CM6807AGR
更新时间：2024-09-18 08:21:08
品牌：CHAMP
描述：10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
概述
数据手册CM6807AGR 概述
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter 10 -PIN绿色模式PFC / PWM组合控制器的高密度电源适配器
CM6807AGR 数据手册
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PDF下载CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
GENERAL DESCRIPTION
FEATURES
The CM6807A is the Green-Mode PFC/PWM Combo
controller for High Density AC Adapter. For the power
supply less than 200Watt, 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.
Patent Filed #5,565,761, #5,747,977, #5,742,151,
#5,804,950, #5,798,635
Both PFC and PWM have the Green Mode to meet blue
angel and energy star spec.
10-Pin SOIC package
PWM pulse skipping for the green mode
Use RAC as the Startup resistor which can be > 2000K or
higher at IAC pin
CM6807A 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 CM6807A
includes circuits for the implementation of a leading edge,
input current shaping technique “boost” type PFC and a
trailing edge, PWM.
It can use the HV bipolar to start up the chip and it helps
green mode.
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
The CM6807A’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.
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, VCCOVP, Precision -1V PFC ILIMIT, PFC
Tri-Fault Detect comparator to meet UL1950
Low supply currents; start-up: 100uA typical, operating
current: 2mA typical.
Both PFC and PWM have the Green Mode Functions.
When the load is below GMth, Green Mode Threshold,
PFCOUT is turned off. The GMth can be programmed by
the designer. PWM Green Mode will happen when the
PWMCMP (PWM Comparator) Duty Cycle is less than ~
6%, in the next cycle, the PWMOUT pulse will be removed
until PWMCMP Duty Cycle is greater than 6%, then the
next cycle, PWMOUT pulse appears.
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
PWM has a PWMtrifault pin which can sense the PWM
short and determine the GMth to turn off PFC.
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
PWMtrifault to sense DC to DC short and Turn off PFC at
GMth
PWMtrifault also can be programmed to do the Thermal
Protection
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 1
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
APPLICATIONS
PIN CONFIGURATION
10 Pin SSOP (R10)
Top View
AC Adaptor
Open Frame
PWM OUT
PFC OUT
VCC
1
2
3
4
5
10
9
GND
IAC
8
ISENSE
VEAO
PWMTRIFAULT
V + I
7
6
VFB
PIN DESCRIPTION
Operating Voltage
Pin No.
Symbol
Description
Min.
Typ.
Max. Unit
1
GND
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.
2
IAC
0
1
V
3
4
5
6
7
8
ISENSE
VEAO
VFB
Current sense input to the PFC current limit comparator
PFC transconductance voltage error amplifier output
PFC transconductance voltage error amplifier input
PWM current limit comparator input
-5
0
0.7
6
V
V
V
V
V
V
0
2.5
3
V + I
0
1.5
VCC
18
PWMTRIFAULT input; it can sense PWM Short or OVP
Positive supply
0
PWMTRIFAULT
VCC
10
9
PFC OUT PFC driver output
PWM OUT PWM driver output
0
0
VCC
VCC
V
V
10
ORDERING INFORMATION
Initial Accuracy (KHz)
Part Number
Operation Frequency
Temperature Range
Package
Min
Typ
Max
-40℃ to 125℃
-40℃ to 125℃
-40℃ to 125℃
CM6807AR/AGR* Fpwm = Fpfc = 67.5Khz
CM6807BR/BGR* Fpwm = Fpfc = 100Khz
CM6807CR/CGR* Fpwm = Fpfc = 135Khz
60
67
74
10 Pin SSOP(R10)
10 Pin SSOP(R10)
10 Pin SSOP(R10)
90
100
135
110
149
121
Note:
1.G : Suffix for Pb Free Product
2.Initial Accuracy : TA=25℃
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 2
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
BLOCK DIAGRAM
2
4
IAC
.VEAO
.
R1B
.
IAC
1
2
2
.
VCC
ISENSE
8
.
R1A
R1C
.
PFC CMP
UVB
-
+
1
2
VCC
3
-
1
.
+
S
Q
Q
V To Ramp
VFB
GMV
-
R
R
5
.
.
.
UVB
+
2.5V
VREFDK
9
FAULT
VCC OVP
PFCOUT
+
.
17.9V
16.4V
-
-
UVLO
VCC
.
.
BROKENWIRE
-
PFCCLK
PWMCLK
.
PFC CLK
PWM CLK
.
.
+
0.5V
fpfc=70KHz
PFC OVP
+
.
2.75V
2.5V
-
-
VIN-OK
S
Q
Q
VFB
+
PFC ILIMIT
-
.
R1
R2
2.45V
0.75V
UVB
-
-
.
