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LM22670-ADJ使能EN脚利用外部UVLO控制电阻选择问题

根据文档,选择Renb(文档中推荐20K) 计算出Rent = 100K    Voff = 9.6V   Von = 13.6V  但是输入电压28V  还是没有输出电压   把这两个电阻去掉,将EN脚悬空  输出电压正常 ,怎么回事啊      这两个电阻阻值怎么确定啊   希望各位老大给介绍下啊    在线等!!!