UNI SONI C TECHNOLOGI ES CO., LTD

UPSRB04

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 7

Copyright © 2018 Unisonic Technologies Co., Ltd

H I GH PRECI SI ON CC/CV

PRI M ARY SI DE SWI T CH I N G

REGU LAT OR



DESCRI PT I ON

The UTC UPSRB04 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 UPSRB04 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 UPSRB04 achieves high precision CV/CC regulation

and high power efficiency. It offers comprehensive protection

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

protection, feedback loop open protection, short circuit protection,



FEAT U RES

* ±5% constant voltage regulation at universal AC input

* Primary side control without TL431 and opto-coupler

* High precision constant current regulation at universal AC input

* 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

* Programmable cable drop compensation

* Built-in leading edge blanking

* Built-in primary winding inductance

compensation

* Open circuit protection

* Output over voltage protection

* Short circuit protection

* Over temperature protection



ORDERI N G I N FORM AT I ON

Ordering Number

Lead Free

Halogen Free

Package

Packing

UPSRB04L-AF5-R

UPSRB04G-AF5-R

SOT-25

Tape Reel