FAN4800I Fairchild Semiconductor, FAN4800I Datasheet - Page 3

• Manufacturer Part Number: FAN4800I
• Description: The FAN4800 is a controller for power-factor-corrected, switched-mode power supplies
• Manufacturer: Fairchild Semiconductor

FAN4800 Rev. 1.0.6
© 2005 Fairchild Semiconductor Corporation
Pin Configuration
Pin Definitions
Pin #
10
12
13
14
15
16
11
1
2
3
4
5
6
7
8
9
RAMP2 (PWM RAMP)
RAMP1 (RtCt)
PWM OUT
PFC OUT
DC I
Name
I
SENSE
V
V
GND
V
I
V
V
V
EAO
I
SS
RMS
EAO
REF
AC
DC
CC
FB
LIMIT
Figure 2. Pin Configuration (Top View)
PFC transconductance current error amplifier output
PFC gain control reference input
Current sense input to the PFC current limit comparator
Input for PFC RMS line voltage compensation
Connection point for the PWM soft-start capacitor
PWM voltage feedback input
Oscillator timing node; timing set by RT, CT
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).
PWM current-limit comparator input
Ground
PWM driver output
PFC driver output
Positive supply
Buffered output for the internal 7.5V reference
PFC transconductance voltage error amplifier input
PFC transconductance voltage error amplifier output
1
2
3
4
5
6
7
8
I
I
I
V
SS
V
RAMP1
RAMP2
EAO
AC
SENSE
RMS
DC
3
PWM OUT
PFC OUT
DC I
FAN4800 Rev.03
GND
V
V
V
LIMIT
V
EAO
REF
CC
FB
Description
16
15
14
13
12
11
10
9
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