OB25133QCPA ON-bright High Precision CC/CV Primary-Side PWM Power Switch

OB25133QCPA 

OB2513xQ  SOP-8

High Precision CC/CV Primary-Side PWM Power Switch

General Description

 OB2513xQ is a high performance offline PSR power switch for low power AC/DC charger and adapter applications. It OPERATES IN primary-side sensing and regulation. Consequently, opto-coupler and TL431 could be eliminated. Proprietary Contant Voltage (CV) and Constant Current(CC) control is integrated as shown in the figure below. 

  In CC control , the current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. In CV  control, multi-mode operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the  built-in cable drop compensation. Device operates in PFM in CC mode as well at large load condition and it operates in PWM with frequency reduction a tlight/medium load. The chip consumes very low operation current, it can achieve less than 75mW standby power. 

OB2513xQ offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD over voltage protection ,short circuit protection, built-in leading edge blanking, VDD under voltage lockout(uvlo). Otp tec.

 Ob2513xQ is offered in SOP8 package.

Features

Primiary-side sensing and regulation without TL431 and opto- coupler

High precision constant voltage and current regulation at universal AC input 

 Multi-mode PWM/PFM operation for efficiency improving

Quasi-resonant operation for highest overall efficiency

 Good dynamic response

 Programmable CV and CC regulation 

Built-in line voltage and primary winding inductance compensation

Programmable calbe drop compensation

Audio noise free operation

 Internal BJT switch

Built-in Leading edge blanking (LEB)

Comprehensive Protection coverage with auto-recovery

  Vdd  over voltage protection

  VDD under voltage lockout with hysteresis( UVLO) 

  Cycle-by-cycle current limiting

  Feedback loop open protection

  Output short circuit protection

  Over temperature protection(OTP)

Applications

 Low power ac/dc offline SMPS for 

  Cell Phone Charger

  Digital Cameras Charger

  Small Power Adapter 

  Auxiliary Power for PC, TV etc.\

  Linear Regulator/RCC Replacement.