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AN4149 Arkusz danych(PDF) 6 Page - STMicroelectronics

Numer części AN4149
Szczegółowy opis  Designing a CCM PFC pre-regulator based on the L4984D
PDF  43 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4149 Arkusz danych(HTML) 6 Page - STMicroelectronics

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CCM PFC using FOT control
AN4149
6/43
DocID023523 Rev 2
Figure 4. Line-modulated FOT modulator internal block diagram
Figure 5. Line-modulated FOT modulator key waveforms
With reference to the block diagram (Figure 4) and the relevant key waveforms in Figure 5,
an OFF-time proportional to the instantaneous line voltage is achieved by charging the
capacitor CT with a constant current ITIMER, accurately fixed internally and temperature
compensated, while the MOSFET is off and commanding MOSFET's turn-on (and resetting
CT at zero) as the voltage across CT equals that on the pin MULT. The voltage on this pin is:
Equation 5
where KP is the divider ratio of the resistors biasing pin MULT. As a result:
Equation 6
AM13303v1
MULT
-
+
C T
I
Timer
OFF
ON
0
TIMER
Q
S
R
+
-
PWM
Comparator
Driver
PWM Latch
GD
CS
COMP
Multiplier
MULT
-
+
C T
I
Timer
OFF
ON
0
TIMER
Q
S
R
+
-
PWM
Comparator
Driver
PWM Latch
GD
CS
COMP
Multiplier
MULT
-
+
C T
C T
I
Timer
I
Timer
OFF
ON
0
TIMER
Q
S
R
+
-
PWM
Comparator
Driver
PWM Latch
GD
CS
COMP
Multiplier
AM13304v1
GD
CS
S
R
Q
TOFF
TON
Multiplier output
MULT
TIMER
t
t
t
t
t
t
GD
CS
S
R
Q
TOFF
TON
Multiplier output
MULT
TIMER
t
t
t
t
t
t
GD
CS
S
R
Q
TOFF
TON
Multiplier output
MULT
TIMER
t
t
t
t
t
t
θ
=
sin
Vpk
K
V
P
MULT
P
TIMER
T
t
P
TIMER
T
OFF
K
I
C
K
sin
Vpk
K
I
C
T
=
→
θ
=



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