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【紧急求助】LMZ31710芯片实现16-5V电压转换,空载输出正常,接负载输出变成3.3V,请大神指点!!!!!

Other Parts Discussed in Thread: LMZ31710

设计如上图,使用的LMZ31710芯片实现16V-5V。空载的时候,输出电压正常,但是接上负载(电流大约3A左右),输出电压莫名奇妙的降低到了3.3V。是不是设计存在什么问题?如上图PWRGD、SYNC、SS/TR等都是悬空的设计。请大神指点!!!!!!!!!!!!

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