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Subject:
Re: [TN] PCB onboard inductor dimensioning?
From:
Matthew Lamkin <[log in to unmask]>
Reply To:
DesignerCouncil E-Mail Forum.
Date:
Tue, 30 May 2000 11:36:58 +0100
Content-Type:
text/plain
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text/plain (169 lines) 
Thankyou Volkmar, 
Yes I saw your post & that there was no reply.
This subject & the one via current have not been answered.

We are looking into the equations that you gave & will try out some
sample boards
However I would like to look further into this, 
I.E.  What about the track width & spacing, copper on other layers,
using a PCB mounting core?

The formatting was lost, unfortunately you appear to be sending out in
HTML format, this not being readable
by all email readers gets rather garbled. Myself I use MS Outlook97 fed
through MS Exchange which does not like HTML.
So I had to cut & paste it into a text file, then change its extension
to HTM & view it through a browser.

Many thanks - Matthew Lamkin.

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><html>
>Hello Matthew,
><p>two weeks ago I had a similar question on this forum. So far I haven't
>received any answers. Therefore I consulted the literature and found the
>following formulae:
><p>1) a circular inductor with an outer diameter of D and an inner diameter
>of d will have an inductance of approximately :
><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n
>bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>0.492
><br>L [nH] =&nbsp;&nbsp; -----------------&nbsp; (D[mm]+d[mm])^2&nbsp;&nbsp;
>n^2
><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>2.25D[mm]-0.25d[mm]
><p>if you use a central via then d becomes 0.
><br>&nbsp;
><p>Elektronische Bauelemente, Michael Reisch, Springer-Verlag Berlin
>Heidelberg
>1998, p. 135
><br>&nbsp;
><p>2.) a circular inductor with an outer diameter of E[cm] and a radius
>of r[cm] will have an inductance of approximately;
><p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n
>bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>21.5 n^2 (E-r)
><br>L[nH]&nbsp; =&nbsp; -----------
><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>r
><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;
>1+2.72 -----
><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>(E-r)
><p>Das grosse Werkbuch Elektronik Bd2, Dieter Nuehrmann, Franzis' Verlag
>1998, p.1153
><p>Hope this helps, and the formatting isn't lost&nbsp; :-)
><p>&nbsp; Cheers
><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>Volkmar
><br>----------------------------------------------------------------
><p>Matthew Lamkin wrote:
><blockquote TYPE=CITE>HI all.
><br>I am trying to look into the dimensioning of an inductor as part of
>the
><br>PCB traces etc
><br>I cannot find any reference to how to do this on the net, has anyone
>any
><br>suggested URL's for where I might find this info?
><p>Many thanks -
><p>Matthew Lamkin
><br>Printed Circuitboard Draughtsman
><br>Protec Fire Detection PLC.</blockquote>
>
><li>
></li>
>
><li>
>Hello,</li>
>
><li>
></li>
>
><li>
>I need some help with the dimensioning of a printed inductance. The
>inductance
>I need is 1 uH, 60mA with a&nbsp; a low Q,</li>
>
><li>
>built with 0.2mm traces that have 0.2mm pitch. Is this common practice?
>Is there someone who can share their</li>
>
><li>
>experiences? Can anyone point me to resources available on the web?</li>
>
><li>
></li>
>
><li>
>A lot of questions for something, that can be bought in 0805 size.</li>
>
><li>
></li>
>
><li>
>Thank you</li>
>
><li>
></li>
>
><li>
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp
>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>Volkmar</li>
>
><li>
></li>
>
><pre>--&nbsp;
>&nbsp; Volkmar
>Hu&szlig;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n
>bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&
>nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dr&auml;ger
>ProTech GmbH&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>&nbsp; Engineering Electronic Circuit
>Boards&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>Elektronikbaugruppen&nbsp;
>&nbsp; Phone +49 451
>882-3998&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb
>sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>Moislinger Allee 53/55&nbsp;
>&nbsp;
>FAX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n
>bsp;&nbsp;&nbsp;
>-4365&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp
>;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs
>p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb
>sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 23542 L&uuml;beck /
>Germany&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>&nbsp; <A
>HREF="mailto:[log in to unmask]">mailto:[log in to unmask]</A>&nb
>sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
>
>------&nbsp;
>Engineer: (v.) to build something with bugs (software) or glitches
>(hardware).
>(n.) One who engineers.</pre>
>&nbsp;</html>
>

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