• Home
  • Products
  • > Power Management
  • > AC/DC Power Management


Synchronous Rectifier Controller


The EUP9290 is a high performance controller used to secondary side synchronous rectifier (SR).

The fundamental of EUP9290 is utilized N-channel MOSFET power devices used for secondary side synchronous to emulate a near-ideal diode rectifier. This method not only directly reduces power dissipation of the rectifier but also reduces primary side losses as well.

The EUP9290 is applied voltage-second balancing control method and not directly connected to the MOSFET drain, so it is ideal for flyback power supplies over the wide-output voltage range. The SR drive turn-off threshold is not related to the MOSFET RDS(on), which allows optimizing for maximum conduction time.

The EUP9290 offers a frequency detector to automatically switch to standby mode during low power conditions and pin fault protections. It is compatible with DCM, TM and CCM operation


  • •Secondary-Side SR Optimized Controller for 5V to 24V Flyback Systems
  • •Volt-Second Balance SR On-Time Control
  • •Compatible with Primary-Side and Second-Side Control
  • •CCM Operation Compatibility
  • •Short Pin Fault Protection
  • •Available in SOP-8 and SOT23-6 Packages
  • •RoHS Compliant and 100% Lead (Pb)-Free
  • Halogen-Free


  • •Switching Mode Power Supply(DCM, TM and
  • CCM)
  • •Chargers for Smart Phones and Tablets
  • •High Efficiency Auxiliary Power in Server
  • Desktop and Appliance Application
Copyright  ©  2014  Eutech Microelectronics Inc. All Rights Reserved.
Designed by: iware 網頁設計