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TPS40170无输出



板子有3.3和8V输出,FB无电压,EN3V,RT1.6V,COMP0.2V,SS0.7V,BOOT7.4V;想15V输出,但是板子没有反应,不知道为什么?参数都是按照手册上的公式配置的,请问一下这是什么原因呢?