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TPS40057低温测试带载能力不足

Other Parts Discussed in Thread: TPS40057

Hi TI team:

     使用TPS40057设计应用,输入为DC24V,输出5V/10A,常温下测试正常,低温在-30℃时,带载能力下降,输出电压降低到1V左右。

做过如下测试:

1、先启动之后再接负载,一切正常;先接上负载再启动出现问题;

2、万用表测试接RT与地之间的电压时,工作恢复正常。

原理图如下,请帮忙查下: