OB2500P Datasheet | On-Bright

DESCRIPTION OB2500P 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 Constant 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 pensation. Device operates in PFM in CC mode at large load condition and it operates in PWM with frequency reduction at light/medium load. The chip consumes very low operation current. It achieves less than 75m W standby power to meet strict standby power standard. OB2500P offers prehensive protection coverage with auto-recovery feature including Cycle-by-Cycle current limiting, VDD over voltage protection, feedback loop open protection, short circuit protection, built-in leading edge blanking, VDD under voltage lockout (UVLO), OTP etc. OB2500P is offered in SOP7 packages. Figure.1. Typical CC/CV Curve TYPICAL APPLICATION FEATURES - Primary-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 - Integrated 2A 650V MOSFET - Good dynamic response - Programmable CV and CC regulation - Built-in primary winding inductance pensation - Programmable cable drop pensation - No need for control loop pensation - Audio noise free operation - Built-in leading edge blanking (LEB) - Ultra low start-up current and low operating current - prehensive protection coverage with auto-recovery - On-chip OTP and external OTP - VDD over voltage protection - VDD under voltage lockout with hysteresis (UVLO) - Cycle-by-Cycle current...