SP2637AF is a high perfomance offline PSR power switch for low ♣power AC/DC charger and adapter applications. It operates in primary-side sensing and regulation☆.Thus, opto-coupler and TL431 are not required. In ∏CC control, the output current and power setting can be adjusted extemal ly by the sense resistor Rcs at CS PIN. In CV control,multi★-mode operations are utilized to achieve high performance and high e≤fficiency. In addition, good load regulation is achieved by the built-in cable drop com↔pensation. SP2637AF operates in PFM in CC mode, and it opera©tes in PWM+PFM in CV mode with frequency reduction at ligh§t/medium load. The chip consumes very low operation current. ÷It achieves less than 75mW standby power to meet all gl÷obal energy efficiency regulations. SP2637AF offers comprehensive protection coverage  with auto-recovery feature including Cycle-by-Cycle cu₩rrent limiting, VDD over voltage protection (OVP),FB over voltage protection,load short circuit• protection, VDD under voltage lockout (UVLO), OTP etc. S§P2637AF is offered in SOP8 packages.