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我是按照WEBENCH设计的tps54531电源芯片原理图,我想让其输入20-28V电压输出8V电压4A左右电流,为什么输出的电压正常是8V左右却没有带载能力呢?这是什么原因呢?还有就是芯片背面的power pad 如果不接地会有什么影响?