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关于ADS8528的DVDD问题

Other Parts Discussed in Thread: ADS8528

整个板子供电5V,一路接AVDD,另一路经LDO芯片转为3.3V,连到25脚的DVDD,此时稳压电源显示电流有600mA,而程序还没运行,就是ADS8528还没工作,摸一下ADS8528非常烫手,去掉3.3V的LDO,再上电,DVDD竟然有4.1V的输出。然后将稳压电源另一路调到5V,直接接到DVDD,稳压电源输出电流显示为0,稳压电源另一路的5V输出电流10mA,正常。然后下降连DVDD的5V供电,到4.1V时,再怎么下降电源电压,稳压电源都显示输出电压为4.1V。请问一下,为什么会出现这样的情况?DVDD怎么会有4.1V的输出呢?谢谢啦