Sealed power modules withstand harsh environments – in distribution

July 14, 2016 // By Graham Prophet

Sealed high-efficiency and compact AC-DC modules are presented as power units suitable for outdoor displays and harsh industrial control environments

Distributor Luso Electronics has maker Efore’s ROAL-branded DDP400 high efficiency AC-DC sealed power module, offering efficiency, small form factor and convection or conduction cooling capability. The sealed supply is applicable for digital outdoor displays, LED lighting, and industrial control or clean room equipment where fan noise or moving air is not acceptable.


At a typical 94% efficiency, the DDP400 is rated for 400W of regulated DC power through the full 90 to 264V AC input range; the module is 20% smaller than alternative 300W modules enabling designers to integrate it into 1U applications.


In a form factor of 83.05 x 211.84 x 41.91mm, the sealed IP67 rated package ensures protection against dust and water immersion up to 1m for up to 30 minutes, and can be installed in contact with thermally-conductive (cold wall) part of the system so to transfer heat by conduction.


The DDP series is available in four standard output voltages: 12, 24, 36, 48V DC, with an auxiliary 12V DC and a stand-by 5V DC outputs.


When conduction cooled, or convection cooled with its optional heat sink assembly, the module can deliver full output power from -20 to 50°C. It can operate up to 70°C with de-rating, and -30°C. Protection features include fuse on each AC lines, input under-voltage lockout, output over-current, output short-circuit, output over-voltage and over-temperature. The MDP400, a companion product of the DDP400 is aimed at medical lighting and power applications with full compliance with UL/IEC safety standards for medical equipment. Other package formats are available.


Luso Electronics;