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Design of Planar
Power Transformers
Contents
Introduction 3
Design procedure 4
Design examples
-flyback 8
-forward 10
Formulas 13
Layer design 14
1
Ferroxcube
Exploded view of a planar transformer
2
Ferroxcube
Introduction
Planar transformers can be constructed as stand alone
components, with a stacked layer design or a small
multilayer PCB, or integrated into a multilayer board of the
1/2 planar E core
power supply.
Important advantages of planar magnetics are: layer 1
- very low profile
- excellent thermal characteristics. layer 2
- low leakage inductance
- excellent repeat ability of properties multilayer PCB layer 3
Measurements on planar E core transformers under layer 4
operating conditions with windings in multilayer PCBs
show that the thermal resistance is substantially lower
(up to 50 %) compared to conventional wire wound
transformers with the same effective core volume V . 1/2 planar E Core
e
This is caused by the improved surface to volume ratio. stand alone transformer
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