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关于LM27761输出电压的问题

Other Parts Discussed in Thread: LM27761

用得LM27761的推荐电路,想要输入3.3V,输出-2.5V,配置的电阻523K(用得24K和499K合的),499K..发现在空载状态下VFB的电压为1.5左右,Vout在-3V多点。加了负载之后才恢复正常到VFB  为1.2V,Vout为-2.4480V。

想知道这是为什么啊?datasheet里明明说的VFB在1.2V左右是个定值