VREFDK
10
PWMOUT
+
-1V
PWM SHORT
GREENPWM
+
-
VCC-0.7V
PWMTRIFAULT
7
+
-
PWMFAULT
(VCC-1.4V)/2
V=17uA
GREENMODE
10mS
GND
PWM CMP
1.5V
1
-
-
PWMCLK
.
.
GND
.
SS
GND
+
PROTECTED BY PATENT
SOFT START
6
V+I
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum ratings are those values beyond which the device could be permanently damaged.
Parameter
Min.
Max.
Units
V
VCC MAX
20
IAC (before start up)
IAC (after start up)
ISENSE Voltage
PFC OUT
GND-0.3
GND-0.3
-5
VCC + 0.3
1.0
V
V
0.7
V
GND – 0.3
GND – 0.3
0
VCC + 0.3
VCC + 0.3
6.3
V
PWM OUT
V
VEAO
V
PWMTrifault
GND – 0.3
GND-0.3
VCC + 0.3
VCC + 0.3
0.5
V
Voltage on Any Other Pin
V
Peak PFC OUT Current, Source or Sink
Peak PWM OUT Current, Source or Sink
PFC OUT, PWM OUT Energy Per Cycle
Junction Temperature
A
0.5
A
1.5
μJ
℃
150
℃
℃
Storage Temperature Range
Operating Temperature Range
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (θJA)
-65
-40
150
125
260
80
℃
℃/W
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 3
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply Vcc=+14V,
TA=Operating Temperature Range (Note 1)
CM6807A
Symbol
Parameter
Test Conditions
Unit
Min.
Typ.
Max.
Voltage Error Amplifier (gmv
)
Input Voltage Range
Transconductance
Feedback Reference Voltage
Input Bias Current
0
5
V
μmho
V
VNONINV = VINV, VEAO = 3.75V
Note 2
30
65
2.5
-0.5
6.0
0.1
-35
40
90
2.43
2.56
-1.0
μA
V
Output High Voltage
Output Low Voltage
Sink Current
5.8
0.4
-20
V
VFB = 3V, VEAO = 6V
μA
μA
dB
dB
Source Current
VFB = 1.5V, VEAO = 1.5V
30
50
50
Open Loop Gain
60
Power Supply Rejection Ratio
11V < VCC < 16.5V
IAC
60
ISENSE = 0V, TA=25℃
Input Impedance
35
40
45
K
VCC OVP Comparator
PFC OVP Comparator
PFC ILIMIT Comparator
VIN OK Comparator
Threshold Voltage
Hysteresis
17.3
1.3
17.9
1.5
18.5
1.75
V
V
Threshold Voltage
Hysteresis
2.64
230
2.77
2.85
300
V
mV
Threshold Voltage
Delay to Output
-1.1
-1
-0.9
300
V
150
ns
Threshold Voltage
Hysteresis
2.30
1.65
2.45
1.75
2.55
1.85
V
V
PWM Digital Soft Start
Right After Start Up
Digital Soft Start Timer (Note 2)
10
ms
V + I Comparator
Threshold Voltage
Normal operation without soft start
1.38
1.5
150
150
1.62
300
200
V
Delay to Output (Note 2)
Threshold Voltage
Ns
mV
During soft start condition
100
PFC Tri-Fault Detect Comparator
Fault Detect HIGH
2.70
2.77
2
2.85
4
V
ms
V
VFB=VFAULT DETECT LOW to VFB = OPEN,
470pF from VFB to GND
Time to Fault Detect HIGH
Fault Detect LOW
0.4
0.5
0.6
PWM Tri-Fault Detect Comparator
DC to DC Short
Sweep PWMtrifault
VCC-0.9
VCC-0.1
V
V
-400mV+
(VCC-1.
4)/2
+400mV
+(VCC-1
.4)/2
(VCC-1.4)
/2
Green Mode Threshold
Sweep PWMtrifault
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 4
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
ELECTRICAL CHARACTERISTICS (Conti.)Unless otherwise stated, these specifications apply
Vcc=+14V, TA=Operating Temperature Range (Note 1)
CM6807A
Symbol
Parameter
Test Conditions
Unit
Min.
Typ.
Max.
