CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
GENERAL DESCRIPTION
The CM6805A is the Green-Mode PFC/PWM Combo
controller for Desktop PC and High Density AC Adapter.
For the power supply, it’s input current shaping PFC
performance could be very close to the performance of the
CM6800 or ML4800 leading edge modulation average
current topology.
CM6805A 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 CM6805A
includes circuits for the implementation of a leading edge
modulation, input current shaping technique “boost” type
PFC and a trailing edge modulation current, PWM.
The CM6805A’s PFC and PWM operate at the same
frequency, 67.5kHz. A 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.
PFC has a PFCOFFB pin which can use for AC brown out
application and determine the GMth to turn off PFC.
FEATURES
10-Pin SOIC package.
Use RAC around 4~8 Mega Ohm at IAC pin.
Easy to configure into Boost Follower.
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
Technique.
Feed forward IAC pin to do the automatic slope
compensation.
PFCOVP, Precision -1V PFC ILIMIT, PFC Tri-Fault
Detect comparator to meet UL1950
Low
supply
currents;
leading
start-up:
PFC
and
100uA
trailing
typical,
edge
operating current: 2mA typical.
Synchronized
modulation PWM to reduce ripple current in the
storage capacitor between the PFC and PWM
sections and to reduce switching noise in the system
VIN-OK Comparator to guarantee to enable PWM
when PFC reach steady state
High efficiency trailing-edge current mode PWM
Exact 50% PWM maximum duty cycle
UVLO, REFOK, and brownout protection
Digital PFC and PWM soft start, ~10mS
Precision PWM 1.5V current limit for current mode
operation
PFCOFFB pin to sense light load to turn off PFC or
PFCOFFB pin to sense Input voltage as AC Brown
Out
PFC
using
Input
Current
Shaping
2010/04/20 Rev 1.4
Champion Microelectronic Corporation
Page 1
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
APPLICATIONS
Desktop PC
AC Adaptor
Open Frame
PIN CONFIGURATION
10 Pin SSOP (R10)
Top View
PIN DESCRIPTION
Pin No.
1
2
GND
IAC
Symbol
Ground
Feedforward input to do slope compensation and to start up
the system. During the start up, IAC is connected to VCC
until VCC is greater than 13V.
Current sense input to the PFC current limit comparator
PFC transconductance voltage error amplifier output
PFC transconductance voltage error amplifier input
PWM feed back and current limit comparator input
PFCOFFB; it can turn off PFC stage when it is below 5V.
Positive supply
PFC driver output
PWM driver output
0
7
V
Description
Min.
Operating Voltage
Typ.
Max.
Unit
3
4
5
6
7
8
9
10
I
SENSE
VEAO
V
FB
V+I
PFCOFFB
VCC
PFC OUT
PWM OUT
-5
0
0
0
0
10
0
0
15
2.5
0.7
6
3
1.5
VCC
18
VCC
VCC
V
V
V
V
V
V
V
V
ORDERING INFORMATION
Part Number
Operation Frequency
Initial Accuracy (KHz)
Min
CM6805AGIR*
CM6805AGIRTR*
Fpwm = Fpfc = 67.5Khz
Fpwm = Fpfc = 67.5Khz
60
60
Typ
67.5
67.5
Max
74
74
-40℃ to 125℃
-40℃ to 125℃
10 Pin SSOP(R10)
10 Pin SSOP(R10)
Temperature Range
Package
Note:
1.G : Suffix for Pb Free Product
2.
TR : Package is Typing Reel
3.Initial Accuracy : T
A
=25℃
2010/04/20 Rev 1.4
Champion Microelectronic Corporation
Page 2
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
BLOCK DIAGRAM
2
IAC
40K
IAC
4
.VEAO
8
VCC
400K
S
R
R
.
Q
ISENSE
3
100K
-
-
+
PFC CMP
Q
UVB
VREFDK
SUM
VFB
5
-
.
2.5V
+
.
.
+
9
PFCOUT
V To Ramp
GMV
UVLO
FAULT
VCC
.
.
BROKENWIRE
-
.
0.5V
+
PFCCLK
.
PFC CLK
.
fpfc=67.5KHz
PFC OVP
+
2.75V
2.5V
.
-
-
VFB
2.25V
1.1V
PWMCLK
PWM CLK
VIN-OK
+
.
-
-
R1
R2
Q
VREFDK
S
Q
UVB
10
PWMOUT
-
PFC ILIMIT
.
-1V
+
PFCOFFB
7
5.5V
5V
-
SHUTDOWN PFC
.
+
+
PWMCLK
GND
10mS
PWM CMP
1.5V
.
.
-
-
.
+
SS
1
GND
SOFT START
6
V+I
PROTECTED BY PATENT
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter
Min.
Max.
