Military-spec DC/DCs come off the shelf

A series of 4 to 35W DC/DC convertors is designed as a standard product family exclusively for defence and avionics applications.

XP Power has announced the MTC, a series of 4 to 35W DC/DC convertors designed as a standard product family exclusively for defence and avionics applications.

No compromise has been made in component selection or construction to make it adaptable for communications, industrial or transport applications, as is often the case with products from other vendors.

The MTC is a noncustom convertor based on commercial off-the-shelf (COTS) components and is available in 5, 15 and 35W ratings.

It offers substantial cost savings over traditional military power supplies and is available from stock to reduce system time to market.

The convertor meets the MIL-STD 810F specification for temperature, shock, vibration, bump, altitude, salt fog and other key parameters associated with military applications.

Suitable for systems with a nominal 28V input, it has a wide input range of 15.5V to 40V and can operate through transients of 10V for 10 seconds and up to 50V for one second, in accordance with MIL-STD 704B-F.

Input immunity, with the complementary filter module, designated MTF, meets MIL-STD 1275A/B and MIL-STD 704A.

EMI performance meets MIL-STD 461E with the filter installed.

Single output versions are available with output voltages of 3.3, 5, 12, 15 or 28V.

The MTC is fully featured to minimise external circuitry.

It includes an inhibit line, the ability to synchronise with an external frequency source, output voltage programmable by resistor or external voltage, thermal warning "battle mode" signal on the 35W units, overvoltage protection and overcurrent protection.

This comprehensive feature set, which minimises the total power system cost, is not found in other low power DC/DC convertors.

The power supply is housed in an extruded aluminium case with heat dissipating fins to remove heat by convection plus a base plate for effective heat conduction.

The board-mount convertor has mounting holes to enable it to be mechanically secured in order to improve thermal conduction and improve shock and vibration performance The MTC uses forward convertor topology with synchronous rectification at the output stage to maximise efficiency.

The nominal switching frequency of 450kHz provides the optimum balance of efficiency, power density and EMC performance.

The power conversion and control functions are on separate printed circuit boards to conserve board space and maximise power density.

The ambient operating temperature range is -40 to +100C at the baseplate, with -55C screened units available to order.

A complementary EMI filter module, the MTF, is rated at 50W and includes active surge and spike protection as well as high-performance EMI filtering.

This enables the MTC convertor to meet industry standards for EMI and Immunity.

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