Multiple-output supplies gain military approval

Lambda's compact NV-175 and NV-350 multiple-output power supplies have been granted approval in line with the stringent demands of US military standard MIL-STD-801E.

After extensive testing, Lambda's compact NV-175 and NV-350 multiple-output power supplies have been granted approval in line with the stringent demands of US military standard MIL-STD-801E.

The approval covers the functional shock, transit drop, bench handling, basic transportation and shipboard vibration requirements of the standard.

Designed to demonstrate that the units are capable of withstanding the rough handling and harsh service conditions associated with military use, the tests were carried out on standard power supplies taken from normal production.

They included subjecting the units to 40g shocks three times on each of its axes, a 1.2m drop test on each face of the unit, vibration sweep tests covering the range 10 to 500Hz and random vibration tests from 1 to 50Hz.

At the end of the end of the tests, the units were confirmed to be mechanically undamaged and in full working order.

The NV-175 supplies covered by the new approval have an exceptionally high power density of 9.3W/in3 and, with dimensions of just 32 x 76 x 125mm, they achieve a continuous power rating of 180W at ambient temperatures up to 50C.

They are available without a fan, for applications where cooling airflow already exists, and with an integral temperature-controlled low-noise fan for applications which require a self-cooled supply.

Between one and five independent outputs can be specified, with voltages from 0.9 to 28V.

For applications requiring more power, NV-350 power supplies also feature exceptionally compact construction, but have a maximum continuous rating of 350W.

For these units, which are supplied as standard with an integral fan, up to six outputs can be specified.

All of Lambda's NV-series power supplies use the company's patented multiresonant topology (MRT), which dramatically reduces switching losses and, therefore, allows high efficiencies - typically around 90% - to be achieved.

MRT also features soft switching, which minimises the generation of switching harmonics, ensuring that the supplies offer excellent EMC performance.

In addition to their new MIL-STD-801E approval, NV-series power supplies carry the CE marking in line with the Low Voltage Directive and they are approved to a wide range of international standards.

These include EN55022 Class B for electromagnetic emissions, EN61000-series standards for electromagnetic immunity, EN60950 and EN61010 safety standards, and the demanding EN60601 standard for medical applications.

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