FAN4800AU Fairchild Semiconductor, FAN4800AU Datasheet - Page 3

• Manufacturer Part Number: FAN4800AU
• Description: The highly integrated FAN4800AU/CU parts are specially designed for power supplies that consist of boost PFC and PWM
• Manufacturer: Fairchild Semiconductor

© 2011 Fairchild Semiconductor Corporation
FAN4800AU/CU • Rev. 1.0.0
Application Diagrams
AC
AC
R
SENSE
C
R
RAMP
RAMP
R
SENSE
R
C
T
T
R
C
R
C
Filter
R
220nF
47nF
IEA1
IEA
T
T
FBPWM
C
R
R
SS
C
FBPWM
R
Filter
220nF
47nF
IEA1
IEA
C
C
200KΩ
FBPWM
36KΩ
C
RAMP
VIN
C
R
Filter
SS
FBPWM
C
IEA2
200KΩ
C
36KΩ
C
Vin
1MΩ
1MΩ
Filter
C
VRMS
ISENSE
RT/CT
SS
RAMP
IEA
VREF
FBPWM
IEA2
1MΩ
1MΩ
3MΩ
3MΩ
VRMS
ISENSE
IEA
VREF
RAMP
RT/CT
SS
FBPWM
IAC
R
3MΩ
3MΩ
RAMP
OPFC
IAC
10Ω
FBPFC
OPWM
L
ILIMIT
OPFC
10KΩ
Figure 2.
Figure 3.
Boost
GND
VDD
VEA
10Ω
FBPFC
OPWM
L
ILIMIT
10KΩ
Boost
GND
VDD
VEA
C
R
VEA1
VEA
C
C
V
R
Q1
C
VDD
DD
VEA1
VEA
Filter
D
3
C
Boost
C
V
C
C
Q1
C
VDD
VEA2
DD
FBPFC
Bulk
Filter
Current Mode
Voltage Mode
R
D
Filter
C
Boost
C
C
VEA2
FBPFC
Bulk
R
Filter
10Ω
10Ω
10KΩ
10KΩ
R
R
R
FBPFC1
FBPFC2
FBPFC3
10Ω
10Ω
R
ILIMIT
10KΩ
10KΩ
D
R
R
R
F2
FBPFC1
FBPFC2
FBPFC3
R
ILIMIT
Q2
Q3
D
F2
L
D
FBPWM
Q2
Q3
m
F1
L
D
FBPWM
1nF
m
F1
1nF
R
C
D
FB
R
FB4
R
C
D
FB
R
FB4
R
R
FB3
FB1
12V
R
FB2
www.fairchildsemi.com
R
R
FB3
FB1
12V
R
FB2
12V
5V
5V
12V
5V
5V