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UC1108 Datasheet
 LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER

 

 

 

DESCRIPTION

 

The UTC UC1108 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 UC1108 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

UC1108 achieves excellent regulation and high average efficiency, yet

meets the requirement for no-load consumption less than 30mW.      

The UTC  UC1108 has the built-in programmable cable voltage

drop compensation function, which make it flexible to accommodate

various cables with different gauges and lengths

The UTC UC1108 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 protection, short

circuit protection, leading edge blanking, VCC under voltage lockout,

etc.  

 

FEATURES

 

* 30mW No-load Input Power

* Primary side control for eliminating opto-coupler and secondary CV/CC control circuitry

* Proprietary CC tightening technique to achieve vertical CC profile

* Programmable output cable voltage drop compensation        

* Compensation for external component temperature variations

* Random frequency adjustment to reduce system EMI    

* Flyback topology in DCM operation

* Built-in soft start

* Over voltage protection

* Short circuit protection

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