Champion CM6800T General Description Manual

CM6800T (Turbo-Speed PFC+Green PWM)

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

GENERAL DESCRIPTION

FEATURES

CM6800T is a turbo-speed PFC and a Green PWM controller.
It is designed to further increase power supply efficiency while
using the relatively lower 380V Bulk Capacitor value.
Switching to CM6800T from your existing CM6800 family
boards can gain the following advanced performances:

1.) Hold Up time can be increased ~ 30% from the
existing 6800 power supply

2.) Turbo Speed PFC may reduce 420 Bulk Capacitor
size

3.) 420V bulk capacitor value may be reduced and PFC
Boost Capacitor ripple current can be reduced

4.) No Load Consumption can be reduced 290mW at
270VAC

5.) Better Power Factor and Better THD

6.) Clean Digital PFC Brown Out

7.) PWM transformer size can be smaller

8.) Superior Surge Noise Immunity

9.) To design 12V, 5V, and 3.3V output filters can be easy

10.) The stress over the entire external power device is
reduced and EMI noise maybe reduced; PFC inductor
core might be reduced

11.) Monotonic Output design is easy

12.) And more… Of course, the cost can be reduced

CM6800T is pin to pin compatible with CM6800 family.
Beside all the goodies in the CM6800, it is designed to meet
the EPA/85+ regulation. With the proper design, its efficiency
of power supply can easily approach 85%.

To start evaluating CM6800T from the exiting CM6800,
CM6800A, or ML4800 board, 6 things need to be taken care
before doing the fine tune:

1.) Change RAC resistor (on pin 2, IAC) from the old
value to a higher resistor value between 4.7 Mega
ohm to 8 Mega ohm. Start with 6 Mega ohm for RAC
first.

2.) Change RTCT pin (pin 7) from the existing value to
RT=5.88K ohm and CT=1000pF to have fpfc=68Khz,
fpwm=68Khz, frtct=272Khz for CM6800T

3.) Adjust all high voltage resistor around 5 mega ohm or
higher.

4.) VRMS pin(pin 4) needs to be 1.14V at VIN=80VAC for
universal input application from line input from 80VAC
to 270VAC.

5.) At full load, the average Veao needs to around 4.5V
and the ripple on the Veao needs to be less than
250mV when the load triggers the light load
comparator.

6.) Soft Start pin (pin 5), the soft start current has been
reduced from CM6800’s 20uA to CM6800T’s
10uA.Soft Start capacitor can be reduced to 1/2 from
your original CM6800 capacitor.

 Patents Pending

 Pin to pin compatible with CM6802 family, CM6800

family, and ML4800 family

 23V Bi-CMOS process

 Designed for EPA/85+ efficiency

 Digitized Exactly 50% Maximum PWM Duty Cycle

 All high voltage resistors can be greater than 4.7 Mega

ohm (4.7 Mega to 8 Mega ohm) to improve the no load
consumption

 Rail to rail CMOS Drivers with on, 60 ohm and off, 30

ohm for both PFC and PWM with two 17V zeners

 Fast Start-UP Circuit without extra bleed resistor to aid

VCC reaches 13V sooner

 Low start-up current (55uA typ.)

 Low operating current (2.5mA typ.)

 16.5V VCC shunt regulator

 Leading Edge Blanking for both PFC and PWM

 fRTCT = 4*fpfc =4*fpwm for CM6800T

 Dynamic Soft PFC to ease the stress of the Power

Device and Ease the EMI filter design

 Clean Digital PFC Brown Out and PWM Brown Out

 Adjustable Long Delay Time for Line Sagging

(Up to 2 Second)

 Turbo Speed PFC may reduce 420 Bulk Capacitor size

 Internally synchronized leading edge PFC and trailing

edge PWM in one IC to Reduces ripple current in the
420V storage capacitor between the PFC and PWM
sections

 Better Power Factor and Better THD

 Average current, continuous or discontinuous boost

leading edge PFC

 PWM configurable for current mode or feed-forward

voltage mode operation

 Current fed Gain Modulator for improved noise

immunity

 Gain Modulator is a constant maximum power limiter

 Precision Current Limit, over-voltage protection, UVLO,

soft start, and Reference OK

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 1

CM6800T (Turbo-Speed PFC+Green PWM)

