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

Block diagram

Block diagram Click to enlarge
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Efficiency curves

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


  • Total efficiency : 92.8%(Vin=54.5V, 30% load)
  • Outline size : 160mm x 100mm  x 30mm
  • Provides appropriate power MOSFETs and photocouplers totally.
Click the image to see the picture image

Picture image

Reference design files

Design, Document


“Design・Document” contains the documents listed below.

Circuit diagram


PCB layers

Reference guide

Design guide

Design, File


“Design・File” contains the contents listed below.

・Circuit Schematic(OrCAD® / EDIF / CR5000SD / Altium Designer

・PCB layout data *1 (CR5000BD rev.13 / rev.16/ rev.19/ CR800DF/ Allegro PCB / LPB G-Format)

・PCB fabrication data *2 (Gerber Format®ODB++)

*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
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


Application Note


Name Date



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