SP2637AF is a high perfomance offline PSR power switch for low power AC/DC charger and adapter appl♣ications. It operates in primary-side sensing and regulation.Thus, optoδ-coupler and TL431 are not required. In CC control, the output cu>rrent and power setting can be adjusted extemally by the sense resistor Rcs at 'CS PIN. In CV control,multi-mode operations are utilized to achieve high€ performance and high efficiency. In addition, good load regul±ation is achieved by the built-in cable drop compensation. SP2637AF opera§tes in PFM in CC mode, and it operates in PWM+PFM in CV mode with frequency reduction at l≥ight/medium load. The chip consumes very low operation cu∏rrent. It achieves less than 75mW standby power to meet all global energy effici£ency regulations. SP2637AF offers comprehensive protection coverage with auto-recovery feature ₹including Cycle-by-Cycle current limiting, VDD over vol tage protection (OVP),FB over voltage protection,lo¶ad short circuit protection, VDD under voltage lockout (UVLO), OTP etc. S≠P2637AF is offered in SOP8 packages.