Ferrites and accessories
ER 26/6/15 with I 25/3/15
Planar core set
Series/Type:
Date:
B66484G, B66484P
June 2013
Data Sheet
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.
ER 25/6/15
Planar core
Core set EER 25
Combination: ER 25/6/15 with ER 25/6/15
■
■
■
■
■
■
B66484
ER 25/6/15
To IEC 62317-9
Optimized winding area
Small overall footprint (core and winding)
Less EMI
Minimized winding length
Delivery mode: single units
Magnetic characteristics
(per set)
l/A
l
e
A
e
A
min
V
e
= 0.482 mm
–1
= 34.1 mm
= 70.8 mm
2
= 69.4 mm
2
= 2414 mm
3
Approx. weight:
14.2 g/set
Ungapped
Material
N49
N92
N87
N97
A
L
value
nH
3000
25%
3000
25%
4100
25%
4100
25%
e
1150
1150
1570
1570
P
V
W/set
< 0.34 ( 50 mT, 500 kHz, 100 °C)
< 1.40 (200 mT, 100 kHz, 100 °C)
< 1.27 (200 mT, 100 kHz, 100 °C)
< 1.01 (200 mT, 100 kHz, 100 °C)
Ordering code
B66484G0000X149
B66484G0000X192
B66484G0000X187
B66484G0000X197
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
06/13
ER 25/6/15 with I 25/3/15
Planar core
Core set EIR 25
Combination:
ER 25/6/15 with I 25/3/15
■
To IEC 62317-9
■
Optimized winding area
■
Small overall footprint
B66484
ER 25/6/15
I 25/3/15
(core and winding)
■
Less EMI
■
Minimized winding length
■
Delivery mode: single units
Magnetic characteristics
(per set)
l/A
l
e
A
e
A
min
V
e
= 0.399 mm
–1
= 28.1 mm
= 70.4 mm
2
= 69.4 mm
2
= 1978 mm
3
Approx. weight:
11.5 g/set
Ungapped
Material A
L
value
nH
N49
N92
N87
N97
e
P
V
W/set
Ordering code
3400
25%
1080 < 0.30 ( 50 mT, 500 kHz, 100 °C) B66484G0000X149 (ER core)
B66484K0000X149 (I core)
3400
25%
1080 < 1.14 (200 mT, 100 kHz, 100 °C) B66484G0000X192 (ER core)
B66484K0000X192 (I core)
4600
25%
1460 < 1.04 (200 mT, 100 kHz, 100 °C) B66484G0000X187 (ER core)
B66484K0000X187 (I core)
4600
25%
1460 < 0.83 (200 mT, 100 kHz, 100 °C) B66484G0000X197 (ER core)
B66484K0000X197 (I core)
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
06/13
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 destroid.
– To strong winding forces may blast the flanges or squeeze the tube that the cores can no more
be mount.
– To long soldering time at high temperature (>300 °C) may effect coplanarity or pin arrangement.
– 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.
4
06/13
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 (
a
)
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
5
06/13
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
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
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