FAN7528 Просмотр технического описания (PDF) - Fairchild Semiconductor
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FAN7528 Datasheet PDF : 21 Pages
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Typical Application Diagrams
L
D
VO
AC IN
VAUX NAUX
R2 RZCD
ZCD
CO
VCC
FAN7528
INV
MOT
CS
COMP
R1
GND
FAN7528 Rev. 1.01
Figure 1. Typical Boost PFC Application
Internal Block Diagram
VCC 8
UVLO
12V 8.5V
Disable
ZCD 5
6.7V
1.4V 1.5V
Zero Current
Detector
2.5V
Ref
Vref
Internal
Bias
160μs
Timer
S
Q
R
Vcc
Drive
Output
7 OUT
13V
OVP
2.66V 2.55V
CS 4
MOT 3
40k
8pF
0.8V
Ramp
Signal
Sawtooth
Generator
OCP
Comparator
1V Offset
6
GND
Error
Amplifier
Gm
1V ~ 5V
Range
2
COMP
Disable
0.45V 0.35V
VCC=8.5V Reference Set
VCC=4.5V Reference Reset
Dual-Output Reference
Generator
1.5V/2.5V
1 INV
FAN7528 Rev. 1.00
Figure 2. Functional Block Diagram of FAN7528
© 2005 Fairchild Semiconductor Corporation
FAN7528 Rev. 1.0.6
2
www.fairchildsemi.com
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