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LM5116 短路电感电流剧增,为什么

Other Parts Discussed in Thread: LM5116

采用LM5116,输入45V,输出30V/4A,电路图同技术手册。缓慢加载过流保护在Ipeak=6.2A动作,做输出短路电感电流剧增,波形如下,芯片是cycle by cycle限制电感电流,为什么会出现剧增17A保护?

黄色:输出电压  绿色:UVLO   红色:电感电流