Rad-Hardened motor controller consolidates essential functions into a single chip
by Staff Writers
Chandler AZ (SPX) Oct 28, 2020
The need to reduce size, weight and power (SWaP) on satellites and other space systems continues to challenge the aerospace market. Combining more than 20 commonly used functions into a single chip, Microchip Technology Inc. has announced the LX7720 radiation-hardened mixed signal motor controller, the latest addition to its Space System Manager (SSM) product family.
As the industry's first highly integrated radiation-hardened by design (RHBD) motor control integrated circuit (IC), the LX7720 significantly reduces weight and board space relative to conventional discrete motor control circuits. By reducing the number of components on a system, developers can inspect and test fewer parts, while also minimizing the physical points of potential failure due to a smaller number of connections and solder joints.
The LX7720 controller offers a unique solution for satellite manufacturers sensitive to board area and weight reduction by consolidating essential functions for the motor control and position sensing circuitry required for robotics, multi-axis pointing mechanisms and precise motion control of optical elements.
Microchip's controller combines four half-bridge N-channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) drivers, four floating differential current sensors, a pulse modulated resolver transformer driver, three differential resolver sense inputs, six bi-level logic inputs, power drivers via external Field Effect Transistors (FETs), loop control electronics for voltage or current control, position read-back (resolver, potentiometer, limit switches, etc.), fault detection and more into a single device.
"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 and highly integrated radiation-hardened motor controller," said Bryan J. Liddiard, vice president of Microchip's mixed signal linear business unit. "The LX7720 enhances our ever-growing space product portfolio as we continue to expand a total system solution for our customers building these sophisticated satellites."
The LX7720 serves as a mixed signal companion IC to the selected digital IC used in the application. Microchip's Radiation Tolerant (RT) PolarFire and RTG4 Field Programmable Gate Array (FPGA) products and recently announced SAMRH71 radiation hardened microcontroller (MCU) are ideal companion chips, from a single supplier.
The LX7720 is MIL-PRF-38535 Class V and Class Q qualified and has already been adopted by customers to enable various motor control applications in space robotics and human-rated space programs. It is the ideal solution for spacecraft applications involving motor driver servo control, linear actuator servo control and for driving stepper, brushless direct current (BLDC) and permanent-magnet synchronous (PMSM) motors. The LX7720 offers radiation tolerance to 100 krad Total Ionization Dose (TID), 50 krad to Enhanced-Low-Dose-Rate-Sensitivity (ELDRS) exposure and is single event immune.
Pricing and Availability
Soyuz MS-17 delivers resupply of Dosis-3D pouches
Paris (ESA) Oct 21, 2020
The Soyuz MS-17 spacecraft arrived to the International Space Station just three hours after launch on 14 October, with Roscosmos astronauts Sergei Ryzhikov and Sergei Kud-Sverchkov and NASA astronaut Kate Rubins on board. Aside from the human cargo, the Soyuz had space for some science, including one of ESA's longest-running experiments, Dosis-3D. Dotted around the International Space Station, these orange pouches collect information on radiation levels using a device called a dosimeter. Th ... read more
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