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TPS51116电源使用问题:DRVH引脚电压始终为0?

Other Parts Discussed in Thread: TPS51116

在使用TPS51116芯片,按照参考原理图进行设计,最后调试时发现LL引脚始终无输出,S3、S5直接接+3.3V电平,测试发现DRVH引脚电压始终为0V,不知道与PGND的PCB布局有无关系?不知道什么原因,一直都没有输出,芯片也不发热?