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AN1089 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN1089
Description  CONTROL LOOP MODELING OF L6561-BASED TM PFC
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN1089 Datasheet(HTML) 8 Page - STMicroelectronics

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Transfer Function:
G1
(ω) := GO ⋅
1
+ j ⋅
ω
2
⋅ π ⋅ z
1
+ j ⋅
ω
2
⋅ π ⋅ p
Open Loop Transfer Function (constant power load):
F(
ω): = G (ω) ⋅ G1 (ω)
ΦF(ω): = arg (F(ω)) ⋅
180
π
Crossover Frequency:
fc: = |root (|F(2
⋅ π ⋅ f)| - 1, f)|
fc = 18.836
Hz
Phase Margin:
Φ : = 180 + ΦF(2 ⋅ π ⋅ fc)
Φ = 52.167
°
0.1
1
10
100
1 .10
3
60
40
20
0
¦G1¦
f
0.1
1
10
100
1 .10
3
100
80
60
40
20
0
/G1
f
0.1
1
10
100
1 .10
3
100
0
100
¦F¦
f
0.1
1
10
100
1 .10
3
200
160
120
80
40
0
/F
f
AN1089 APPLICATION NOTE
8/12



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