31 August 2023

CISSOID at The Battery Show North America in Novi, Michigan, on 12-14 Sept 2023.

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Download datasheet


Triple output Flyback 3.5W DC-DC Converter



The EVK-FUJI is a reference design for a non-isolated DCM Flyback DC-DC converter, with triple outputs. It is therefore a Point-of-Load solution suitable to generate 3 standard voltages from a single power supply input ranging from +12V to +28V. The default output voltage values are +5V; +3.3V and +1.8V; they can be modified to accommodate for different voltage needs. 

Typical performances

  • ICs Operating junction temperature: -55°C to +225°C
  • Evaluation Board suitable for testing up to 200°C (excursions)
  • Vin range: +12V to +28V
  • Triple voltage output (customizable):
    • +5V / 400mA
    • +3.3V / 250mA
    • +1.8V / 250mA
  • Power range: 3.5W
  • Based on:
    • 1x PWM Controller CHT-MAGMA
    • 4x transistors CHT-NMOS8001
  • Up to 68% efficiency
  • Switching frequency: 100kHz (default); adjustable up to 500kHz


  • Embedded power supply blocks in down-hole tools
  • PoL in aeronautics and aerospace
  • High reliability DC-DC modules

If you need support for your high temperature power supply design, just contact Cissoid.


Architecture of EVK-FUJI VOL1088A

Ordering information

2 versions of FUJI reference design are available:

  • EVK-VOL1088A: This version of the evaluation board implements the flyback voltage mode regulation loop on the main, +5V voltage output. The 2 secondary voltage outputs (+3.3V and +1.8V) are not regulated;  this version should be used when the load variation on the different outputs is not greater than ±50% of the nominal value;
  • EVK-VOL1088B: in this version, regulators do generate the 2 secondary, lowest voltage, outputs (+3.3V and +1.8V Typ.); this version should be used if load variation on the different outputs are subject to vary significantly, beyond ±50% of the nominal load value, or possibly reaching zero load situations.

A product brief for FUJI is available for download (see above).
The application note is available on request: Request FUJI application note.