CM6903/4
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
2002/12/16
Preliminary
Rev. 0.4
Champion Microelectronic Corporation
Page 1
GENERAL DESCRIPTION
FEATURES
! Patent Number #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
!
Pin to pin compatible with FAN6903/4
!
Enable lowest BOM for power supply with PFC
!
Internally synchronized PFC and PWM in one IC
!
Patented slew rate enhanced voltage error amplifier with
advanced input current shaping technique
!
Universal Line Input Voltage
!
CCM boost or DCM boost with leading edge modulation
PFC using Input Current Shaping Technique
!
Feedforward IAC pin to do the automatic slope
compensation
!
PFCOVP, PFC VCCOVP, Precision -1V PFC ILIMIT,
Tri-Fault Detect comparator to meet UL1950
!
No bleed resistor required
!
Low supply currents; start-up: 100uA typical, operating
current: 2mA typical.
!
Synchronized leading PFC and trailing edge modulation
PWM to reduce ripple current in the storage capacitor
between the PFC and PWM sections and to reduce
switching noise in the system
!
VINOK Comparator to guarantee to enable PWM when
PFC reach steady state
!
High efficiency trailing-edge current mode PWM
!
UVLO, REFOK, and brownout protection
!
Digital PWM softstart: CM6903 (10ms), CM6904 (5ms)
!
Precision PWM 1.5V current limit for current mode
operation
The CM6903/4 is a space-saving PFC-PWM controller for
power factor corrected, switched mode power supplies that
offers very low start-up and operating currents. For the
power supply less than 500Watt, its input current shaping
PFC performance could be very close to CM6800 or
ML4800 architecture.
Power Factor Correction (PFC) offers the use of smaller,
lower cost bulk capacitors, reduces power line loading and
stress on the switching FETs, and results in a power supply
fully compliant to IEC1000-3-2 specifications. The
CM6903/4 includes circuits for the implementation of a
leading edge, input current shaping technique "boost" type
PFC and a trailing edge, PWM.
The CM6903's PFC and PWM operate at the same
frequency, 67kHz. The PFC frequency of the CM6904 is
automatically set at half that of the 134kHz PWM. This
higher frequency allows the user to design with smaller
PWM components while maintaining the optimum operating
frequency for the PFC. An PFC OVP comparator shuts
down the PFC section in the event of a sudden decrease in
load. The PFC section also includes peak current limiting
for enhanced system reliability.
24 Hours Technical Support---WebSIM
Champion provides customers an online circuit simulation tool
called WebSIM. You could simply logon our website at
www.champion-micro.com for details.
APPLICATIONS
PIN CONFIGURATION
!
Desktop PC Power Supply
!
AC Adaptor
!
Internet Server Power Supply
!
IPC Power Supply
!
UPS
!
Battery Charger
!
DC Motor Power Supply
!
Monitor Power Supply
!
Telecom System Power Supply
!
Distributed Power
SIP-09 (Z09)
Front View
D
C
IL
IM
IT
VC
C
PW
MO
U
T
PF
C
O
U
T
GN
D
IS
E
N
S
E
VEA
O
VF
B
IA
C
1
2
3
4
5
6
7
8
9
SOP-16 (S16)
Top View
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
PFCOUT
GND
GND
I
SEN SE
VEAO
V
FB
I
AC
NC
NC
NC
PWMOUT
NC
V
CC
NC
DC I
LIMIT
NC
CM6903/4
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
2002/12/16
Preliminary
Rev. 0.4
Champion Microelectronic Corporation
Page 2
PIN DESCRIPTION
Operating Voltage
Pin No.
Symbol
Description
Min. Typ. Max.
Unit
1 DC
I
LIMIT
PWM current limit comparator input
0
1.5
V
2 V
CC
Positive
supply
10 15 23 V
3
PWM OUT
PWM driver output
0
VCC
V
4
PFC OUT
PFC driver output
0
VCC
V
5
GND Ground
6 I
SENSE
Current sense input to the PFC current limit comparator
-5
0.7
V
7 VEAO
PFC transconductance voltage error amplifier output
0 6
V
8 V
FB
PFC transconductance voltage error amplifier input
0
2.5
3
V
9
IAC
Feedforward input to do slope compensation and to start up
the system
0 1
V
BLOCK DIAGRAM
2.75V
1.5V
VCC OVP
+
-
.
