UNISONIC TECHNOLOGIES CO., LTD

UC3846

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

1 of 9

Copyright © 2013 Unisonic Technologies Co., Ltd

QW-R103-061. C

CURRENT MODE PWM

CONTROLLER



DESCRIPTION

The UTC UC3846 control IC offers all necessary features for

accomplishment of fixed frequency, current mode control functions,

however it contains the least external parts. The performance of this

technique is superior to the others in better line regulation,

enhanced load response characteristics while designing a simpler

and easier control loop for design. It owns topological advantages of

inherent pulse-by-pulse current limiting, automatic symmetry

correction for push-pull converters, and the ability to parallel “power

modules" for equal current sharing.

Protection loop includes soft start, built-in under-voltage lockout

and programmable current limit. The shutdown

circuitry can

provide either a complete shutdown with automatic restart or the

supply off-latch.

In addition, many other features can also be available, including

fully latched operation, double pulse suppression, deadline adjust,

and a ±1% trimmed bandgap reference.

The UTC UC3846 features low outputs in the OFF state.



FEATURES

DIP-16

SOP-16

SOP-16W

* Built-in under-voltage lockout

* Soft start

* Shutdown function

* 500kHZ operation

* Feed forward compensation

* ±1% bandgap reference

* Programmable pulse-by-pulse current limiting

* Improved load response characteristics

* Parallel operation capability for modular power systems

* Differential current sense amplifier with wide common mode

range

* Double pulse suppression

* 500mA (Peak) totem-pole outputs

* Automatic symmetry correction in push-pull configuration



ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

UC3846L-D16-T

UC3846G-D16-T

DIP-16

Tube

UC3846L-S16-T

UC3846G-S16-T

SOP-16

Tube

UC3846L-S16-R

UC3846G-S16-R

SOP-16

Tape Reel

UC3846L-S16W-T

UC3846G-S16W-T

SOP-16W

Tube

UC3846L-S16W-R

UC3846G-S16W-R

SOP-16W

Tape Reel