Transformer between Ethernet PHY and RJ45 connector will block line to ground surge?

Status
Not open for further replies.
E

Elson Ong Cheng Ching

Newbie level 1
Joined
Jan 5, 2015
Messages
1
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
9
I am not quite understand this sentence.

"Transformer can block line to ground surge discharge energy. If the line to ground surge energy couple into chip side, then capacitor and chip side TVS would discharge energy to ground."

In my understanding, we need TVS in between RJ45 and transformer because transformer simply has blocked the feature of surge discharging to ground. Does transformer really block surge discharging?

Appreciate if anyone here could help out to clear my confusion. Thanks a lot.
 

Unclear problem specifications bears unclear answers, I fear.

I agree that the "If ..." sentence doesn't make much sense. The transformer can be expected to block common mode surges but will pass differential mode surge, if occuring at all. The transformer capacitance passes a certain amount of fast surges, e.g. ESD events to the secondary, so clamp diodes might be still meaningful.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…