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这个升压芯片和降压芯片、升降压芯片有什么本质区别吗?

Other Parts Discussed in Thread: LM2587, LM2596

就比如lm2587和lm2596,难道就是因为lm2596的开关管没有接地而lm2587的开关管接地了?而且lm2587也可以用于sepic升降压电路啊,把lm2596的开关管接地不也能组成boost升压电路吗?求指导!