AP3768 Datasheet | BCD Semiconductor

Preliminary Datasheet LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER General Description Features 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 pensation circuitry while maintaining stability. The AP3768 achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 30m W. The AP3768 has the built-in programmable cable voltage drop pensation function, which make it flexible to acmodate various cables with different gauges and lengths. - Primary Side Control for Eliminating Opto-coupler and Secondary CV/CC Control Circuitry - 30m W No-load Input Power - Programmable Output Cable Voltage Drop - pensation - Proprietary CC Tightening Technique to Achieve Vertical CC Profile - pensation for External ponent 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 Other Portable Apparatus - LED Driver - Standby and Auxiliary Power Supplies Aug. 2010 Rev. 1. 0 SOIC-8 Figure 1. Package Type of AP3768 BCD Semiconductor Manufacturing Limited 1 Preliminary...