Re: Flyback converter - winding order

From: Terry Given (my_name_at_ieee.org)
Date: 02/01/05 

Date: Wed, 02 Feb 2005 09:33:32 +1300

legg wrote:
> On Tue, 1 Feb 2005 14:38:44 +0000 (UTC), kensmith@green.rahul.net (Ken
> Smith) wrote:
>
>
>>In article <2qutv05bm1agc9hvftppauo8kcs8eibr58@4ax.com>,
>>legg <legg@nospam.magma.ca> wrote:
>>[....]
>>
>>>Please be reminded that the OP is discussing a 2W flyback converter
>>>with a 12V primary.
>>
>>Are you trying to imply that overkill is a bad thing?
>>
>
> When we vary from the specific, the likelihood of wasting time is
> increased. His inquiry was pretty specific.
>
> Designing for ruggedness can make sense. Overkill is just overkill.
>
> RL
>

And although its only a 2W smps, if he dumps all the leakage into a
SOT23 "zener" it could still get pretty hot (it doesnt take many watts
at 300K/W), so reducing leakage by interleaving is probably warranted.

Unless I have a requirement for poor coupling I always interleave
windings. Once you learn how to do an MMF plot the interleaving becomes
self-evident. Winding asymmetries are easy to compensate for too.

Cheers
Terry

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