CM6903A
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
GENERAL DESCRIPTION
The CM6903A 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
CM6903A includes circuits for the implementation of a
leading edge, input current shaping technique “boost” type
PFC and a trailing edge, PWM.
The CM6903A’s PFC and PWM operate at the same
frequency, 67kHz. 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.
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: CM6903A (10ms)
Precision PWM 1.5V current limit for current mode
operation
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
Desktop PC Power Supply
AC Adaptor
Internet Server Power Supply
PIN CONFIGURATION
SIP-09 (Z09)
Front View
DC ILIMIT
PFCOUT
ISENSE
VEAO
IPC Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
PW MOUT
GND
VCC
VFB
1
2
3
4
5
6
7
8
2005/01/20
Champion Microelectronic Corporation
IAC
9
Page 1
CM6903A
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
ORDERING INFORMATION
Part Number
CM6903AIZ
CM6903AGIZ*
*Note: G : Suffix for Pb Free Product
Temperature Range
-40℃ to 125℃
-40℃ to 125℃
Package
9-Pin SIP (Z09)
9-Pin SIP (Z09)
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter
V
CC
MAX
IAC (after start up)
I
SENSE
Voltage
PFC OUT
PWM OUT
VEAO
Voltage on Any Other Pin
I
CC
Current (Average)
Peak PFC OUT Current, Source or Sink
Peak PWM OUT Current, Source or Sink
PFC OUT, PWM OUT Energy Per Cycle
Junction Temperature
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (θ
JA
)
Min.
GND-0.3
-5
GND – 0.3
GND – 0.3
0
GND – 0.3
Max.
20
1.0
0.7
VCC + 0.3
VCC + 0.3
6.3
VCC + 0.3
40
0.5
0.5
1.5
150
150
125
260
80
Units
V
V
V
V
V
V
V
mA
A
A
µJ
℃
℃
℃
℃
℃/W
-65
-40
ELECTRICAL CHARACTERISTICS
T
A
=Operating Temperature Range (Note 1)
Symbol
Parameter
Unless otherwise stated, these specifications apply Vcc=+15V,
Test Conditions
Voltage Error Amplifier (g
mv
)
CM6903A
Min.
0
Typ.
Max.
5
65
2.5
-0.5
5.8
6.0
0.1
0.4
-35
40
60
60
5100
17.9
1.5
6120
18.4
1.65
90
2.55
-1.0
Unit
Input Voltage Range
Transconductance
Feedback Reference Voltage
Input Bias Current
Output High Voltage
Output Low Voltage
Sink Current
Source Current
Open Loop Gain
Power Supply Rejection Ratio
Input Impedance
Threshold Voltage
Hysteresis
11V < V
CC
< 16.5V
IAC
ISENSE = 0V
VCC OVP Comparator
V
FB
= 3V, VEAO = 6V
V
FB
= 1.5V, VEAO = 1.5V
Note 2
V
NONINV
= V
INV
, VEAO = 3.75V
V
µmho
V
µA
V
V
µA
µA
dB
dB
Ohm
V
V
30
2.45
-20
30
50
50
4080
17.4
1.2
2005/01/20
Champion Microelectronic Corporation
Page 3
CM6903A
Low Pin Count PFC/PWM C
ONTROLLER
C
OMBO
ELECTRICAL CHARACTERISTICS
(Conti.) Unless otherwise stated, these specifications apply
Vcc=+15V, R
T
= 52.3kΩ, C
T
= 470pF, T
A
=Operating Temperature Range (Note 1)
Symbol
Parameter
Test Conditions
PWM
Duty Cycle Range
Output Low Impedance
Output Low Voltage
Output High Impendence
Output High Voltage
Rise/Fall Time (Note 2)
Start-Up Current
Operating Current
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
Note 2: Guaranteed by design, not 100% production test.
I
OUT
= 100mA, V
CC
= 15V
C
L
= 1000pF
Supply
V
CC
= 11V, C
L
= 0
V
CC
= 15V, C
L
= 0
12.74
2.85
100
2.5
13.0
3.0
150
4.0
13.26
3.15
uA
mA
V
V
13.5
I
OUT
= -100mA
I
OUT
= -10mA, V
CC
= 8V
CM6903A
0-49.5
15
0.8
0.7
30
14.2
50
0-50
22.5
1.5
1.5
45
%
ohm
V
V
ohm
V
ns
CM6903A
Min.
Typ.
Max.
Unit
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
TYPICAL PERFORMANCE CHARACTERISTIC
127
120
Transconductance (umho)
113
106
99
92
85
78
71
64
57
2
2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9
VFB (V)
3
Voltage Error Amplifier (g
mv
) Transconductance
2005/01/20
Champion Microelectronic Corporation
Page 5
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