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1.voltage supply 希望5V或者3.3V
2.LED Driver 输出形式为PWM可调电压输出，输出电压范围0-6V最为理想
这种LED驱动芯片很多，PWM调制原理的LED驱动芯片还是调节亮度的优先选择方法。
符合上面条件很普通，芯片可选性很大，如果只是上述两个要求可以选用LM3404 LM3406 LM3407等型号的驱动芯片
