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PC/104-Plus Power Supply Module

  Features 50 watt continuous output from -40° to +60°C, derated to 25W at +85°C.

  • PC/104-Plus Form Factor
    Industry standard form factor stacks with compatible CPUs and expansion modules.
  • Input Protection
    Diode protected against input polarity reversal. Transient voltage suppression provides enhanced ESD protection.
  • Efficient Design
    Engineered for maximum power efficiency and optimum thermal management.
  • Power Connectors
    Power is provided to the PC/104 stack via the PC/104-Plus power pins or a 4-position screw terminal connector.
  • TTL Level Disable Inputs
    Enables unused power supplies to be shut down to save power or can be used as on/off power switches.
  • RoHS-compliant
    Full compliance with EU Directive 2002/95/EC for devices used in Europe.


The EPM-PS1 is a plug-in 50 Watt power supply in a standard PC/104 3.55” x 3.775” (90 mm x 96 mm) format. It is designed to power a stack of PC/104 and/or PC/104-Plus boards. The compact design is an excellent choice for systems with limited space for an internal or external power supply. This high reliability DC/DC switching power supply is designed for use in applications such as transportation, medical, defense, and autonomous robotics. It is ideal for OEMs where long-term availability (5+ years) and rugged design are critical. When used with VersaLogic’s other stackable CPU and expansion boards the EPM-PS1 enables complete system designs.

The EPM-PS1 power supply provides up to 50 Watts of continuous output power. This PC/104-Plus expansion module is protected against diode polarity reversal and over-current of up to 40 Volts.

Ordering Information
Model Input Voltage Range Power Output RoHS
VL-EPM-PS1a +9V to +40V DC 50W continuous


General Board Size PC/104 standard: 3.55" x 3.775" (90 mm x 96 mm)
Switching Frequency 5V output: 200 KHz fixed
±12V output: 1.2 MHz fixed
Expansion PC/104-Plus: PCI, ISA
RoHS Compliant
Environmental Operating Temperature -40° to +60°C at 50W, derated to 25W at +85°C*
Storage Temperature -40° to +85°C
Thermal Shock 5°C/min over operating temperature
Humidity Less than 95%, noncondensing
Vibration, Sinusoidal Sweep MIL-STD-202G, Method 204, Modified Condition A: 2g constant acceleration from 5 to 500Hz, 20 minutes per axis
Vibration, Random MIL-STD-202G, Method 214A, Condition A: 0.02g˛/Hz (5.35g rms), 15 minutes per axis
Mechanical Shock MIL-STD-202G, method 213B, Condition J: 30g half-sine, 11 ms duration per axis
Input Power Requirements +9V to +40V DC, 75W
Protection Transient voltage suppression and fuse
Output 5V 50W (10A) max. continuous from -40° to +60°C, derated to 25W (5A) at +85°C*
±12V 1.8W (150 mA) each max. continuous from -40° to +85°C
Voltage Ripple 5V output: 30 mV peak-to-peak at 50% load
±12V output: 30 mV peak-to-peak at 50% load
Regulation Less than 1%
Protection Overload protection and transient voltage suppression
*Power Derating
Data represents standard operation at 25°C with 5.0V supply unless otherwise noted. Specifications are subject to change without notification. PC/104 and PC/104-Plus are trademarks of the PC/104 Consortium.