The highly integrated radiation-tolerant by design motor controller significantly reduces weight and board space relative to conventional discrete motor control circuits for satellite manufacturers sensitive to area and weight challenges. The LX7720 is the second member of the SSM family, joining the LX7730 radiation-tolerant telemetry controller and works with a field programmable gate array (FPGA).
“As the reduction of weight and board space on satellites continues to challenge the aerospace market, we are pleased to reinforce our commitment to developing innovative solutions with this highly reliable radiation-tolerant motor controller,” said Dorian Johnson, product line manager for Microsemi’s analog mixed signal space products. “This SSM device enhances our ever-growing space product portfolio as we continue to strengthen our leadership position and maximize the amount of Microsemi content on these sophisticated satellites.”
The LX7720 has already been adopted by customers to enable various motor control applications in space robotics and human-rated space programs. Additional target applications for the device include motor driver servo control, linear actuator servo control and driving stepper, brushless direct current (BLDC), and permanent-magnet synchronous (PMSM) motors. These motors can be found on satellite busses (solar panel deployment and driving reaction wheels), on spacecraft payload instruments (multi-axis pointing mechanisms for antennas and laser terminals; precise motion control of lenses, filters, and mirrors), and in robotics applications (pressure-sensitive motion control).
The LX7720 includes four half-bridge N-channel MOSFET drivers, with four floating differential current sensors and a pulse modulated resolver transformer driver. There are three differential resolver sense inputs and six bi-level logic inputs as well as fault detection. It is designed to be tolerant to 100 krad total ionization dose (TID), 50 krad enhanced low dose radiation sensitivity (ELDRS) and single event immune
Production prototypes are now available.
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