TLK106RHBR Line Current

Eric Dahl

Hello!

What is the current on the TD+ and TD- lines of the TLK106RHBR? I’m asking because I want to make sure that I provide for enough bias current to the Ethernet transformer without going overboard.

Thanks!

Eric

over 11 years ago

0 Ross Pimentel over 11 years ago

TI__Mastermind 23675 points

Hi Eric,

Here is an applications document detailing how to implement our TLK devices. Section 8 gives you information on recommended magnetics.
http://www.ti.com/lit/an/slva531a/slva531a.pdf

Regards,
Ross

0 Eric Dahl over 11 years ago in reply to Ross Pimentel

TI__Intellectual 1310 points

Hey Ross,

Thanks for the really quick reply! I didn't see an email for this so I didn't check it until now.

Could you please clarify for me how section 8 answers the question about current on the TD+ and TD- lines? I am not quite sure I understand.

Appreciate it.

Eric

0 Ross Pimentel over 11 years ago in reply to Eric Dahl

TI__Mastermind 23675 points

Hi Eric,

Sorry if that was not very clear. Here is a break down:

10Mbps largest voltage swing 2.8V (2.5V typical), but lets cover worst case.

Use 50 Ohm termination

2.8V/50ohms = 0.056A

I would suggest that you allow for some more headroom on the transformer connection.

Hopefully this helps!

Regards,

Ross

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TLK106RHBR Line Current