I'm looking into doing a Bob Smith termination for a Power over Ethernet (POE) PSE. The TI app note shows the following termination:
But all of TI's reference designs (and later figures in the same document) use the following termination with two ESD capacitor:
Are these circuits equivalent? What is the purpose of having two ESD capacitors?
Best Answer
I found the following examples of POE termination from around the internet:
After posting the same question on TI's E2E forum, I got the following answer:
So, the second ESD 1nF capacitor is superfluous and I think diminishes the effects of the Bob Smith termination.