| Project "Ultimate" 2004 |
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| Input data |
Vba= |
407 |
Vdc |
Average Boost Voltage |
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Vbm= |
399 |
Vdc |
Minimum Boost Voltage |
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Iba= |
6.6 |
A |
Average PFC output current |
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fdc= |
180 |
kHz |
Switching Frequency, DC/DC Converter |
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Voutn= |
27.220 |
Vdc |
Nominal DC Output Voltage |
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Voutx= |
29.942 |
Vdc |
Maximum DC Output Voltage |
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Ioutn= |
90.00 |
Adc |
Nominal Output Current |
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Ioutx= |
99.00 |
Adc |
Maximum Output Current |
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Ddch= |
0.5 |
% |
Duty Cycle head-room @ Maximum Output
Voltage |
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Dicx= |
99.5 |
% |
Max available PWM IC Duty Cycle |
Due to PWM IC |
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Effdc= |
91.87 |
% |
DC/DC Efficiency |
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Effdc= |
91.87 |
% |
DC/DC Efficiency, initial estimation |
copy from above cell |
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Irdc= |
17.0 |
% |
Ripple Current, Output Ind., Nom.
Output, pk-pk, % from avg |
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Im= |
28.0 |
% |
Magnetizing current, primary, pk-pk,
max, % from avg |
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tsw= |
75 |
ns |
Voltage Rise and Fall times for
bridge switches |
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Rdson= |
0.379 |
Ohm |
Actual MOSFET(s) Rds ON |
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Coer= |
253 |
pF |
MOSFET output capacitance @ Vba |
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VF= |
1.29 |
V |
Diode(s) forward voltage at operating
current |
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Vrpn= |
5 |
mVrms |
Output Maximum Ripple Voltage,
Nominal Output |
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Ilss= |
80 |
% |
Minimum load for Soft Switch |
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kp= |
2 |
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1 for Hard Switching, 2 for Phase
Shift |
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ks= |
1 |
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1 for Center Tap, 2 for Current
Doubler |
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N= |
0.0833 |
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Actual Secondary to Primary Turn
Ratio |
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| Intermediate |
Poutn= |
2,450 |
W |
Maximum Output Power, DC/DC Stage |
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| data |
tdc= |
5.56 |
us |
Switching Period, DC/DC Converter |
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Iavg= |
7.5 |
A |
Average primary current |
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Irdcpk= |
1.3 |
A |
Primary pk-pk ripple current
reflected from sec. |
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Impk= |
2.1 |
A |
Primary pk-pk magnetizing current |
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Idppx= |
3.4 |
App |
Primary total pk-pk current |
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Itpk= |
9.2 |
A |
Peak Current Bridge Switch |
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Ibchfx= |
2.7 |
Arms |
DC input Capacitor, max HF ripple
current |
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Vt= |
2.84 |
V |
Average Voltage drop, Bridge Switches
@ Nominal Output |
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Ddcx1= |
96.8 |
% |
Maximum Available Duty Cycle |
Due to dV/dt + IC |
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Nm= |
0.0838 |
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Minimum Secondary to Primary Turn
Ratio |
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Ilopk= |
97.7 |
Apk |
Output Inductor Peak Current |
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Ilopp= |
15.3 |
App |
Output Inductor Ripple, Peak to Peak |
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Irpr= |
4.4 |
Arms |
Output Inductor Ripple, RMS |
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| Output data |
Iprrms= |
7.6 |
Arms |
RMS Current, Transformer Primary |
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Iscrms= |
45.1 |
Arms |
RMS Current, Transformer Secondary |
Eq.
end to end-Idc |
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Loc= |
0.76 |
uH |
Output Inductor, calculated |
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Lo= |
0.76 |
uH |
Output Inductor, chosen |
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Comin= |
391 |
uF |
Minimum Output Capacitor (Zero ESR) |
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C401= |
3,240 |
uF |
Output Capacitor(s), chosen |
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Resrx= |
1.1 |
mOhm |
Maximum Output Capacitor ESR
(Infinite capacitance) |
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ESR1= |
8.5 |
mOhm |
Output Capacitor(s) ESR, chosen |
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RLoad= |
0.302 |
Ohm |
Load Resistance |
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Vrp2= |
36.5 |
mVrms |
Output ripple voltage, first stage
filter |
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Attn2m= |
7.3 |
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Required second stage filter
attenuation |
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Llkg= |
1.21 |
uH |
Leakage inductance for soft switch |
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tdlk= |
41.5 |
ns |
Dead time due to leakage inductance |
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Ddcn= |
86.84 |
% |
Nominal DC/DC Stage Duty Cycle |
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Ddcx= |
95.31 |
% |
Max available DC/DC Stage Duty Cycle |
Due to dV/dt+Llkg |
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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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