CM6903IS CHAMP [Champion Microelectronic Corp.], CM6903IS Datasheet - Page 12

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

APPLICATION CIRCUIT (CM6903/4)
2002/12/16
D15
D16
RFIlter
CFilter
R21
C8
C9
VEAO
AC IN
7
6
8
ISENSE
VFB
Preliminary
F1
100K ohm
R1A
C1
Z1
400K ohm
4K ohm
R1C
R1B
-
+
17.9V
ISENSEAMP
VCC
16.4V
2.75V
-1V
0.5V
2.5V
D8
2.5V
R5
-
+
-
+
D10
+
+
-
-
-
+
+
-
-
Rev. 0.4
IAC
Tri-Fault
Detect
U1
gmv
VCC OVP
PFC OVP
PFC ILIMIT
.
RAC
R23
.
.
SUM
+
.
.
.
9
R22
VREFOK
.
.
Q4
L1
OUT
D14
Q1
R4
D1
D2
.
C4
RAMP
Champion Microelectronic Corporation
Low Pin Count PFC/PWM C
C5
.
R7
R2
C9
R20
PWM CLK
T2
R8
1V
2.5V
C10
PFCCLKB
PWMCLK
-
+
.
.
VFB
1.5V
OSC
10mS
D6
PFCCMP
D7
C11
R12
.
FAULTB
VIN OK
R10
-
+
+
.
.
.
SS
DCILIMIT
R9
R19
1.5V
PWMCLK
.
Q3
R11
1
-
-
+
Q2
D5
PWMCMP
C16
.
T1
D12
VCC
D13
PFCCLKB
S
R
R
S
S
R
R
R
R
R
L2
.
C17
UVLO
CM6903
fpfc=
fpwm=
Q
Q
Q
Q
Q
Q
D11
GND
.
C18
C19
67KHz
67KHz
D9
5
UVLO
2
VREF OK
C13
VCC
VREF OK
U2
R13
C14
ONTROLLER
SR1
R16
R14
C15
CM6904
fpfc=
fpwm=
C21
R17
R15
C7
CM6903/4
R3
67KHz
VOUT
134KHz
VCC_CIRCLE
C8
PWMOUT
Page 12
D3
PFCOUT
C
4
3
T1
OMBO
D8
D10