Oscillator
Voltage Stability
10V < VCC < 15V
1
2
%
%
Temperature Stability
Total Variation
Line, Temp
60
67
0.45
74.5
0.65
kHz
us
PFC Dead Time (Note 2)
0.3
PFC
Minimum Duty Cycle
Maximum Duty Cycle
Output Low Rdson
IAC=100uA,VFB=2.55V, ISENSE = 0V
IAC=0uA,VFB=2.0V, ISENSE = 0V
1
%
%
90
95
15
22.5
1.5
0.8
45
ohm
V
IOUT = -100mA
0.8
0.4
30
Output Low Voltage
IOUT = -10mA, VCC = 8V
V
Output High Rdson
Output High Voltage
Rise/Fall Time (Note 2)
ohm
V
IOUT = 100mA, VCC = 15V
13.5
0-46
14.2
50
CL = 1000pF
ns
PWM
Duty Cycle Range
Output Low Rdson
IC
0-50
22.5
1.5
%
ohm
V
15
0.8
0.7
30
IOUT = -100mA
Output Low Voltage
IOUT = -10mA, VCC = 8V
1.5
V
Output High Rdson
Output High Voltage
Rise/Fall Time (Note 2)
45
ohm
V
IOUT = 100mA, VCC = 15V
CL = 1000pF
13.5
14.2
50
ns
Supply
Start-Up Current
VCC = 11V, CL = 0
VCC = 15V, CL = 0
100
2
150
4.0
uA
mA
V
Operating Current
Undervoltage Lockout Threshold
Undervoltage Lockout Hysteresis
12.35
2.7
13
3
13.65
3.3
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.
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 5
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
TYPICAL PERFORMANCE CHARACTERISTIC
127
120
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 (gmv) Transconductance
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 6
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
Functional Description
Detailed Pin Descriptions
The CM6807A consists of an ICST (Input Current Shaping
Technique), CCM (Continuous Conduction Mode) or DCM
(Discontinuous Conduction Mode) boost PFC (Power
Factor Correction) front end and a synchronized PWM
(Pulse Width Modulator) back end. The CM6807A is
designed to replace FAN6803 (8 pin SOP package), which
is the second generation of the ML4803 with 8 pin package.
It is distinguished from earlier combo controllers by its low
count, innovative input current shaping technique, and very
low start-up and operating currents. The PWM section is
dedicated to peak current mode operation. It uses
conventional trailing-edge modulation, while the PFC uses
IAC (Pin 2)
Typically, it has a feedforward resistor, RAC, 2KK~10KK ohm
resistor connected between this pin and rectified line input
voltage.
This pin serves 2 purposes:
1.) During the startup condition, it supplies the startup
current; therefore, the system does not requires
additional bleed resistor to start up the chip.
2.) The current of RAC will program the automatic
slope compensation for the system. This
feedforward signal can increase the signal to noise
ratio for the light load condition or the high input line
voltage condition.
leading-edge
modulation.
This
patented
Leading
Edge/Trailing Edge (LETE) modulation technique helps to
minimize ripple current in the PFC DC buss capacitor.
Optional Resistor between IAC and VCC:
This resistor is about 100K ohm, it can improve the THD of
the input current at high line and light load
The main improvements from ML4803 are:
1.
2.
Add Green Mode Functions for both PFC and PWM
Remove the one pin error amplifier and add back the
slew rate enhancement gmv, which is using voltage
input instead of current input. This transconductance
amplifier will increase the transient response 5 to 10
times from the conventional OP
ISENSE (Pin 3)
This pin ties to a resistor which senses the PFC input
current. This signal should be negative with respect to the IC
ground. It internally feeds the pulse-by-pulse current limit
comparator and the current sense feedback signal. The
ILIMIT trip level is –1V. The ISENSE feedback is internally
multiplied by a gain of four and compared against the internal
programmed ramp to set the PFC duty cycle. The
intersection of the boost inductor current downslope with the
internal programming ramp determines the boost off-time.
3.
4.
VFB PFC OVP comparator
PFC Tri-Fault Detect for UL1950 compliance and
enhanced safety
5.
A feedforward signal from IAC pin is added to do the
automatic slope compensation. This increases the
signal to noise ratio during the light load; therefore,
THD is improved at light load and high input line
voltage.
It requires a RC filter between ISENSE and PFC boost
sensing resistor.
6.
7.
CM6807A does not require the bleed resistor and it
uses the more than 800k ohm resistor between IAC
pin and rectified line voltage to feed the initial current
before the chip wakes up.
VINOK comparator is added to guaranteed PWM
cannot turn on until VFB reaches 2.5V in which PFC
boost output is about steady state, typical 380V.
A 10mS digital PWM soft start circuit is added
10 pin SOP package
VEAO (Pin 4)
This is the PFC slew rate enhanced transconductance
amplifier output which needs to connected with
compensation network Ground.
a
8.
9.
VFB (Pin 5)
Besides this is the PFC slew rate enhanced
transconductance input, it also tie to a couple of protection
comparators, PFCOVP, and PFC Tri-Fault Detect
10. No internal Zener but with VCCOVP comparator
The CM6807A operates both PFC and PWM sections at
67kHz. This allows the use of smaller PWM magnetic and
output filter components, while minimizing switching losses
in the PFC stage.
V + I (Pin 6)
This pin is tied to the primary side PWM current sense
resistor or transformer. It provides the internal pulse-by-pulse
current limit for the PWM stage (which occurs at 1.5V) and
the peak current mode feedback path for the current mode
control of the PWM stage. Besides current information, the
optocouple also goes into V + I pin. Therefore, it is the SUM
Amplifier input.
