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我根据ti提供的方案做的12V转5V 20A开关电源,电流远远达不到20A

我用电子负载议测试的,在恒压模式下,5V电压,只能输出大约4A;在恒流模式下,当电流为8A时,输出电压就降到4.6V,电流大于9A时,电源进入保护状态,输出1.2V,请问这有可能是什么问题导致的?以下是我的pcb文件

12-5 (1).zip