[SI-LIST] Re: Regarding: Usage of Magnetics...
- From: DrFWS@xxxxxxx
- To: weirsi@xxxxxxxxxx, karthick.murugan@xxxxxxxxxxxxxxxxxx
- Date: Wed, 30 Dec 2009 15:45:08 EST
Steve - Don't you mean McLyman?
Transformer and Inductor Design Handbook - Col. William T. McLyman
McLyman was at JPL for some 30 years - now president of Kg Magnetics, Inc.
Has five books listed on his website.
_http://www.kgmagnetics.com_ (http://www.kgmagnetics.com)
Regards - Bill
Dr. F. Williams Sarles
Consulting Engineer
FWS ENGINEERING
54 Ledgelawn Avenue
Lexington MA 02420-3449
Tel: 781-862-0607
Fax: 781-861-7518
Email: DrFWS@xxxxxxx
FWSarles@xxxxxxxxxxxx
In a message dated 12/30/2009 6:48:00 A.M. Eastern Standard Time,
weirsi@xxxxxxxxxx writes:
There are entire books written on magnetics design. The oldest well
known volume is probably Lyman.
Steve.
karthick.murugan wrote:
> what are the parameters desires these functionalities,
> how can we focus on the individual functionality improvement,
> for example if I need to improve the galvanic isolation alone what are
the
> changes we could do with that.
> Is it any possible way there to be isolated improvement of these
> functionalities.
>
> Karthick.M
>
> ----- Original Message -----
> From: "steve weir" <weirsi@xxxxxxxxxx>
> To: "karthick.murugan" <karthick.murugan@xxxxxxxxxxxxxxxxxx>
> Cc: <si-list@xxxxxxxxxxxxx>
> Sent: Saturday, December 26, 2009 9:42 PM
> Subject: Re: [SI-LIST] Regarding: Usage of Magnetics...
>
>
>
>> Ethernet magnetics serve five functions:
>>
>> Galvanic isolation
>> Common mode suppression
>> Level matching
>> Transient energy transfer limiting
>> Power feed ( PoE only )
>>
>> If you do not need one or more of those functions, then you may find
you
>> meet your needs with simpler magnetics or no magnetics at all. You can
>> for example obtain galvanic isolation and level matching with one
properly
>> chosen transformer. You will have to do homework with the chips you
are
>> using now and anticipate what you might use in the future to determine
>> what the minimum is that you can get away with.
>>
>> Steve.
>>
>> karthick.murugan wrote:
>>
>>> Hi All,
>>> I just need to clarify a small doubt on the usage of magnetics,
>>> Whenever we are using Ethernet switch IC we should provide the
magnetics
>>> to the ports at the chip side.
>>> Due to some reason like signal balancing, common-mode rejection,
>>> impedance matching, and EMC improvement.
>>> Consider, I am using one processor board and the respective rear board,
>>> In that the magnetics outputs (twisted pair) are coming from the
>>> processor board, and it could be connected with the Ethernet switch IC
>>> that one I used in rear board through the rear connectors,
>>> In Ethernet switch datasheet they mentioned all the ports should
connect
>>> with primary side of the magnetics.
>>> My doubt is whether we could provide one more magnetics (because
already
>>> magnetics was given in processor board, that output is coming from the
>>> processor board to rear board side) to the ports of Ethernet switch
IC,
>>> then connect to the processor side magnectics output, or there is no
need
>>> of magnetics, if the magnetics is not need for that case tell me
reason.
>>>
>>> Best Regards,
>>> Karthick.M
>>>
>>>
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Regards - Bill
Dr. F. Williams Sarles
Consulting Engineer
FWS ENGINEERING
54 Ledgelawn Avenue
Lexington MA 02420-3449
Tel: 781-862-0607
Fax: 781-861-7518
Email: DrFWS@xxxxxxx
FWSarles@xxxxxxxxxxxx
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