Embed Your Planar Magnetics To Maximize DC-DC Converter Performance (Part 3): The Bias Supply

Focus:

Part 3 of this article series continues the discussion on embedded planar magnetics and how its use enhances the performance of a digitally controlled dc-dc converter design. The focus here is on design issues faced when implementing a bias supply (This includes the 3.3-V auxiliary supply needed to power the dsPIC33F GS series digital controller and 12-V supplies for the dc-dc converter's gate drivers.) A flyback design using analog control is chosen for the bias supply and the author works through the design of the bias supply transformer TX3. For the implementation, this article considers the use of a conventional wound transformer and contrasts its dimensions with that of an embedded planar implementation, which is ultimately selected for TX3 because it meets the overall height requirement for the dc-dc converter. The embedded planar implementation of TX3 is described in detail.

What you’ll learn:

• How to design an embedded planar transformer for use in low-power (approx. 7 W) flyback converter

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Author & Publication:

Harold Eicher, Champs Technologies, East Setauket, NY, How2Power Today, Dec 16 2010

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