CM6802
N
O
B
LEED
R
ESISTOR
G
REEN
M
ODE
PFC/PWM C
ONTROLLER
C
OMBO
GENERAL DESCRIPTION
The CM6802 is a green PFC/PWM. It is the new generation
of ML4802, ML4841, ML4801 and ML4824-2. Its system
clock frequency is generated by the external RT and CT,
and then its PWM frequency is 50% of the clock and its
PFC frequency is 25% of the clock. CM6802 is designed to
be pin-pin compatible with CM6800 family, ML4800 family
and ML4824 family. Its PWM (DC to DC section) can be
easily configured to Voltage Mode or Current Mode.
The
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green mode function can easily be designed so during the
no load condition, its input power can be less than 0.75Watt
without shutting off PFC. Its PFC green mode threshold and
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the PWM green mode threshold can separately set by
selecting the proper the RC filter at ISENSE pin (pin3) and
CT on RAMP 1 pin (pin 7). Power Factor Correction (PFC)
allows the use of smaller, lower cost bulk capacitors,
reduces power line loading and stress on the switching
FETs, and results in a power supply that fully compiles with
IEC-1000-3-2 specifications. Intended as a BiCMOS
version of the industry-standard CM6800, CM6802 includes
circuits for the implementation of leading edge, average
current, “boost” type power factor correction and a trailing
edge, pulse width modulator (PWM). Both PFC and PWM
Gate-driver with 0.5A capabilities minimizes the need for
external driver circuits. Low power requirements improve
efficiency and reduce component costs.
An over-voltage comparator shuts down the PFC section in
the event of a sudden decrease in load. The PFC section
also includes peak current limiting and input voltage
brownout protection. The PWM section can be operated in
current or voltage mode, at up to 250kHz, and includes an
accurate 50% duty cycle limit to prevent transformer
saturation.
When RAMP1 is 280KHz, fpfc is 70KHz and fpwm is
140KHz.
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FEATURES
!
Patent Number #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
fosc=2 x fpwm =4 x fpfc
No bleed resistor required
Before the chip wakes up, IAC can start up VCC
Pin to pin Compatible with CM6800, ML4824 and ML4800
(It needs to modify the values of the external component to
work properly).
User Program PFC automatic green mode threshold
(patented)
User Program PWM automatic green mode threshold
(patented)
Input power less than 0.75Watt without shutting off PFC at
no load condition.
Additional folded-back current limit for PWM section.
23V Bi-CMOS process
PWM pulse keeping for the green mode
VIN OK guaranteed turn on PWM at 2.5V instead of 1.5V
Internally synchronized leading edge PFC and trailing edge
PWM in one IC
Slew rate enhanced transconductance error amplifier for
ultra-fast PFC response
Low start-up current (30µA typ.)
Low operating current (3.0mA type.)
Low total harmonic distortion, high PF
Reduces ripple current in the storage capacitor between the
PFC and PWM sections
Average current, continuous or discontinuous boost leading
edge PFC
VCC OVP Comparator will turn off both PFC and PWM
Low Power Detect Comparator
Tri-Fault detect to meet UL1950
PWM configurable for current mode or voltage mode
operation
Current fed gain modulator for improved noise immunity
Brown-out control, over-voltage protection, UVLO, and soft
start, and Reference OK
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.
2003/06/25
Preliminary
Champion Microelectronic Corporation
Page 1
CM6802
N
O
B
LEED
R
ESISTOR
G
REEN
M
ODE
PFC/PWM C
ONTROLLER
C
OMBO
APPLICATIONS
!
!
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Desktop PC Power Supply
Internet Server Power Supply
IPC Power Supply
UPS
Battery Charger
DC Motor Power Supply
Monitor Power Supply
Telecom System Power Supply
Distributed Power
1
2
3
4
5
6
7
8
IEA O
I
AC
I
SENSE
V
RMS
SS
V
DC
R AM P 1
R AM P 2
V EA O
V
FB
V
REF
V
CC
P FC O U T
PWM OUT
GND
D C I
LIMIT
16
15
14
13
12
11
10
9
PIN CONFIGURATION
SOP-16 (S16) / PDIP-16 (P16)
Top View
PIN DESCRIPTION
Pin No.
