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AN4149 Datasheet(PDF) 5 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) 5 Page - STMicroelectronics

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DocID023523 Rev 2
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AN4149
CCM PFC using FOT control
then, the switching period TSW will be:
Equation 3
In the end, if TOFF is changed proportionally to the instantaneous line voltage, i.e. if:
Equation 4
then TSW will be equal to Kt·Vout and, since Vout is regulated by the voltage loop, also TSW
(and fSW=1/TSW) will be fixed. This result is based on the sole assumption that the
instantaneous line voltage and the output load are such that the boost inductor operates in
CCM.
Figure 3. Block diagram of an FOT-controlled PFC preregulator
OFF
OFF
OFF
OFF
ON
sw
T
sin
Vpk
Vout
T
T
sin
Vpk
Vout
T
T
T
θ
=
+


−
θ
=
+
=
1
θ
=
sin
Vpk
K
T
t
OFF



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