UNISONIC TECHNOLOGIES CO., LTD

UC3844/45

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

1 of 6

Copyright © 2012 Unisonic Technologies Co., Ltd

QW-R103-010.E

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 thresholds

FEATURES

* Operation output switching frequency up to 500 kHz

* Output deadtime adjustable from 50% to 70%

* 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

UC3844L-S08-R

UC3844G-S08-R

SOP-8

Tape Reel

UC3844L-S08-T

UC3844G-S08-T

SOP-8

Tube

UC3845L-D08-T

UC3845G-D08-T

DIP-8

Tube

UC3845L-S08-R

UC3845G-S08-R

SOP-8

Tape Reel

UC3845L-S08-T

UC3845G-S08-T

SOP-8

Tube