championmicro - banner span micro/cm6800... · 2008. 5. 16. · atx power lcd tv pdp ipc : active...
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ChampionmicroCM6800 PFC/PWM combo controller
AE/Elvis
Goal:Input current shaping(PFC stage)
Output voltage regulation(PWM stage)
Application product:ATX powerLCD TV
PDP
IPC
:
Active PFC Power Supply
AC in90rms~265rms
EMI
Filter
rect
ifie
r
CM6800PFC/PWM combo
Boost ForwardAC to DC DC to DC
AC to DC DC to DC
380V
24V
3.3V
FunctionsPFC :PFC O.V.P
vin-ok (PFC/O.K) VCC O.V.PVCC U.V.L.O Input current limitPFC low power detect
PWM :Soft-startPWM current limit
5
CM6800 Block
VFB
PWMOUT8RAMP2
14VREF
3.5K
1.0V
PFC OVP+
-
.+
-
VCC OVP
SW SPST
9DC ILIMIT
12PFC OUT
350
0.5V
1
IEAO
S
R
Q
Q
2.5V
GND
S
R
Q
TRI-FAULT
350
5SS
PFC CMP
4VRMS
GMv
+
-
.
MNPW M
DUTY CYCLE
LIMIT
16
VEAO
CLK
17.9V
1.5V
VCC
GND
7RAMP1
OSCILLATOR
+
-
MPPWM
GAINMODULATOR
VCC
SW SPSTVIN OK
+
-
.
+
-
PFC ILIMIT
2.75V
+
-
PWMDUTY
VCC
Vcc
SW SPST
S
R
Q
Q
LOW POWERDETECT
PWMCMP
GMi+
-
.
+
-
11
PWM OUT
3.5K
MPPFC
+
-
UVLO
+
-
PFCOUT
6VDC
3ISENSE
7.5VREFERENCE
SS CMP
VCC
+
-
DC ILIMIT
20uA
2IAC
S
R
Q
Q
MNPFC
SW SPST
POWERFACTORCORRECTOR
2.45V
10GND
15VFB
13
VCC
-1V
0.5V
PULSEWIDTHMODULATOR
VREF
6
14VREF
3.5K
PFC OVP+
-
.+
-
VCC OVP
12PFC OUT
0.5V
1
IEAO
2.5V
GND
TRI-FAULT
PFC CMP
4VRMS
GMv
+
-
.
16
VEAO
17.9V
7RAMP1
OSCILLATOR
+
-
GAINMODULATOR
+
-
PFC ILIMIT
2.75V
VCC
S
R
Q
Q
LOW POWERDETECT
GMi+
-
.
3.5K
MPPFC
+
-
+
-
3ISENSE
7.5VREFERENCE
VCC
2IAC
S
R
Q
Q
MNPFC
POWERFACTORCORRECTOR
15VFB
13
VCC
-1V
0.5V
VoutL
Rsense
sw-offsw-on
)(tv g sw
64R45C
10R
11R
60R
44C
PFC block
7
Topics•PFC turn-on-off•PFC O.V.P•VFB•Input current limit•PFC low power detect•PWM turn-on-off•PFC-PWM timing•VCC O.V.P•VCC U.V.L.O•PWM current limit•Control•Compensation
V380
VFB
PFC
•VFB>0.5V PFC turn-on
•VFB=2.5V PFC stage OK(vin O.K)
PFC turn-on
•VFB<0.5V PFC turn-off
V380
VFB
PFC
PFC turn-off
V380
VFB
PFC
PFC O.V.P
PFC OVP
+
-
.
12PFC OUT
GND
2.75V
VCC
S
R
Q
QMPPFC
S
R
Q
Q
MNPFC
VFB
VFB>2.75V PFC turn-off
11
VFB1.0V
PFC OVP+
-
.
SW SPST
9DC ILIMIT
12PFC OUT
0.5V
S
R
Q
Q
GND
S
R
Q
350
5SS MNPWM
VCC
GND
+
-
MPPWM
VCC
SW SPSTVIN OK
+
-
.
2.75V
VCC
Vcc
SW SPST
S
R
Q
Q
+
- 11
PWM OUT
MPPFC
UVLO
SS CMP
+
-
DC ILIMIT
20uA
MNPFC
2.45V
15VFB
VREF
TRI-FAULT
VFB
12
V380
PFC
SS
PWM
PWM
V380
PFC
SS
VFB
VFB>2.75V PFC turn-offVFB<2. 5V PWM turn-off
12
PFC OUT
GND
+
-
PFC ILIMIT
VCC
S
R
Q
Q
MPPFC
3ISENSE
MNPFC
-1V
VoutL
Rsense
sw-off
sw-on
)(tvgsw
input current limit
14
Current waveform
PFC duty cycle by cycle reduce
PFC
VIeao
V380
Veao
PFC low power detect
If VEAO<0.3 PFC pulse skipping
3.5K
12
PFC OUT
2.5V
GND
4VRMS
GMv
+
-
.
16
VEAO
GAIN
MODULATOR
VCC
S
R
Q
Q
LOW POWER
DETECT
GMi+
-
.
3.5K
MPPFC
+
-
3ISENSE
2IAC
S Q
MNPFC
15VFB
0.5V
VEAO
VEAO
V380
PFCskipping
•Vsoft>1.25V PWM turn-on
•Vsoft<1.25V PWM turn-off
v-soft
PWM
PWM turn-on-off
PFC-PWM timing
SS
VCC
VREF
350
SS
VCC U.V.L.O Vin O.K DC-ILIMIT
VCC U.V.L.O Vin O.K DC-ILIMIT
PWM
SS
18
V380
PFC
SS
PWM
V380
PFC
SS
PWM
PFC-PWM timing waveform
VCC O.V.P
VCC
PFC
PWM
SS
O.V.P
VCC OVP+
-
.
