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.

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

Features

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

Description

  • Input voltage : DC 40 to 59.5V
  • Output voltage : DC 1.2V
  • Output power : 120W
  • Circuit topology : Half Bridge + Synchronous Rectification
Efficiency curves of 1.2V/100A output DC-DC converter compliant with 48V bus voltage.
Efficiency curves

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 60V<VDSS≤150V) Primary side, 2 N-ch MOSFET, 100 V, 0.0115 Ω@10V, TSON Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Secondary side synchronous rectification, 4 N-ch MOSFET, 30 V, 0.00065 Ω@10V, SOP Advance, U-MOSⅨ-H
Photocoupler (phototransistor output) Output voltage feedback, 1 Photocoupler (phototransistor output), DC input, 5000 Vrms, DIP4(TLP785)
Photocoupler (photo-IC output) Communication between primary side and secondary side, 2 Photocoupler (photo-IC output), High-speed, 50 Mbps, 5000 Vrms, SO6L
Small-signal Schottky barrier diode Primary side, 2 30 V/0.2 A Schottky Barrier Diode, SOT-23(SOT23)
Switching diode Primary side, 3
Secondary side, 2		 100 V/0.25 A Switching diode, SOD-323(USC)

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