Several protection features have been built into the
CM6807A. These include soft-start, redundant PFC
overvoltage protection, PFC Tri-Fault Detect, VINOK, peak
current limiting, duty cycle limiting, under-voltage lockout,
reference ok comparator and VCCOVP.
Soft Start can be triggered by the following conditions:
1.) During the startup (VCC is less than 10V)
2.) DC to DC short (PWMtrifault is greater thanVCC-0.7V)
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 7
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
PWMtrifault (Pin 7)
PFCOUT (Pin 9) and PWM OUT (Pin 10)
PFC OUT and PWM OUT are the high-current power driver
capable of directly driving the gate of a power MOSFET with
peak currents up to -1A and +0.5A. Both outputs are actively
held low when VCC is below the UVLO threshold level which
is 15V or VREFOK comparator is low.
This pin is to monitor the DC to DC faults. PWMtrifault
monitors the voltage which is translated by the photocouple
output current. When the output is short, photocouple and
TL431 will not draw any current and PWMtrifault will go
toward VCC.
When PWMtrifault is above VCC-0.7V, the soft start will be
triggered and PWMOUT is turned off. When the load is
lighter, the TL431 will increase the Photocouple current.
When PWMtrifault is below (VCC-1.4)/2, which means it is
below GMth, Green Mode Threshold. PFCOUT will be
turned off due the load is below GMth. The GMth can be
programmed by the user. Typical the GMth is 20% of the
full load.
Power Factor Correction
Power factor correction makes a nonlinear load look like a
resistive load to the AC line. For a resistor, the current drawn
from the line is in phase with and proportional to the line
voltage, so the power factor is unity (one). A common class
of nonlinear load is the input of most power supplies, which
use a bridge rectifier and capacitive input filter fed from the
line. The peak-charging effect, which occurs on the input
filter capacitor in these supplies, causes brief high-amplitude
pulses of current to flow from the power line, rather than a
sinusoidal current in phase with the line voltage. Such
supplies present a power factor to the line of less than one
(i.e. they cause significant current harmonics of the power
line frequency to appear at their input). If the input current
drawn by such a supply (or any other nonlinear load) can be
made to follow the input voltage in instantaneous amplitude,
it will appear resistive to the AC line and a unity power factor
will be achieved.
VCC (Pin 8)
VCC is the power input connection to the IC. The VCC
start-up current is 100uA. The no-load ICC current is 2mA.
VCC quiescent current will include both the IC biasing
currents and the PFC and PWM output currents. Given the
operating frequency and the MOSFET gate charge (Qg),
average PFC and PWM output currents can be calculated
as IOUT = Qg x F. The average magnetizing current
required for any gate drive transformers must also be
included. The VCC pin is also assumed to be proportional
to the PFC output voltage. Internally it is tied to the VCC
OVP comparator (17.9V) providing redundant high-speed
over-voltage protection (OVP) of the PFC stage. VCC also
ties internally to the UVLO circuitry and VREFOK
comparator, enabling the IC at 13V and disabling it at 10V.
VCC must be bypassed with a high quality ceramic bypass
capacitor placed as close as possible to the IC. Good
bypassing is critical to the proper operation of the
CM6807A.
To hold the input current draw of a device drawing power
from the AC line in phase with and proportional to the input
voltage, a way must be found to prevent that device from
loading the line except in proportion to the instantaneous line
voltage. The PFC section of the CM6807A uses
a
boost-mode DC-DC converter to accomplish this. The input
to the converter is the full wave rectified AC line voltage. No
bulk filtering is applied following the bridge rectifier, so the
input voltage to the boost converter ranges (at twice line
frequency) from zero volts to the peak value of the AC input
and back to zero.
VCC is typically produced by an additional winding off the
boost inductor or PFC Choke, providing a voltage that is
proportional to the PFC output voltage. Since the VCC OVP
max voltage is 17.9V, an internal shunt limits VCC
overvoltage to an acceptable value. An external clamp,
such as shown in Figure 1, is desirable but not necessary.
By forcing the boost converter to meet two simultaneous
conditions, it is possible to ensure that the current draws
from the power line matches the instantaneous line voltage.
One of these conditions is that the output voltage of the
boost converter must be set higher than the peak value of
the line voltage. A commonly used value is 385VFB, to allow
for a high line of 270VACrms. The other condition is that the
current that the converter is allowed to draw from the line at
any given instant must be proportional to the line voltage.
VCC
1N5250B
GND
Figure 1. Optional VCC Clamp
This limits the maximum VCC that can be applied to the IC
while allowing a VCC which is high enough to trip the VCC
OVP. An RC filter at VCC is required between boost trap
winding and VCC.
