UNISONIC TECHNOLOGIES CO., LTD

UC3844/45

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2015 Unisonic Technologies Co., Ltd

QW-R103-010.H

HIGH PERFORMANCE

CURRENT MODE PWM

CONTROLLERS



DESCRIPTION

The UTC UC3844/3845 are high performance fixed frequency

current mode controllers that specifically designed for Off-Line and

DC to DC converter applications with minimal external parts count.

The differences between UC3844 and UC3845 are the

maximum duty cycle ranges and under-voltage lockout thresholds.

The UC3844 ideally suited to off-line applications with UVLO



FEATURES

* Operation output switching frequency up to 500 kHz

* Automatic feed forward compensation

* Latching PWM for cycle-by-cycle current limiting

* High current totem pole output

* Internally trimmed reference with under voltage lockout

* UVLO with hysteresis

* Low startup and operating current



ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

UC3844L-D08-T

UC3844G-D08-T

DIP-8

Tube

-

UC3844G-S08-R

SOP-8

Tape Reel

UC3845L-D08-T

UC3845G-D08-T

DIP-8

Tube

-

UC3845G-S08-R

SOP-8

Tape Reel