The LX7720 is the latest addition to Microchip’s Space System Manager (SSM) product family. It has been developed to reduce the weight and board space required compared to traditional discrete motor control circuits. The IC also requires less testing and inspections and has fewer physical points of potential failure.
The LX7720 consolidates the essential functions needed for motor control and position sensing for robotics, multi-axis pointing mechanisms and precise motion control of optical elements. It integrates four half-bridge N-channel 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 using external 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 is intended to be used as a mixed-signal companion IC to the circuit’s main digital IC. Microchip’s Radiation Tolerant (RT) PolarFire and RTG4 FPGA products and the recently announced SAMRH71 radiation hardened MCU are ideal examples of these type of digital ICs.
Hardware and software support for the device includes the LX7720 Daughter Board (DB) that interfaces with Microchip’s SAMRH71F20-EK Evaluation Kit. The DB can also connect to Microchip’s RTG4 FPGA Development Kit. The development platforms provide motor control software to allow application specific evaluation using the LX7720-DB.