Diodes Incorporated

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Optimizing for supporting pure QR mode

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The APR347 is a secondary side MOSFET driver for synchronous rectification in DCM operation.

The synchronous rectification can effectively reduce the secondary side rectifier power dissipation and provide high performance solution. By sensing primary MOSFET gate-to-source voltage, the APR347 can output ideal drive signal with less external components. It can provide high performance solution for 3.3V to 15V output voltage application.

The APR347 is available in SOT26 package.


  • Synchronous Rectification for DCM Operation Flyback
  • Eliminate Resonant Ring Interference
  • Fewest External Components


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

Product Specifications

Product Parameters

Operation Mode QR/DCM
VCC Maximum Rating 28
OperatingCurrent (µA) 150 µA
Turn-OffThresholdVoltage (mV) -5 mV
Turn-OffDelay (ns) 100 ns
Release Date 201906

Related Content


Technical Documents

Evaluation Boards and User Guides

Recommended Soldering Techniques



Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site