Ferrites and accessories
EELP 14, EILP 14
Core set (without clamp recess)
Series/Type:
Date:
B66281G, B66281K
November 2015
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EPCOS AG 2015. Reproduction, publication and dissemination of this publication, enclosures hereto and the
information contained therein without EPCOS’ prior express consent is prohibited.
EPCOS AG is a TDK Group Company.
ELP 14/3.5/5
Core (without clamp recess)
ELP 14/3.5/5 through ELP 64/10/50
Core set EELP 14
Combination: ELP 14/3.5/5 with ELP 14/3.5/5
■
To IEC 62317-9
■
Delivery mode: single units
B66281
ELP 14/3.5/5
Magnetic characteristics
(per set)
l/A = 1.45 mm
–1
l
e
= 20.7 mm
A
e
= 14.3 mm
2
A
min
= 13.9 mm
2
V
e
= 296 mm
3
Approx. weight
1.6 g/set
Ungapped
Material
N49
N92
N87
N95
N97
A
L
value
nH
800 25%
850 25%
1100 25%
1300 25%
1150 25%
e
P
V
W/set
< 0.08 ( 50 mT, 500 kHz, 100 °C)
< 0.22 (200 mT, 100 kHz, 100 °C)
< 0.20 (200 mT, 100 kHz, 100 °C)
< 0.20 (200 mT, 100 kHz, 25 °C)
< 0.18 (200 mT, 100 kHz, 100 °C)
< 0.16 (200 mT, 100 kHz, 100 °C)
Ordering code
(per piece)
B66281G0000X149
B66281G0000X192
B66281G0000X187
B66281G0000X195
B66281G0000X197
920
980
1270
1225
1320
Calculation factors
(for formulas, see
“E cores: general information”
)
EELP 14:
Material
Relationship between
air gap – A
L
value
K1 (25 °C)
N87
Validity range:
29.0
K2 (25 °C)
– 0.772
Calculation of saturation current
K3 (25 °C)
47
K4 (25 °C)
– 0.796
K3 (100 °C) K4 (100 °C)
39
– 0.873
K1, K2: 0.05 mm < s < 1.00 mm
K3, K4: 20 nH < A
L
< 200 nH
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
11/15
ELP 14/3.5/5 with I 14/1.5/5
Core (without clamp recess)
Core set EILP 14
Combination:
ELP 14/3.5/5 with I 14/1.5/5
■
To IEC 62317-9
■
Delivery mode: single units
B66281
ELP 14/3.5/5
I 14/1.5/5
Magnetic characteristics
(per set)
l/A = 1.15 mm
–1
l
e
= 16.7 mm
A
e
= 14.5 mm
2
A
min
= 13.9 mm
2
V
e
= 242 mm
3
Approx. weight
1.3 g/set
Ungapped
Material A
L
value
nH
N49
N92
N87
N97
850 25%
900 25%
e
P
V
W/set
Ordering code
(per piece)
780 < 0.06 ( 50 mT, 500 kHz, 100 °C) B66281G0000X149 (ELP core)
B66281K0000X149 (I core)*
820 < 0.18 (200 mT, 100 kHz, 100 °C) B66281G0000X192 (ELP core)
B66281K0000X192 (I core)*
1250 25% 1140 < 0.16 (200 mT, 100 kHz, 100 °C) B66281G0000X187 (ELP core)
B66281K0000X187 (I core)*
1300 25% 1190 < 0.13 (200 mT, 100 kHz, 100 °C) B66281G0000X197 (ELP core)
B66281K0000X197 (I core)*
* Plate-type tool type
Calculation factors
(for formulas, see
“E cores: general information”
)
EILP 14:
Material
Relationship between
air gap – A
L
value
K1 (25 °C)
N87
Validity range:
38.7
K2 (25 °C)
– 0.691
Calculation of saturation current
K3 (25 °C)
49
K4 (25 °C)
– 0.796
K3 (100 °C) K4 (100 °C)
40
– 0.873
K1, K2: 0.05 mm < s < 1.00 mm
K3, K4: 20 nH < A
L
< 200 nH
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
11/15
Ferrites and accessories
Cautions and warnings
Cautions and warnings
Mechanical stress and mounting
Ferrite cores have to meet mechanical requirements during assembling and for a growing number
of applications. Since ferrites are ceramic materials one has to be aware of the special behavior
under mechanical load.