1
Symbol
IEAO
Description
PFC transconductance current error amplifier output
Operating Voltage
Min.
Typ.
Max.
Unit
0
4.25
V
2
I
AC
PFC gain control reference input. Before the chip wakes up,
IAC is connected to VCC. After the chip wakes up, IAC is
connected to AGC.
0
1
mA
3
I
SENSE
Current sense input to the PFC current limit comparator
-5
0.7
V
4
V
RMS
Input for PFC RMS line voltage compensation
0
6
V
5
SS
Connection point for the PWM soft start capacitor
0
8
V
6
V
DC
PWM voltage feedback input
0
8
V
7
RAMP 1
(RTCT)
Oscillator timing node; timing set by RT CT
1.2
3.9
V
8
RAMP 2
When in current mode, this pin functions as the current sense
input; when in voltage mode, it is the PWM input from PFC
(PWM RAMP) output (feed forward ramp).
DC I
LIMIT
PWM current limit comparator input
0
6
V
9
0
1
V
10
GND
Ground
2003/06/25
Preliminary
Champion Microelectronic Corporation
Page 2
CM6802
N
O
B
LEED
R
ESISTOR
G
REEN
M
ODE
PFC/PWM C
ONTROLLER
C
OMBO
11
PWM OUT
PWM driver output
0
VCC
V
12
PFC OUT
PFC driver output
0
VCC
V
13
V
CC
Positive supply
10
15
20
V
14
V
REF
Buffered output for the internal 7.5V reference
7.5
V
15
V
FB
PFC transconductance voltage error amplifier input
PFC transconductance voltage error amplifier output
0
2.5
3
V
16
VEAO
0
6
V
BLOCK DIAGRAM
16
VEAO
IEAO
1
13
VCC
VCC
19.4V
VCC OVP
+
-
+
PFC OVP
.
7.5V
REFERENCE
VREF
14
15
VFB
-
GMv
.
VCC
IAC
VRMS
4
ISENSE
2.5V
+
.
+
-
-
2
GAIN
MODULATOR
3.5K
3
7
RAMP1
350
DUTY CYCLE
SW SPST
8
RAMP2
6
VDC
Vcc
-
20uA
350
SS
SW SPST
SW SPST
SW SPST
VIN OK
VREF
Q
S
9
DC ILIMIT
R
2003/06/25
Preliminary
Champion Microelectronic Corporation
+
5
2.45V
+
-
+
+
1.5V
+
-
0.5V
-
LOW POWER
DETECT
3.5K
+
2.75V
GMi
-
PFC CMP
S
Q
POWER
FACTOR
CORRECTOR
MPPFC
R
Q
VCC
PFC OUT
-1V
+
-
S
Q
12
PFC ILIMIT
R
Q
MNPFC
GND
OSCILLATOR
CLK
PWM
DUTY
PFCOUT
PWMOUT
LIMIT
PWM
CMP
MPPWM
VCC
PWM OUT
SS CMP
VFB
-
.
S
Q
11
R
Q
MNPWM
1.0V
DC ILIMIT
GND
PULSE
WIDTH
MODULATOR
VCC
UVLO
GND
fosc=2xfpwm=4xfpfc
10
Page 3
CM6802
N
O
B
LEED
R
ESISTOR
G
REEN
M
ODE
PFC/PWM C
ONTROLLER
C
OMBO
ORDERING INFORMATION
Part Number
CM6802IP
CM6802IS
Temperature Range
-40℃ to 125℃
-40℃ to 125℃
Package
16-Pin PDIP (P16)
16-Pin SOP (S16)
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter
V
CC
IEAO
I
SENSE
Voltage
PFC OUT
PWMOUT
Voltage on Any Other Pin
I
REF
I
AC
Input Current
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
)
Plastic DIP
Plastic SOIC
Min.
0
-5
GND – 0.3
GND – 0.3
GND – 0.3
Max.
