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.

Board photo of 100 W LLC DC-DC Converter

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  • 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


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
Efficiency Curve of 100 W LLC DC-DC Converter
Efficiency Curve

Design Documents

Design Documents contain the documents below.

Design Data

Design Data 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.

Used Toshiba Items

Part Number Device Category Portion Usage Description
Power MOSFET (N-ch single 30V<VDSS≤60V) Primary-side main switch・2 N-ch MOSFET, 40 V, 0.0075 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (N-ch single 30V<VDSS≤60V) Secondary-side・2 N-ch MOSFET, 40 V, 0.00124 Ω@10V, SOP Advance, U-MOSⅨ-H

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