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AN4149 Datasheet(PDF) 34 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) 34 Page - STMicroelectronics

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FOT PFC boost control loop
AN4149
34/43
DocID023523 Rev 2
Equation 96
Equation 97
Then the values of the components can be calculated as follows.
Feedback parallel capacitor:
Equation 98
A value of 22 nF has been selected for the parallel feedback capacitor.
Feedback series capacitor:
Equation 99
A value of 220 nF has been selected for the series feedback capacitor.
Feedback series resistor:
Equation 100
A value of 330 k
Ω has been selected for the series feedback resistor.
The gain and the phase of the transfer function of the type II amplifier are represented in the
bode plots in Figure 19.
Figure 18. Bode plots of a type II amplifier's transfer function
K
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.
955
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.
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.
955
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3
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out H
o
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Hz
Hz
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14
9
.
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2
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6
.
6
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0
1
1
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−
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1
2
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Hz
Hz
Hz
nF
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287
2
.
2
2
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2
9
.
30
22
2
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−
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k
nF
Hz
R
8
.
328
220
2
.
2
2
1
2
π
AM13318v1



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