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LM25118做buck-boost电源

Other Parts Discussed in Thread: LM25118, LM5118

我用LM25118做buck-boost电路,电路按照datasheet上画的。实现18~36V输入,24V输出。问题:当18~22V输入时,输出电压只有13V左右(此时空载),继续加电压,会达到24V输出,此时工作正常,即使在把电压调回到18~22V,输出也是24V,请帮我分析下这是什么原因造成的?