CURRENT-SENSE
AMPLIFIER
Texas Instruments (TI) has introduced a new current-sense
amplifier for in-line motor phase
current measurement that improves
overall motor efficiency compared to
existing current-sense amplifiers. The
INA240 offers enhanced pulse-width
modulation (PWM) rejection for
systems running at up to 80V to
support a variety of applications such
as motor control, solenoid control,
and power delivery systems. Key
features and benefits include:
• Enhanced PWM rejection for
improved motor efficiency: The
presence of high speed in-line PWM
motor control systems requires high
AC and DC accuracy. The INA240’s
enhanced PWM rejection improves
transient suppression and gives
designers the ability to reduce their
blanking time, optimize the motor
control algorithm, and ultimately
improve motor efficiency.
• Flexible for a variety of motor
applications: The INA240 operates at
PWM rates in excess of 100 kHz,
with switching-edge rates as high as
10 V/ns while enabling system
voltages as high as 80V. In addition,
to address the needs for a wide
range of systems, this device supports
the negative voltages (-4V) induced
by the inductive kickback of the
motor.
• Industry-leading performance
and accuracy: The INA240 has one
of the industry’s best combinations of
low offset voltage ( 5 µV), offset drift
( 50 nV/°C), gain error, and drift
performance (0.05 percent and 0.5
ppm/°C, respectively). The device
also provides an excellent AC
common-mode rejection ratio
(CMRR) of 93 dB at 50 kHz. The
INA240 delivers performance over a
wide range of operating conditions.
• Enhanced performance for any
motor control solution: The INA240’s
precision is showcased in a 48V 10A
in-line three-phase high frequency
Gallium Nitride (GaN) inverter for
brushless motor reference design.
This BoosterPack™plug-in module
reference design is paired with a
C2000™ LaunchPad™ kit,
demonstrating how designers can use
the INA240 and LMG5200 GaN half-bridge power stage to reduce
switching losses over an extended
temperature range up to 125°C,
facilitate the use of higher PWM
frequencies, and reduce heatsinking
requirements.
The eight-pin INA240 is available
in a 3 mm x 4. 4 mm thin-shrink small
outline package (TSSOP). An
evaluation module is available for
$25.
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56 February 2017