From: hill@rowland.harvard.edu   
      
   John Larkin wrote...   
   >   
   > Winfield Hill wrote:   
   >> John Larkin wrote...   
   >>> Winfield Hill wrote:   
   >>>> John Larkin wrote...   
   >>>>>   
   >>>>> You can do fun switcher tricks with a dual inductor.   
   >>>>   
   >>>> Coupled inductor, John.  Coupled is the word to use.   
   >>>   
   >>> I ignore the Word Police.   
   >>   
   >> I have about 300 files in my computer concerning   
   >> coupled inductors, they're all the rage these days.   
   >> Most providers, and there are many, use the term   
   >> coupled inductor.  Your DRQ supplier, SRF and a   
   >> few others call them "dual winding."  TI and other   
   >> app note writers call them coupled inductors.  Both   
   >> Coilcraft and Coilmaster, who have piles of offerings,   
   >> call them coupled inductors.  Ditto Vishay and Wurth.   
   >> Published peer-reviewed papers say coupled inductors.   
   >>   
   >> If you want to search for them, coupled inductors is   
   >> the phrase.  Octopart comes up with about 1500 parts   
   >> that way, but only 184 searching for dual winding.   
   >> Of course, they're all the same bifilar wound stuff,   
   >> but that search term gets zero hits at Octopart. And   
   >> the O.P's title, bifilar inductor, gets only 5 hits.   
   >   
   > Digikey lists the DRQ series under category "Arrays,   
   > Signal Transformers" which is a bit strange.   
   >   
   > The Eaton data sheet calls them "Dual winding, high   
   > power density, shielded drum core power inductors"   
   >   
   > Bourns calls the SRF series "Dual-winding shielded   
   > power inductors"   
   >   
   > We stock them in the "transformers" category.   
      
    Hah, three sets off.  I know Eaton and Bourns are in   
    left field about this, even though I like the Bourns   
    offerings.  Eaton's series has lots of nice physical   
    sizes.  I've long avoided calling them transformers,   
    as transformers generally have cores without gaps,   
    and the magnetizing energy stored in the primary's   
    inductance is a pain, rather than part of the work   
    underway.  A complete contrast to coupled inductors,   
    where the energy stored in the inductance is a main   
    part of the idea, and the coupled winding grabs it   
    for the purpose at hand.   
      
      
   --   
    Thanks,   
       - Win   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)