Active Clamp Forward DC-DC Power Supply Basic Simulation Circuit

This reference design provides OrCAD® based simulation circuit, simulation results and design guide. This is for designing Active Clamp Forward topology of DC-DC power supply.

Circuit of active clamp forward DC-DC power supply basic simulation circuit.


  • Bundled simulation circuit and device models.
  • Able to edit power supply specificatoin and devices freely.
  • Able to set power supply specificatoin and ciruit parameters on OrCAD®


  • Basic simulation circuit of Active Clamp Forward DC-DC power supply that can operate on OrCAD®.
Input voltage DC 24 V
Output voltage DC 3.3 V
Output power 70 W
Waveforms of active clamp forward DC-DC power supply basic simulation circuit.

Design Documents

Design Documents contain the documents below.

Design Data

Design Data contains the contents listed below.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Power MOSFET (N-ch single 30V<VDSS≤60V) Primary side・1 N-ch MOSFET, 60 V, 0.0048 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (P-ch single) Primary side・1 P-ch MOSFET, -60 V, -5.0 A, 0.0395 Ω@10V, PS-8
Power MOSFET (N-ch single VDSS≤30V) Secondary side
synchronous rectification・2
N-ch MOSFET, 30 V, 0.002 Ω@10V, SOP Advance, U-MOSⅨ-H

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