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LM5001IDRQ!设计正负电源电路,负电压会随着负载(100mA左右)增大而降低

Other Parts Discussed in Thread: OPA2171

如下图原理图:

此电路现采用9V做输入电压(不用之前的12V),±13.5V给运放一个OPA2171供电(负载电流不超过100mA),实际5001输出电压是+13.88V和-12.88V。并且随着负载运放数量增多,负电压幅值还会继续降低。请教一下此电路中元器件参数如何做修改才能保证负电压稳定在-13.8V这样。或者电路上需要做什么调整?