Datasheet

© 2010 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN4800AS/CS/01S/02S • Rev. 1.0.2 4
FAN4800AS/CS/01S/02S — PFC/PWM Controller Combination
Block Diagram
2.5V
gmv
15FBPFC
Gain
Modulator
IAC
VRMS
0.3V
Low Power
Detect Comparator
Rmul
Rmul
ISENSE
gmi
OSCILLATOR
-1.15V
PFC ILIMIT
PFC OVP
VDD OVP
PFC UVP
2.5V/2.75V
27V/28V
0.5V
Q
Q
SET
CLR
S
R
Q
Q
SET
CLR
S
R
V
DD
RT/CT
VEA IEA
7.5V
REFERENCE
VDD
VREF
DUTY CYCLE
LIMIT
V
IN
OK
1.15V/2.4V
300
1.5V
FBPFC
1V
300
Q
Q
SET
CLR
S
R
UVLO
V
DD
1
16
2
3
4
13
14
12
OPFC
7
8
6
5
9
ILIMIT
SS
FBPWM
RAMP
11
OPWM
10µA
V
DD
V
REF
VRMS
1.05V/1.9V
AC UVP
10GND
V
GATE-CLAMP
V
GATE-CLAMP
Figure 3. FAN4800AS/CS Function Block Diagram
2.5V
gmv
15FBPFC
Gain
Modulator
IAC
VRMS
0.3V
Low Power
Detect Comparator
Rmul
Rmul
ISENSE
gmi
OSCILLATOR
-1.15V
PFC ILIMIT
PFC OVP
VDD OVP
PFC UVP
2.5V/2.75V
27V/28V
0.5V
Q
Q
SET
CLR
S
R
Q
Q
SET
CLR
S
R
V
DD
RT/CT
VEA IEA
7.5V
REFERENCE
VDD
VREF
DUTY CYCLE
LIMIT
V
IN
OK
1.15V/2.4V
300
1.5V
FBPFC
1V
300
Q
Q
SET
CLR
S
R
UVLO
V
DD
Range
1
16
2
3
4
13
14
12
OPFC
7
8
6
5
9
ILIMIT
SS
FBPWM
RAMP
11
OPWM
10µA
V
DD
V
REF
VRMS
1.05V/1.9V
AC UVP
10GND
V
GATE-CLAMP
V
GATE-CLAMP
Figure 4. FAN4801S/02S Function Block Diagram