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TPS65131负电压 输出不对

空载下:升压+15V输出正常,还想要一个-5V的电压出输出。负压一直是-2.9V左右 , 调节电阻去掉也是一样的-2.9V输出。不知道哪里出的问题? 帮忙看一下 ,谢谢!