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&regulation

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&regulation

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