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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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300W Isolated DC-DC Converter

This reference design provides specification, block diagram and PCB layout data of 300W isolated DC-DC converter which is small size and suitable for consumer applications.

Block diagram of 300W Isolated DC-DC converter.
Block Diagram
Efficiency curves of 300W Isolated DC-DC converter.
Efficiency Curves


  • Input voltage : DC 36 to 75V
  • Output voltage : DC 12V
  • Output power : 300W
  • Circuit topology : Phase Shift Full Bridge + Synchronous Rectification


Features of 300W Isolated DC-DC converter.
  • Total efficiency : 94.5%(Vin=48V, 100% load)
  • Outline size : 82mm x 82mm  x 24mm
  • Provides appropriate power MOSFETs and photocouplers totally.

Reference design files

Design, Document

“Design・Document” contains the documents listed below.

Name Date

Design, File

“Design・File” contains the documents 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
TPN1200APL MOSFET Primary side・4 U-MOSIX-H/100V/10mΩ(max)@VGS=10V/TSON Advance
TPH3R70APL MOSFET Secondary side synchronous rectification・4 U-MOSIX-H/100V/3.7mΩ(max)@VGS=10V/SOP Advance
TLP291(SE GR Photocoupler Output voltage feedback・1 DC input/Trasistor output/BVS=5000Vrms/11-3C1
TLP2370 Photocoupler Communication between primary side and secondary side・2 DC input/IC output/BVS=3750Vrms/SO6/For high-speed communication
CRS10I30B Schottky Barrier Diode Secondary side・1 30V/1A/VFM=0.42V(max)@IFM=1A/S-FLAT
CTS05F40 Schottky Barrier Diode Secondary side・7 40V/0.5A/VF=0.81V(max)@IF=500mA/SOD-882




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