Document 128-1
SwitchmodeTransformerFerriteECorePackages
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Cost effective designs
Use of standardized components speeds delivery
VDE, IEC, UL, CSA compatible
Maximized winding area
Frequency range: 10-250 kHz and higher
Power range: 1-1,000 Watts
UL approved Class 130°C insulation system
available (UL File E83628)
Coilcraft offers a complete standard line of switching
power transformer packages. Their reliable, cost effec-
tive magnetics design has been achieved using stan-
dard ferrite E cores and Coilcraft’s own bobbin designs.
These transformer assemblies can be used for up to
1000 Watts output power over a wide frequency range.
They’re applicable in all types of switching power supply
circuits including forward converter, flyback, and bridge
types.
VDE, IEC, UL, and CSA safety specifications were a
major consideration in the development of these trans-
former materials. The bobbins and cores have been de-
veloped to achieve straightforward designs that meet
the full intent of all major international safety codes.
Also available in powdered iron
Powered iron E cores are now available for all Coilcraft
standard E core packages except the PT 7019. This has
extended the versatility of these packages, making them
an ideal choice for power inductors as well as switching
power transformers.
Powdered iron cores are available in industry-wide
standard materials ranging from 25 to 75 µ. The high
saturation levels of powdered iron combine with the
economy of the E core shape to provide inductors that
have larger energy storage capacity and are straightfor-
ward to design.
For additional specifications and design information
contact your Coilcraft representative.
100W
170W
250W
500W
750W
1000W
Specifications subject to change without notice. Document 128-1 Revised 2/21/97
Document 128-2
The following tables and charts should be used in conjunction with Coilcraft’s application note “Structured
Design of Switching Power Magnetics”, Document 129.
PT3595
Power capacity @ 100 kHz*
a
e
(eff. cross sectional area)
l
e
(mean mag. path length)
a
w
(bobbin winding area)
Required board space
Typical max. height
Average length per turn
100 W
.89
.95
cm
2
cm
2
7.30 cm
1.47″ x 1.30″
1.17″
2.9″
PT4113
170 W
1.61
1.24
cm
2
cm
2
8.27 cm
1.75″ x 1.45″
1.30″
3.4″
PT4215
250 W
1.84
1.95
cm
2
cm
2
10.32 cm
1.83″ x 2.10″
1.72″
3.7″
PT4220
500 W
2.40
1.95
cm
2
cm
2
10.32 cm
1.83″ x 2.10″
1.82″
3.9″
PT5521
750 W
3.46
3.23
cm
2
cm
2
13.08 cm
2.05″ x 2.35″
2.05″
4.4″
PT7019
1,000 W
3.25 cm
2
16.97 cm
6.39 cm
2
2.50″ x 2.95″
2.45″
4.8″
NOTE:
All bobbins are rated UL 94V-0, 130° C minimum.
*Typically power capacity increases linearly with frequency, and may vary depending on the specific converter configuration used.
Figure 1
(E – T) x 10
8
NOTE: Chart based on
NP
=
B x A
E
(For further reference, see Coilcraft’s application note “Structured
Design of Switching Power Magnetics,” Document 129.)
Specifications subject to change without notice. Document 128-2 Revised 2/21/97