OB2576TCPA Datasheet | On-Bright

OB2576x T High Performance QR mode Primary-Side Power Switch GENERAL DESCRIPTION OB2576x T is an excellent primary side regulation power switch with CC/CV operation for medium level power AC/DC charger and adapter applications. The device integrates an internal power MOSFET and operates in QR mode to provide high efficiency along with several functions of built-in protections. It removes the need for secondary feedback circuitry to lower the total bill of material cost. Proprietary Constant Voltage (CV) and Constant Current (CC) control is integrated as shown in the figure below. In CV control, the controller changes the mode of operation according to load condition. At full loading, the controller operates in quasi-resonant (QR) mode in the universal line voltage. The primary side regulation power supplies up to high power without the efficiency limitation of DCM or audible noise. In CC control, OB2576x T samples the Vcs peak current and the demagnetization pulse to regulation the output current. The current and output power setting can be adjusted externally by the sense resistor Rs at CS pin. OB2576x T offers prehensive protection coverage with auto-recovery feature including Cycle-by-Cycle current limiting, VDD OVP, OLP, SCP, OTP etc. OB2576x T consumes less than 75m W input power at no- load condition with high line voltage. OB2576x T is offered in SOP8 package. Features - Primary-side sensing and regulation operates in QR mode without TL431 and opto-coupler - High precision constant voltage and current regulation at universal AC input - Programmable CV and CC regulation - Integrated power MOSFET - Good dynamic response - Built-in line pensation for tight CC regulation - Built-in fixed cable pensation - Built-in primary winding inductance pensation - Built-in control loop pensation - Built-in leading edge blanking (LEB) - Ultra low start-up current and low operating current - prehensive protection coverage with auto-recovery - VDD over voltage...