SF5922

SF5922 High Precision Primary Side Regulation (PSR) CV/CC Power Switch FEATURES ◆ Built-in 600V Power MOSFET ◆ Low Standby Power Under 30mW, Easily to Pass Energy Star EPS2.0 ◆ Primary Side Regulation (PSR) without TL431 and Opto-Coupler ◆ ± 5% Constant Current (CC) and Constant Voltage (CV) Regulation at Universal AC Input ◆ Proprietary Cable Voltage Drop Compensation in CV Mode ◆ Compensate for Line Voltage Variation ◆ Compensate for Transformer Inductance Tolerances ◆ Built-in Control Loop Compensation in CV Mode ◆ All Pins Floating Protection ◆ PFM Control Eases EMI Design ◆ Cycle-by-Cycle Current Limiting ◆ Built-in Leading Edge Blanking (LEB) ◆ Built-in Soft Start ◆ Output Over Voltage Protection ◆ VDD OVP & Clamp ◆ VDD Under Voltage Lockout (UVLO) GENERAL DESCRIPTION SF5922 is a high performance, highly integrated DCM (Discontinuous Conduction Mode) Primary Side Regulation (PSR) power switch for offline small power converter applications. SF5922 uses Pulse Frequency Modulation (PFM) control to improve efficiency and eases system EMI design. The IC dramatically lowers system cost by eliminating the opto-coupler and secondary control circuits. It also can provide very tight output voltage regulation (CV), in addition to output current control (CC) ideal for charging applications. SF5922 has Error Amplifier (EA) CV with built-in loop compensation network for CV control, which eliminates external compensation circuitry. It has built-in cable drop compensation function, wh...