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Secondary Side Synchronous Rectification Switcher

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APR3415C is a secondary side Combo IC, which combines an N-Channel MOSFET and a driver circuit designed for synchronous rectification (SR) in DCM operation. It also integrates output voltage detect function for primary side control system.

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, APR3415C can output ideal drive signal with less external components. It can provide high performance solution for 5V output voltage application.

Same as AP4341, APR3415C 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, APR3415C can effectively improve the transient performance of primary side control system.

The APR3415C is available in SO-8 package.


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


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

Product Specifications

Product Parameters

InternalTriggerVoltage (V) 5.15 V
VCC Max (V) 6
OperatingCurrent (µA) 100 µA
Turn-OffThresholdVoltage (mV) -12.5 mV
Min On-Time (ns) 1800
Turn-OffDelay (ns) 100 ns
DrainRating (V) 50 V
SwitchingFET 15

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