Champion CM6800GIP, CM6800GIS, CM6800XIP, CM6800XIS Schematics

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

μ

GENERAL DESCRIPTION

The CM6800 is a controller for power factor corrected,

switched mode power suppliers. Power Factor Correction

(PFC) allows the use of smaller, lower cost bulk

capacitors, reduces power line loading and stress on the

switching FETs, and results in a power supply that fully

compiles with IEC-1000-3-2 specifications. Intended as a

BiCMOS version of the industry-standard ML4824,

CM6800 includes circuits for the implementation of leading

edge, average current, “boost” type power factor

correction and a trailing edge, pulse width modulator

(PWM). Gate-driver with 1A capabilities minimizes the

need for external driver circuits. Low power requirements

improve efficiency and reduce component costs.

An over-voltage comparator shuts down the PFC section

in the event of a sudden decrease in load. The PFC

section also includes peak current limiting and input

voltage brownout protection. The PWM section can be

operated in current or voltage mode, at up to 250kHz, and

includes an accurate 50% duty cycle limit to prevent

transformer saturation.

CM6800 includes an additional folded-back current limit

for PWM section to provide short circuit protection

function.

FEATURES

 Patent Number #5,565,761, #5,747,977, #5,742,151,

#5,804,950, #5,798,635

 Pin to pin compatible with ML4800 and FAN4800

 Additional folded-back current limit for PWM section.

 23V Bi-CMOS process

 VIN OK turn on PWM at 2.5V instead of 1.5V

 Internally synchronized leading edge PFC and trailing

edge PWM in one IC

 Slew rate enhanced transconductance error amplifier for

ultra-fast PFC response

 Low start-up current (100

A typ.)

 Low operating current (3.0mA type.)

 Low total harmonic distortion, high PF

 Reduces ripple current in the storage capacitor between

the PFC and PWM sections

 Average current, continuous or discontinuous boost

leading edge PFC

 VCC OVP Comparator, Low Power Detect Comparator

 PWM configurable for current mode or voltage mode

operation

 Current fed gain modulator for improved noise immunity

 Brown-out control, over-voltage protection, UVLO, and

soft start, and Reference OK

CM6800

APPLICATIONS

PIN CONFIGURATION

 Desktop PC Power Supply

 Internet Server 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)

Top View

1

2

3

4

5

6

7

8

IEAO

IAC

ISENSE

VRMS

SS

VDC

RAMP1

RAMP2

PFC OUT

PWM OUT

DC ILIMIT

VEAO

VFB

VREF

VCC

GND

16

15

14

13

12

11

10

9

2008/10/23 Rev. 2.1 Champion Microelectronic Corporation Page 1

CM6800

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

PIN DESCRIPTION

Pin No. Symbol Description

1 IEAO PFC transconductance current error amplifier output 0 4.25 V

2 IAC PFC gain control reference input 0 1 mA

Operating Voltage

Min. Typ. Max. Unit

3 I

4 V

5 SS Connection point for the PWM soft start capacitor 0 8 V

6

7

8 RAMP 2

9 DC I

10 GND Ground

11 PWM OUT PWM driver output 0 VCC V

Current sense input to the PFC current limit comparator -5 0.7 V

SENSE

Input for PFC RMS line voltage compensation 0 6 V

RMS

VDC

RAMP 1

(RTCT)

(PWM RAMP)

LIMIT

PWM voltage feedback input 0 8 V

Oscillator timing node; timing set by RT CT 1.2 3.9 V

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

PWM current limit comparator input 0 1 V

0 6 V

12 PFC OUT PFC driver output 0 VCC V

13 VCC Positive supply 10 15 18 V

14 V

15 VFB PFC transconductance voltage error amplifier input 0 2.5 3 V

16 VEAO

Buffered output for the internal 7.5V reference 7.5 V

REF

PFC transconductance voltage error amplifier output

0 6 V

2008/10/23 Rev. 2.1 Champion Microelectronic Corporation Page 2

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

BLOCK DIAGRAM (CM6800)

16

3.5K

GMi

+

-

IEAO

.

OSCILLATOR

15

2

4

3

7

8

VFB

IAC

VRMS

ISENSE

RAMP1

RAMP2

2.5V

GMv

-

+

VEAO

0.3V

.

