SF1531

SF1531 η-BalanceTM Current Mode PWM Controller FEATURES ◆ Proprietary η-BalanceTM Control to Boost Light Load Efficiency ◆ Proprietary “Zero OCP/OPP Recovery Gap” Control ◆ Built-in Soft Start Function ◆ Very Low Startup Current ◆ High Voltage CMOS Process with Excellent ESD Protection ◆ Frequency Reduction and Burst Mode Control for Energy Saving ◆ Current Mode Control ◆ Built-in Frequency Shuffling ◆ Programmable Switching Frequency ◆ Built-in Synchronous Slope Compensation ◆ Pins Floating Protection ◆ Cycle-by-Cycle Current Limiting ◆ Built-in Leading Edge Blanking (LEB) ◆ Constant Power Limiting ◆ Audio Noise Free Operation ◆ VDD OVP & Clamp ◆ VDD Under Voltage Lockout (UVLO) APPLICATIONS Offline AC/DC Flyback Converter for ◆ AC/DC Adaptors ◆ Open-frame SMPS ◆ Set-Top Box Power Supplies ◆ ATX Standby Power GENERAL DESCRIPTION SF1531 is a high performance, high efficiency, low cost, highly integrated current mode PWM controller for ...