1

FEATURES

D PACKAGE

(TOP VIEW)

1

2

3

4

8

7

6

5

COMP

OUTPUT

GND

DESCRIPTION/ORDERING INFORMATION

UC2843A-Q1

CURRENT-MODE PWM CONTROLLER

• Qualified for Automotive Applications

• Extended Temperature Performance of

–40

°C to 125°C

• Optimized for Off-Line and DC-to-DC

Converters

• Low Start-Up Current (<0.5 mA)

• Trimmed Oscillator-Discharge Current

• Automatic Feed-Forward Compensation

• Pulse-by-Pulse Current Limiting

• Enhanced Load-Response Characteristics

• Under-Voltage Lockout With Hysteresis

• Double-Pulse Suppression

• High-Current Totem-Pole Output

• Internally Trimmed Bandgap Reference

• 500-kHz Operation

• Low R

The UC2843A control IC is a pin-for-pin compatible improved version of the UC2843. Providing the necessary

features to control current mode switched mode power supplies, this device has the following improved features.

Start up current is specified to be less than 0.5 mA. Oscillator discharge is trimmed to 8.3 mA. During

MAXIMUM DUTY

PART NUMBER

UVLO ON

UVLO OFF

CYCLE

UC2843A

8.5 V

7.9 V

<100%

ORDERABLE PART NUMBER

TOP-SIDE MARKING

–40

°C to 125°C

SOIC-8 – D8

Reel of 2500

UC2843AQD8RQ1

UC2843AQ

(1)

For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI

web site at www.ti.com.

(2)

Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at

www.ti.com/sc/package.

1

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.

PRODUCTION DATA information is current as of publication date.

Copyright © 2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.