Texas Instruments 600W Isolated PFC AVR Power Supply Evaluation Module UCC25600EVM-644 UCC25600EVM-644 Datenbogen
Produktcode
UCC25600EVM-644
Design Considerations
5.2.2
Transformer and Resonant Inductor Design
For this design, the leakage in the transformer is utilized as the resonant inductor. An external inductor,
can be used, but at a higher cost.
can be used, but at a higher cost.
The leakage inductor in the transformer is created by un-coupled flux between the primary and secondary
side. The user does not have to consider saturation of the inductor since it is to be regarded as an air coil.
side. The user does not have to consider saturation of the inductor since it is to be regarded as an air coil.
It is possible to use chamber bobbins, but to avoid being tied to specific coil former; the transformer is
utilized on a standard ETD39 bobbin. The principle is to create space between the primary and secondary
windings. The larger the distance, the larger the leakage inductance. The transformer is constructed with a
tapped secondary side and these two windings are physically laid side-by-side across the bobbin window,
which also adds to leakage.
utilized on a standard ETD39 bobbin. The principle is to create space between the primary and secondary
windings. The larger the distance, the larger the leakage inductance. The transformer is constructed with a
tapped secondary side and these two windings are physically laid side-by-side across the bobbin window,
which also adds to leakage.
Figure 4. Transformer Construction
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A 600-W, Isolated PFC Power Supply for AVR Amplifiers Based on the
SLOU293C – June 2010 – Revised September 2012
TAS5630 and TAS5631
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