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降压芯片 正负输入 正负输出的问题

Other Parts Discussed in Thread: TPS54160, TPS54560

需要±15V转±5V,1A,使用开关电源,可以使用2片降压芯片这么搭建电路么? 

不想使用slva369a.pdf的方式,这样做负载调整率不好。

按下图做可以么,DCDC使用TPS54560