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想设计一个数控LED调光系统,请教下大家!

Other Parts Discussed in Thread: UCC28810, LM3445

想做一个可以根据周围亮度自动调节LED亮度的系统,输入为市电变压后的24V,希望恒流输出,需要输出电流为1A~2A,PWM可调电流输出。请问该选择什么芯片?能否提供一些相关的典型应用电路?     谢谢大家!!!