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DC-DC降压恒流IC

Other Parts Discussed in Thread: LM25085A

寻找一个DC-DC降压恒流IC,应用如下:

直流电源适配器19V/4.7A输入.通过恒流IC驱动LED灯.   LED灯电压18V /3.7A

请问有哪种IC能满足这个要求?