OB2573Y Datasheet | On-Bright

High Precision CC/CV Primary-Side Power Switch GENERAL DESCRIPTION Features OB2573Y 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. The device integrates an internal - High precision constant voltage and current power MOSFET and operates in primary-side regulation at universal AC input sensing and regulation. Consequently, - PFM operation for efficiency improving opto-coupler and TL431 could be eliminated. - Integrated Power MOSFET Proprietary Constant Voltage (CV) and Constant - Good dynamic response Current (CC) control is integrated as shown in the - Programmable CV and CC regulation figure below. - Built-in primary winding inductance In CC control, the current and output power setting pensation can be adjusted externally by the sense resistor - No need for control loop pensation Rs at CS pin. In CV control, multi-mode operations - Audio noise free operation are utilized to achieve high performance and high - Built-in leading edge blanking (LEB) 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 to condition and it operates in PWM with frequency reduction at light/medium load. The chip l consumes very low operation current. It achieves less than 75m W standby power to meet strict tia standby power standard. OB2573Y offers prehensive protection coverage with auto-recovery feature including n Cycle-by-Cycle current limiting, VDD over voltage e protection, feedback loop open protection, built-in leading edge blanking, VDD under voltage lockout fid (UVLO), OTP etc. OB2573Y is offered in SOP8 packages. Vo on ±5% - Ultra low start-up current and low operating current - prehensive protection coverage with auto-recovery - VDD over voltage protection - VDD under voltage lockout with hysteresis (UVLO) - Cycle-by-Cycle...