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TPS548D22: TPS548D22RVFR如何实现正负电压输出

Part Number: TPS548D22

麻烦问一下各位,电路对称设计的,正5V输出是可以的,但是负5V输出不对,是设计有什么问题吗?还是这个芯片内部电路逻辑有什么要求?