ml4805 Fairchild Semiconductor, ml4805 Datasheet - Page 2

• Manufacturer Part Number: ml4805
• Description: Variable Feedforward Pfc/pwm Controller Combo
• Manufacturer: Fairchild Semiconductor

ML4805
PIN CONFIGURATION
PIN DESCRIPTION
PIN
2
1
2
3
4
5
6
7
8
NAME
IEAO
I
I
V
SS
V
R
RAMP 1
AC
SENSE
T
DC
RMS
C
T
FUNCTION
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
Connection for oscillator frequency
setting components
PFC ramp input
RAMP 1
RAMP 2
I SENSE
V RMS
R T C T
IEAO
V DC
I AC
18-Pin PDIP (P18)
18-Pin SOIC (S18)
SS
1
2
3
4
5
6
7
8
9
TOP VIEW
ML4805
18
17
16
15
14
13
12
11
10
PIN
11
12
13
14
15
16
17
18
10
9
VEAO
V FB
V REF
V CC
PFC OUT
PWM OUT
PGND
AGND
I LIM
NAME
RAMP 2
ILIM
AGND
PGND
PWM OUT PWM driver output
PFC OUT
V
V
V
VEAO
CC
FB
REF
FUNCTION
PWM ramp sense input
PWM current limit sense input
Analog ground
Power ground
PFC driver output
Positive supply (connected to an
internal shunt regulator).
Buffered output for the internal 7.5V
reference
PFC transconductance voltage error
amplifier input
PFC transconductance voltage error
amplifier output
REV. 1.1 3/9/2001