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 8
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
PFC Control: Leading Edge Modulation with Input
Therefore, equation (6) becomes:
Current Shaping Technique
(I.C.S.T.)
Id × toff
Id =
= Id × d ' = Id × (1− d) (7)
Tsw
The only differences between the conventional PFC control
topology and I.C.S.T. is:
Combine equation (7) and equation (5), and we get:
(d ' )2 ×Vout
the current loop of the conventional control method is a
close loop method and it requires a detail understanding
about the system loop gain to design. With I.C.S.T., since
the current loop is an open loop, it is very straightforward to
implement it.
Id × d ' =
Re
d ' ×Vout
∴Id =
∴Id =
(8)
Re
toff
Vout
The end result of the any PFC system, the power supply is
like a pure resistor at low frequency. Therefore, current is in
phase with voltage.
×
Re Tsw
In the conventional control, it forces the input current to
follow the input voltage. In CM6807A, the chip thinks if a
boost converter needs to behave like a low frequency
resistor, what the duty cycle should be.
From this simple equation (8), we implement the PFC control
section of the CM6807A.
Leading/Trailing Modulation
Conventional Pulse Width Modulation (PWM) techniques
employ trailing edge modulation in which the switch will turn
ON right after the trailing edge of the system clock. The error
amplifier output is then compared with the modulating ramp.
When the modulating ramp reaches the level of the error
amplifier output voltage, the switch will be turned OFF. When
the switch is ON, the inductor current will ramp up. The
effective duty cycle of the trailing edge modulation is
determined during the ON time of the switch. Figure 2 shows
a typical trailing edge control scheme.
The following equations is CM6807A try to achieve:
Vin
Re =
(1)
(2)
Iin
Il = Iin
Equation 2 means: average boost inductor current equals
to input current.
∴Vin × Il ≈ Vout × Id
(3)
In case of leading edge modulation, the switch is turned OFF
right at the leading edge of the system clock. When the
modulating ramp reaches the level of the error amplifier
output voltage, the switch will be turned ON. The effective
duty-cycle of the leading edge modulation is determined
during OFF time of the switch. Figure 3 shows a leading
edge control scheme.
Therefore, input instantaneous power is about to equal to
the output instantaneous power.
For steady state and for the each phase angle, boost
converter DC equation at continuous conduction mode is:
Vout
1
=
(4)
Vin
(1− d)
Rearrange above equations, (1), (2),(3), and (4) in term of
Vout and d, boost converter duty cycle and we can get
average boost diode current equation (5):
(1− d)2 ×Vout
Id =
(5)
Re
Also, the average diode current can be expressed as:
Toff
1
Id =
Id (t) ⋅ dt
(6)
∫
0
Tsw
If the value of the boost inductor is large enough, we can
assume Id (t) ~ Id . It means during each cycle or we
can say during the sampling, the diode current is a
constant.
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 9
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
One of the advantages of this control technique is that it
ZCV: Compensation Net Work for the Voltage Loop
GMv: Transconductance of VEAO
PIN: Average PFC Input Power
VOUTDC: PFC Boost Output Voltage; typical designed value is
380V.
required only one system clock. Switch 1(SW1) turns OFF
and switch 2 (SW2) turns ON at the same instant to
minimize the momentary “no-load” period, thus lowering
ripple voltage generated by the switching action. With such
synchronized switching, the ripple voltage of the first stage
is reduced. Calculation and evaluation have shown that the
120Hz component of the PFC’s output ripple voltage can be
reduced by as much as 30% using this method,
substantially reducing dissipation in the high-voltage PFC
capacitor.
CDC: PFC Boost Output Capacitor
ΔVEAO: This is the necessary change of the VEAO to deliver
the designed average input power. The average value is
6V-3V=3V since when the input line voltage increases, the
delta VEAO will be reduced to deliver the same to the output.
To over compensate, we choose the delta VEAO is 3V.
Typical Applications
PFC Section:
Internal Voltage Ramp
The internal ramp current source is programmed by way of
VEAO pin voltage. When VEAO increases the ramp current
source is also increase. This current source is used to
develop the internal ramp by charging the internal 30pF +12/
-10% capacitor. The frequency of the internal programming
ramp is set internally to 67kHz.
PFC Voltage Loop Error Amp, VEAO
The ML4803 utilizes an one pin voltage error amplifier in
the PFC section (VEAO). In the CM6807A, it is using the
slew rate enhanced transconductance amplifier, which is
the same as error amplifier in the CM6800. The unique
transconductance profile can speed up the conventional
transient response by 10 times. The internal reference of
the VEAO is 2.5V. The input of the VEAO is VFB pin.