VCC
VCC
9V17.
MPPFC
MNPFC
GND
S
R
Q
Q
12
PFC OUT
SW SPST
12
PFC OUT
GND
350
5
SS
VCC
GND
VCC
Vcc
11
PWM OUT
20uA
VREF VCC UVLO
VCC
PFC
PWM
SS
SW SPST
12
PFC OUT
GND
350
5
SS
VCC
GND
VCC
Vcc
11
PWM OUT
20uA
VREF VCC UVLO
VCC U.V.L.O
V380
DC-Ilimit
PWM
Vout
AC in90 rms ~265 rms
EMI
Filterre
ctif
ier
CM6800PFC/PWM combo
1.0V
DC ILIMIT
S
R
Q
Q
MNPWM
VCC
GND
MPPWM
PWMDUTY
PWM OUT
+
-
DC ILIMIT
DUTY CYCLELIMIT
PWM current limit
PWM duty cycle by cycle reduce
V380
PWM
Vout
DC-Ilimit
DC-Ilimit current waveform
23
Waveform discussPFC(leading-edge)
Ramp1
VIeao
PFC
Ramp1VIeao
Veao
PFC
24
Waveform discussPWM(trailing-edge)
PWM
Ramp2
VDC
Ramp2
VDC
PWM
25
Disable CM6800PFC:Veao pull-lowPWM:Soft-start pull-low
26
Summary
VCC OK VFB>0.5V VFB=2.5V
PFC turn-on
vin ok SS>1.25V
VCCU.V.L.O
PFC turn-offPWM turn off
VCC O.V.P PFC turn-off vin okX PWM turn-off
VFB>2.75V PFC turn-off
SS<1.25V
VFB<2.5V vin okX
PFC Duty-cycle limit
PWM Duty-cycle limit
Isense
DC-ILIMIT
PFC O.V.P
PWM turn-on
27
xY
plant controller0→e
Control 2
Goal:P.F&V380
Vout
C380vin(t)
vg(t)
Rsense
e(s)GI
boost converter
(t)ig
(t)V α (t)i gg
V380????
Control 1
28
Vref(s)GV
K
vctrl
Vout
C380vin(t)
vg(t)
Rsense
e(s)GI
boost converter
(t)ig
(t)i α (t) vK vctrl gg
PFC®ulation
29vctrl
Vout
C380vin(t)
vg(t)
Rsense
e
boost converter
(t)ig
(s)GI
Vref(s)GV
K
A
L
38022
gA
L
38022
g
RV
2ARev
RV
2Rev
=⎯→⎯=
2gvA =
VFB
IACIeao
Veao
Isense
Vrms
PFC®ulation
30
6800 circuittsinωVM
IEAO
IAC
I-SENSE
SS
VDC
RAMP1
RAMP2
VRMS
VEAO
VFB
VCC
PWM-OUT
PFC-OUT
GND
I-LIMIT
VREF
CM6800
58R 43C
41C
VREF
49C
57R
63R
56C
1R
PWM-OUT
64R45C 48C
56R
RFilter
CFilter
RSENSE59R
46C
10R
11R
60R
12R 13R
61R
57C
51C44C
PFC
PWM
31
Note:AC to DCCompensation ruleReference CM6800 compensation word files
Note
32
INPUT POWER W 74.746
PF % 0.869
INPUT AC VOLTAGE V 230.66
INPUT CURRENT A 0.373
FREQUENCY Hz 50.061
+5V LOADING A+12V LOADING A-5V LOADING A-12V LOADING A
+3.3V LOADING A+5Vaux LOADING A
Po 0EFFIENCY 0%
N A READING SPEC. %3 0.254136 0.07146 0.25 28.20%5 0.142017 0.01806 0.14 12.75%7 0.074746 0.01351 0.07 18.13%9 0.037373 0.01069 0.04 28.69%11 0.026161 0.00575 0.03 22.04%13 0.022136 0.00727 0.02 32.94%15 0.019185 0.00896 0.02 46.84%17 0.016928 0.00152 0.02 9.01%19 0.015146 0.00656 0.02 43.44%21 0.013703 0.00474 0.01 34.69%23 0.012512 0.00115 0.01 9.22%25 0.011511 0.00397 0.01 34.59%27 0.010658 0.00394 0.01 37.07%29 0.009923 0.00172 0.01 17.38%31 0.009283 0.0017 0.01 18.37%33 0.00872 0.0034 0.01 39.10%35 0.008222 0.00226 0.01 27.57%37 0.007778 0.00105 0.01 13.54%39 0.007379 0.00326 0.01 44.31%
Harmonic
0.00%
5.00%
10.00%
15.00%
20.00%
25.00%
30.00%
35.00%
40.00%
45.00%
50.00%
3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39
Nth
Hamonic
33
90VAC @ Max3.16A 264VAC @ Max3.16A
Power factor
34
Summary
IEAO
IAC
I-SENSE
SS
VDC
RAMP1
RAMP2
VRMS
VEAO
VFB
VCC
PWM-OUT
PFC-OUT
GND
I-LIMIT
VREF
CM6800
VREF
58R 43C
41C
64R
10R
11R
60R
44C 45C49C
C
380 V
63R
56C57C
tsinωVM
51C
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