Secondary-Side Synchronous Rectifier Controller for Flyback Converters

  HL9701 Main Photo   HL9701 Second alternate photo


The HL9701 is a secondary-side synchronous rectifier (SR) controller for isolated flyback converters. By implementing proprietary turn-off control algorithm, the HL9701 can reliably support discontinuous conduction mode (DCM), quasi-resonant (QR), and continuous conduction mode (CCM) operation, which helps to design robust flyback converters.


  • Compatibility of continuous conduction mode (CCM), quasi-resonant (QR), and discontinuous conduction mode (DCM)
  • Compatible with high side and low side application
  • Wide input voltage ranges up to 26.5V
  • Optimized SR gate turn-off threshold control
  • Proprietary CCM SR turn-off control algorithm
  • Minimized SR turn-on/off propagation delay
  • SR MOSFET gate passive clamp
  • Low power saving mode
  • Small footprint with SOT-23 6 pin package

For more information or a full datasheet request, please contact the factory at sales@elevationsemiconductor.com.