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| Input data |
Vr= |
68 |
V |
Reverse voltage across the rectifier diode |
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If= |
45 |
A |
Forward current in the rectifier
diode |
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trr= |
25 |
ns |
Reverse recovery time of the
rectifier diode |
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fdc= |
180 |
kHz |
Frequency for B variation |
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Ae= |
12.9 |
mm2 |
Magnetic core area |
59 85 000 301 |
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le= |
29.5 |
mm |
Magnetic path length |
59 85 000 301 |
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Vm= |
381 |
mm3 |
Magnetic Volume |
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Vt= |
381 |
mm3 |
Total core volume |
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AL0= |
|
nH/T2 |
AL, ungapped core, no DC bias |
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ur= |
900 |
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Relative permeability, ungapped, no
DC bias |
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Bmax= |
400 |
mT |
Maximum flux density @ 100degC |
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| Intermediate |
Ft= |
10.3 |
uWb |
Total Flux |
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| data |
Pmt= |
1,852 |
mW/cm3 |
Core loss, Toshiba MT, 50kHz to
300kHz |
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Pms= |
2,652 |
mW/cm3 |
Core loss, Toshiba MS, 50kHz to
300kHz |
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Pas= |
2,660 |
mW/cm3 |
Core loss, Allied Signal 2714AS,
50-300kHz |
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P3= |
5,284 |
mW/cm3 |
Core loss, Philips 3F3, 50kHz to
300kHz |
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P85= |
6,189 |
mW/cm3 |
Core loss, Fair-Rite 85 Material,
20-100kHz |
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Rth= |
71.1 |
K/W |
Rth, toroid, open wound, natural
convection |
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| Output data |
Np= |
0.5 |
|
Minimum number of turns |
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Nr= |
1 |
|
Number of turns, chosen |
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Hpko= |
1,525 |
A/m |
Magnetizing Force, SI |
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Hpko= |
19 |
Oe |
Magnetizing Force, USA |
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Pmt= |
0.7 |
W |
Core Loss, Toshiba MT |
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Pms= |
1.0 |
W |
Core Loss, Toshiba MS |
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Pas= |
1.0 |
W |
Core Loss, AlliedSignal 2714AS |
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P3= |
2.0 |
W |
Core Loss, 3F3 |
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P85= |
2.4 |
W |
Core Loss, Fair-Rite 85 Material |
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dTmt= |
50 |
°C |
Core Temperature Rise, Toshiba MT |
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dTms= |
72 |
°C |
Core Temperature Rise, Toshiba MS |
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dTas= |
72 |
°C |
Core Temperature Rise, AlliedSignal |
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dT3= |
143 |
°C |
Core Temperature Rise, 3F3 |
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dT85= |
167 |
°C |
Core Temperature Rise, Fair-Rite |
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| The operating core temperature is assumed to be 100°C |
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| Minimum loss would be at 80-90°C |
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| Maximum core operating temperature should be <140°C |
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| The accuracy of the formulas is expected to be ±20% |
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| SMPS Power Supplies, Inc. |
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| Doing The Right Thing Is The Right Thing To Doä |
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| www.PowerSupplies.net |
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| www.GoToPower.net |
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| Copyright © 1998-2005 SMPS Power Supplies,
Inc. All rights reserved. |
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| Copyright © 1990-1997 LCD Consulting |
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| Copyright © 1979-1989 Constantin Darius Livescu |
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