Low voltage output dc/dc converters target space applications
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International Rectifier has introduced the GH series of radiation hardened dc/dc converters. The new 50W devices are designed to maximise efficiency for onboard spacecraft applications requiring long mission life up to 15 years.
The range is aimed at designs using new digital signal processors and fpga technologies that require a supply voltage down to 1V. Key features include 18 to 40V input range, total ionisation dose of more than 100krad, single event effect with rated LET greater than 82MeV.cm2/mg, internal EMI filter complying with most major satellite power buses, and a weight of less than 110g.
According to IR, the GH series was developed using a space level design methodology that includes selection of 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 to 5V, with current rating of up to 20A and 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 features include remote sense compensation, remote output on/off control via Inhibit pin, input under voltage protection with under voltage lockout and synchronisation for applications with multiple converters.
