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| Input data |
Lo= |
0.76 |
uH |
Inductance |
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Iopkx= |
97.7 |
Apk |
Inductor maximum peak current |
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Ioppx= |
15.3 |
App |
Max peak to peak current |
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Iodcx= |
90.0 |
Arms |
Max avg current |
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Ioacx= |
4.4 |
Arms |
Max AC rms ripple current |
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fdc= |
360 |
kHz |
Frequency for B variation |
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Icd= |
6.0 |
A/mm2 |
Current density |
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Smp= |
1.3 |
mm |
Safety margin, Pri/HF winding, mm |
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Sms= |
1.3 |
mm |
Safety margin, Sec/LF winding, mm |
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Whm= |
7.1 |
mm |
Min winding height, mm |
E42/21/15 |
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Wwm= |
25.5 |
mm |
Min winding width, mm |
E42/21/15 |
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Ht= |
15.4 |
mm |
Core height or "C"
dimension |
E42/21/15 |
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Ltm= |
66.5 |
mm |
Min turn length |
E42/21/15 |
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le= |
98.4 |
mm |
Magnetic path length |
E42/21/15 |
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Ae= |
183 |
mm2 |
Magnetic core area, effective |
E42/21/15 |
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Am= |
183 |
mm2 |
Magnetic core area, minimum |
E42/21/15 |
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Vm= |
18,000 |
mm3 |
Magnetic volume |
E42/21/15 |
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ur= |
40 |
|
u, ungapped core, no DC bias |
K40 |
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Bmax= |
1.00 |
T |
Maximum flux density |
K40 |
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uh= |
90.5 |
% |
Permeability @ Hpk |
K40 |
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ncoin= |
1 |
|
Number of core sets |
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| Intermediate |
Ltm= |
66.5 |
mm |
Min turn length, ncoin sets |
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| data |
Ltn= |
94.9 |
mm |
Average turn length, ncoin sets |
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Aet= |
183 |
mm2 |
Magnetic core area, effective, ncoin
sets |
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Amt= |
183 |
mm2 |
Magnetic core area, minimum, ncoin
sets |
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Vmt= |
18,000 |
mm3 |
Magnetic volume, ncoin sets |
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Vc= |
15,021 |
mm3 |
Copper volume |
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Vt= |
33,021 |
mm3 |
Total inductor volume |
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ALc= |
7.9 |
nH/T2 |
AL, coil only |
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ALo= |
93 |
nH/T2 |
AL, ungapped core, no DC bias, one
set |
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ALot= |
93 |
nH/T2 |
AL, ungapped core, no DC bias, ncoin
sets |
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AL= |
85 |
nH/T2 |
AL, ungapped core, bias @ Hpk, ncoin
sets |
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ALg= |
84.7 |
nH/T2 |
Required core AL, gapped, bias @ Hpk |
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L0= |
0.07 |
uH |
Inductance, no cores |
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Lo0= |
0.91 |
uH |
Zero bias inductance, no gap, test
value |
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| Output data |
Nbmin= |
0.4 |
|
Minimum Number of turns |
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Nb= |
3.0 |
|
Number of turns, chosen |
> 1.2 x Nbmin |
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Bpk= |
0.14 |
T |
Actual peak flux density |
OK |
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Gap0= |
0.00 |
mm |
Core gap, no fringe effect |
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Gap= |
0.00 |
mm |
Core gap, closer to real |
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dBpk= |
11 |
mT |
Half of max B peak to peak variation |
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Hpksi= |
2,744 |
A/m |
Magnetizing Force, SI |
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Hpku= |
34 |
Oe |
Magnetizing Force, USA |
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Output Inductor Core Loss |
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| Intermediate |
P3= |
2 |
mW/cm3 |
Philips Ferrite 3F3 material |
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| data |
Pml= |
9 |
mW/cm3 |
Allied Signal MicroLite 245 material |
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Pm60= |
16 |
mW/cm3 |
Magnetics MPP 60u material |
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Pm125= |
26 |
mW/cm3 |
Magnetics MPP 125u material |
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Pk= |
61 |
mW/cm3 |
Magnetics Kool-Mu material |
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Ppl= |
117 |
mW/cm3 |
Allied Signal PowerLite material |
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Phf= |
41 |
mW/cm3 |
Magnetics High Flux 60u material |
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P18= |
117 |
mW/cm3 |
Micrometals Iron Powder 18 material |
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Rthm= |
8.9 |
°C/W |
Rth, toroid, open wound, natural
convection |
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| Output data |
P3= |
0.0 |
W |
3F3 |
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Pml= |
0.2 |
W |
MicroLite 245 |
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Pm60= |
0.3 |
W |
MPP 60u |
