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TPS56221输出电压不正常

Other Parts Discussed in Thread: TPS56221

如题,按照datasheet搭建电路,按照设计,TPS56221输出电压为1.0V,但是实际输出为0.52V

输入电压5V,VDD=5V

经测试,pin2 V(fb)=0.32V,与datasheet描述不符V(fb)=0.6V

经测试,V(bp)=5V,与datasheet描述不符V(bp)=6.5V

使能端pin21由NMOSFET控制,悬空后,测得pin21电压为4.01V

请大侠指点,多谢!