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使用TPS54160A出现问题

Other Parts Discussed in Thread: TPS54160A

使用TPS54160A,设计输入12-50V,输出5V,500ma的降压方案。进行实验时,不接负载。输入电压最高设定到32V,一开始能正常输出5.08V。而后过了一段时间,发现PH脚发黑,继而冒烟。请看看设计是否有问题?这个IC是否在空载时,有特别要求?