一种基于DC/DC变换器的LED驱动电路的设计  

Design of LED Driver Based on DC/DC Converter

作　　者：徐祥柱[1] 王会影[1] 刘小龙[1] 王慧芳[1] 周泽坤[1] 张波[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,成都610054

出　　处：《微电子学》2012年第2期173-176,共4页Microelectronics

摘　　要：提出一种基于电流模式DC/DC变换器的驱动控制电路。该电路可以与恒流电路结合在一起,用作LED驱动。电路由误差放大器、斜坡信号产生电路、电流采样与叠加电路以及PWM比较器四部分构成。采用华虹BCD350工艺进行仿真验证,结果显示,电路成功实现了电流采样信号与斜坡补偿信号的叠加,在Vea信号的控制下,输出了控制功率管关断的PWM脉冲信号。A drive control circuit based on current-mode DC-DC converter was presented,which,combined with constant current circuit,could be used as LED driver.The circuit consisted of error amplifier,slope generating circuit,current sensing and summation circuit,and PWM comparator.Simulation based on Huahong＇s BCD350 process showed that the circuit successfully realized summation of current sampling signal and slope compensation signal,and output PWM signal to turn off power MOSFET under the control of Vea signal.

关 键 词：DC/DC变换器 斜坡补偿 LED驱动电路 

分 类 号：TN433[电子电信—微电子学与固体电子学]