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LM2776: 输出电压偏差

Part Number: LM2776

我想用LM2776实现5V到-5V的电压转换,我通过webench设计了该电路,电流假定为最大100mA,原理图和pcb如下图所示。我通过电压源给了5V的输入,万用表测试输入电容=4.995VCFLY=4.990V,输出电容-4.880V,我想知道是我的设计存在问题还是芯片的精度导致偏差?