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TPS54360B: 制作正负压电源,在两侧负载不均衡时出现电压偏移

Part Number: TPS54360B

如标题,使用TPS54360B制作分轨电源,在正负压同时空载的时候,调节电位器(我将R2改为了电位器)使得正负输出电压绝对值约为5V,然后在正电压输出端加上约1A的负载(LED灯),然后再次测量电压,正电压输出端电压降到3.5v左右,负电压绝对值升值约6.5V。请问这是正常现象吗

原理图如下,我删掉了EN线路的R6,R7,输入电压19V