V
CC
MAX
IAC
I
SENSE
Voltage
PFC OUT
PWM OUT
VEAO
PFCOFFB
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
)
-65
-40
GND-0.3
-5
GND – 0.3
GND – 0.3
0
GND – 0.3
GND-0.3
20
7.0
0.7
VCC + 0.3
VCC + 0.3
6.3
VCC + 0.3
VCC + 0.3
40
0.5
0.5
1.5
150
150
125
260
80
Units
V
V
V
V
V
V
V
V
mA
A
A
μJ
℃
℃
℃
℃
℃/W
2010/04/20 Rev 1.4
Champion Microelectronic Corporation
Page 3
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
ELECTRICAL CHARACTERISTICS
T
A
=Operating Temperature Range (Note 1)
Unless otherwise stated, these specifications apply Vcc=+14V,
Symbol
Parameter
Test Conditions
Voltage Error Amplifier (GM
v
)
CM6805A
Min.
0
Typ.
Max.
5
65
2.5
-0.5
5.8
6.0
0.1
0.4
-20
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
11V < V
CC
< 16.5V
IAC
Input Impedance (CM6805A)
ISENSE = 0V, T
A
=25℃
PFC OVP Comparator
Threshold Voltage
Hysteresis
PFC I
LIMIT
Comparator
Threshold Voltage
Delay to Output
V
IN
OK Comparator
Threshold Voltage (CM6805A)
Hysteresis
PWM Digital Soft Start
Digital Soft Start Timer (Note 2)
Right After Start Up
V + I Comparator
Threshold Voltage
Delay to Output (Note 2)
Threshold Voltage
During soft start condition
PFC
Fault Detect HIGH
Time to Fault Detect HIGH
Fault Detect LOW
V
FB
=V
FAULT DETECT LOW
to V
FB
= OPEN,
470pF from V
FB
to GND
Tri-fault
Normal operation without soft start
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
30
2.44
-35
30
50
50
40
60
60
35K
40K
50K
Ohm
2.64
65
2.77
2.85
150
V
mV
-1.05
-1
150
-0.95
300
V
ns
2.16
1.13
2.26
1.17
2.36
1.21
V
V
10
ms
1.38
1.5
150
1.62
300
200
V
ns
mV
100
150
2.70
2.77
2
2.85
4
0.6
V
ms
V
0.4
0.5
2010/04/20 Rev 1.4
Champion Microelectronic Corporation
Page 4
CM6805A
10-PIN Green-Mode PFC/PWM Combo CONTROLLER
ELECTRICAL CHARACTERISTICS
T
A
=Operating Temperature Range (Note 1)
Unless otherwise stated, these specifications apply Vcc=+14V,
Symbol
Parameter
Test Conditions
PFCOFFB
CM6805A
Min.
4.75
350
Typ.
5.0
500
Max.
5.25
750
Unit
PFCOFFB Threshold Low
PFCOFFB Hysteresis
PFCOFFB
V
mV
PFC Frequency
Voltage Stability
Temperature Stability
Total Variation
PFC Dead Time (Note 2)
PFC
Minimum Duty Cycle
Maximum Duty Cycle
Output Low Rdson
Output Low Voltage
Output High Rdson
Output High Voltage
Rise/Fall Time (Note 2)
I
OUT
= 100mA, V
CC
= 15V
C
L
= 1000pF
PWM
Duty Cycle Range
Output Low Rdson
Output Low Voltage
Output High Rdson (Note 2)
Output High Voltage
Rise/Fall Time (Note 2)
IC
At room temp
I
OUT
= -100mA
I
OUT
= -10mA, V
CC
= 8V
At room temp
I
OUT
= 100mA, V
CC
= 15V
C
L
= 1000pF
Supply
Start-Up Current
Operating Current
Under voltage Lockout Threshold
Under voltage Lockout Hysteresis
V
CC
= 11V, C
L
= 0
V
CC
= 15V, C
L
= 0
12.35
2.7
135
2
13
3
150
4
13.65
3.3
uA
mA
V
V
13.5
49
49.5
15
0.8
0.7
30
14.2
50
50
22.5
1.5
1.5
45
%
ohm
V
V
ohm
V
ns
13.5
I
OUT
= -100mA
I
OUT
= -10mA, V
CC
= 8V
I
AC
=100uA,V
FB
=2.55V, I
SENSE
= 0V
I
AC
=0uA,V
FB
=2.0V, I
SENSE
= 0V
90
95
15
0.8
0.4
30
14.2
50
22.5
1.5
0.8
45
1
%
%
ohm
V
V
ohm
V
ns
Line, Temp (CM6805A)
60
0.3
10V < V
CC
< 15V
1
2
67.5
0.45
74
0.65
%
%
kHz
us
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.
2010/04/20 Rev 1.4
Champion Microelectronic Corporation
Page 5
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