UNI SONI C TECHNOLOGI ES CO., LTD

UPSRB03

Preliminary

LINEAR INTEGRATED CIRCUIT

www.unisonic.com.tw

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Copyright © 2016 Unisonic Technologies Co., Ltd

QW-R129-020.a

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 UPSRB03 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 multi-mode operations to achieve

high performance and high efficiency. Device operations in PFM

in CC mode at large load condition and it operates in PWM with

frequency reduction at light/medium load which can cancel audio

noise.

The UTC UPSRB03 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 UPSRB03 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

* Multi-Mode control for cancel audio noise

* ±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

* Driver BJT switch

* Built-in Line CC compensation

* Built-in leading edge blanking

* Driver soft start

* Built-in primary winding inductance

compensation

* Open circuit protection

* Output over voltage protection

* Short circuit protection

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ORDERI N G I N FORM AT I ON

Ordering Number

Package

Packing

UPSRB03G-AF5-R

SOT25

Tape Reel

UPSRB03G-AF5-R

(1)Packing Type

(2)Package Type

(3)Green Package

(1) R: Tape Reel

(2) AF5: SOT-25

(3) G: Halogen Free and Lead Freee