GAIN

MODULATOR

350

SW SPST

-

+

LOW POWER DETECT

3.5K

1

VCC

17.9V

0.5V

PFC CMP

+

-

VCC OVP

+

-

TRI-FAULT

-

+

DUTY CYCLE

2.75V

LIMIT

-1V

PFC OVP

+

.

-

+

-

PFC ILIMIT

PWM DUTY

SRQ

REFERENCE

Q

CM6800

13

VCC

7.5V

CLK

PFCOUT

PWMOUT

VREF

POWER FACTOR CORRECTOR

MPPFC

VCC

PFC OUT

MNPFC

GND

14

12

PWM

-

CMP

+

SS CMP

-

+

VDC

6

SS

5

DC ILIMIT

9

Vcc

20uA

VREF

350

1.5V

SW SPST

SW SPST SW SPST

ORDERING INFORMATION

Part Number Temperature Range Package

CM6800GIP

CM6800GIS

CM6800XIP*

CM6800XIS*

*Note:

G : Suffix for Pb Free Product

X : Suffix for Halogen Free Product

VFB

-

2.45V

+

VIN OK

-40℃ to 125℃

VCC

MPPWM

SRQ

.

1.0V

-

+

DC ILIMIT

SRQ

VCC

Q

UVLO

PWM OUT

MNPWM

GND

PULSE WIDTH MODULATOR

GND

11

10

16-Pin PDIP (P16)

16-Pin Wide SOP (S16)

16-Pin PDIP (P16)

16-Pin Wide SOP (S16)

2008/10/23 Rev. 2.1 Champion Microelectronic Corporation Page 3

CM6800

μ

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

ABSOLUTE MAXIMUM RATINGS

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

Parameter Min. Max. Units

VCC 20 V IEAO 0 7.5 V I

Voltage -5 0.7 V

SENSE

PFC OUT

PWMOUT

Voltage on Any Other Pin I

10 mA

REF

IAC Input Current 1 mA Peak PFC OUT Current, Source or Sink 1 A Peak PWM OUT Current, Source or Sink 1 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℃

ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply Vcc=+15V, R

= 30.16kΩ, C

Symbol Parameter Test Conditions

Input Voltage Range 0 6 V

Transconductance

Feedback Reference Voltage 2.45 2.5 2.55 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 VFB = 3V, VEAO = 6V -35 -20

Source Current VFB = 1.5V, VEAO = 1.5V 30 40

Open Loop Gain 50 60 dB

Power Supply Rejection Ratio 11V < VCC < 16.5V 50 60 dB

Input Voltage Range -1.5 0.7 V

Transconductance

Output High Voltage 4.0 4.25 V

Output Low Voltage 1.0 1.2 V

2008/10/23 Rev. 2.1 Champion Microelectronic Corporation Page 4

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

T

Voltage Error Amplifier (gmv)

V

= V

NONINV

Current Error Amplifier (gmi)

V

NONINV

Input Offset Voltage -25 25 mV

INV

at room temp

= V

INV

at room temp

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

GND – 0.3 VCC + 0.3 V

800 mW

, VEAO = 3.75V

80

105

CM6800

Min. Typ. Max.

50 70 90

50 85 100

J

℃

℃/W

Unit

mho

A

mho

T

CM6800

μ

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

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

Vcc=+15V, RT = 30.16kΩ, CT =1000pF, TA=Operating Temperature Range (Note 1)

Symbol Parameter Test Conditions

Sink Current I

Source Current I

= +0.5V, IEAO = 4.0V -65 -35

SENSE

= -0.5V, IEAO = 1.5V 35 75

SENSE

Min. Typ. Max.

Open Loop Gain 60 70 dB

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

PFC OVP Comparator

Threshold Voltage 2.70 2.77 2.85 V

Hysteresis 230 290 mV

Low Power Detect Comparator

Threshold Voltage 0.2 0.3 0.4 V

VCC OVP Comparator

Threshold Voltage 17.5 17.9 18.5 V

Hysteresis 1.40 1.5 1.65 V

Tri-Fault Detect

Fault Detect HIGH 2.65 2.75 2.85 V

Time to Fault Detect HIGH VFB=V

FAULT DETECT LOW

V

=OPEN.470pF from VFB to GND

FB

to

2 4 ms

Fault Detect LOW 0.4 0.5 0.6 V

PFC I

Comparator

LIMIT

Threshold Voltage -1.10 -1.00 -0.90 V

(PFC I

LIMIT VTH

Output)

