前期样板测试时是正常的,最近小批量投板后,发现有部分板子,大约有1/3左右,这部分电路的输出有问题,空载时,输出电压在2.6-3.1V之间变化,另外2/3的板子空载可以正常输出3.6V。有问题的板子,将输入电压提高到5.4V以上输出正常,或者更换54331后也可恢复正常。板子SMT之后经过外观和X光检测,TPS54331是从正规代理处拿的货,请问是什么原因,如何解决。
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