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

APPLICATIONS PIN CONFIGURATION

 EPA/85+ related Power Supply

 Desktop PC Power Supply

 Internet Server Power Supply

 LCD Power Supply

 PDP Power Supply

 IPC Power Supply

 UPS

 Battery Charger

 DC Motor Power Supply

 Monitor Power Supply

 Telecom System Power Supply

 Distributed Power

SOP-16 (S16) / PDIP-16 (P16)

1

2

3

4

5

6

7

8

IEAO

IAC

ISENSE

VRMS

SS

VDC

RAMP1

RAMP2

VEAO

VFB

VREF

VCC

PFC OUT

PWM OUT

GND

DC ILIMIT

16

15

14

13

12

11

10

9

PIN DESCRIPTION

Pin No. Symbol Description

PFC transconductance current error amplifier output

1

2

3

4

I

EAO

I

AC

I

SENSE

V

RMS

(Gmi).

IAC has 2 functions:

1. PFC gain modulator reference input.

2. Typical RAC resistor is about 6 Mega ohm to sense

the line.

PFC Current Sense: for both Gain Modulator and PFC

ILIMIT comparator.

Line Input Sense pin and also, it is the brown out sense

pin.

Operating Voltage

Min. Typ. Max. Unit

0 VREF V

0 100 uA

-1.3 0.7 V

0 8 V

Soft start capacitor pin; it is pulled down by 70K ohm

5 SS

internal resistor when DCILIMIT reach 1V; the power is

limited during the PWM Brown out.

0 VCC V

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 2

CM6800T (Turbo-Speed PFC+Green PWM)

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

6 VDC

DC to DC PWM voltage feedback input.

RAMP1

7

Oscillator timing node; timing set by RT and CT

(RTCT)

8

RAMP 2

(PWM

In current mode, this pin functions as the current
sense input; when in voltage mode, it is the
feed-forward sense input from PFC output 380V (feed
forward ramp).

RAMP)

9 DC I

LIMIT

10 GND

11 PWM OUT

12 PFC OUT

13 VCC

14 VREF

PWM current limit comparator input

Ground

PWM driver output

PFC driver output

Positive supply for CM6800T

Maximum 3.5mA buffered output for the internal 7.5V

reference when VCC=14V

0 10 V

0.8 4 V

0 V

DCmax

-1.8 V

0 1 V

0 VCC V

0 VCC V

10 15 18 V

7.5 V

15 VFB

16 VEAO

PFC transconductance voltage error amplifier input

PFC transconductance voltage error amplifier output

(GmV)

ORDERING INFORMATION

Part Number Temperature Range Package

CM6800TXIP*

CM6800TXIS*

CM6800TXISTR*

*Note:

X : Suffix for Halogen Free and PB Free Product

TR : Package is Typing Reel

-40℃ to 125℃

-40℃ to 125℃

-40℃ to 125℃

0 2.5 3 V

0 6 V

16-Pin PDIP (P16)

16-Pin Narrow SOP (S16)

16-Pin Narrow SOP (S16)

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 3

CM6800T (Turbo-Speed PFC+Green PWM)

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

Simplified Block Diagram (CM6800T)

13

7.5V

REFERENCE

Q

Q

VCC

MPPFC

MNPFC

PPWM

NPFC

VCC

PFC OUT

VCC

PWM OUT

VREF

17V

ZENER

17V

ZENER

14

12

11

VFB

15

IAC

2
4

3

7

8

6

5

VRMS

ISENSE

RAMP1

RAMP2

VDC

VCC

SS

2.5V

10uA

16

GMv

+

.

-

GAIN

MODULATOR

2K

SW SPST

1.8V

70K

VEAO

PFC

Rmul

PFCCLK

PWMCLK

+

-

-

+

-

Rmul

GMi

.

1

IEAO

PFC CMP

+

-

PFC RAMP

.

.

