AP3768

Preliminary Datasheet LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER General Description Features AP3768 The AP3768 is a high performance AC/DC power supply controller for battery charger and adapter applications. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The AP3768 provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and secondary control circuitry. It also eliminates the need of loop compensation circuitry while maintaining stability. The AP3768 achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 30mW. The AP3768 has the built-in programmable cable voltage drop compensation function, which make it flexible to accommodate various cables with different gauges and lengths. · Primary Side Control for Eliminating Opto-coupler and Secondary CV/CC Control Circuitry · 30mW No-load Input Power · Programmable Output Cable Voltage Drop Com- pensation · Proprietary CC Tightening Technique to Achieve Vertical CC Profile · Compensation for External Component Tempera- ture Variations · Flyback Topology in DCM Operation · Random Frequency Adjustment to Reduce Sys- tem EMI · Built-in Soft Start · Over Voltage Protection · Short Circuit Protection · SOIC-8 Package Applications The AP3768 is available in SOIC-8 package. · Adapter/Chargers for Cell/Cordless Phones, PDAs, MP3 and ...