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LM27762: 关于分压电阻阻值选取

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Prodigy 10 points
Part Number: LM27762

在数据手册中有提出分压电阻在FB和GND间的部分应不小于50K，我想知道这个限制是出于稳定性还是出于满足标称效率，如果是为了满足标称效率，那么实际上这个电阻应该没有最小值的限制？

目前有在使用的电路，FB与GND间的电阻为470Ω，能够正常工作，对效率及静态功耗不敏感，目前打算基于这个设计将输出电压修改为±1.6V用于其他电路