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AN3142 Datasheet(PDF) 12 Page - STMicroelectronics

Part # AN3142
Description  Solution for designing a 400 W fixed-off-time controlled
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3142 Datasheet(HTML) 12 Page - STMicroelectronics

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Designing a fixed-off-time PFC
AN3142
12/44
Doc ID 17005 Rev 3
Equation 14
Inductor peak current:
Equation 15
It is also possible to calculate the RMS current flowing into the switch and into the diode,
needed to calculate the losses of these two elements.
RMS switch current:
Equation 16
RMS diode current:
Equation 17
It is worth remembering that the accuracy of the approximate energetic relationships
described here is quite good at maximum load for low values of parameter k, that is, at low
line voltage, but worsens at high line and as the power throughput is reduced. Since in the
design phase current stress is calculated at maximum load and minimum line voltage, their
accuracy is acceptable for design purposes.
max
PK
r
r
pk
I
k
3
8
k
6
IL
⋅
⋅
−
⋅
=
∆
A
04
.
2
A
98
.
6
34
.
0
3
8
34
.
0
6
IL
pk
=
⋅
⋅
−
⋅
=
∆
max
PK
r
max
pk
I
k
3
8
8
IL
⋅
⋅
−
=
A
01
.
8
A
98
.
6
34
.
0
3
8
8
IL
max
pk
=
⋅
⋅
−
=
π
⋅
−
⋅
⋅
=
3
k
16
2
V
k
P
ISW
min
out
min
in
rms
A
22
.
4
3
32
.
0
16
2
V
400
32
.
0
W
400
ISW
rms
=
π
⋅
−
⋅
⋅
=
π
⋅
⋅
=
3
k
16
V
k
P
ID
min
out
min
in
rms
A
57
.
2
3
32
.
0
16
V
400
32
.
0
W
400
ID
rms
=
π
⋅
⋅
⋅
=



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