OB2520

On Bright Confidential to Salcomp OB2520 High Precision CC/CV Primary-Side Controller GENERAL DESCRIPTION OB2520 is a high performance offline PSR controller 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, PFM operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is achieved by the built-in cable drop compensation. The chip consumes very low operation current (typical 300uA), it can achieve less than 30mW standby power to meet strict standby power standard. OB2520 offers comprehensive protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, VDD ov...