100 W LLC DC-DC Converter

This reference design provides design guide, data and other contents of 100 W LLC DC-DC Converter which uses Zero Volt Switching implemented using LLC resonance.

Simple Block Diagram of 100 W LLC DC-DC Converter
Simple Block Diagram
Efficiency Curve of 100 W LLC DC-DC Converter
Efficiency Curve


Input voltage DC 22.8 to 25.2 V
Output voltage DC 12 V 
Output power 100 W
Circuit topology LLC Resonance + Synchronous Rectification Circuit


Board photo of 100 W LLC DC-DC Converter
  • Total efficiency : 88 % (Vin = 24 V, 100 % load)
  • Outline size : 110 mm x 110 mm x 35 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
TPN7R504PL MOSFET Primary-side main switch・2 40 V/7.5 mΩ (max) @VGS = 10 V/TSON Advance
TPH1R204PL MOSFET Secondary-side・2 40 V/1.24 mΩ (max) @VGS = 10 V/SOP Advance
TLP785-GR Photo Coupler Output voltage feedback・2 DC input/Transistor output/BVS = 5000 Vrms (min)/DIP4(TLP785)



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