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TPS43060空载时MOS发热

Other Parts Discussed in Thread: TPS43060

使用TPS43060升压时,把所有的功率电阻电容都焊上去了,芯片没有发热了。但是空载时,两个mos发热。尤其是下桥mos,下桥mos的g极是有pwm信号的,但是上桥mos的g极信号和其s极是一样的杂波信号。另外,输入设定26v被拉低到4v,输入限定电流也达到限定值。请问这是什么原因?谢谢!!