Rad-hard convertors claim top efficiency

International Rectifier has introduced the LS Series of radiation-hardened low-voltage single- and dual-output DC/DC convertor modules.

International Rectifier has introduced the LS Series of radiation-hardened low-voltage single- and dual-output DC/DC convertor modules.

The modules, which include an internal MIL-STD-461C CE03-compliant EMI filter, deliver isolated output voltages from 1.5 to 15.0V with typical efficiency ratings up to 83% - at least 5% more than the closest competing device.

By including the EMI filter, the new modules simplify power management circuits used in satellite applications, including low Earth orbit (LEO), middle Earth orbit (MEO), geostationary Earth orbit (GEO) as well as in scientific missions that have long life requirements of up to 15 years or radiation design requirements of 100krads.

The low-voltage convertors are made with a proven, patented design using discrete pulse width modulation circuitry and known radiation performance components derated per MIL-STD-975.

The devices are characterised with total ionising dose (TID) of greater than 100krad(Si), and single event effect (SEE) linear energy transfer (LET) of heavy ions greater than 82MeV.cm2/mg in accordance with MIL-STD-883.

The fixed-frequency, single-ended forward convertors switch at 575kHz.

Other features include 18 to 40V input range, magnetically coupled feedback to insure optimum cross-regulation when the loads are unbalanced, adjustable output voltage, and a device weight of less than 85g.

Datasheets and a radiation test report are available on the International Rectifier website.

Stress, thermal and worst case analysis reports for the modules are available on request.

These devices are subject to US export control laws and regulations.

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