Design PFC ISENSE Filtering
ISENSE Filter, the RC filter between Rs and ISENSE:
PFC Voltage Loop Compensation
There are 2 purposes to add a filter at ISENSE pin:
1.) Protection: During start up or inrush current
conditions, it will have a large voltage cross Rs,
which is the sensing resistor of the PFC boost
converter. It requires the ISENSE Filter to attenuate
the energy.
The voltage-loop bandwidth must be set to less than 120Hz
to limit the amount of line current harmonic distortion. A
typical crossover frequency is 30Hz.
The Voltage Loop Gain (S)
2.) Reduce L, the Boost Inductor: The ISENSE Filter
also can reduce the Boost Inductor value since the
ISENSE Filter behaves like an integrator before
going ISENSE which is the input of the current error
amplifier, IEAO.
ΔVOUT
ΔVEAO ΔVOUT
ΔVFB ΔVEAO
=
≈
*
*
ΔVFB
P
IN *2.5V
*GM *ZCV
V
V
OUTDC2 *ΔVEAO *S*CDC
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 10
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
The ISENSE Filter is a RC filter. The resistor value of the
ISENSE Filter is between 100 ohm and 50 ohm. By selecting
FILTER equal to 50 ohm will keep the offset of the IEAO less
than 5mV. Usually, we design the pole of ISENSE Filter at
fpfc/6, one sixth of the PFC switching frequency. Therefore,
the boost inductor can be reduced 6 times without
disturbing the stability. Therefore, the capacitor of the ISENSE
Filter, CFILTER, will be around 283nF.
PWM section wakes up after PFC reaches steady state
PWM section is off all the time before PFC VFB reaches
2.45V. Then internal 10mS digital PWM soft start circuit
slowly ramps up the soft-start voltage.
R
PFC OVP Comparator
PFC OVP Comparator sense VFB pin which is the same the
voltage loop input. The good thing is the compensation
network is connected to VEAO. The PFC OVP function is a
relative fast OVP. It is not like the conventional error amplifier
which is an operational amplifier and it requires a local
feedback and it make the OVP action becomes very slow.
The threshold of the PFC OVP is 2.5V+10% =2.75V with
250mV hysteresis.
IAC, RAC, Automatic Slope Compensation, DCM at high line
and light load, and Startup current
There are 4 purposes for IAC pin:
1.) For the leading edge modulation, when the duty
cycle is less than 50%, it requires the similar slope
compensation, as the duty cycle of the trailing
edge modulation is greater than 50%. In the
CM6807A, it is a relatively easy thing to design.
Use an more than 2KK ohm resistor, RAC to
connect IAC pin and the rectified line voltage. It
will do the automatic slope compensation. If the
input boost inductor is too small, the RAC may
need to be reduced more.
2.) During the startup period, Rac also provides the
initial startup current, 100uA;therefore, the bleed
resistor is not needed.
3.) Since IAC pin with RAC behaves as a feedforward
signal, it also enhances the signal to noise ratio
and the THD of the input current.
PFC Tri-Fault Detect Comparator
To improve power supply reliability, reduce system
component count, and simplify compliance to UL1950 safety
standards, the CM6807A includes PFC Tri-Fault Detect. This
feature monitors VFB (Pin 5) for certain PFC fault conditions.
In case of a feedback path failure, the output of the PFC
could go out of safe operating limits. With such a failure, VFB
will go outside of its normal operating area. Should VFB go
too low, too high, or open, PFC Tri-Fault Detect senses the
error and terminates the PFC output drive.
PFC Tri-Fault detect is an entirely internal circuit. It requires
no external components to serve its protective function.
4.) It also will try to keep the maximum input power to
be constant. However, the maximum input power
will still go up when the input line voltage goes up.
VCC OVP and generate VCC
For the CM6807A system, if VCC is generated from a source
that is proportional to the PFC output voltage and once that
source reaches 17.9V, PFCOUT, PFC driver will be off.
Start Up of the system, UVLO, VREFOK and Soft Start
During the Start-up period, RAC resistor will provide the start
up current~100uA from the rectified line voltage to IAC pin.
Inside of CM6807A during the start-up period, IAC is
connected to VCC until the VCC reaches UVLO voltage
which is 13V (UVB) and internal reference voltage is stable,
it will disconnect itself from VCC. During the Start up, the
soft start function is triggered and the duration of the soft
start will last around 10mS.
The VCC OVP resets once the VCC discharges below
16.4V, PFC output driver is enabled. It serves as redundant
PFC OVP function.
Typically, there is a bootstrap winding off the boost inductor.
The VCC OVP comparator senses when this voltage
exceeds 17.9V, and terminates the PFC output drive. Once
the VCC rail has decreased to below 16.4V the PFC output
drive be enabled. Given that 16V on VCC corresponds to
380V on the PFC output, 17.9V on VCC corresponds to an
OVP level of 460V.
