UPSRB01A

DESCRIPTION

The UTC UPSRB01A 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 UPSRB01A 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 UPSRB01A 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,

V DD over voltage protection, feedback loop open protection, short

circuit protection, leading edge blanking, V DD under voltage

lockout, etc.

 FEATURES

* ±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

* Built-in leading edge blanking

* Built-in primary winding inductance

compensation

* Open circuit protection

* Output over voltage protection

* V DD over voltage protection

* Short circuit protection

* Over temperature protection

规格书UPSRB01A