PM 74/59
Core
■
To IEC 61247
■
Particularly suitable for power transformers
B65686
and energy storage chokes
■
Delivery mode: sets
Magnetic characteristics
(per set)
l/A = 0.162 mm
–1
l
e
= 128 mm
A
e
= 790 mm
2
A
min
= 630 mm
2
V
e
= 101000 mm
3
Approx. weight
537 g/set
Gapped
(A
L
values/air gaps examples)
Material
A
L
value
nH
N27
315 3%
630 3%
s
approx.
mm
3.80
1.50
e
Ordering code
41
81
B65686A0315A027
B65686A0630A027
Ungapped
Material
A
L
value
nH
N27
N87
10000 +30/–20% 1290
10000 +30/–20% 1290
e
P
V
W/set
Ordering code
< 7.5 (150 mT, 25 kHz, 100 C) B65686A0000R027
< 9.6 (100 mT, 100 kHz, 100 C) B65686A0000R087
see Processing remarks on page 5.
Other A
L
values/air gaps and materials available on request
Please read
Cautions and warnings
and
Important notes
at the end of this document.
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PM 74/59
Accessories
Coil former
Material:
GFR polyterephthalate (UL 94 V-0, insulation class to IEC 60085:
F max. operating temperature 155 C), color code black
Valox 420-SE0 [E45329 (M)] SABIC INNOVATIVE PLASTICS B V
Solderability: to IEC 60068-2-20, test Ta, method 1 (aging 3): 235 C, 2 s
Resistance to soldering heat: to IEC 60068-2-20, test Tb, method 1B: 350 C, 3.5 s
Winding:
see Processing notes, 2.1
Also available without solder pins.
Sections
1
1
A
N
mm
2
442
442
l
N
mm
140
140
A
R
value
10.9
10.9
Solder
pins
18
—
Ordering code
B65687A1018T001
B65687A1000T001
B65687
Please read
Cautions and warnings
and
Important notes
at the end of this document.
3
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PM 74/59
Accessories
Mounting assembly
■
For chassis mounting
1)
or printed circuit boards
■
The set comprises a yoke and a base plate
■
Fixing nuts M3 and washers are supplied
B65687
Yoke
■
Material: Brass clamping yoke (
3 mm) with thread
Base plate
■
Material: Aluminum (0.6 mm)
Ordering code
Complete mounting assembly including nuts and washers
B65687A2000X000
1) On a chassis the coil former must be mounted with its solder pins upward.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
4
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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 tempera-
ture 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 data book, chapter
“General - Definitions, 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 data book, chapter
“General - Definitions, 8.1”.
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.
Ferrite Accessories
EPCOS ferrite accessories have been designed and evaluated only in combination with EPCOS
ferrite cores. EPCOS explicitly points out that EPCOS ferrite accessories or EPCOS ferrite cores
may not be compatible with those of other manufacturers. Any such combination requires prior te-
sting by the customer and will be at the customer‘s own risk.
EPCOS assumes no warranty or reliability for the combination of EPCOS ferrite accessories with
cores and other accessories from any other manufacturer.
Processing remarks
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 oxyde of the tin bath or burned insula-
tion of the wire. For detailed information see chapter
“Processing notes”,
section 2.2.
– 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.
Please read
Cautions and warnings
and
Important notes
at the end of this document.
5
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