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LX7720-ES

Description
Motor/Motion/Ignition Controllers and Drives
Categorysemiconductor    Power management IC    Motor/sport/ignition controller and driver   
File Size943KB,23 Pages
ManufacturerMicrosemiMicrochip
Environmental Compliance
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LX7720-ES Overview

Motor/Motion/Ignition Controllers and Drives

LX7720-ES Parametric

Parameter NameAttribute value
MakerMicrosemiMicrochip
Product CategoryMotor/Motion/Ignition Controllers and Drives
productFan / Motor Controllers / Drivers
typeHalf Bridge
Working power voltage2.1 V to 5.5 V
Output current50 mA
Working power current67 mA
Minimum operating temperature- 55 C
Maximum operating temperature+ 125 C
Installation styleSMD/SMT
Package/boxCQFP-132
Number of outputs4 Output
working frequency32 MHz
The output voltage18 V
Load voltage rating150 V
Factory packaging quantity1
Preliminary Datasheet
LX7720
Radiation Tolerant Power Driver with
Rotation and Position Sensing
Description
The LX7720 provides four half-bridge drivers with floating
current sense for motor coil driving, six bi-level inputs for
sensing rotary encoders, and a resolver to digital interface
with primary coil driver. When used with an FPGA, the
LX7720 provides a complete closed loop motor driver with
coil current feedback and rotation or linear position
sensing. With flexible FPGA programming, the combined
system can provide motor control for Stepper motors,
Brushless DC and Permanent Magnet motors. Position
sensing supports encoders, Hall sensors, resolvers,
synchros, and LVDTs. FPGA 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; the sinc3 filters and decimation is performed in
the FPGA with available IP module. 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 of up to 10V and
motor supply voltages up to 200V. Resolver carrier
frequencies from 360Hz to 20kHz are supported. The
LX7720 offers 1kV HBM ESD pin protection on all sensor
and bi-level pins. It is packaged in a 132-pin ceramic quad
flat pack and operates over a -55°C to 125°C temperature
range. It is radiation tolerant to 100krad TID and 50krad
ELDRs as well as single event latch up immune up to
87.85MeV·cm
2
/mg and 125°C (fluence of 1e8
particle/cm
2
).
Features
Four half-bridge Nch MOSFET drivers
Four floating differential current sensors
Pulse modulated resolver transformer driver
Three differential resolver sense inputs
Six bi-level logic inputs
Fault detection
Radiation Tolerant: 100krad TID, 50krad
ELDRS, Single Event
Applications
Motor driver servo control
Linear actuator servo control
Stepper, BLDC, PMSM motor driver
Figure 1 ·
Product Highlight
June 2018
© 2018 Microsemi Corporation
LX7720 rev 0.5
1
1
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