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1.2V/100A Output DC-DC Converter Compliant with 48V Bus Voltage

This reference design provides specification, block diagram and PCB layout data of 1.2V/100A output isolated DC-DC converter which convert 48V bus voltage to 1.2V directly.

Block diagram of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.
Block diagram
Efficiency curves of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.
Efficiency curves


  • Input voltage : DC 40 to 59.5V
  • Output voltage : DC 1.2V
  • Output power : 120W
  • Circuit topology : Half Bridge + Synchronous Rectification


Features of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.
  • Total efficiency : 92.8%(Vin=54.5V, 30% load)
  • Outline size : 160mm x 100mm  x 30mm
  • 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 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
TPN1200APL MOSFET Primary side, 2 U-MOSIX-H/100V/11.5mΩ(max)@VGS=10V/TSON Advance
TPHR6503PL MOSFET Secondary side synchronous rectification, 4 U-MOSIX-H/30V/0.65mΩ(max)@VGS=10V/SOP Advance
TLP785 Photocoupler Output voltage feedback, 1 DC input/Trasistor output/BVS=5000Vrms(min)/DIP4
TLP2767 Photocoupler Communication between primary side and secondary side, 2 DC input/IC output/BVS=5000Vrms(min)/SO6L/For high-speed communication
TBAT54S Schottky Barrier Diode Primary side, 2 30V/0.2A/VF=0.58V(max)@IF=0.1A/SOT-23/2in1
BAS316 Switching Diode

Primary side, 3

Secondary side, 2

100V/0.25A/VF=1.25V(max)@IF=0.1A/High speed switching/USC


Name Date



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