LX7720 Datasheet | Microsemi

Description The LX7720 is a spacecraft motor driver that is radiationhardened by design and works with either a space FPGA controller such as RTG4, RTAX-S/SL, and RT Polar Fire, or a space MCU such as SAMRH71F20, SAMV71Q21RT, and SAM3X8ERT. The LX7720 contains four half-bridge drivers with floating current sense for motor coil driving, six bi-level inputs for sensing Hall effect sensors or rotary encoders, and a resolver or LVDT interface to digital with primary coil driver. The LX7720 works with an FPGA or MCU system controller to provide a plete closed loop motor driver with coil current feedback and rotation or linear position sensing. With flexible programming, the bined system can provide motor control for stepper motors, brushless DC and permanent magnet motors. Position sensing supports encoders, Hall effect sensors, resolvers, synchros, and LVDTs. FPGA and MCU IP modules are available to support motor driving functions from open loop cardinal step driving to space vector modulation using field-oriented control. The LX7720 contains 7 sigma delta modulators for analog sampling. Sinc3 filtering and decimation is performed in the FPGA or microcontroller with available IP modules. Four of the modulators sample the voltage across floating current sense inputs and three modulators sample differential analog inputs such as the outputs of a resolver transformer. Speed versus accuracy tradeoffs can be exploited. The LX7720 supports a ground potential difference between the motor and signal grounds in the range of -10V to +8V and motor supply voltages up to 60V. Resolver or LVDT carrier frequencies from 360Hz to 20k Hz are supported. The LX7720MFQ is packaged in a 132 pin hermetic ceramic quad flat pack. The LX7720MMF is packaged in a lead-free 208 pin non-hermetic plastic quad flat pack. Both parts operate over a -55°C to 125°C temperature range, and are radiation tolerant to 100krad(Si) TID and 50krad(Si) ELDRs, as well as single event effects. Features - Four...