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TPS548B28: 根据手册原理图设计的该芯片功能,实际调试中发现输出电压为0.3V,PG信号为低电平!请问该如何分析问题在哪里?

Part Number: TPS548B28

根据手册原理图设计的该芯片功能,实际调试中发现输出电压为0.3V,PG信号为低电平!输入12V电压,使能4V,VCC电压接的内部3V,BOOT电压2.5V,SW端电压一直试0.3V不变,请问该如何分析问题在哪里?