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求助,TPS54531没有输出

求助,我按照datasheet上的接法,pin=12.6v,pout输出上面一直测的是0,大概是什么原因,检查的方向是哪里?我已经换了几个54531芯片了。图上9号脚powerPAD也接地了,R71=51R,R73=10K,R75=2K。