OB25133 Datasheet | On-Bright

OB2513x High Precision CC/CV Primary-Side PWM Power Switch GENERAL DESCRIPTION Features OB2513x is a high performance offline PSR power - Primary-side sensing and regulation without switch for low power AC/DC charger and adapter TL431 and opto-coupler applications. It operates in primary-side sensing - High precision constant voltage and current and regulation. Consequently, opto-coupler and TL431 could be eliminated. Proprietary Constant regulation at universal AC input - Multi-mode PWM/PFM operation for efficiency Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. improving - Good dynamic response 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 - Programmable CV and CC regulation - Built-in line voltage and primary winding inductance pensation - Programmable cable drop pensation efficiency. In addition, good load regulation is - No need for control loop pensation achieved by the built-in cable drop pensation. - Audio noise free operation Device operates in PFM in CC mode as well at - Internal BJT switch large load condition and it operates in PWM with - Built-in leading edge blanking (LEB) frequency reduction at light/medium load. The chip - prehensive protection coverage with consumes very low operation current, it can auto-recovery achieve less than 75m W standby power. - VDD over voltage protection OB2513x offers prehensive protection - VDD under voltage lockout with coverage with auto-recovery Features including to Cycle-by-Cycle current limiting, VDD over voltage l protection, short circuit protection, built-in leading tia edge blanking, VDD under voltage lockout (UVLO), OTP etc. n OB2513x is offered in SOP7 package. -Bright confide Figure.1. Typical CC/CV Curve hysteresis (UVLO) - Cycle-by-cycle current limiting - Feedback...