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TPS61175: 接负载后输出电压降低

Part Number: TPS61175

查看规格书画了上面这样的一个电路,按照数据手册的公式计算此时电压输出应为13.5V,但接上负载之后电压降到了13V,

下面为PCB布局,12V输入线线宽为40mil,给芯片供电线为15mil

请问一下,这样的情况可能是什么原因导致的电压降低?