CM6903A Datasheet, PDF (12/14 Pages) Champion Microelectronic Corp. – Low Pin Count PFC/PWM CONTROLLER COMBO

CM6903A
Low Pin Count PFC/PWM CONTROLLER COMBO
APPLICATION CIRCUIT (CM6903A)
AC IN
F1
VOUT
Z1
C1
R5
RAC
D1
L1
D2
C4
Q1
R4
R7 C9
R2 R20
T2
C5
R8
R9
C10
R12
D7
D12
L2
Q2
D13
C17
D5
T1
Q3
R10
C16
C19
C18
R13
U2
R14
R17
C21
R16
SR1
R15
VCC_CIRCLE
R22
D8
D10
Q4
D14
R23
D6
C11
R19
R11
R3
D3
T1
D11
D9
C13
C14
C15
C7
C8
RFIlter
D15
CFilter
D16
ISENSE
6
R1A
100K ohm
VFB
8
7
VEAO
R21
C8
C9
R1C
9
IAC
VREFOK
5.1K ohm
R1B
400K ohm
+
U1
+
.
ISENSEAMP
SUM
OUT
.
gmv
-
.
2.5V
+
VCC
17.9V
16.4V
0.5V
2.75V
2.5V
-1V
VCC OVP
+
.
-
-
Tri-Fault
Detect
-
.
+
PFC OVP
+
.
-
-
-
.
+
PFC ILIMIT
2
VCC
RAMP
.
.
-
.
+
PFCCMP
FAULTB
S
Q
R
R
Q
VREF OK
UVLO
VCC
.
.
UVLO
OSC
PFCCLKB
PWMCLK
.
.
PWMCLK
VFB
2.5V
1.5V
VIN OK
-
.
+
+
1.5V
PWM CLK
10mS
.
SS
.
.
1V
-
-
.
+
PWMCMP
PFCCLKB
S
Q
R
R
R
Q
VREF OK
CM6903A
fpfc= 67KHz
fpwm=67KHz
1
DCILIMIT
5
GND
4
PFCOUT
D8
3
PWMOUT
D10
2005/01/20
Champion Microelectronic Corporation
Page 12