Post on 02-Aug-2020
Evaluating ferrite materials with optimized performance under
real-world conditions
Presented by:Fair-Rite Products
John Lynch Michael ArasimDirector of Engineering Engineering Lab Team Leader
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100,000 1,000,000 10,000,000 100,000,000
Bf (
mT*
MHz
)
Frequency (Hz)
FR79
FR67
EXP80
Performance Factor(500mW/cc) for Fair-Rite’s Materials
Good performance at frequencies > 5MHz -Few designs currently operating at these frequencies-Great material for future high power density designs
Good performance at frequencies < 1MHz-Increasingly more designs moving to this frequency range-Not a future-proof material as frequencies move past 1MHz
New 80 material developed to cover the middle-ground where SiC and GaN Mosfets are currently operating
500kHz 75mT
Max Temperature
79 Material EQ20 80 Material EQ20
45.1°C 56.8°C
Final Temperature Difference = 11.7°C.
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Tem
pera
ture
(deg
C)
Time (ms)
500kHz 75mT
9579200602 9580200602
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P.L. (mW/cm^3)
B (mT)
500kHz Power Loss vs Flux Density at 25ºC
80
79
Measured on a 17.80mm x 9.70mm x 5.90mm toroid.
79 80Core EQ20 EQ20Ve(cm3) 2.00 2.00Frequency(kHz) 500 500Flux Density(mT) 75 75Pv (mW/cm3) 350 600T (degrees C) 45.1 56.8AL(nH) 2440 1210
750kHz 70mT
Max Temperature
79 Material EQ20 80 Material EQ20
55.7°C 56.1°C
Final Temperature Difference = 0.4°C.
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Tem
pera
ture
(deg
C)
Time (ms)
750kHz 70mT
9579200602 9580200602
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1000
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P.L. (mW/cm^3)
B (mT)
750kHz Power Loss vs Flux Density at 25ºC
80
79
Measured on a 17.80mm x 9.70mm x 5.90mm toroid.
79 80Core EQ20 EQ20Ve(cm3) 2.00 2.00Frequency(kHz) 750 750Flux Density(mT) 70 70Pv (mW/cm3) 500 600T (degrees C) 55.7 56.1AL(nH) 2440 1210
1MHz 50mT
Max Temperature
79 Material EQ20 80 Material EQ20
47.7°C 38.2°C
Final TemperatureDifference = 9.5°C.
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Tem
pera
ture
(deg
C)
Time (ms)
1MHz 50mT
9579200602 9580200602
79 80Core EQ20 EQ20Ve(cm3) 2.00 2.00Frequency(MHz) 1 1Flux Density(mT) 50 50Pv (mW/cm3) 420 260T (degrees C) 47.7 38.2AL(nH) 2440 1210
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100.0
1000.0
10 20 30 40 50 60 70 80 90 100
P.L. (mW/cm^3)
B (mT)
1MHz Power Loss vs Flux Density at 25ºC
80
79
Measured on a 17.80mm x 9.70mm x 5.90mm toroid.
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400
500
600
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P.L. (mW/cm3)
Temperature (ºC)
79 Material Power Loss vs Temperature
100kHz/150 mT
300kHz/100 mT
500kHz/50 mT
750kHz/50 mT
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500
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P.L.(mW/cm^3)
Temperature (°C)
80 Material Power Loss vs Temperature
1MHz/50 mT
2MHz/30 mT
3MHz/20 mT
4MHz/10 mT
Summary
• Market moving toward higher frequency with smaller core sizes.
• Materials developed to cover the higher frequencies:– 79 material (f5MHz), optimized
• 79, 80, and 67 offer:– Stable permeability with increased flux densities
and DC currents over frequency.– Low power loss density at higher frequencies
covering a range from 500kHz to over 10MHz.– Stable power loss densities over temperature.
• Fair-Rite currently offers toroids and EQ cores and continues to add new parts. • Custom parts and evaluation kits available upon request.
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Bf (m
T*M
Hz)
Frequency (Hz)
Evaluating ferrite materials with optimized performance under �real-world conditionsPerformance Factor(500mW/cc) for Fair-Rite’s Materials500kHz 75mTSlide Number 4750kHz 70mTSlide Number 61MHz 50mTSlide Number 8Slide Number 9Slide Number 10Summary