-
67KHz
-
+
.
fpwm=
1V
9
IAC
PWMCMP
-
.
-
+
CM6903
VREF OK
1
DCILIMIT
Tri-Fault
Detect
+
+
OUT
U1
SUM
.
.
.
.
0.75V
4
PFCOUT
VREFOK
PWMCLK
VCC
VIN OK
+
-
.
+
UVLO
.
.
RAMP
PFCCMP
+
-
.
PWM CLK
gmv
VFB
PFCCLKB
PWMCLK
.
.
VREF OK
8
VFB
2.5V
+
-
6
ISENSE
0.5V
fpwm=134KHz
R1B
3
PWMOUT
2.45V
2.5V
fpfc=
16.4V
UVLO
10mS
.
.
.
100K ohm
400K ohm
4K ohm
7
VEAO
FAULTB
CM6904
PFC ILIMIT
+
-
.
17.9V
67KHz
OSC
VCC
S
R
Q
Q
R
R1A
5
GND
S
R
Q
Q
R
R
R1C
67KHz
2
VCC
PFC OVP
+
-
.
-
fpfc=
SS
+
-
.
PFCCLKB
.
.
-1V
ISENSEAMP
CM6903/4
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
2002/12/16
Preliminary
Rev. 0.4
Champion Microelectronic Corporation
Page 3
ORDERING INFORMATION
Part Number
Temperature Range
Package
CM6903IZ
-40 to 125
9-Pin SIP (Z09)
CM6903IS
-40 to 125
16-Pin SOP (S16)
CM6904IZ
-40 to 125
9-Pin SIP (Z09)
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter Min.
Max.
Units
V
CC
MAX
23
V
IAC (after start up)
GND-0.3
1.0
V
I
SENSE
Voltage
-5
0.7
V
PFC OUT
GND 0.3
VCC + 0.3
V
PWM OUT
GND 0.3
VCC + 0.3
V
VEAO
0 6.3 V
Voltage on Any Other Pin
GND 0.3
VREF + 0.3
V
I
CC
Current (Average)
40
mA
Peak PFC OUT Current, Source or Sink
0.5
A
Peak PWM OUT Current, Source or Sink
0.5
A
PFC OUT, PWM OUT Energy Per Cycle
1.5
J
Junction Temperature
150
Storage Temperature Range
-65
150
Operating Temperature Range
-40
125
Lead Temperature (Soldering, 10 sec)
260
Thermal Resistance (
JA
)
80
/W
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply Vcc=+15V,
T
A
=Operating Temperature Range (Note 1)
CM6903/4
Symbol Parameter
Test
Conditions
Min. Typ. Max.
Unit
Voltage Error Amplifier (g
mv
)
Input Voltage Range
0
5
V
Transconductance
V
NONINV
= V
INV
, VEAO = 3.75V
30
65
90
mho
Feedback Reference Voltage
2.45
2.5
2.55
V
Input Bias Current
Note 2
-0.5
-1.0
A
Output High Voltage
5.8
6.0
V
Output Low Voltage
0.1
0.4
V
Sink
Current
V
FB
= 3V, VEAO = 6V
-20
-35
A
Source
Current
V
FB
= 1.5V, VEAO = 1.5V
30
40
A
Open Loop Gain
50
60
dB
Power Supply Rejection Ratio
11V < V
CC
< 16.5V
50
60
dB
IAC
Input Impedance
ISENSE = 0V
850
1000
1150
Ohm
VCC OVP Comparator
Threshold
Voltage
17.4 17.9 18.4 V
Hysteresis
1.4 1.5 1.65 V
CM6903/4
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
2002/12/16
Preliminary
Rev. 0.4
Champion Microelectronic Corporation
Page 4
ELECTRICAL CHARACTERISTICS
(Conti.) Unless otherwise stated, these specifications apply
Vcc=+15V, R
T
= 52.3k, C
T
= 470pF, T
A
=Operating Temperature Range (Note 1)
CM6903/4
Symbol Parameter
Test
Conditions
Min. Typ. Max.
