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LED照明如何实现亮度可调？LED是靠恒流驱动还是恒压驱动？
PWM调光，恒流驱动。
要想亮度控制得好, 就得考虑采用恒流驱动方式.
调节电流就可以控制亮度. 官网上有大量的手册和设计参考资料, 先去学习一下吧
1.流过LED电流决定LED亮度
2.可以近似认为LED亮度与流过的电流成正比
3.LED需要恒流驱动
