SP2637AF is a high perfomance offline PSR power switch for low power AC/DC char¶ger and adapter applications. It operates in primary-side sensing and regula¶tion.Thus, opto-coupler and TL431 are not required. In CC control, the output" current and power setting can be adjusted extemally by the sense resistor "Rcs at CS PIN. In CV control,multi-mode operations are util©ized to achieve high performance and high efficiency. In addition, go™od load regulation is achieved by the built-in cable drop compensation. SP2637AF  operates in PFM in CC mode, and it operates in PWM+P♥FM in CV mode with frequency reduction at light/medium load. The chip consumes very low ♣operation current. It achieves less than 75mW standby power to meet all global energy efficiency re>gulations. SP2637AF offers comprehensive protection coverage with auto₹-recovery feature including Cycle-by-Cycle current limiting, VDD over voltage protection (O<VP),FB over voltage protection,load short circuit protection, VD‍D under voltage lockout (UVLO), OTP etc. SP2637AF is offered in SOP8 packages.