PFC section wakes up after Start up period
After Start up period, PFC section will softly start since
VEAO is zero before the start-up period. Since VEAO is a
slew rate enhanced transconductance amplifier (see figure
3), VEAO has a high impedance output like a current
source and it will slowly charge the compensation net work
which needs to be designed by using the voltage loop gain
equation.
It is a necessary to put RC filter between bootstrap winding
and VCC. For VCC=15V, it is sufficient to drive either a
power MOSFET or a IGBT.
Before PFC boost output reaches its design voltage, it is
around 380V and VFB reaches 2.5V, PWM section is off.
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 11
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
UVLO
The UVLO threshold is 13V providing 3V hysteresis.
At normal operation, the threshold voltage of the V + I pin is
1.5V. When the V + I is greater than 1.5V, PWM output driver
will turn off the PWM Power MOSfet.
PFCOUT and PWMOUT
Both PFCOUT and PWMOUT are CMOS drivers. They both
have adaptive anti-shoot through to reduce the switching
loss. Its pull-up is a 30ohm PMOS driver and its pull-down
is a 15ohm NMOS driver. It can source 0.5A and sink 1A if
the VCC is above 15V.
When the Soft Start is triggered, the V+I threshold is around
150mV.
Soft Start Can be triggered by the following conditions:
1.) During the startup (VCC is less than 10V)
2.) DC to DC short (PWMtrifault is greater than VCC-0.7V)
During above 2 conditions, the V + I threshold is around
150mV until the conditions have been removed.
PWM Section
Green Mode
After above 2 conditions have been removed, the internal
Soft Start D to A will ramp up the voltage from ~150mV to
2V. Each Soft Start Ramp can last around 10mS.
CM6807A has the green mode function to improve the light
load efficiency. PWM Green Mode will happen when the
PWMCMP (PWM Comparator) Duty Cycle is less than ~
6%, in the next cycle, the PWMOUT pulse will be removed
until PWMCMP Duty Cycle is greater than 6%, then the
next cycle, PWMOUT pulse appears.
Short (PWMtrifault)
When PWMtrifault is greater VCC-0.7V, PWMOUT will be
turned off. It can be used to detected the following 2 things:
1.) Short Protection
2.) Thermal Shut Down
To achieve above item, it requires a negative temperature
coefficient Resistor.
In other words, during the green mode, PWM switching
frequency will reduce to improve the efficiency. With the
proper external components, CM6807A can easily meet
energy star and blue angel specification.
After 10mS digital soft start, CM6807A’s PWM is operating
as a typical current mode. It requires a secondary
feedback, typically, it is configured with CM431, and photo
couple.
The following figure shows the typical circuit for PWMtrifault
and V + I pins.
Turn off PFC(PWMtrifault)
Since PWM Section is different from CM6800 family, it
needs the emitter of the photo couple to connected with V +
I instead of the collector. The PWM current information also
goes into V + I. Usually, the PWM current information
requires a RC filter before goes into the V + I.
When PWMtrifault is less than (VCC-1.4V)/2, CM6807A will
turn off PFC. Usually; it means load has been reduced to a
level, which is the level of the Green Mode threshold.
Usually, we set the Green Mode threshold around 20% of the
full load.
Therefore, V + I actually is a summing node from voltage
information which is from photo couple and CM431 and
current information which is from one end of PWM sensing
resistor and the signal goes through a single pole, RC filter
then enter the V + I pin.
After turning off PFC, the efficiency will be increased due to
the input voltage is higher and less switching events.
Component Reduction
Components associated with the VRMS and IEAO pins of a
typical PFC controller such as the CM6800 have been
eliminated. The PFC power limit and bandwidth does vary
with line voltage.
This RC filter at V+I also serves several functions:
1.) It protects IC.
2.) It provides level shift for voltage information.
3.) It filters the switching noise from current
information.
