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TPS53313 BP7无输出

Other Parts Discussed in Thread: TPS53313

我现在用TPS53313搭建1个12V输入1V输出的电路,原理图基本参考的手册参考设计,现在测试发现无数出,SW/VBST脚均无输出,EN已经通过VIN上拉,发现BP3输出正常3.5V,BP7输出0,当en拉低时,bp3停止输出,但bp7依然保持无数出状态,通过框图,我推测BP7是控制核心运行的电源,但是现在该LDO始终输出为0,有什么方法使BP7输出正常,另外已经更换过片子,应该不是焊接问题,测量BP3/BP7反向二极管电压 均为0.5V