CM6903IS CHAMP [Champion Microelectronic Corp.], CM6903IS Datasheet - Page 2

• Manufacturer Part Number: CM6903IS
• Description: Low Pin Count PFC/PWM Controller Combo
• Manufacturer: CHAMP [Champion Microelectronic Corp.]

PIN DESCRIPTION
BLOCK DIAGRAM
2002/12/16
Pin No.
VEAO
1
2
3
4
5
6
7
8
9
7
6
8
ISENSE
VFB
DC I
V
PWM OUT
PFC OUT
GND
I
VEAO
V
IAC
SENSE
CC
FB
Preliminary
Symbol
100K ohm
LIMIT
R1A
400K ohm
4K ohm
R1C
R1B
-
+
17.9V
ISENSEAMP
VCC
16.4V
2.75V
-1V
0.5V
2.5V
PWM current limit comparator input
Positive supply
PWM driver output
PFC driver output
Ground
Current sense input to the PFC current limit comparator
PFC transconductance voltage error amplifier output
PFC transconductance voltage error amplifier input
Feedforward input to do slope compensation and to start up
the system
2.5V
-
+
-
+
+
-
-
-
+
+
-
-
+
IAC
Tri-Fault
Detect
U1
gmv
VCC OVP
PFC OVP
.
PFC ILIMIT
.
SUM
+
Rev. 0.4
.
.
.
.
9
VREFOK
.
.
OUT
.
RAMP
Description
Champion Microelectronic Corporation
.
Low Pin Count PFC/PWM C
PWM CLK
1V
2.45V
PFCCLKB
PWMCLK
-
+
0.75V
.
.
VFB
OSC
10mS
PFCCMP
.
VIN OK
FAULTB
-
+
+
.
SS
.
.
DCILIMIT
1.5V
.
1
-
-
+
PWMCMP
.
VCC
PFCCLKB
PWMCLK
S
R
R
S
R
R
R
.
UVLO
Min.
CM6903
fpfc=
fpwm=
Q
Q
10
-5
Q
Q
0
0
0
0
0
0
.
GND
67KHz
67KHz
5
UVLO
Operating Voltage
VREF OK
ONTROLLER
2
VREF OK
Typ.
2.5
VCC
15
CM6903/4
CM6904
fpfc=
fpwm=134KHz
Max.
VCC
VCC
67KHz
1.5
0.7
23
6
3
1
Page 2
C
PWMOUT
PFCOUT
OMBO
Unit
V
V
V
V
V
V
V
V
4
3