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Low-power COTS DC/DCs target avionics, defense apps

Posted: 07 Sep 2006 ?? ?Print Version ?Bookmark and Share

Keywords:XP Power? MTC? DC/DC converters? defence? avionics?

XP Power's DC/DC converter for defense, avionics apps

XP Power MTC's series of 4W to 35W commercial-off-the-shelf (COTS) DC/DC converters, specifically for defense and avionics applications, touts features virtually unheard of at the low-power levels. These forward converters, working from a 15.5-40V input, include external frequency synchronization (400-500kHz), voltage trim (using a voltage source or resistor) and remote-sense circuitry; external control over thermal shutdown (i.e., for "battle" mode, where the user can't afford to shut down the system); and over-voltage and over-current protection.

Likewise, the company touts the mechanical design of these single-output (3.3-, 5-, 12-, 15- or 28V) board-mounted units, in 12 models, as well beyond the requirements of a typical COTS application. The supply has an extruded aluminum (sealed) enclosure with heat dissipating fins to remove heat by convection, plus baseplate for conduction cooling. Power components are bonded to the cooling plate, and no potting compounds are used. The power conversion and control functions are on separate PCBs to conserve board space and maximize power density. These units are rated for operation over -40C to 100C at the baseplate; specially screened units are available down to -55C.

The MTCs meet the MIL-STD 810F specification for temperature, shock, vibration, bump, altitude, salt and humidity. The converters will tolerate a 10V transient for 10s and up to 50V for 1s, in accordance with MIL-STD 704B-F. Input immunity with the supply's complementary MTF filter module, rated at 50W, meets MIL-STD 1275A/B and MIL-STD 704A. EMI performance meets MIL-STD 461E with the filter installed.

Both the MTC and MTF are available now. The MTC is priced from $120 each for the 4W unit to $260 each for the 35W version. The MTFs are $170 each. All prices are based on 100+ quantities.

- Vince Biancomano

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