Custom Power Supplies
Custom Industrial Power Supplies

300 Watt Military Grade ATX Power Supply

300 Watt Military Grade Power ATX Supply Product Description

This preliminary product specification outlines the electrical and mechanical characteristics for the proposed 300 watt, convection cooled, five output, military grade, ATX power supply. This power supply will operate from an ambient temperature range of -25° to +70°C. Unit will be designed to be military compliant to meet MIL-STD-461F & MIL-STD-810F. This supply will also meet UL/cUL 60950 and EN 60950 requirements.  

Product Features

  • Meets MIL-STD-461F
  • Meets MIL-STD-810F
  • Wide Range Input: 90-265Vac
  • Wide Range Frequency: 47-415Hz
  • Operating Temperature Range: -20º to +70º C
AC Input
  • Voltage Input Range: 90-264VAC (115/230Vac nominal input)
  • Frequency: 50/60/400Hz (47-440Hz)
  • Phase: Single Phase, 2 wire plus ground
  • Power factor correction: 0.99 @ Full Load
  • Input Transient Suppression: Designed to meet MIL-STD-704F (80Vrms for 20mS, 180Vrms for 100mS and 480Hz peak) 

Output Selection Guide



Max Current





25 Amps


50mV pk-pk



30 Amps


50mV pk-pk



20 Amps


120mV pk-pk



2.0 Amps


120mV pk-pk



1.0 Amps


50mV pk-pk



3.0 Amps


50mV pk-pk


  1. The combined power of +5V and +3.3V is 150W max.
  2. +12V output provides 25A peak for 15 seconds.

DC Output Characteristics

  • Output Power: 300 Watts
  • Line Regulation: ±5.0% Typical
  • Load Regulation: ±1.0% Typical (No load to full load; nominal input)
  • Output Ripple/Noise: 1% Typical (pk-pk; nominal input; full load; 20MHz bandwidth)
  • Set Point Accuracy: ± 1.0% of Output Voltage (Nominal input; full load; 25°C)
  • Transient Response: Output voltage returns to within 1% in less than 2.5mS for a 50% load change and the peak transient does not excess 5%.
  • Overshoot: Turn-on and turn-off overshoot should not exceed 5% over nominal voltage.

Electrical Characteristics

  • Efficiency: 80% Typical (Measuring at 115Vac and at full load)
  • Hold-up Time: 16mSec at full load, nominal 115Vac input
  • Set Point Accuracy: All outputs shall be initially set to ± 2.0% of nominal output voltage.
  • Isolation Resistance: >1 Megohms (Input to output)
  • Transient Response: Output voltage returns to regulation limits within 100 microsecond for auxiliary outputs after 50% change in load current.
  • Overshoot: Turn-on and turn-off overshoot should not exceed 5% over nominal voltage.


  • Over Current Protection: Output is protected for overload conditions exceeding 110-125%.  Recovery is automatically after removal of overload condition.
  • Over-Voltage Protection: Output is protected against over-voltage. Unit latching down will occur when output exceed 130%, and recycle AC input to reset.
  • Short Circuit Protection: The power supply is protected from short circuit conditions and will recover automatically after short circuit condition is removed.
  • Operating Temperature Range: -25º to +70º C  
  • Storage Temperature: -40º to 85º C
  • Operating Humidity: 5% to 90% RH, Non-condensing
  • Storage Humidity: 5% to 95% RH, Non-condensing
  • Operating Altitude: Sea-level to 40,000 ft. in pressurized environment
  • Sock & Vibration Standards: Designed to comply with MIL-STD-810F
  • Conducted EMI: Designed to comply with MIL-STD-461F  
  • Cooling: Convection cooled


  • 150,000 hours, calculated per MIL-STD-217F at +25°C baseplate, ground fixed.


  • Outline Dimensions: ~1.65" X 4.0" X 8.0" (H X W X L) – not including I/O connector  
  • Weight: ~4.25 lbs. (1922 grams)
  • AC Input & Output Connector: Terminal Block

Additional Features, Controls or Alarms

  • Remote On/Off: TTL High– OFF; TTL Low - ON TTL Logic Enable
  • Power Good Delay: 100-500 mSec
  • Power Fail Delay: >1mSec


  • This preliminary product specification represents a proposed design and specifications are subject to change without notice.

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