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tps65251发热过大问题

Other Parts Discussed in Thread: TPS65251

本人设计电路板,用tps65251为整个系统提供5V,3.3V,1.2V的工作电压,12V供电输入,在设计制板时,中间焊盘没有接地,调试过程中,在焊盘散热孔上飞线接地,然后通电发现5V和1.2V电压正常,3.3V电压测量是2.9V左右,3.3VFB反馈引脚电压是0.65V,片子发热量很大,过一会就过热保护,不工作了,我单独给三个电压供电,测得5V负载过电流0.1A,3.3V过负载电流0.5~0.7A,1.2V过负载电流0.4A左右,而另一块板子输出的电压都偏低,我想问下是什么原因造成的,有什么解决方案