Converter sees space
01 August 2011
High efficiency, low voltage output DC-DC converter is for spacecraft applications.
International Rectifier has introduced the GH Series of radiation hardened (RAD-Hard) DC-DC converters. The new 50 W devices are designed to maximise efficiency for onboard spacecraft applications requiring long mission life up to 15 years.
The GH Series of devices is suitable for designs using new digital signal processors and FPGA technologies that require a supply voltage as low as 1.0 V.
Key features include 18 V to 40 V input range, total ionisation dose (TID) of over 100 krad (Si), single event effect (SEE) (Heavy Ions) with rated LET greater than 82 MeV.cm2/mg, internal EMI filter complying with most major satellite power buses, and a weight of less than 110 g.
As a low output voltage, highly efficient solution, the GH Series addresses the ongoing need to reduce the overall size and weight of the system together with the increasing requirements of FPGA and other digital circuitry for increased bandwidth and data processing speed of spacecraft electronics.
The GH Series was developed using a proven space-level design methodology that includes selection of established reliable components and fully de-rated to the requirements of MIL-STD-1547. The devices feature magnetically coupled feedback to ensure robust operation under the intended radiation environments.
The output models range from 1.0 V to 5.0 V with current rating of up to 20 A and high efficiency up to 87%. Output is adjustable with an external resistor for a precise output voltage setting with the adjustment range of ±10% of the rated output voltage.
Other key features include remote sense compensation, remote output on/off control via Inhibit pin, input under-voltage protection with under-voltage lockout (UVLO), and synchronisation for applications with multiple converters.
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