APR34509 Datasheet | Diodes Incorporated

Description The APR34509 is a secondary side bo IC, which bines an NChannel MOSFET and a driver circuit designed for synchronous rectification (SR), supports CCM, DCM and Quasi-Resonant Flyback Topologies. The N-Channel MOSFET has been optimized for low gate charge, low RDS(ON), fast switching speed and body diode reverse recovery performance. The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. By sensing MOSFET drain-to-source voltage, the APR34509 can output ideal drive signal with less external ponents. It can provide high performance solution for 5V to 12V output voltage application. The APR34509 is available in SO-8EP package. Pin Assignments (Top View) DRISR 1 VCC 2 CCM 3 VDET 4 8 GND 7 GND 6 AREF 5 DRAIN Note: The DRAIN pin of internal MOSFET is exposed PAD, which is at the bottom of IC (the dashed box). The secondary current should flow from GND(pin 7,8) toth is exposed PAD. SO-8EP Features - Synchronous Rectification for DCM Operation Flyback - Eliminate Resonant Ring Interference - Fast Detector of Supply Voltages - Fewest External ponents - Totally Lead-Free & Fully Ro HS pliant (Notes 1 & 2) - Halogen and Antimony Free. “Green” Device (Note 3) Applications - Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3 and Other Portable Apparatus - Standby and Auxiliary Power Supplies Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (Ro HS) & 2011/65/EU (Ro HS 2) pliant. 2. See http://.diodes./quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony pounds. Typical Applications Circuit Primary Control D1 R1 ZD1 C23 R21 C21 C22 ++ Q1 CY R2 ZD2 R3 R23 DRAINDRAIN GND DRISR VDET...