恒定电流源可以避免因输入电压的波动使LED的驱动电流波动并维持LED的亮度不变。
Constant current source can avoid the fluctuations of output current due to the fluctuations of input voltage, and maintain the brightness of LED.
设计了一种可程控功率源，其特点是可输出大功率的恒定电流和恒定电压，波形参数和输出变化方式可由程序控制输出；
The system is so designed and then the key ICs are choose carefully. A controllable power source is designed in this paper.
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