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FAN4800IMX Datasheet(PDF) 2 Page - Fairchild Semiconductor

Part # FAN4800IMX
Description  Low Start-Up Current PFC/PWM Controller Combos
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN4800IMX Datasheet(HTML) 2 Page - Fairchild Semiconductor

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© 2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN4800 Rev. 1.0.5
2
Block Diagram
Figure 1. Internal Block Diagram
RAMP2
V
FB
V
REF
RAMP1
20
μA
OSCILLATOR
2.25V
4
3
15
DUTY CYCLE
LIMIT
2
POWER FACTOR CORRECTOR
8
GAIN
MODULATOR
V
FB
7.5V
REFERENCE
7
S
R
Q
S
R
Q
I
EAO
V
EAO
PFC OUT
S
R
Q
UVLO
SS
DC I
LIMIT
PWM OUT
V
CC
PULSE WIDTH MODULATOR
V
CC
0.9V
2.78V
-1V
GND
6
5
9
10
11
12
14
0.3V
Low Power
Detector
V
CC
TRI-FAULT
V
CC OVP
350
PWM CMP
SS CMP
S
R
Q
PFC OVP
PFC CMP
PWM DUTY
350
CLK
PFC
OUT
PWM
OUT
13
1
16
3.5k
3.5k
2.5V
I
AC
I
SENSE
V
RMS
V
DC
0.5V
17.9V
V
IN OK
1.0V
DC I
LIMIT
PFC I
LIMIT
V
CC
V
REF
FAN4800 Rev.02


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