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LED恒流源

Other Parts Discussed in Thread: LM3404, LM3409, TPS40211, LM3421

需同时点亮8颗LED(每颗LED的波长是不同的),电流为350mA,产品说明上写每颗LED电压大概是3.5——3.8V,请问我应该选用哪种恒流芯片,这些LED串联好还是并联好呢?十分感谢