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关于TPS23880 待机功耗问题与高温过流保护点下降问题

Other Parts Discussed in Thread: TPS23880

在用TPS23880做正标90WPOE电源时,遇到不接PD情况下,IC发热严重,损耗在0.5W左右;  

在做高温试验时,常温可以输出1.67A电流,高温时只能输出1.5A左右,IC在不停重新检查---保护----检查;

请帮忙分析一下原因,谢谢