INTERNATIONAL Rectifier (IR) has introduced the LS Series of radiation-hardened (RAD-Hard) low-voltage, single- and dual-output dc-dc converter modules.
The modules, which include an internal MIL-STD-461C CE03-compliant EMI filter, deliver isolated output voltages from 1.5V 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 converters are made with a patented design using discrete pulse width modulation circuitry and known radiation performance components de-rated per MIL-STD-975.
The devices are characterised with total ionising dose (TID) of greater than 100K Rad(Si) and single event effect (SEE) linear energy transfer (LET) of heavy ions greater than 82 MeV.cm2/mg in accordance with MIL-STD-883.
The modules include fixed-frequency, single-ended forward converters switch at 575kHz.
Other features include 18V 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.