UCC2819, UCC3819

PROGRAMMABLE OUTPUT

POWER FACTOR PREREGULATOR

SLUS482B - APRIL 2001 − REVISED DECEMBER 2004

1

www.ti.com

Power Factor

Boost Topology)

description

The UCC2819/UCC3819 provides all the functions necessary for active power factor corrected preregulators.

The controller achieves near unity power factor by shaping the ac-input line current waveform to correspond

to that of the ac-input line voltage. Average current mode control maintains stable, low distortion sinusoidal line

current.

Designed in Texas Instrument’s BiCMOS process, the UCC3819 offers new features such as lower start-up

current, lower power dissipation, overvoltage protection, a shunt UVLO detect circuitry and a leading-edge

modulation technique to reduce ripple current in the bulk capacitor.

The UCC3819 allows the output voltage to be programmed by bringing out the error amplifier noninverting input.

Available in the 16-pin D, DW, N, and PW packages.

block diagram

UDG-01009

VREF

9

2

16

1

15

10

5

4

DRVOUT

GND

CAI

VCC

OVP/EN

VAOUT

1.9 V

PKLMT

7.5 V

REFERENCE

UVLO

10.2 V/9.7 V

VCC

3

OSCILLATOR

12

RT

14

CT

SQ

R

PWM

LATCH

+

−

PWM

CAOUT

+

−

+

−

+

−

VOLTAGE

ERROR AMP

8.0 V

7

11

VSENSE

VFF

8

IAC

6

MOUT

MIRROR

2:1

X

2

+

−

ENABLE

OVP

÷

X

X

MULT

OSC

CLK

CLK

CURRENT

AMP

+

−

0.33 V

ZERO POWER

R

+

−

13

VAI

Copyright

 2004, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

D, DW, N, and PW PACKAGES

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

GND

PKLMT

CAOUT

CAI

MOUT

IAC

VAOUT

VFF

DRVOUT

VCC

CT

VAI

RT

VSENSE

OVP/EN

VREF