AP3766 Datasheet | BCD Semiconductor

Preliminary Datasheet LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP3766 General Description The AP3766 is a high performance AC/DC power supply controller for LED drivers, battery charger and adapter applications. The device uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) flyback power supplies. The AP3766 provides accurate constant voltage, constant current (CV/CC) regulation while removing the opto-coupler and secondary control circuitry. It also eliminates the need of loop pensation circuitry while maintaining stability. The AP3766 achieves excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less than 30m W. The AP3766 is available in SOT-23-6 package. Features - - - - - - - - - - - - Primary Side Control for Rectangular Constant Current and Constant Voltage Output Sub-microampere Start-up Current 30m W No-load Input Power Feasible Tight CC Regulation Performance Eliminates Opto-coupler and Secondary CV/CC Control Circuitry Eliminates Control Loop pensation Circuitry Flyback Topology in DCM Operation Random Frequency Modulation to Reduce System EMI Built-in Soft Start Open Feedback Protection Short Circuit Protection SOT-23-6 Package Applications - - - LED Drivers Adapters/Chargers for Cell/Cordless Phones, PDAs, MP3 and Other Portable Apparatus Standby and Auxiliary Power Supplies SOT-23-6 Figure 1. Package Type of AP3766 Aug. 2010 Rev. 1. 2 1 BCD Semiconductor Manufacturing Limited Preliminary Datasheet LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP3766 Pin Configuration K6 Package (SOT-23-6) Pin 1 Dot by Marking OUT GND VCC 1 2 3 6 5 4 FB GND CS Figure 2. Pin Configuration of AP3766 (Top View) Pin Description Pin Number 1 2, 5 3 4 6 Pin Name OUT GND VCC CS FB Function This pin drives the base of external power NPN switch Ground Supply voltage The primary current sense The voltage feedback from the auxiliary...