?2006 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN7529 Rev. 1.0.2
2
Typical Application Diagrams
Figure 1. Typical Boost PFC Application
Internal Block Diagram
Figure 2. Functional Block Diagram of FAN7529
GND
ZCD
INV
V
CC
AC
IN
V
O
COMP
FAN7529
CS
MOT
R1
R2
L
D
C
O
N
AUX
V
AUX
R
ZCD
FAN7529 Rev. 00
INV
Error
Amplifier
V
ref1
OVP
COMP
8pF
40k
2.5V
Ref
Internal
Bias
Timer
V
CC
ZCD
CS
UVLO
6.7V
12V 8.5V
2.675V
2.5V
Current Protection
Comparator
1V Offset
MOT
GND
Saw Tooth
Generator
Zero Current
Detector
R
S
Q
3
6
4
5
2
1
8
V
ref1
Gm
0.8V
Disable
0.45V 0.35V
Disable
1.5V
1.4V
7
V
CC
OUT
Drive
Output
Ramp
Signal
1V~5V
Range
2.9V
FAN7529 Rev. 00