A Product Line of Diodes Incorporated APR3415 SECONDARY SIDE SYNCHRONOUS RECTIFICATION SWITCHER Description Pin Assignments APR3415 is a secondary side Combo IC, which combines an N- Channel MOSFET and a driver circuit designed for synchronous (Top View) rectification (SR) in DCM operation. It also integrates output voltage detect function for primary side control system. 1 DRISR 8 DRAIN The N-Channel MOSFET has been optimized for low gate charge, low R , fast switching speed and body diode reverse recovery DS(ON) VDET 7 DRAIN 2 performance. AREF 3 6 GND The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. 5 GND VCC 4 By sensing MOSFET drain-to-source voltage, APR3415 can output ideal drive signal with less external components. It can provide high performance solution for 5V output voltage application. SO-8 Same as AP4341, APR3415 detects the output voltage and provides a periodical signal when the output voltage is lower than a certain threshold. By fast response to secondary side voltage, APR3415 can effectively improve the transient performance of primary side control Applications system. The APR3415 is available in SO-8 package. Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3 and Other Portable Apparatus Standby and Auxiliary Power Supplies Features Synchronous Rectification for DCM Operation Flyback Eliminate Resonant Ring Interference Fast Detector of Supply Voltages Fewest External Components Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See VDET A Product Line of Diodes Incorporated APR3415 Pin Descriptions Pin Number Pin Name Function 1 DRISR Synchronous rectification MOSFET drive Synchronous rectification sense input and dynamic function output, connected to DRAIN 2 VDET through a resistor Program a voltage reference with a resistor from AREF to GND, to enable synchronous 3 AREF rectification MOSFET drive signal 4 VCC Power supply, connected with system output 5, 6 GND Source pin of internal MOSFET, connected to Ground 7, 8 DRAIN Drain pin of internal MOSFET Functional Block Diagram VCC 4 V REF I OVP Integrator Dynamic OVP (V -V )*t DET CC ONP I AREF Counter t ONPDET 3 AREF OSC 1 DRISR SRDRIVER 5, 6 GND 7, 8 DRAIN 2 VDET 2 of 13 APR3415 June 2015 Diodes Incorporated www.diodes.com Document number: DS36738 Rev. 7 - 2 NEW PRODUCT