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 12
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 13
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
APPLICATION CIRCUIT
D16(20A/150V)
DIODE SCHOTTKY
L3
L2
1
3
2
D1
KBP206G
F1
OR12*6*4
FR16*12*8
L5
RM10
3.15A,250V
1
1
2
D2
MUR460
ER39/PC40
TA1
-
+
R3
1.5M
L1
4
1
L
B001
3.5*9*1.3
C1
0.22UF
1
2
4
7
PIN
R5
NC
D15(20A/150V)
DIODE SCHOTTKY
2
R6
1.5M
1
1
R7
R8
N1
N
6T
16T
47K
C3
1000PF
1
2
5.2M
1
PIN
R11
3
R53
22K
2.7M
RT1
2.5
R48
47K
FG
D6
1N4148
1
3
PIN
FG1
J1
Q7
FLY2
9
1
R14
Q5
2
PIN
GMBTA44
+24V
R15
1M
16T
R16
0
2.2M
1
D8
2A07G
R13
100k
1N4148 D7
2
1
21
5
1
2SK2842
B002
R17
C7
22
3.5*6*1.2
D9
R18
2.2M
C5
0.47UF
U1 CM6807A
R19
0
1N4148
100uF/400V
1
2
3
4
5
10
9
2
1
2
1
2
1
GND
IAC
PWM OUT
PFC OUT
VCC
2
R55
68k
HSA2
1
1
VCC
1
C52
222
1
2SK3569
HSA1
2
1
1
FG
J3
Q9
VCC
2
1
C10
C11
C16
0.1UF
R21
22
2
R22
470
1
2
8
680uF/35V 680uF/35V
Isense
2
2
7
FLY1
GND
J1
VEAO PwmTrifault
R23
330K
C13
0.47U
R24
C26
0.47UF(474)
R008-1 R25
69.8K
6
C27
C49
102pF
0.27 2W
VFB
V+I
1
0.22 2W
1
47K
1
2
47nF(473)
R26
NC
R28
2
2
HS
C15
470PF
HS
1
2
2
1
2
1 2
1
4T
R27
C30
0.0045
10nF(103)
D10
D11
1
D12
1N4148
R29
4.7K
1N4001 1N4001
1
2
2
1
Q10
2222
VCC
2
13
2
2
1
R30
0
D13
1N4935
RT2
NC
R31
6.8K
1
1
Boost
Q11
2N7002
1 1
follow3er
1
ZD6
NC
C17
100uF NC
2
Q14
NC
R33
GND
J2
C28
PWM
Trifault
+24V
ZD4
Z.D 27V
100uF/25V
2
J3
C32
NC
R54
NC
ZD5
Z.D 15V
R51
NC
R35
220K
R34
1M
C19
105PF
1
Q13
NC
C20
R36
R52
NC
C31
NC
0.1UF 51
+24V
R37
2.4K
1
2
R38
470
2
1
4
3
1
2
R39
470
C51
C50
NC
PC1
PC817C
R41
10K
R40
33K
V+I
C21
0.1UF
1UF
1
2
C22
R42
1K
1
10pF(100)
R43
1K
2
1
1
1
3
5
3
U2
TSM103
R44
200K
2
2
7
D14
BAW56
R45
1K
C23
0.1UF
C24
0.1UF
C25
1UF
R46
R49
R47 R50
4.7K 22K
2.2K NC
Title
CM6807A 90W 24V Adaptor Schtooky-11A
Size
B
Document Number
CM6807A-90WAdaptor-Schottky
Rev
<RevCode>
Date:
Thursday, May 11, 2006
Sheet
1
of
1
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 14
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
PACKAGE DIMENSION
10 Pin-SSOP (R10)
PIN 1 ID
θ
ZD
B
NUMBERING SCHEME
Ordering Number: CM6807AXY (note1)
Ordering Number: CM6807AGXY (note2)
note1:
X : Suffix for Temperature Range (note 3)
Y : Suffix for Package Type (note 4)
note2:
G : Suffix for Pb Free Product
X : Suffix for Temperature Range (note 3)
Y : Suffix for Package Type (note 4)
note 3:
X= I : -40℃~+125℃
note 4:
R: SSOP-10
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 15
CM6807(A;B;C)
10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter
IMPORTANT NOTICE
Champion Microelectronic Corporation (CMC) reserves the right to make changes to its products or to discontinue any integrated
circuit product or service without notice, and advises its customers to obtain the latest version of relevant information to verify,
before placing orders, that the information being relied on is current.
A few applications using integrated circuit products may involve potential risks of death, personal injury, or severe property or
environmental damage. CMC integrated circuit products are not designed, intended, authorized, or warranted to be suitable for
use in life-support applications, devices or systems or other critical applications. Use of CMC products in such applications is
understood to be fully at the risk of the customer. In order to minimize risks associated with the customer’s applications, the
customer should provide adequate design and operating safeguards.
HsinChu Headquarter
Sales & Marketing
5F, No. 11, Park Avenue II,
Science-Based Industrial Park,
HsinChu City, Taiwan
7F-6, No.32, Sec. 1, Chenggong Rd.,
Nangang District, Taipei City 115
Taiwan, R.O.C.
T E L : +886-3-567 9979
F A X : +886-3-567 9909
T E L : +886-2-2788 0558
F A X : +886-2-2788 2985
http://www.champion-micro.com
2006/10/11 Rev1.0
Champion Microelectronic Corporation
Page 16
CM6807AGR 相关器件
| 型号 | 制造商 | 描述 | 价格 | 文档 |
| CM6807AR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807BGR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807BR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807CGR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807CR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807GIR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807GIRTR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807XIR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807XIRTR | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
| CM6807_10 | CHAMP | 10-PIN Green-Mode PFC/PWM Combo CONTROLLER for High Density AC Adapter | 获取价格 |
|
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