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AN3112 датащи(PDF) 29 Page - STMicroelectronics

номер детали AN3112
подробное описание детали  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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AN3112 датащи(HTML) 29 Page - STMicroelectronics

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AN3112
Designing a fixed-off-time PFC
Doc ID 16820 Rev 3
29/36
Equation 65
Equation 66
A commercial value R = 15 k
Ω and a R0 = 1.5 kΩ has been chosen.
Figure 17 and Figure 18 show the trend of the off-time and the switching frequency vs the
input mains voltage. The PFC inner current loop works in the range of 80 kHz-150 kHz.
Due to the tolerance of the capacitor selected (C) and the two discharging resistors, it is
important to take into account a variation on the switching frequency in a real board of about
± 10%.
Finally the Rs limiting resistor should be selected according to the inequalities (
Equation 6):
Equation 67
and the speed-up capacitor Cs using
Equation 7.
Equation 68
This means that after calculations:
1
eq
K
1
R
R
−
=
Ω
=
−
Ω
=
k
79
.
15
903
.
0
1
k
53
.
1
R
1
eq
0
K
R
R
=
Ω
=
Ω
=
k
5
.
1
903
.
0
k
53
.
1
R
0
Figure 17.
Off-time vs. input mains voltage
Figure 18.
Switching frequency vs. input
mains voltage
V
7
.
5
V
6
.
0
V
7
.
5
V
10
k
53
.
1
Rs
k
53
.
1
V
7
.
5
mA
10
V
6
.
0
V
7
.
5
V
15
−
−
⋅
Ω
<
<
Ω
+
−
−
V
6
.
0
V
7
.
5
V
15
V
7
.
5
pF
220
Cs
−
−
⋅
<



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