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LM3481升不了压

Other Parts Discussed in Thread: LM3481

我用LM3481做锂电池的放电升压电源芯片,在调试的时候发现升不了压。
Isen管脚电压为0.9mv;UVLO为3.98V;COMP位2.66V,FB为0.72V;AGND为0V;FA/SYNC/SD为0.762;DR位0.3mv;VCC为0.3MV
求问是什么原因造成的呢?