CM6903A

2008/10/20 Rev1.4

Champion Microelectronic Corporation

Page 3

BLOCK DIAGRAM

2.5V

..

fpfc=

R1A

100K

2

1

R1C

5.1K

2

1

9

IAC

-1V

SS

17.9V

..

CM6903A

0.5V

VCC OVP

+

-

.

-

PFC ILIMIT

+

-

.

VIN OK

+

-

.

+

FAULTB

2.45V

..

gmv

-

+

.

PFCCLKB

VREF OK

16.4V

67.5KHz

PFC OVP

+

-

.

-

VREFOK

PWM CMP

+

-

.

-

2.75V

0.75V

RAMP

ISENSEAMP

2

VCC

PWMCLK

10ms

PWM CLK

S

OR

Q

Q

R

fpwm=

2.5V

4

PFCOUT

VCC

5

GND

7

VEAO

6

ISENSE

VCC

1.5V

PFCCLKB

PWMCLK

.

.

VFB

VREF OK

1

DCILIMIT

OS

R

Q

Q

R

R

8

VFB

PFC CMP

+

-

.

Tri-Fault Detect

+

-

.

3

PWMOUT

R1B

400K

2

1

67.5KHz

UVLO

UVLO

ABSOLUTE MAXIMUM RATINGS

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

Parameter

Min.

Max.

Units

20

V

IAC (after start up)

GND-0.3

1.0

V

-5

0.7

V

PFC OUT

GND – 0.3

VCC + 0.3

V

PWM OUT

GND – 0.3

VCC + 0.3

V

VEAO

0

6.3

V

Voltage on Any Other Pin

GND – 0.3

VCC + 0.3

V

40

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

μJ

Junction Temperature

150

℃

Storage Temperature Range

-65

150

℃

Operating Temperature Range

-40

125

℃

Lead Temperature (Soldering, 10 sec)

260

℃

80

℃

/W