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High-reliability dc-dc converters

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INTERNATIONAL Rectifier, represented by Arrow Electronics , has introduced the new M3G family of "off-the-shelf" radiation-hardened, high-reliability dc-dc converters that streamline costly space industry design cycles.

The M3G converters are complete single-ended forward buck converter "building blocks" for 28V, 50V and 70V input power buses, in single, dual or triple output configurations.

Each module is assembled, tested and documented to reduce or eliminate cycle time needed for analysis and documentation of "in-house" circuit designs.

The small size, low mass and ruggedness makes the M3G converters ideal for geo-stationary and deep space satellites, and communication systems.

The M3G family is hardened to withstand total ionising dose (TID) of 200K rads, with single event effect (SEE) rating of greater than 82MeV-cm2/mg.

The new converters simplify integration since EMI filtering as well as frequency and phase synchronisation, are built-in.

In addition, the M3G devices are made with hybrid technology, enabling a compact footprint of approximately 43.75cm3 at less than 80gm in flight-qualified power systems.

All components are stress de-rated to meet the requirements of MIL-STD-975, MIL-HDBK-1547 and GSFC PPL-21.

Completed analysis and documentation includes radiation susceptibility, thermal, electrical stress, worst case, failure mode and effect analysis, reliability as well as extensive radiation test data, supporting the design documentation.

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