AP1680K6TR-G1 Diodes Incorporated

Preliminary Datasheet LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP1680 General Description Features The AP1680 is a high performance AC/DC power sup- Primary Side Control for Rectangular Constant ply controller for LED drivers, battery charger and Current and Constant Voltage Output adapter applications. The device uses Pulse Frequency Sub-microampere Start-up Current Modulation (PFM) method to build discontinuous con- 30mW No-load Input Power Feasible duction mode (DCM) flyback power supplies. Tight CC Regulation Performance Eliminates Opto-coupler and Secondary CV/CC The AP1680 provides accurate constant voltage, con- Control Circuitry stant current (CV/CC) regulation while removing the Eliminates Control Loop Compensation Circuitry opto-coupler and secondary control circuitry. It also Flyback Topology in DCM Operation eliminates the need of loop compensation circuitry Random Frequency Modulation to Reduce while maintaining stability. The AP1680 achieves System EMI excellent regulation and high average efficiency, yet meets the requirement for no-load consumption less Built-in Soft Start than 30mW. Open Feedback Protection Short Circuit Protection The AP1680 is available in SOT-23-6 package. 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 AP1680 Apr. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER AP1680 Pin Configuration K6 Package (SOT-23-6) Pin 1 Dot by Marking OUT 6 FB 1 GND GND 5 2 VCC CS 34 Figure 2. Pin Configuration of AP1680 (Top View) Pin Description Pin Number Pin Name Function 1 OUT This pin drives the base of external power NPN switch 2, 5 GND Ground 3 VCC Supply voltage 4 CS The primary current sense 6 FB The voltage feedback from the auxiliary winding Apr. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2