UNISONIC TECHNOLOGIES CO., LTD

UL22

Preliminary

CMOS IC

www.unisonic.com.tw

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Copyright © 2018 Unisonic Technologies Co., Ltd

QW-R125-088.a

LED DRIVER CONTROLLER



DESCRIPTION

Featured Device, UTC UL22, is a PWM controller with

innovative Free-Dimming

of the two strings of LEDs by an ON/OFF AC wall switch and

provides a cost effective solution for light control. It supports

power-factor-correction function in applications.

UTC UL22 provides several protection features. It includes a

cycle-by-cycle current limit to the power switch; over-current

protection. In addition, the driver output (DRV) voltage is clamped

for driving the external power MOSFET effectively and safely. The

controller also features an internal over-temperature protection.



FEATURES

* Free-Dimming

* Proprietary technology using ON/OFF wall switch to select one of

the two LED channels

* Supports high-side Buck, Buck-Boost and Flyback topologies

* High power factor with Discontinue-Current-Mode (DCM)

control

* Low start-up current and operating current to maximize

conversion efficiency

* Under-voltage lockout (UVLO) with hysteresis

* Provides complete protection functions

-Maximum gate driver output clamp

　

　

-Cycle-by-cycle current limit

　

-LEDs Over-Current Protection

　

-LEDs Open-Loop Protection

　

-LEDs Short-Circuit Protection

　

-Internal Over-Temperature Protection

HSOP-8



ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

UL22L-SH2-R

UL22G-SH2-R

HSOP-8

Tape Reel