摘要
设计了一款基于通用IC LM5022的低成本汽车日行灯HB LED驱动电路,实现了HB LED的恒流驱动和PWM调光,并能满足日行灯的有关驱动要求。详细介绍了调光控制线路的设计,并对调光信号的时序和调光比影响因素等进行了分析,给出了主要实验参数和实验结果,输入电压6～19 V,输出电压40～57 V,PWM调光占空比可调5%～100%,输出LED电流200 mA,有关实验验证了本设计的可行性。
In this paper, a design of a low cost HB LED driver of DRL based on LM5022 is presented, with constant current drive and PWM dimming realized smoothly. Also, the requirements of DRL can be achieved. The design of the proposed PWM dimming control method is introduced in detail. And time sequence of dimming signals and the influence on dimming ratio are analyzed. The main parameters and experimental results are presented, with the input voltage 6-19V, the output voltage 40-57 V, the PWM dimming duty cycle adjustable 5%-100%, and the output LED current 200 mA. The proposed method is verified by the experimental results.
出处
《电子技术应用》
北大核心
2009年第2期78-82,共5页
Application of Electronic Technique
