This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TAS6424E-Q1: DC诊断,开路阻值一直跳动,读不到open load(OL)出错信息

Part Number: TAS6424E-Q1

Hi TI-expert,

       在车机开机状态下,断开喇叭,tas6424的DC诊断寄存器没有读到OL开路的错误信息,0xc和0xd寄存器,对应OL的标志位没有被置1.此时量取功放输出端的电阻,阻值从0-30Ω变化跳动。按照spec说明,OL错误是电阻大于40欧姆,才会判别为OL开路错误。

     但是如果车机关机状态下,断开喇叭,再上电开机,这时0xc和0xd寄存器能读到开路错误信息,此时功放输出端的电阻值是个无穷大的值。

      请问为什么开机状态下,开路时候电阻值这么小?