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FAN4800 Datasheet(PDF) 3 Page - Fairchild Semiconductor

Part # FAN4800
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

FAN4800 Datasheet(HTML) 3 Page - Fairchild Semiconductor

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© 2005 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN4800 Rev. 1.0.5
3
Pin Configuration
Figure 2. Pin Configuration (Top View)
Pin Definitions
Pin #
Name
Description
1
IEAO
PFC transconductance current error amplifier output
2
IAC
PFC gain control reference input
3
ISENSE
Current sense input to the PFC current limit comparator
4
VRMS
Input for PFC RMS line voltage compensation
5
SS
Connection point for the PWM soft-start capacitor
6
VDC
PWM voltage feedback input
7
RAMP1
(RtCt)
Oscillator timing node; timing set by RT, CT
8
RAMP2
(PWM RAMP)
In current mode, this pin functions as the current sense input; in voltage mode,
it is the PWM input from the PFC output (feed forward ramp)
9
DC ILIMIT
PWM current limit comparator input
10
GND
Ground
11
PWM OUT
PWM driver output
12
PFC OUT
PFC driver output
13
VCC
Positive supply
14
VREF
Buffered output for the internal 7.5V reference
15
VFB
PFC transconductance voltage error amplifier input
16
VEAO
PFC transconductance voltage error amplifier output
1
2
13
12
16
14
4
5
I
SENSE
SS
V
RMS
I
EAO
V
EAO
V
CC
GND
3
I
AC
15
6
7
11
10
RAMP1
9
8RAMP2
DC I
LIMIT
PWM OUT
PFC OUT
V
REF
V
FB
FAN4800 Rev.03
V
DC


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