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TPS53319: 求助,无电压输出

Part Number: TPS53319

如图,目前是完全空载的状态,VOUT就焊了个MLCC,输入有10V 0.077A

目前现象是 Vref有5V输出,en脚手动飞线拉到了5V,示波器测量LL没有任何波形,BST脚有5V没有任何波动,VOUT和FB都是0V

芯片换了两颗都是同样问题,实在排不出问题了