3F36 - Ferroxcube

3F36
Improved performance
at low temperature
Flat loss, medium
to high frequency
power material for
broad temperature
range applications.
ERROXCUBE is a member of the Yageo Group,
F
which is among the world's strongest suppliers of high
quality passive components. As a leading supplier of
ferrite components. FERROXCUBE has manufacturing
operations, sales offices, and customer service centers
all over the world.
We supply one of he broadest ranges of high-quality,
innovative products and place strong emphasis
on miniaturization of magnetic functions. Ferrite
components and accessories from FERROXCUBE
are used in a wide range of applications, from
telecommunications and computing electronics
through consumer electronic products to automotive.
FERROXCUBE as the leading manufacturer in the
ferrite industry, has been providing to the power
conversion industry ferrite cores with low power
losses and high saturation magnetic flux density
over a wide range of operating frequencies (20kHz
to 10MHz). This has allowed us to support today's
manufacturers of power conversion systems in their
drive for greater miniaturization, lower weight and
reduced power consumption in applications where
the temperature rise and maximum achievable
temperature can be estimated.
The switching frequency of power conversion equipment is continuously growing, searching for both efficiency and
miniaturization. These working conditions require specific properties from the transformers and inductors in order to
minimize magnetic power loss in the system: These properties include extended frequency bandwidth, high resistivity
to prevent eddy currents and a flat response over a temperature range for reliable behavior in outdoor applications.
Temperature stability is also a key design parameter in reaching the highest efficiency awards when tested under light
load conditions when the system is not heating itself.
Ferroxcube 3F36 has been developed to work in this field with a flat response over a temperature range and optimal
operating frequency spanning from 250 kHz to 1 MHz keeping a maximum magnetic flux density as high as 420 mT (at
100 deg C, 1200 A/m).
Target applications are many: automotive DC/DC converters in hybrid and electric vehicles, photovoltaic microinverters, DC/DC converters in telecommunication and computing equipment or high power LED drivers for public
lighting are among some of the potential applications.
3F36
Improved performance at low
temperature
3F36
Material Specifications
Fig. 1 Complex permeability as a function
of frequency
Fig. 2 Initial permeability as a function
of temperature
Fig. 3 Typical B-H loops
Fig. 4 Amplitude permeability as function
of peak flux density
Fig. 5 Specific power loss as a function of
peak flux density with frequency as
a parameter
Fig. 6 Specific power loss for several frequency/flux density
combinations as a function
of temperature
5
3F36 vs 3F35
Symbol Conditions
μi
μa
Bsat
PV
ρ
25 °C; ≤10 kHz, 0.25 mT
100 °C; 25 kHz, 200 mT
25 °C; 10 kHz, 1200 A/m
100 °C; 10 kHz, 1200 A/m
25 °C; 400 kHz; 50 mT
100 °C; 400 kHz; 50 mT
25 °C; 500 kHz; 50 mT
100 °C; 500 kHz; 50 mT
25 °C; 500 kHz; 100 mT
100 °C; 500 kHz; 100 mT
DC; 25 °C
TC
Density
3F36
1600±25%
≈ 2400
≈ 520
≈ 420
≈ 70
≈ 60
≈ 110
≈ 90
≈ 700
≈ 700
≈ 12
≥230
≈ 4750
Value
3F35
1400±25%
≈ 2400
≈ 500
≈ 420
≈ 120
≈ 60
≈ 170
≈ 90
≈ 900
≈ 700
≈ 10
≥240
≈ 4750
Unit
mT
3
kW/m
Ωm
°C
3
kg/m
Power Loss Comparison
Ferroxcube provides also 3C95, a flat loss material optimized for frequencies up to 400 kHz. Graph below shows 3C95
performance factor data to help select the optimum material when the frequency is in the overlapping area.
handbook, full pagewidth
80000
f x Bmax
(Hz T)
Pv = 500 mW/cm3
100 °C
30 °C
60000
3F36
40000
3C95
3C94
20000
0
10 −2
6
10 −1
1
operating freq. (MHz)
10
3F36
The performance factor (f x Bmax) is a measure of the throughput power that a ferrite core
can handle at a certain loss level.
Each material has its optimum operating frequency range. Above 300kHz 3F36 will benefit in
higher throughput power than Ferroxcube well known 3C95 material.
In typical ferrite materials like 3C94 performance factor at room temperatures drops down due to the saddle shape of
the losses versus temperature curve.
3F36 and 3C95 exhibits no drop at room temperatures, and this is what makes of them best materials for broad
temperature applications.
Design remarks: Power loss curve fit parameters
It maybe necessary to calculate the core loss density in different conditions when designing a transformer or inductor.
An approximation of the core loss density for any combination of operating temperature (T) in [° C], frequency (f) in
[Hz] and flux density (B) in [T] can be obtained from the following empirical fit formula :
Material
Freq min
Freq max
Cm
x
y
Ct 2
Ct 1
Ct
3F35
100000
499999
6.83E-03
1.4390
3.2672
1.614E-04
3.352E-02
2.759E+00
3F35
500000
799999
1.12E-07
2.1952
2.7199
1.284E-04
2.105E-02
1.801E+00
3F35
800000
1200000
2.24E-10
2.6105
2.4977
8.170E-05
1.011E-02
1.152E+00
3F36
100000
499999
6.83E-03
1.4390
3.2672
8.395E-05
1.078E-02
1.233E+00
3F36
500000
799999
1.12E-07
2.1952
2.7199
8.926E-05
1.172E-02
1.282E+00
3F36
800000
1200000
2.24E-10
2.6105
2.4977
6.119E-05
6.142E-03
1.011E+00
Results obtained with this formula are an estimation of typical material performance. Product specs will show higher
power loss density.
7
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Printed in Poland
Document order number: FXC 100 00004
Date of release: May 2014