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AN3112 Datenblatt(PDF) 11 Page - STMicroelectronics

Teilenummer AN3112
Bauteilbeschribung  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3112 Datenblatt(HTML) 11 Page - STMicroelectronics

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AN3112
Designing a fixed-off-time PFC
Doc ID 16820 Rev 3
11/36
4.2
Operating condition
The first step is to define the main parameters of the circuit, using the specification points
given in
Section 4.1 on page 9:
Rated DC output current:
Equation 8
Maximum input power:
Equation 9
Referring to the main currents shown in
Figure 1, the following formula expresses the
maximum value of current circulating in the boost cell which means at minimum line voltage
of the selected range:
RMS input current:
Equation 10
It is important to define the following ratios in order to continue describing the energetic
relationships in the PFC:
Equation 11
Equation 12
From
Equation 11 and Equation 12:
Line peak current:
Equation 13
Inductor Ripple-
∆ILpk:
out
out
out
V
P
I
=
A
00
.
1
V
400
W
400
I
out
=
=
η
= out
in
P
P
W
44
.
444
100
90
W
400
Pin
=
⋅
=
PF
VAC
P
I
min
out
in
⋅
=
A
99
.
4
99
.
0
Vac
90
W
400
I
in
=
⋅
=
out
min
min
V
VAC
2
k
=
32
.
0
V
400
Vac
90
2
kmin
=
=
out
max
max
V
VAC
2
k
=
94
.
0
V
400
Vac
265
2
k
max
=
=
out
min
in
max
PK
V
k
P
2
I
⋅
⋅
=
A
98
.
6
V
400
32
.
0
W
44
.
444
2
I
max
PK
=
⋅
⋅
=



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