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TPS40210带负载无法升压

Other Parts Discussed in Thread: TPS40210, LM5050-1

用TPS40210将9V升压到12V给电池充电,在空载和或电池较满时(电池12V)时能升压到12.5V,但是但电池为10V或11V时,就不能升压,GDRV没有输出,SS脚一直在跌落、升起,始终无法到5V以上,RC脚有正常600k的三角波,FB为622mv,ISNS脚3.5 mv,BP脚8.19V,COMP为0.6mv,请问这是怎么回事,电路如下