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The APR34509 is a secondary side Combo IC, which combines an N-Channel 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 components.

It can provide high performance solution for 5V to 12V output voltage application.

The APR34509 is available in SO-8EP package.


  • Adapters/Chargers for Cell/Cordless Phones, ADSL Modems, MP3 and Other Portable Apparatus
  • Standby and Auxiliary Power Supplies


  • Synchronous Rectification for DCM Operation Flyback
  • Eliminate Resonant Ring Interference
  • Fast Detector of Supply Voltages
  • Fewest External Components

Product Specifications

Product Parameters

Internal Trigger Voltage N/A V
Operating Current 100 µA
Turn-Off Threshold Voltage -11.5 mV
Min On-Time (ns) 1600
Turn-Off Delay 100 ns
Drain Rating 60 V
Switching FET 8

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
APR34509MPTR-G1 Mouser Electronics Inc. 3556 7/17/2019 Buy Now Americas
APR34509MPTR-G1 Digi-Key Electronics 3904 7/16/2019 Buy Now Americas