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LM3421和TPS92691 Boost恒流输出问题

Other Parts Discussed in Thread: TPS92691, LM3421

使用LM3421和TPS92691做Boost恒流输出源时,输入6-18V,输出1.72A,Vop为32V,为什么当输入电压低于7V左右时,输出的电流与设置的电流不一样(小于 设定电流),输入高于7V时,电流正常。