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lm10011计算反馈电阻问题?

Other Parts Discussed in Thread: LM10011, LM21215A, TPS56121

设计C6678(0.9~1.1V, 200mv的变化范围)的CVDD供电方案,采用LM10011+DCDC芯片,输入电压12V,所以手册中LM21215A这个芯片不能用,看到官方推荐的TPS56121这个DCDC芯片,但是并没有看到评估板里面有这个芯片的参考设计。      按照LM10011里面的计算公式得出理论的RFB1(高侧)为 3.37K,RFB2(低侧)为4.05K,这个反馈电阻的理论值不在很多DC-DC芯片的推荐反馈电阻值范围中,若是这样,是不是限制了很多DCDC芯片的使用,还是有其他办法匹配DCDC推荐反馈电阻值呢?谢谢答疑