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求一款LED恒流源芯片!

Other Parts Discussed in Thread: TPS92691

LED是7串6并的,每颗灯的标称电压大概3.2左右,总电流要求≥1.5A,输入电压是20-24V不定(随外界线缆增长变化)

现在我这边有两种方案:

1、是将输入电压进入DC/DC变成高电压,输入BUCK恒流源

2、直接用BUCK-BOOST恒流源

大佬们看一下这两个方案哪一种比较好,而且有没有相关的芯片推荐一下!谢谢!