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LM5176: HDRV1输出异常

Part Number: LM5176

用LM5176控制四管升降压电路,输入为7V和16V时(期望输出为12V),HDRV1始终为低电平(有微弱的抖动),LDRV1有方波,HDRV2为高电平。

BOOT1为接近VCC的电压值,但是SW1始终为0V。

请问是什么原因造成HDRV1输出异常的呢?