As valid for any ceramic material, ferrite cores are brittle and sensitive to any shock, fast changing
or tensile load. Especially high cooling rates under ultrasonic cleaning and high static or cyclic loads
can cause cracks or failure of the ferrite cores.
For detailed information see chapter
“Definitions”,
section 8.1.
Effects of core combination on A
L
value
Stresses in the core affect not only the mechanical but also the magnetic properties. It is apparent
that the initial permeability is dependent on the stress state of the core. The higher the stresses are
in the core, the lower is the value for the initial permeability. Thus the embedding medium should
have the greatest possible elasticity.
For detailed information see chapter
“Definitions”,
section 8.2.
Heating up
Ferrites can run hot during operation at higher flux densities and higher frequencies.
NiZn-materials
The magnetic properties of NiZn-materials can change irreversible in high magnetic fields.
Processing notes
– The start of the winding process should be soft. Else the flanges may be destroyed.
– Too strong winding forces may blast the flanges or squeeze the tube that the cores can not be
mounted any more.
– Too long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrange-
ment.
– Not following the processing notes for soldering of the J-leg terminals may cause solderability
problems at the transformer because of pollution with Sn oxyd of the tin bath or burned insulation
of the wire. For detailed information see chapter
“Processing notes”,
section 8.2.
– The dimensions of the hole arrangement have fixed values and should be understood as
a recommendation for drilling the printed circuit board. For dimensioning the pins, the group
of holes can only be seen under certain conditions, as they fit into the given hole arrangement.
To avoid problems when mounting the transformer, the manufacturing tolerances for positioning
the customers’ drilling process must be considered by increasing the hole diameter.
Display of ordering codes for EPCOS products
The ordering code for one and the same product can be represented differently in data sheets,
data books, other publications and the website of EPCOS, or in order-related documents such as
shipping notes, order confirmations and product labels.
The varying representations of the
ordering codes are due to different processes employed and do not affect the
specifications of the respective products.
Detailed information can be found on the Internet
under www.epcos.com/orderingcodes.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
11/15
Ferrites and accessories
Symbols and terms
Symbols and terms
Symbol
A
A
e
A
L
A
L1
A
min
A
N
A
R
B
B
ˆ
B
ˆ
B
B
DC
B
R
B
S
C
0
CDF
DF
d
E
a
f
f
cutoff
f
max
f
min
f
r
f
Cu
g
H
ˆ
H
H
DC
H
c
h
h/
i
2
I
I
DC
ˆ
I
J
k
k
3
k
3c
L
Meaning
Cross section of coil
Effective magnetic cross section
Inductance factor; A
L
= L/N
2
Minimum inductance at defined high saturation (
Minimum core cross section
Winding cross section
Resistance factor; A
R
= R
Cu
/N
2
RMS value of magnetic flux density
Flux density deviation
Peak value of magnetic flux density
Peak value of flux density deviation
DC magnetic flux density
Remanent flux density
Saturation magnetization
Winding capacitance
Core distortion factor
Relative disaccommodation coefficient DF = d/
i
Disaccommodation coefficient
Activation energy
Frequency
Cut-off frequency
Upper frequency limit
Lower frequency limit
Resonance frequency
Copper filling factor
Air gap
RMS value of magnetic field strength
Peak value of magnetic field strength
DC field strength
Coercive field strength
Hysteresis coefficient of material
Relative hysteresis coefficient
RMS value of current
Direct current
Peak value of current
Polarization
Boltzmann constant
Third harmonic distortion
Circuit third harmonic distortion
Inductance
Unit
mm
2
mm
2
nH
nH
mm
2
mm
2
= 10
–6
Vs/m
2
, mT
Vs/m
2
, mT
Vs/m
2
, mT
Vs/m
2
, mT
Vs/m
2
, mT
Vs/m
2
, mT
Vs/m
2
, mT
F = As/V
mm
–4.5
a
)
J
s
–1
, Hz
s
–1
, Hz
s
–1
, Hz
s
–1
, Hz
s
–1
, Hz
mm
A/m
A/m
A/m
A/m
10
–6
cm/A
10
–6
cm/A
A
A
A
Vs/m
2
J/K
H = Vs/A
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
11/15
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