UC1846-DIE

www.ti.com

SGLS409 – NOVEMBER 2012

CURRENT-MODE PWM CONTROLLER

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FEATURES

•

Automatic Feed-Forward Compensation

•

Differential Current-Sense Amplifier With Wide

Common-Mode Range

•

Programmable Pulse-by-Pulse Current

Limiting

•

Double Pulse Suppression

•

Automatic Symmetry Correction in Push-Pull

•

Undervoltage Lockout

Configuration

•

Soft-Start Capability

•

Enhanced Load-Response Characteristics

•

Shutdown Terminal

•

Parallel Operation Capability for Modular

Power Systems

DESCRIPTION

The UC1846 control IC provides all of the necessary features to implement fixed-frequency, current-mode control

schemes, while maintaining a minimum external parts count. The superior performance of this technique can be

measured in improved line regulation, enhanced load-response characteristics, and a simpler, easier-to-design

control loop. Topological advantages include inherent pulse-by-pulse current-limiting capability, automatic

symmetry correction for push-pull converters, and the ability to parallel power modules, while maintaining equal

current sharing.

Protection circuitry includes built-in undervoltage lockout and programmable current limit, in addition to soft-start

capability. A shutdown function is also available, which can initiate either a complete shutdown with automatic

restart or latch the supply off.

Other features include fully latched operation, double pulse suppression and deadline adjust capability.

The UC1846 features low outputs in the OFF state.

PACKAGE

PRODUCT

PACKAGE

ORDERABLE PART NUMBER

PACKAGE QUANTITY

DESIGNATOR

UC1846VTD1

100

UC1846

TD

UC1846VTD2

10

(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)

Processing is per the Texas Instruments commercial production baseline and is in compliance with the Texas Instruments Quality

Control System in effect at the time of manufacture. Electrical screening consists of DC parametric and functional testing at room

temperature only. Unless otherwise specified by Texas Instruments AC performance and performance over temperature is not

warranted. Visual Inspection is performed in accordance with MIL-STD-883 Test Method 2010 Condition B at 75X minimum.

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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 © 2012, 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.