我使用的一款电源芯片TPS62160，输入电压为12V，设定配置电阻输出电压为3.3V，但是在反复上电过程中发现有时候输出电压会变成4.8V或者六点几伏，重新上电后又能恢复，请帮忙看一下是什么原因造成此现象。
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