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AN4149 Datasheet(PDF) 35 Page - STMicroelectronics

Part # AN4149
Description  Designing a CCM PFC pre-regulator based on the L4984D
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4149 Datasheet(HTML) 35 Page - STMicroelectronics

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DocID023523 Rev 2
35/43
AN4149
FOT PFC boost control loop
The closed-loop transfer function is the product of the control-to-output transfer function
(equation 85) and the E/A transfer function (equation 92):
Equation 101
The gain and the phase of the closed-loop transfer function is represented in the Bode plots
in Figure 20.
Figure 19. Bode plots of the closed-loop transfer function
Finally all the parameters describing the actual closed-loop transfer function are calculated.
Crossover frequency:
Equation 102
Phase margin:
Equation 103
E/A gain at 2fL:
2
100
2
3
0
2
⋅
−
Δ
⋅
=
C
COM P
out
fL
V
V
V
H
D
2
100
2
1
2
2
3
2
⋅
+
⋅
⋅
⋅
⋅
Δ
⋅
=
r
m
in
p
S
out
fL
K
k
P
k
R
V
H
D
286
.
1
2
100
2
27
.
0
1
23
.
0
4
.
380
10
8
011
.
0
2
2
/
81
.
14
011
.
0
3
3
=
⋅
+
⋅
⋅
⋅
⋅
Ω
⋅
⋅
=
−
W
D
AM13319v1
()
()
f
f
F
root
f
c
,
1
2
−
=
π
Hz
f
c
9
.
5
=
()
c
f
F
⋅
⋅
Φ
+
°
=
Φ
π
2
180
°
=
Φ
4
.
56



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