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REF5050: 输出电压一直是1.93V

Part Number: REF5050
Other Parts Discussed in Thread: DAC8554

原理图如下:

重新焊接、换芯片均无效;又以为是压降不够,但图中+5.2V调整到5.37V后,输出还是1.93V,仔细看过手册后也未能发现是何原因,负载是DAC8554IPWR芯片。

请帮我解答下,谢谢!