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LM25117负载问题

input 20v-32v,output 19v;

input 23V以上负载正常,23V 以下随着负载电流增加,电压会降低;当input为 22v-23v 的时候,最高负载4A左右电流;

请问是什么原因呢?  电路是参考TI工具的,layout参考datesheet。

有劳各位大神了,需求帮助!