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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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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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

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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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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