500 W Server Power Supply

This reference design provides design guide, data and other contents of 500 W server power supply using continuous current mode PFC and LLC DC-DC converter.

Photo of 500 W server power supply.
Simple block diagram of 500 W server power supply.


  • 1 U rack size and high efficiency power supply
  • Total efficiency:93 % (Vin = 230 V at 100 % load)
  • Outline size:240 mm x 135 mm x 40 mm
  • Provides appropriate power devices(MOSFET and SiC diode) and photocouplers totally


Input voltage AC 90 to 264 V
Output voltage DC 12 V
Output power 500 W
Circuit topology Continuous Current Mode PFC, LLC (Half-Bridge) + Synchronous Rectification, Oring Circuit for Output
Efficiency curves of 500 W server power supply.
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 500V<VDSS≤700V) PFC・1 N-ch MOSFET, 650 V, 0.09 Ω@10V, TO-220SIS, DTMOSⅥ
SiC Schottky barrier diode PFC・1 650 V/6 A SiC Schottky Barrier Diode, TO-220-2L
Power MOSFET (N-ch 500V<VDSS≤700V) Primary side・2 N-ch MOSFET, 600 V, 0.175 Ω@10V, TO-220SIS, DTMOSⅣ
Power MOSFET (N-ch single 30V<VDSS≤60V) Secondary side・4 N-ch MOSFET, 60 V, 0.00128 Ω@10V, SOP Advance, U-MOSⅨ-H
Power MOSFET (N-ch single VDSS≤30V) Oring・3 N-ch MOSFET, 30 V, 0.00092 Ω@10V, SOP Advance, U-MOSⅨ-H
Photocoupler (phototransistor output) Output voltage feedback・1 Photocoupler (phototransistor output), DC input, 5000 Vrms, DIP4(TLP785F)

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