20
4.5
0.7
VCC + 0.3
VCC + 0.3
VREF + 0.3
10
1
1
1
1.5
150
150
125
260
80
105
Units
V
V
V
V
V
V
mA
mA
A
A
µJ
℃
℃
℃
℃
℃/W
℃/W
-65
-40
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply Vcc=+15V, R
T
= 5.0kΩ, C
T
= 1.0nF, T
A
=Operating Temperature Range (Note 1)
CM6802
Min.
0
V
NONINV
= V
INV
, VEAO = 3.75V
Note 2
30
2.45
-1.0
5.8
V
FB
= 3V, VEAO = 6V
V
FB
= 1.5V, VEAO = 1.5V
11V < V
CC
< 16.5V
Current Error Amplifier (g
mi
)
Input Voltage Range
Transconductance
Input Offset Voltage
V
NONINV
= V
INV
, VEAO = 3.75V
-1.5
50
-12
100
0.7
150
12
V
µmho
mV
30
50
50
65
2.5
-0.5
6.0
0.1
-35
40
60
60
0.4
-20
Typ.
Max.
6
90
2.55
Symbol
Parameter
Test Conditions
Voltage Error Amplifier (g
mv
)
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
V
µmho
V
µA
V
V
µA
µA
dB
dB
2003/06/25
Preliminary
Champion Microelectronic Corporation
Page 4
CM6802
N
O
B
LEED
R
ESISTOR
G
REEN
M
ODE
PFC/PWM C
ONTROLLER
C
OMBO
ELECTRICAL CHARACTERISTICS
(Conti.)
Unless otherwise stated, these specifications apply
Vcc=+15V, R
T
= 5.0kΩ, C
T
= 1.0nF, T
A
=Operating Temperature Range (Note 1)
CM6802
Min.
-1.0
4.0
I
SENSE
= +0.5V, IEAO = 4.0V
I
SENSE
= -0.5V, IEAO = 1.5V
11V < V
CC
< 16.5V
PFC OVP Comparator
Threshold Voltage
Hysteresis
Low Power Detect Comparator
Threshold Voltage
Hystersis
VCC OVP Comparator
Threshold Voltage
Hysteresis
PFC I
LIMIT
Comparator
Threshold Voltage
(PFC I
LIMIT
V
TH
– Gain Modulator
Output)
Delay to Output (Note 4)
Threshold Voltage
Delay to Output (Note 4)
Threshold Voltage
Hysteresis
GAIN Modulator
I
AC
= 100µA, V
RMS
= V
FB
= 1V
Gain (Note 3)
I
AC
= 100µA, V
RMS
= 1.1V, V
FB
= 1V
I
AC
= 150µA, V
RMS
= 1.8V, V
FB
= 1V
I
AC
= 300µA, V
RMS
= 3.3V, V
FB
= 1V
Bandwidth
Output Voltage =
3.5K*(I
SENSE
-I
OFFSET
)
PFC Initial Accuracy
Voltage Stability
Temperature Stability
I
AC
= 100µA
I
AC
= 250µA, V
RMS
= 1.1V, V
FB
= 1V
Oscillator
T
A
= 25℃
11V < V
CC
< 16.5V
0.70
0.59
1.47
0.66
0.21
10
0.80
0.90
0.81
2.03
0.92
0.29
MHz
V
Overdrive Voltage = 100mV
V
IN
OK Comparator
2.35
0.8
2.45
1.0
2.55
1.2
V
V
Overdrive Voltage = -100mV
DC I
LIMIT
Comparator
0.95
1.0
250
1.05
V
ns
-1.10
80
-1.00
200
250
-0.90
V
mV
ns
19
1.40
19.4
1.5
20
1.65
V
V
0.4
0.5
0.25
0.6
V
V
2.70
230
2.77
2.85
290
V
mV
35
60
60
Typ.
-0.5
4.25
0.65
-65
75
70
75
1.0
-35
Max.
Symbol
Parameter
Input Bias Current
Output High Voltage
Output Low Voltage
Sink Current
Source Current
Open Loop Gain
Power Supply Rejection Ratio
Test Conditions
Unit
µA
V
V
µA
µA
dB
dB
66
1
2
75.5
kHz
%
%
2003/06/25
Preliminary
Champion Microelectronic Corporation
Page 5
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微控制器 MCU