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Pm125= |
0.5 |
W |
MPP 125u |
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Pk= |
1.1 |
W |
Kool-Mu |
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Ppl= |
2.1 |
W |
PowerLite |
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Phf= |
0.7 |
W |
High Flux 60u |
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P18= |
2.1 |
W |
Iron Powder 18 |
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dT3= |
0 |
°C |
Core Temperature Rise, 3F3 |
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dTml= |
1 |
°C |
Core Temperature Rise, MicroLite 245 |
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dTm60= |
3 |
°C |
Core Temperature Rise, MPP 60u |
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dTm125= |
4 |
°C |
Core Temperature Rise, MPP 125u |
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dTk= |
10 |
°C |
Core Temperature Rise, Kool-Mu |
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dTpl= |
19 |
°C |
Core Temperature Rise, PowerLite |
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dThf= |
7 |
°C |
Core Temperature Rise, High Flux 60 |
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dT18= |
19 |
°C |
Core Temperature Rise, Iron Powder 18 |
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Output Inductor Copper Loss |
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| Intermediate |
Dpenm= |
0.133 |
mm |
Penetration depth, mm |
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| data |
Dpen= |
5.2 |
mil |
Penetration depth, mil |
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Sml= |
52 |
mil |
Safety margin, LF winding, mil |
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Smh= |
52 |
mil |
Safety margin, HF winding, mil |
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Ww= |
1.004 |
inch |
Winding width, available |
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Ltl= |
3.736 |
inch |
Average turn length, LF winding |
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Lth= |
3.736 |
inch |
Average turn length, HF winding |
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Wal= |
0.900 |
inch |
Winding width, LF winding |
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Waf= |
0.900 |
inch |
Winding width, HF winding |
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Dlf1= |
25.8 |
mil |
Thickness LF winding,required by
current density |
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Dlfc= |
60.0 |
mil |
Thickness, LF, chosen |
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Dlf2= |
90.2 |
mil |
Thickness, LF winding (winding height
limited) |
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Alf= |
34.84 |
mm2 |
Cross section area, LF winding |
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Dhf= |
7.620 |
mm |
Diameter, HF winding wire |
x 1 |
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Dhfc= |
1.524 |
mm |
Diameter, HF winding wire, chosen |
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Ahfc= |
34.84 |
mm2 |
Cross section area, HF winding,
chosen |
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Qs= |
11.49 |
|
Layer thickness/penetration depth, HF
winding |
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Po= |
3.0 |
|
Number of layers per winding portion |
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Fro= |
72.79 |
|
Rac/Rdc ratio, HF winding |
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Tc= |
125.0 |
°C |
Actual copper temperature |
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| Output data |
Poicrl= |
1.1 |
W |
Core Power Loss, Kool-Mu |
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Pgap= |
0.0 |
W |
Gap related loss |
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Rdclf= |
0.2 |
mOhm |
DC resistance, low frequency winding |
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Rdchf= |
0.2 |
mOhm |
DC resistance, high frequency winding |
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Rachf= |
14.9 |
mOhm |
AC resistance, high frequency winding |
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Poilfl= |
1.7 |
W |
Low frequency winding copper loss |
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Poihfl= |
0.3 |
W |
High frequency winding copper loss |
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Poitcpl= |
1.9 |
W |
Total Copper Loss |
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Poitl= |
3.0 |
W |
Inductor total loss |
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Rth= |
6.4 |
°C/W |
Rth, toroid, open wound, natural
convection |
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dT3= |
19 |
°C |
Temperature Rise, natural convection |
For comparison only |
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| We suggest using class H(180°C) for Power Magnetics (Boost
Inductor, Power Transformer and Output Inductor). |
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| The operating core temperature is assumed to be 100°C for
core loss calculation. |
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| Minimum loss would be at 80-90°C. |
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| Maximum core operating temperature should be <160°C
(Tc=200°C-40°C margin). |
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| The accuracy of the formulas for core loss is expected to be
±10%. |
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| The accuracy of the formulas for temperature rise is expected
to be ±30%. |
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| Temperature rise is for natural convection cooling. |
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| For forced (fan) cooling the temperature rise could be 1/2 to
1/3, depending on airflow. |
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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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