Unit
PFC OVP Comparator
Threshold
Voltage
2.70 2.77 2.85 V
Hysteresis
230 290
mV
PFC I
LIMIT
Comparator
Threshold
Voltage
-0.9 -1 -1.15 V
Delay to Output
150
300
ns
V
IN
OK Comparator
Threshold
Voltage
2.35 2.45 2.55 V
Hysteresis
1.65 1.75 1.85 V
PWM Digital Soft Start
Right After Start Up (CM6903)
10
ms
Digital Soft Start Timer (Note 2)
Right After Start Up (CM6904)
5
ms
DC I
LIMIT
Comparator
Threshold
Voltage
1.4 1.5 1.6 V
Delay to Output (Note 2)
150
300
ns
Tri-Fault Detect Comparator
Fault Detect HIGH
2.65
2.75
2.85
V
Time to Fault Detect HIGH
V
FB
=V
FAULT DETECT LOW
to V
FB
= OPEN,
470pF from V
FB
to GND
2 4
ms
Fault Detect LOW
0.4
0.5
0.6
V
Oscillator
Initial
Accuracy
T
A
= 25
62 67 74 kHz
Voltage Stability
10V < V
CC
<
15V
1 %
Temperature
Stability
2 %
Total Variation
Line, Temp
60
67
74.5
kHz
PFC Dead Time (Note 2)
0.3
0.45
0.65
s
PFC
Minimum Duty Cycle
I
AC
=100uA,V
FB
=2.55V, I
SENSE
= 0V
0
%
Maximum Duty Cycle
I
AC
=0uA,V
FB
=2.0V, I
SENSE
= 0V
90
95
%
Output Low Impedance
8
15
ohm
I
OUT
= -100mA
0.8
1.5
V
Output Low Voltage
I
OUT
= -10mA, V
CC
= 8V
0.4
0.8
V
Output High Impendence
8
15
ohm
Output High Voltage
I
OUT
= 100mA, V
CC
= 15V
13.5
14.2
V
Rise/Fall Time (Note 2)
C
L
= 1000pF
50
ns
CM6903/4
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
2002/12/16
Preliminary
Rev. 0.4
Champion Microelectronic Corporation
Page 5
ELECTRICAL CHARACTERISTICS
(Conti.) Unless otherwise stated, these specifications apply
Vcc=+15V, R
T
= 52.3k, C
T
= 470pF, T
A
=Operating Temperature Range (Note 1)
CM6903/4
Symbol Parameter
Test
Conditions
Min. Typ. Max.
Unit
PWM
CM6903
0-49.5
0-50
%
Duty Cycle Range
CM6904 0-49.5
0-50
%
Output Low Impedance
8
15
ohm
I
OUT
= -100mA
0.8
1.5
V
Output Low Voltage
I
OUT
= -10mA, V
CC
= 8V
0.7
1.5
V
Output High Impendence
8
15
ohm
Output High Voltage
I
OUT
= 100mA, V
CC
= 15V
13.5
14.2
V
Rise/Fall Time (Note 2)
C
L
= 1000pF
50
ns
Supply
Start-Up
Current
V
CC
= 11V, C
L
= 0
100
150
uA
Operating
Current
V
CC
= 15V, C
L
= 0
2.5
4.0
mA
Undervoltage Lockout Threshold
14.7
15
15.3
V
Undervoltage Lockout Hysteresis
4.85
5
5.15
V
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
Note 2: Guaranteed by design, not 100% production test.
TYPICAL PERFORMANCE CHARACTERISTIC
57
64
71
78
85
92
99
106
113
120
127
2
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
3
VFB (V)
Transconductance (umho)
Voltage Error Amplifier (g
mv
) Transconductance
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