VFB

2.36V

-

+

380V-OK

VFB

2.75V

0.5V
VFB

-1.0V

ISENSE

0.3V

VEAO

Green PWM

.

PFC OVP

+

-

PFC Tri-Fault

+

-

PFC ILIMIT

+

-

Green PFC

+

-

.

16.5V
Zener

SRQ

S

SRQ

SRQ

Q

380-OK

DC ILIMIT

9

GND

10

REF-OK

1.0V

-

+

DC ILIMIT

VCC

UVLO

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum ratings are those values beyond which the device could be permanently damaged.

Parameter Min. Max. Units

VCC 18 V
IEAO 0 VREF+0.3 V
I

Voltage -5 0.7 V

SENSE

PFC OUT
PWMOUT
Voltage on Any Other Pin
I

REF

IAC Input Current

GND – 0.3 VCC + 0.3 V
GND – 0.3 VCC + 0.3 V
GND – 0.3 VCC + 0.3 V

3.5 mA
1 mA

Peak PFC OUT Current, Source or Sink 0.5 A
Peak PWM OUT Current, Source or Sink 0.5 A
PFC OUT, PWM OUT Energy Per Cycle 1.5

Junction Temperature 150
Storage Temperature Range -65 150
Operating Temperature Range -40 125
Lead Temperature (Soldering, 10 sec) 260
Thermal Resistance (θJA)

Plastic DIP
Plastic SOIC

Power Dissipation (PD) TA<50℃

80
105

800 mW

μ

J

℃
℃
℃
℃

℃/W
℃/W

ESD Capability, HBM Model 5.5 KV
ESD Capability, CDM Model 1250 V

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 4

CM6800T (Turbo-Speed PFC+Green PWM)

μ

μ

μ

μ

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

ELECTRICAL CHARACTERISTICS:

Unless otherwise stated, these specifications apply Vcc=+14V, RT = 5.88 kΩ, CT = 1000pF, TA=Operating Temperature

Range (Note 1)

CM6800T Symbol Parameter Test Conditions

Unit

Min. Typ. Max.

Clean Digital PFC Brown Out

VRMS Threshold High

VRMS Threshold Low

Hysteresis 710 760 mV

Voltage Error Amplifier (gmv)

Input Voltage Range 0 3 V

Transconductance

Feedback Reference Voltage 2.45 2.52 2.58 V

Input Bias Current Note 2 -1.0 -0.05

Output High Voltage 5.8 6.0 V

Output Low Voltage 0.1 0.4 V

Sink Current

Room Temperature=25℃

Room Temperature=25℃

= V

V

NONINV

Overdrive Voltage = 100mV @ T=25℃

, VEAO = 3.35V @ T=25℃

INV

1.70 1.78 1.86 V

0.98 1.03 1.08 V

25 40 60

-60 -40 -28

mho

A

A

Source Current

Open Loop Gain Guaranteed by design 30 40 dB

Power Supply Rejection Ratio 11V < VCC < 16.5V 60 75 dB

Overdrive Voltage = 100mV @ T=25℃

0.9 3 7

A

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 5

CM6800T (Turbo-Speed PFC+Green PWM)

μ

μ

μ

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

ELECTRICAL CHARACTERISTICS:

(Conti.) Unless otherwise stated, these specifications apply Vcc=+14V, RT = 5.88 kΩ, CT = 1000pF,
T

=Operating Temperature Range (Note 1)

A

CM6800T

Symbol Parameter Test Conditions

Min. Typ. Max.

Current Error Amplifier (gmi)

Unit

Input Voltage Range (Isense pin)

