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tps54231工作一段时间后,2脚vcc和8脚ph短路

Other Parts Discussed in Thread: TPS54231

使用tps54231做电源,输入24V,输出5V,按照WEBENCH Designer给出的原理图和器件参数实现电路。

带5V单片机作为负载,上电后工作正常,过了十几分钟后,2脚vcc和8脚ph会突然短路,输出电压变为24v,单片机被烧坏。

取下tps54231进行测量,发现2脚vcc和8脚ph短路,不可修复。

连续试了六片tps54231都是这种情况。