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AN3112 数据表(PDF) 28 Page - STMicroelectronics

部件名 AN3112
功能描述  Solution for designing a fixed off-time controlled PFC pre-regulator
PDF  36 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

AN3112 数据表(HTML) 28 Page - STMicroelectronics

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Designing a fixed-off-time PFC
AN3112
28/36
Doc ID 16820 Rev 3
Equation 59
Equation 60
From
Equation 56 and Equation 59, solving the following equation:
Equation 61
And then substituting K1 value into the
Equation 60 expression, the k2 parameters are
obtained:
Equation 62
From the values of K1 and K2 it is possible to calculate the time constant
τ =(R1//R2) C
necessary to achieve the desired TOFF@90 Vac:
Equation 63
Now, by selecting a capacitor C in the hundred picofarad range or a few nanofarads, for
example a C =220 pF, it is possible to determine the required equivalent resistance value:
Equation 64
From
Equation 57 R and R0 are found:
[]
[]
[]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟⎟⎠
⎞
⎜⎜⎝
⎛
+
+
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⋅
+
−
−
⋅
+
⎥
⎥
⎥
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎢
⎢
⎢
⎣
⎡
⎟
⎟
⎟
⎟
⎠
⎞
⎜
⎜
⎜
⎜
⎝
⎛
+
⋅
+
⎥
⎥
⎥
⎥
⎥
⎦
⎤
⎢
⎢
⎢
⎢
⎢
⎣
⎡
⋅
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎥
⎦
⎤
⎢
⎣
⎡
+
⋅
−
−
⋅
⎥
⎦
⎤
⎢
⎣
⎡
+
⋅
=
ρ
−
−
F
min
mult
ZCDtrigger
k
1
1
F
min
mult
ZCDclamp
1
F
min
mult
F
min
max
min
mult
ZCDtrigger
k
1
1
F
min
max
min
mult
ZCDclamp
1
F
min
max
min
mult
1
min
mult
V
V
V
ln
)
k
(
V
V
V
)
k
1
(
V
V
ln
V
VAC
VAC
V
V
ln
)
k
(
V
VAC
VAC
V
V
)
k
1
(
V
VAC
VAC
V
ln
)
k
,
V
(
1
1
[]
[]
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟⎟⎠
⎞
⎜⎜⎝
⎛
+
+
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⋅
+
−
−
⋅
+
⋅
−
−
=
−
F
min
mult
ZCDtrigger
k
1
1
F
min
mult
ZCDclamp
1
F
min
mult
1
1
min
mult
2
V
V
V
ln
k
V
V
V
)
k
1
(
V
V
ln
k
1
1
)
k
,
V
(
k
1
0
)
k
,
V
(
x
1
min
mult
=
ρ
−
ρ
903
.
0
K1 =
)
k
,
V
(
k
K
1
min
mult
2
2 =
17
.
11
K2 =
2
min
OFF
K
)
VAC
(
T
=
τ
ns
35
.
336
17
.
11
s
76
.
3
=
µ
=
τ
C
Req
τ
=
Ω
=
=
k
53
.
1
pF
220
ns
35
.
336
R
eq



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