= V

V

Transconductance

Input Offset Voltage VEAO=0V, IAC is open

Output High Voltage

Output Low Voltage

Sink Current

Source Current

Open Loop Gain DC Gain 30 40 dB

Power Supply Rejection Ratio 11V < VCC < 16.5V 60 75 dB

PFC OVP Comparator

Threshold Voltage 2.60 2.75 2.85 V

Hysteresis 130 220 mV

PFC Green Power Detect Comparator

NONINV

= -0.5V, IEAO = 1.5V @ T=25℃

I

SENSE

= +0.5V, IEAO = 4.0V @ T=25℃

I

SENSE

, IEAO = 1.5V @ T=25℃

INV

-1.2 0.7 V

50 67 85

-10 50 mV

6.8 7.4 7.7 V

0.1 0.4 V

-40 -34 -28

27 32 37

mho

A

A

Veao Threshold Voltage 0.14 0.26 0.4 V

Tri-Fault Detect

Fault Detect HIGH 2.70 2.85 3.0 V

Time to Fault Detect HIGH V

Fault Detect Low 0.1 0.28 0.4 V

PFC I

Comparator

LIMIT

Threshold Voltage -1.35 -1.25 -1.15 V

(PFCI

Output)

Delay to Output (Note 4) Overdrive Voltage = -100mV 700 ns

– Gain Modulator

LIMIT

FB=VFAULT DETECT LOW

=OPEN, 470pF from VFB to GND

V

FB

to

2 4 ms

300 450 mV

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 6

CM6800T (Turbo-Speed PFC+Green PWM)

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

ELECTRICAL CHARACTERISTICS:

(Conti.) Unless otherwise stated, these specifications apply Vcc=+14V, RT = 5.88 kΩ, CT = 1000pF,
T

=Operating Temperature Range (Note 1)

A

Symbol Parameter Test Conditions

CM6800T

Unit

Min. Typ. Max.

DC I

Comparator

LIMIT

Threshold Voltage 0.92 1.0 1.08 V

Delay to Output (Note 4) Overdrive Voltage = 100mV 700 ns

DC to DC PWM Brown Out Comparator

OK Threshold Voltage 2.1 2.3 2.5 V

Hysteresis 880 950 1000 mV

GAIN Modulator

Gain1 (Note 3)

Gain2 (Note )3

Gain3 (Note 3)

Gain4 (Note 3)

Bandwidth (Note 4)

Output Voltage = Rmul *

(I

SENSE-IOFFSET

)

= 20μA, V

I

AC

T=25℃ SS<VREF

= 20μA, V

I

AC

2.375V @ T=25℃ SS<VREF

= 20μA, V

I

AC

T=25℃ SS<VREF

= 20μA, V

I

AC

@ T=25℃ SS<VREF

I

= 50μA, V

AC

SS<VREF

=1.125, VFB = 2.375V @

RMS

= 1.45588V, VFB=

RMS

=2.91V, VFB = 2.375V @

RMS

= 3.44V, VFB = 2.375V

RMS

= 40μA

I

AC

= 1.125V, VFB = 2V

RMS

4.4 5.5 6.6

4 5 6

1.2 1.5 1.8

0.9 1.05 1.3

1 MHz

0.74 0.8 0.86 V

Oscillator (Measuring fpfc)

= 5.88 kΩ, CT = 1000pF, TA = 25℃

R

Initial fpfc Accuracy 1

T

64 68 72 kHz

IAC=0uA

Voltage Stability 11V < VCC < 16.5V 2 %

Temperature Stability 2 %

Total Variation Line, Temp 60 75 kHz

Ramp Valley to Peak Voltage VEAO=6V and IAC=20uA 2.5 V

PFC Dead Time (Note 4) 550 950 ns

CT Discharge Current V

RAMP2

= 0V, V

= 2.5V 10 11 12 mA

RAMP1

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 7

CM6800T (Turbo-Speed PFC+Green PWM)

μ

μ

μ

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

ELECTRICAL CHARACTERISTICS (Conti.) Unless otherwise stated, these specifications apply

Vcc=+14V, R

Symbol Parameter Test Conditions

Reference

Output Voltage

Line Regulation

Temperature Stability 0.4 %
Total Variation Line, Load, Temp 7.3 7.7 V

Long Term Stability

PFC

Minimum Duty Cycle IEAO > 4.5V 0 %
Maximum Duty Cycle V

Rise/Fall Time (Note 4)