– Gain Modulator

20 100 mV

Delay to Output (Note 4) Overdrive Voltage = -100mV 250 ns

DC I

Comparator

LIMIT

Threshold Voltage 0.95 1.0 1.05 V

Delay to Output (Note 4) Overdrive Voltage = 100mV 250 ns

VIN OK Comparator

OK Threshold Voltage 2.35 2.45 2.55 V

Hysteresis 0.95 1.2 1.4 V

GAIN Modulator

Gain (Note 3)

Bandwidth

Output Voltage =

3.5K*(I

SENSE-IOFFSET

= 100μA, V

I

AC

at room temp

= 100μA, V

I

AC

at room temp

= 150μA, V

I

AC

at room temp

= 300μA, V

I

AC

at room temp I

AC

I

= 250μA, V

AC

)

=0, VFB = 1V

RMS

= 1.1V, VFB = 1V

RMS

= 1.8V, VFB = 1V

RMS

= 3.3V, VFB = 1V

RMS

= 100μA

= 1.1V, VFB = 1V

RMS

0.70 0.84 0.95

1.80 2.00 2.20

0.90 1.00 1.10

0.25 0.32 0.40

0.84 0.90 0.95 V

CM6800

10 MHz

Unit

A

2008/10/23 Rev. 2.1 Champion Microelectronic Corporation Page 5

CM6800

μ

LOW START-UP CURRENT PFC/PWM CONTROLLER COMBO

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

Vcc=+15V, RT = 30.16kΩ, CT =1000pF, TA=Operating Temperature Range (Note 1)

Symbol Parameter Test Conditions

Min. Typ. Max.

Oscillator

Initial Accuracy

A

60 70 kHz

= 25℃

T

Voltage Stability 11V < VCC < 16.5V 1 %

Temperature Stability 2 %

Total Variation Line, Temp 52 74 kHz

Ramp Valley to Peak Voltage 2.5 V

PFC Dead Time (Note 4) 360 640 ns

CT Discharge Current V

RAMP2

= 0V, V

= 2.5V 6.5 15 mA

RAMP1

Reference

Output Voltage

= 25℃, I(V

T

A

) = 1mA

REF

7.4 7.5 7.6 V

Line Regulation 11V < VCC < 16.5V 10 25 mV

Load Regulation

0mA < I(V

) < 7mA; TA = 0℃~70℃

REF

) < 5mA; TA = -40℃~85℃

REF

Temperature Stability 0.4 %

Total Variation Line, Load, Temp 7.35 7.65 V

= 125℃, 1000HRs

T

Long Term Stability

J

PFC

Minimum Duty Cycle V

Maximum Duty Cycle V

I

Output Low Rdson

I

Output High Rdson

I

OUT

= -20mA at room temp 15 ohm

OUT

= -100mA at room temp 15 ohm

OUT

= 10mA, VCC = 9V at room temp 0.4 0.8 V

= 20mA at room temp 15 20 ohm

OUT

I

= 100mA at room temp 15 20 ohm

OUT

> 4.0V 0 %

IEAO

< 1.2V 92 95 %

IEAO

Rise/Fall Time (Note 4) CL = 1000pF 50 ns

PWM

Duty Cycle Range 0-43 0-47 0-49 %

I

Output Low Rdson

I

Output High Rdson

= -20mA at room temp 15 ohm

OUT

= -100mA at room temp 15 ohm

OUT

I

= 10mA, VCC = 9V 0.4 0.8 V

OUT

= 20mA at room temp 15 20 ohm

OUT

I

= 100mA at room temp 15 20 ohm

OUT

Rise/Fall Time (Note 4) CL = 1000pF 50 ns

PWM Comparator Level Shift 1.4 1.55 1.7 V

Supply

Start-Up Current VCC = 12V, CL = 0 at room temp 100 150

Operating Current 14V, CL = 0 3.0 7.0 mA

Undervoltage Lockout Threshold CM6800 12.74 13 13.26 V

Undervoltage Lockout Hysteresis CM6800 2.85 3.0 3.15 V

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 5.375V; K = (I

SENSE

– I

) x [IAC (VEAO – 0.625)]-1; VEAO

OFFSET

FB

pin.

MAX

= 6V

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

CM6800

Unit

10 20 mV

5 25 mV

A

2008/10/23 Rev. 2.1 Champion Microelectronic Corporation Page 6