针对半导体激光器(LD)的驱动特性 ,设计了一种基于开关电源的LD 驱动电路。利用电源控制芯片TL494实现了LD的恒流驱动和过压保护 ,通过对输出光功率的检测实现了光功率的自动补偿功能。实验表明，该驱动电路具有低纹波系数、高效率和光功率补偿功能，光功率输出稳定度优于0.5%，可满足LD实际工作的需要。

A laser Diode (LD) driver based on switching power is proposed according to the LD driver characteristics. The driver has the functions of constant current , over-voltage protected and optical power compensation by using the power manage IC TL494 and optical sensor. The experiment shows that the developed LD driver meets the characteristics of LD, furthermore it has isobaric output voltage, high efficiency and optical power compensation. The stability of optical output is lower than 0.5％.