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200 W Active Clamp Forward DC-DC Converter

This reference design provides design guide, data and other contents of 1 kW server power supply using phase shifetd full-bridge DC-DC converter.

Simple block diagram of 200 W active clamp forward DC-DC converter.
Simple Block Diagram
Efficiency curves of 200 W active clamp forward DC-DC converter.
Efficiency Curves


Input voltage DC 38.5 to 60 V
Output voltage DC 24 V 
Output power 10 to 200 W
Circuit topology Active Clamp Forward + Synchronous Rectification


Exterior photo of 200 W active clamp forward DC-DC converter.
  • Total efficiency : 90.8 % (Vin = 48 V, 100 % load)
  • Outline size : 130 mm x 115 mm x 30 mm (excluding input and output terminals on backside)
  • Uses optimum power MOSFETs and photocoupler

Reference design files

Design, Document

“Design・Document” contains the documents listed below.


Design, File

“Design・File” contains the contents listed below.

*1:Actual PCB was designed on CR5000BD. The other files were made from CR5000BD file.
*2:The data was generated on CR5000BD.

Toshiba items

Part Number Device Category Portion Usage Description
TPH3300CNH MOSFET Primary-side main switch・1 150 V/33 mΩ (max) @VGS = 10 V/SOP Advance
TPN5900CNH MOSFET Primary-side clamp switch・1 150 V/59 mΩ (max) @VGS = 10 V/TSON Advance
TPH9R00CQH MOSFET Secondary-side・4 150 V/9.0 mΩ (max) @VGS = 10 V/SOP Advance
TLP785(GR Photocoupler Output voltage feedback・1 DC input/Transistor output/BVS = 5000 Vrms (min)/DIP4(TLP785)



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