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5 kW Isolated Bidirectional DC-DC Converter

This reference design provides design guide, data and other contents of 5kW Isolated Bidirectional DC-DC Converter using dual active bridge (DAB) conversion method with 1200V SiC MOSFETs.

Simple block diagram of 5 kW Isolated Bidirectional DC-DC Converter.
Simple Block Diagram
Efficiency curve of 5 kW Isolated Bidirectional DC-DC Converter.
Efficiency Curve


High Voltage Side DC 732V to 768V
Low Voltage Side DC 396V to 404V
Rated Power 5.0kW
Circuit Configuration Dual Active Bridge(DAB)Conversion Method


Image of 5 kW Isolated Bidirectional DC-DC Converter.
  • Efficiency:97% (Vin = 750 V, 100% load)
  • Outline size:565 mm x 360 mm x 270 mm
  • Total solution of SiC MOSFET, MOSFET, Smart Gate Driver and Isolation Amp.

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



High voltage side switch・4

1200 V/70 mΩ (typ.) @VGS = 20 V/TO-3P(N)



Low voltage side switch・4

650 V/51 mΩ (typ.) @VGS = 10 V/TO-247

TLP5214A Smart gate driver Gate drive・8 Photocoupler  (photo-IC output) /Creepage and clearance 8 mm/High temperature 110 ℃ operation/SO16L


Isolation amplifier

Voltage detection・2

Photocoupler (isolation amplifier) /Analog output/DIP8



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