EVL6563S-200ZRC STMicroelectronics, EVL6563S-200ZRC Datasheet - Page 35

• Manufacturer Part Number: EVL6563S-200ZRC
• Description: Power Management Modules & Development Tools Tranisition Mode PFC L6563S EVL Board
• Manufacturer: STMicroelectronics
• Type: Motor / Motion Controllers & Driversr

Specifications of EVL6563S-200ZRC

• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN3180
Electrical equivalent circuit models of coupled inductors and transformers
is associated to the magnetic flux that flows mostly through the magnetic core and so, is
affected by the non-linearity typical of magnetic materials. If the flux density exceeds the
saturation level, the permeability of the magnetic material µ drops dramatically almost to the
free space value µ0; as a result L
tends to be a much lower value and shunts the ideal
M
transformer, so that, essentially, only L
and L
are visible from the terminals. Moreover, the
l1
l2
windings are nearly decoupled and energy transfer is extremely low.
Finally, although transformers and coupled inductors work in a substantially different way
(coupled inductors store energy, transformers ideally do not; in coupled inductors the
magnetizing current - i ( t ) in
Figure 24
- is directly related to the winding currents i
( t ) and
1
i
( t ), in transformers it is related to the winding voltages v
( t ) and v
( t ) and to time, and this
2
1
2
difference reflects also in the core saturation mechanism), they may be described by the
same equivalent circuits. Therefore, the basic model of
Figure 24
and its derivatives of
Figure 25
to
Figure 29
can be indifferently considered as both coupled inductor models and
transformer models.
Doc ID 17273 Rev 1
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