Energy-efficient dc-dc converters suit spacecraft applications

International Rectifier introduces the GH Series of radiation hardened (RAD-Hard) dc-dc converters, 50-W devices designed to maximize efficiency for spacecraft applications with mission lives to 15 years. The GH Series is suitable for designs using new digital signal processors and FPGA technologies requiring supply voltages as low as 1.0 V.

Key features include 18 to 40 V input range, total ionization 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 satellite power buses, and a weight of less than 110 g.

The GH Series was developed using a space-level design process that included selection of established and reliable components and fully de-rated to the requirements of MIL-STD-1547. Devices feature magnetically-coupled feedback to ensure robust operation under the intended radiation environments.

Output models range from 1.0 V to 5.0 V with current rating to 20 A and efficiency to 87%. Output is adjustable with an external resistor for a precise voltage setting. Other key features include remote sense compensation, remote output on/off control via an Inhibit pin, input under-voltage protection with under-voltage lockout (UVLO), and synchronization for applications with multiple converters.

For more information, contact International Rectifier, 233 Kansas St., El Segundo, CA 90245. Phone: (310) 252-7105.