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AN4149 Datenblatt(PDF) 13 Page - STMicroelectronics

Teilenummer AN4149
Bauteilbeschribung  Designing a CCM PFC pre-regulator based on the L4984D
PDF  43 Pages
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Hersteller  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
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AN4149 Datenblatt(HTML) 13 Page - STMicroelectronics

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AN4149
Designing a CCM FOT-controlled PFC
The maximum value of the RMS current circulating in the boost cell at the minimum line
voltage of the selected range is equal to:
Maximum RMS input current:
Equation 28
In order to describe the energy and relevant equations concerning a boost PFC, the ratios of
the voltage inputs of the boost converter to the regulated output voltage are defined. In
particular kmin and kmax refer to the ratio of the minimum and the maximum input voltage to
the output voltage, respectively.
Equation 29
Combining equation 28 and equation 29 the maximum line peak current can be found.
Maximum line peak current:
Equation 30
Maximum inductor peak current:
Equation 31
Inductor peak-to-peak ripple current :
Equation 32
In order to calculate the losses of the switches, the RMS current flowing through the
MOSFET and through the boost output diode are found.
Maximum RMS switch current:
PF
VAC
P
I
in
in
⋅
=
min
A
Vac
W
I
in
27
.
4
99
.
0
90
4
.
380
=
⋅
=
out
V
VAC
k
min
min
2
=
out
V
VAC
k
max
max
2
=
32
.
0
400
90
2
max
=
=
V
Vac
k
94
.
0
400
265
2
max
=
=
V
Vac
k
out
in
PK
V
k
P
I
⋅
⋅
=
min
max
2
A
V
W
I
PK
98
.
5
400
32
.
0
4
.
380
2
max
=
⋅
⋅
=
+
⋅
⋅
⋅
=
2
1
2
min
max
r
AC
in
PK
K
PF
V
P
IL
A
V
W
IL
PK
85
.
6
2
27
.
0
1
99
.
0
90
4
.
380
2
max
=
+
⋅
⋅
⋅
=
max
max
PK
r
PK
IL
K
IL
⋅
=
Δ
A
A
IL
PK
85
.
1
85
.
6
27
.
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ma x
=
⋅
=
Δ



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