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TPS3840: 电源监控芯片,监控端分压网络下,电压比例不符合理论计算

Part Number: TPS3840

最近使用TPS3840DL45用来监控12V电压,VDD引脚使用分压网络,12V>Rtop_47K>Rbot_36.5K,当测试掉电波形时,发现12V网络,和VDD电压不满足电阻分压网络关系,电路图如附件,测试波形分别为P12V,shutdown,VDD。我们可以看到当VDD为4.3V时,shutdown拉低,但是此时P12V已经到了7.67V,我们理论值应该是9.83V,分压网络电阻阻值确认没有问题。