Magnetically Compensated Multiple Chokes
DFKF
Series, flat housing
Nominal current:
Nominal inductance:
Rated voltage U
R
(U
max.
):
Frequency:
Test voltage:
Isolation voltage:
Climatic category:
Plastic case:
Potting resin:
0.4 - 6.3 A @
ϑ
a 40°C
0.6 - 40mH / tol. -30% +50%
440 VAC
50 - 400 Hz
1.8 kV/50 Hz/1min./wdg.-wdg.
2 kV eff. / wdg.-ambient
25/100/21 acc. to IEC 60068-1
UL 94 V-0
UL 94 V-0
All types of chokes correspond to the international specifications for
radio interference chokes (EN 138100).
This range of chokes enables horizontal mounting, thus reducing height of
the mounted circuit. Finest quality core materials allow the highest electrical
performance with minimum component volume. Good design with easy
assembly allows good cost/performance ratio.
This type of choke is essential in the field of power electronics, e.g. switching
power supplies, chopper amplifiers, DC drives and stepper motor controls.
DFKF
Magnetically compensated chokes are used for RFI sup-
pression in equipment with relatively high asymmetric
interference. Due to its current compensation characte-
ristic, this type of choke presents an active broad-band
series impedance.
Environmental rating:
Magnetically compensated chokes can only be
used when current is compensated. The current
flowing into the choke on one (•)-side must flow
100% out of the choke from the other (•) side
(see examples).Under different conditions the
choke will be saturated by the lowest current
and the attenuation efficiency lost.
SMD-version upon request.
R
cu
(3)
[mΩ]
Technical Data
Type
DFKF2-18-0.4-40/a
DFKF2-18-1.2-6.8/a
DFKF2-18-1.5-3.3/a
DFKF2-18-4.0-0.7/a
DFKF2-28-0.6-40/a
DFKF2-28-1.0-20/a
DFKF2-28-2.0-6.0/a
DFKF2-28-4.0-1.5/a
DFKF2-28-6.3-0.6/a
I
N
(1)
[A]
L
N
(2)
[mH]
[MHz]
∼
f
Res
P
loss
[W]
Case
04-2
04-2
04-2
04-2
15-2
15-2
15-2
15-2
15-2
0.4
1.2
1.5
4.0
0.6
1.0
2.0
4.0
6.3
2
2
2
2
2
2
2
2
2
x 40
x 6.8
x 3.3
x 0.7
x 40
x 20
x 6.0
x 1.5
x 0.6
2
2
2
2
2
2
2
2
2
x 1200
x 200
x 110
x
16
x 1000
x 360
x 100
x
28
x
13
0.11
0.45
1.2
2.5
0.2
0.28
0.3
1.3
2.5
0.4
0.6
0.5
0.5
0.7
0.7
0.8
0.9
1
(1)
@
ϑa
40°C; current derating over 40°C: I = I
N
x
(3)
Resistance @
ϑa
25°C
(100-ϑa)/60
(2)
Nominal inductance measured according to EN 138100, see introduction of this catalog, paragraph 3.4
Application
Application
Case 04-2
Case 15-2
24