1.5X charge pump circuit is used to drive 4 LEDs.An improved LDO (Low Drop Out) current regulator circuit is designed to limited current error into 3% and achieves highest drive efficiency of 90.16% at the same time.Charge pump circuit design uses pseudorandom sequence generated by 8-bit LFSR (Linear Feedback Shift Register) .Switching noise is suppressed for 29.94dB.This design bases on IBM cmrf7sf 5V process, layout area is 1.51mm×1.14mm.It has been sent for tape out already.Simulation results prove the feasibility of this design.The LED driver designed is easy to be integrated with other modules in portable system and has a great value in practical application.

     

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