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TPS54060双轨输出异常,正负电压差别大

Other Parts Discussed in Thread: TPS54060

使用TPS54060双轨输出,24V直流输入,±18.5V左右输出,但是输出正电压23V左右,负电压14V左右,都带上1.5K电阻的负载时基本没变化。求问可能是什么原因,参数都是按照手册SLVA369 来计算的,附上原理图和PCB,不知道是不是分压电阻R5和R6离7号管脚太远了?才看到这个电路的layout 说分压电阻也要离IC近