Ferrites and accessories
E 65/32/27
Core and accessories
Series/Type:
Date:
B66387, B66388
June 2013
Data Sheet
EPCOS AG 2013. Reproduction, publication and dissemination of this data sheet and the
information contained therein without EPCOS’ prior express consent is prohibited.
E 65/32/27
Core
■
Delivery mode: single units
B66387
Magnetic characteristics
(per set)
l/A
l
e
A
e
A
min
V
e
= 0.27 mm
–1
= 147 mm
= 535 mm
2
= 529 mm
2
= 78650 mm
3
Approx. weight
394 g/set
Ungapped
Mate- A
L
value
rial
nH
N27
N87
7200 +30/–20%
7900 +30/–20%
e
B
S
*
mT
P
V
W/set
< 14.6 (200 mT, 25 kHz, 100 °C)
< 6.7 (100 mT, 100 kHz, 100 °C)
Ordering code
B66387G0000X127
B66387G0000X187
1570 320
1700 320
* H = 250 A/m; f = 10 kHz; T = 100 °C
Gapped
Material
g
mm
0.500.05
1.000.05
1.500.05
A
L
value
approx.
nH
1214
716
526
e
Ordering code
** = 27 (N27)
**
= 87 (N87)
B66387G0500X1**
B66387G1000X1**
B66387G1500X1**
N27,
N87
265
156
115
The A
L
value in the table applies to a core set comprising one ungapped core (dimension g = 0) and
one gapped core (dimension g > 0).
Calculation factors
(for formulas, see
“E cores: general information”
)
Material
Relationship between
air gap – A
L
value
K1 (25 °C)
N27
N87
Validity range:
716
716
K2 (25 °C)
– 0.762
– 0.762
Calculation of saturation current
K3 (25 °C)
1231
1168
K4 (25 °C)
– 0.847
– 0.796
K3 (100 °C) K4 (100 °C)
1154
1131
– 0.865
– 0.873
K1, K2: 0.20 mm < s < 5.00 mm
K3, K4: 230 nH < A
L
< 2290 nH
Please read
Cautions and warnings
and
Important notes
at the end of this document.
2
06/13
E 65/32/27
Accessories
Coil former
Material:
Polyphenylene suplhide (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 °C), color code natur
Ryton R-4,
E54700 (M)
, CHEVRON PHILLIPS CHEMICAL CO L P
see Data Book 2013, chapter “Processing notes, 2.1”
A
N
mm
2
435
l
N
mm
246
A
R
value
19.5
Pins
–
Ordering code
B66388A2000T001
B66388
Winding:
Sections
1
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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