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FQA13N50C bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor

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© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.0 • 8/26/09
AN-8027
FAN480X PFC+PWM Combination Controller Application
FAN4800A / FAN4800C / FAN4801 / FAN4802 / FAN4802L
Introduction
This application note describes step-by-step design
considerations for a power supply using the FAN480X
controller. The FAN480X combines a PFC controller and
a PWM controller. The PFC controller employs average
current mode control for Continuous Conduction Mode
(CCM) boost converter in the front end. The PWM
controller can be used in either current mode or voltage
mode for the downstream converter. In voltage mode,
feed-forward from the PFC output bus can be used to
improve the line transient response of PWM stage. In
either mode, the PWM stage uses conventional trailing-
edge duty cycle modulation, while the PFC uses leading-
edge modulation. This proprietary leading/trailing-edge
modulation technique can significantly reduce the ripple
current of the PFC output capacitor.
The synchronization of the PWM with the PFC simplifies
the PWM compensation due to the controlled ripple on the
PFC output capacitor (the PWM input capacitor). In
addition to power factor correction, a number of protection
features have been built in to the FAN480X. These include
programmable soft-start, PFC over-voltage protection,
pulse-by-pulse current limiting, brownout protection, and
under-voltage lockout.
FAN4801/2/2L feature programmable two-level PFC
output to improve efficiency at light-load and low-line
conditions.
FAN480X is pin-to-pin compatible with FAN4800 and
ML4800, only requiring adjustment of some peripheral
components. The FAN480X series comparison is
summarized in the Appendix A.
D
BOOST
L BOOST
Q1
C
BOOST
R
CS1
C
IF1
F1
IEA
RAMP
RT/CT
FBPWM
SS
VRMS
ISENSE
IAC
ILIMIT
GND
OPWM
OPFC
VD
D
VREF
FBPFC
VEA
R
FB2
RFB1
Q2
Q3
D
R1
L 1
1
L 2
1
C
O11
L 1
2
L22
Vo
1
Vo2
V D
D
AC
Input
RRAMP
FAN480X
Drv
R IAC
Drv
Drv
C
O12
C
O21
C
O22
D
F1
D
F2
D
R2
V
BOUT
C
FB
C
REF
C
DD
C
LF2
R
LF2
R
CS2
D
R1
D
R2
R
RMS2
C
RMS1
C
RMS2
C
LF1
C
SS
C
T
C
RAMP
R
T
R
IC
C
IC1
C
IC2
D1
D2
R
RMS1
R
RMS3
R
B
C
VC2
C
VC1
R
VC
C
B
Vo1
Vo2
R
D
R
BIAS
R
OS1
R
OS2
R
OS3
R
F
C
F
R
LF1
Figure 1. Typical Application Circuit of FAN480X


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