UNISONIC TECHNOLOGIES CO., LTD

UPSR100

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 7

Copyright © 2015 Unisonic Technologies Co., Ltd

QW-R502-946.d

SOP-8

HIGH PRECISION CC/CV

PRIMARY SIDE REGULATOR



DESCRIPTION

The UTC UPSR100 is a primary control unit for switch mode

charger and adapter applications. The controlled variable is

transferred by an auxiliary winding from the secondary to the

primary side. The device uses Pulse Frequency Modulation (PFM)

method to build discontinuous conduction mode (DCM) flyback

power supplies.

The UTC UPSR100 operates in primary-side sensing and

regulation. Opto-coupler and TL431 could be eliminated. It also

eliminates the need of loop compensation circuitry while

maintaining stability.

The UTC UPSR100 achieves high precision CV/CC regulation

and high power efficiency. It offers comprehensive protection

coverage with auto-recovery features including Cycle-by-cycle

current limiting, output over voltage protection, feedback loop open

under voltage lockout, etc.



FEATURES

* ±5% constant voltage regulation at universal AC input

* High precision constant current regulation at universal AC input

* Primary side control without TL431 and opto-coupler

* Programmable CV and CC regulation

* Eliminates control loop compensation circuitry

* Flyback topology in DCM operation

* Random frequency modulation to reduce system EMI

* Driver BJT switch

* Built-in leading edge blanking

* Built-in primary winding inductance

compensation

* Open circuit protection

* Over voltage protection

* Short circuit protection



ORDERING INFORMATION

Ordering Number

Package

Packing

UPSR100G-S08-R

SOP-8

Tape Reel