DC/DC Converter Dual Output – Railway Applications

The DCW102R series DC/DC converters are designed for use on Rail Rolling Stock and for many extremely harsh environments.V1 is regulated, with the second output tracking.

This rugged, industrial quality DC/DC converter uses a field-proven topology to generate up to 100W continuous power, depending on the input/output configuration (i.e. efficiency).

It is a mature design with a track record in hundreds of applications. The series has large design headrooms and it is rated for operation over a -25 to +70oC temperature range. It is cooled by conduction via baseplate to a heatsinking surface and by natural convection.

These models are fully ruggedized and conformal coated for immunity to shock, vibration, humidity, moisture, dust and insects. This chassis-mount design is optimized for low component count and high efficiency. The use of components with established reliability results in a high demonstrated MTBF.Customized versions are also available.

Rugged Mechanical Designs

Helios power supplies are ruggedly constructed and can be customized for specific mechanical requirements. Standard mechanical packages and ruggedization options include:

  • Chassis and wall-mountable units in vented conduction/convection or fan-cooled enclosures
  • DIN-rail and open-frame format available for many designs
  • Plug-in (Eurocard) format for modular power systems in 19 inch or 23-inch racks
  • Conformal coating and ruggedizing are standard
  • Full encapsulation (potting) in a thermally conductive MIL-grade silicon rubber compound with UL94V-0 flammability rating for immunity to high levels of shock and vibration, humidity, moisture, dust, salt, oil, insects and other contaminants
  • Enclosure in rugged, IP66- or IP67-rated waterproof, dustproof and explosion-proof die-cast aluminium packages. These enclosures also protect internal electronic boards from condensation and the ingress of oil, salt, sand, insects and other environmental contaminants
  • Custom connections
  • Portable DC Power Supplies


Model Input Options  ( V) Standard Outputs( V, A) Power
DCW102R 24V, 36V, 48V
72V, 110V
V1:     12V  2A
V2:     12V  2A
These DCW102R is manufactured to order with customer specifying the
input / output voltage combinations.
The final part number will be allocated at the time of order.
The units can be supplied with two isolated outputs that can be
connected in series, or as a ± output with common return.


Operating input voltage range 24VDC   ( 14.4 ~ 34 )
36VDC   ( 22 ~ 51 )
48VDC   ( 20 ~ 67)
72VDC   ( 43 ~ 101)
96VDC   ( 58 ~ 135)
110VDC   ( 66 ~ 154)
Input Protection Reverse polarity protection.Inrush current limiting Lower voltage than specified will not damage unit
Output Voltage Customer Specified
Regulation ±1% Line / Load combined
Operating Temp:  -25ºC to +70ºC cold plate temperature
Efficiency Model dependent , typically 80-90%
Dynamic Response Max ±5% diviation for 10% – 50% load step wuth 1msec recovery
MTBF >150,000 hrs

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