UNISONIC TECHNOLOGIES CO., LTD

USL250X

CMOS IC

www.unisonic.com.tw

1 of 8

Copyright © 2018 Unisonic Technologies Co., Ltd

QW-R103-155.B

HIGH PRECISION

NON-ISOLATED POWER

SWITCH



DESCRIPTION

USL250X

offers comprehensive protection coverage with

auto-recovery features including LED string short circuit protection,

under voltage lockout (UVLO), over temperature protection(OTP),

etc.

Cycle-by-Cycle current limiting is offered in USL250X. The

switch current is detected by a sense resistor into the CS pin. An

internal leading edge blanking circuit chops off the sensed voltage

spike at initial power MOSFET on state so that the external RC

filtering on sense input is no longer needed.

It is a high current precision, non-isolated power switch for LED

lighting. It works under transition mode. The LED lighting system

design by eliminating the auxiliary winding inductance and works

under low current. A 500V power switch is also integrated into the

device. The LED current can be adjusted externally by the sense

resistor Rs at CS pin and high precision constant current

regulation is realized.



FEATURES

DIP-8

SOP-8

* High precision constant current regulation at universal

AC input

* Support system application with PF>0.7 and no flicking

* Sense and supply without auxiliary winding inductance

* Low system cost and high efficiency

* Low operation current

* Programmable CC regulation

* Transition mode operation

* LED string short circuit protection

* Cycle-by-Cycle current limiting

* Built-in Leading Edge Blanking (LEB)

* Over temperature protection (OTP)



ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

USL2500L-S08-R

USL2500G-S08-R

SOP-8

Tape Reel

USL2502L-D08-T

USL2502G-D08-T

DIP-8

Tube