1.
Introduction
 Iron
cores are made iron mixed with bonding powder.
The base material is iron-powdered, known
as Iron.
These material cores offer various excellent
electro-magnetic properties, such as high
saturation flux density, high resistivity,
and stable permeability under high DC bias
conditions.
Dongbu Iron cores are suitable for power chokes
and filters, especially in switching mode
power supplies(SMPS).
|
2.
Availability
Dongbu Iron cores are available in a variety
of physical sizes and two permeabilities(60,
75). Epoxy coated toroidal cores and E-cores
are typically supplied to the customers.
More detailed informations are refered to
the technical data on core properties and
dimensions in the following pages.
3. Advantages
- Excellent DC Bias characteristics
- High Bmax of 15,000 G compared to MPP or
Ferrites.
- Core losses significantly lower than powdered
iron cores.
- Large energy storage capacity
4. Major Applications
- In-line noise filters
- Switching regulator iductors
- Pulse transformer, Fly-back transformer,
PFC
5. Material
properties
|
| Material
code |
#11 |
#16 |
#17 |
#19 |
Color
Applicable frequency
Initial permeability
Temperature coefficient
(ppm/degree, ℃)
Inductance tolerance
Core loss (mW/cc)
(100kHz, 100G)
DC bias characteristics,%
(1kHz, 50 Oe) |
White
Up to 50kHz
60
930
± 10%
50
55
|
Yellow/White
100kHz
75
895
± 10%
44
51
|
Green/Blue
500kHz
75
660
± 10%
27
60
|
Yellow/Red
2MHz
35
220
± 10%
14
88
|
|
6. CORE IDENTIFICATION
|
* Finish
Code : All Dongbu Magnetics powdered iron
toroidal cores have a minimum
dielectric strength of 1,000Vrms.
7. INDUCTANCE
The cores are manufactured to the
AL values listed :
the permeability for each material is for
reference only.
The iron toroidal cores are typically tested
with a full single layer winding.
The IE cores are tested with 100 turns.
In all cases, the AL values are based on a
peck AC flux density of 10 gauss at a test
frequency of 10 Khz.
8.
TEMPERATURE EFFECTS
Operating temperature of Dongbu iron powder
cores is from-55 degree ℃ to+125 degree ℃.
But because of higher Curie temperature of
iron powder material itself, It will work
properly to several hundred degree ℃.
However, continuous operation over 125 degree
℃ core temperature may cause a permanent damage
of insulation of iron powder itself, and coating
material, which results in decrease of inductance,
increase of core loss, etc.
Degree of this change depends upon the conditions
functioning out of the above limit.
So high temperature application dominated
mainly by outstanding core loss is not recommended
for continuously proper operation in the circuitries,
ie, higher frequency, comparatively large
current AC chokes. |
| |