PWM

Duty Cycle Range 0-49.5 0-50 %

Rise/Fall Time (Note 4) CL = 100pF 50 ns

PWM Comparator Level Shift

Soft Start

Soft Start Current

Soft Start Discharge Current Vrms=0.926V, Soft Start=8V 0.5 3 6

Supply

Start-Up Current

Operating Current 14V, CL = 0 2.5 3.5 mA
Turn-on Undervoltage Lockout Threshold CM6800T 12.35 12.85 13.65 V
Turn-off Undervoltage Lockout Threshold CM6800T 9.75 10.25 V
Turn-off Undervoltage Lockout Hysteresis CM6800T 2.8 2.95 3.1 V

Shunt Regulator (VCC zener)

= 5.88 kΩ, CT = 1000pF, TA=Operating Temperature Range (Note 1)

T

Load Regulation

Output Low Rdson

Output High Rdson

Output Low Rdson

Output High Rdson

CM6800T

Min. Typ. Max.

= -45℃~85℃, I(VREF) = 0~3.5mA

T

A

11V < V

< 16.5V@ T=25℃

CC

VCC=10.5V,0mA < I(VREF) < 2mA;
@ T=25℃

VCC=14V,0mA < I(VREF) < 3.5mA;
TA = -40℃~85℃

= 125℃, 1000HRs

T

J

< 1.2V 93 95 %

IEAO

= -20mA @ T=25℃

I

OUT

= -100mA @ T=25℃

I

OUT

= 10mA, VCC = 9V @ T=25℃

I

OUT

= 20mA @ T=25℃

I

OUT

= 100mA @ T=25℃

I

OUT

= 100pF @ T=25℃

C

L

= -20mA @ T=25℃

I

OUT

= -100mA @ T=25℃

I

OUT

I

= 10mA, VCC = 9V 0.5 1 V

OUT

= 20mA @ T=25℃

I

OUT

= 100mA @ T=25℃

I

OUT

@ T=25℃

Room Temperature=25℃

= 12V, CL = 0 @ T=25℃

V

CC

7.3 7.5 7.7 V

3 5 mV

25 50 mV

25 50 mV

5 25 mV

13 18 ohm

18 ohm

0.5 1 V

24 30 ohm

40 ohm

50 ns

13 18 ohm

18 ohm

26.5 40 ohm

40 ohm

1.6 1.8 2 V

7 10 12

50 65

Unit

Zener Threshold Voltage Apply VCC with Iop=20mA 16.15 17 17.85 V

A

A

A

Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.

Note 2: Includes all bias currents to other circuits connected to the V

Note 3: Gain ~ K x 5.3V; K = (I

SENSE

– I

) x [IAC (VEAO – 0.7)]-1; VEAO

OFFSET

FB

pin.

MAX

= 6V

Note 4: Guaranteed by design, not 100% production test.

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 8

CM6800T (Turbo-Speed PFC+Green PWM)

http://www.championmicro.com.tw EPA/85+ PFC+PWM COMBO CONTROLLER

Design for High Efficient Power Supply

TYPICAL PERFORMANCE CHARACTERISTIC:

PFC Soft Diagram :

Dynamic Soft PFC Performance @ Vin=110 Vac

Ch1 is 380V bulk cap voltage which is 100V/div.
Ch3 is Input Line Current which is 1A/div.
Input Line Voltage (110 Vac) was turned off for 40mS before reaching PWM Brownout which is 209Vdc. When the bulk cap voltage goes below
209V, the system will reset the PWM soft start. The result of the CM6800T Input Line Current has a clean Off and softly On even the system
does not reset PWM soft-start.

Dynamic Soft PFC Performance @ Vin=220 Vac

Ch1 is 380V bulk cap voltage which is 100V/div.
Ch3 is Input Line Current which is 1A/div.
Input Line Voltage (220 Vac) was turned off for 40mS before reaching PWM Brownout which is 209Vdc when Bulk cap voltage drops below
209V. When the bulk cap voltage goes below 209V, the system will reset the PWM soft start. The result of the CM6800T Input Line Current has
a clean Off and softly On even the system does not reset itself. The first peak current at the beginning of the On time is the inrush current.

2010/08/03 Rev. 1.2 Champion Microelectronic Corporation 9