SAN JOSE, Calif., June 24, 2019 /PRNewswire/ -- Designers can now
improve motor efficiency and reduce vibration using the
MAX40056 bi-directional current sense amplifier with
patented pulse-width modulation (PWM) rejection from Maxim
Integrated Products, Inc. (NASDAQ: MXIM). This high speed,
wide-bandwidth amplifier extends Maxim's industry leadership in
precision, high-voltage current sense amplifiers into motor control
applications.
- Details about MAX40056: http://bit.ly/MAX40056
- Hi-res image: http://bit.ly/MAX40056_Image
- Block diagram: http://bit.ly/MAX40056Block_Diagram
Creating a motor control system requires precise current sensing
and measurement of motor winding currents. A commonly used approach
is to infer winding currents by performing ground or supply
referenced measurements in the bridge circuit. Direct winding
current measurement is a simpler and more accurate method, but the
implementation is challenging due to the high common mode swing of
the PWM signal. Adoption of this approach has been limited by poor
PWM rejection and slow settling speed of existing solutions.
MAX40056 rejects PWM slew rates of greater than 500V/µs and
settles within 500ns to provide 0.3 percent accurate, full-scale
winding current measurement. The patented PWM rejection scheme
achieves 4 times faster settling time than competitive offerings,
allowing motor control designers to increase drive frequency or
decrease minimum duty cycle without sacrificing measurement
accuracy. Higher PWM frequency smoothes out the current flow and
reduces torque ripple, resulting in more efficient motor operation.
Accurate winding current measurement at low duty cycle helps reduce
or virtually eliminate vibration when the motor is running at a
slow speed. MAX40056 has a wide common mode voltage range of -0.1V
to +65V and a protection range of -5V to 70V to ensure the
inductive kickback does not damage the IC. With bi-directional
sensing capability, it is ideal for DC motor control, base station,
datacenter, battery stack and many other applications which require
precise current measurements in noisy environments.
Key Advantages
- Fastest Settling Time: patented technique rejects common
mode PWM signals and yields fastest settling time within
500ns.
- Highest Accuracy: accurate direct motor winding current
measurement at 4 times higher PWM frequency or 4 times lower duty
cycle than competitive offerings.
- Increased Performance: improved motor efficiency and
reduced vibration.
Commentary
- "Complex and highly sensitive systems such as self-driving and
autonomous vehicles require extremely accurate sensing feedback to
provide a high level of functionality and increased safety," said
Rahul Kumar, analyst at Allied
Market Research. "The industry is ripe for a solution that can
provide increasingly precise motor controls, especially with the
expected autonomous vehicle market growth predicted to reach
$556.67 billion by 2026."
- "MAX40056's high PWM rejection and fast settling time obtains
current measurements inline with the motor windings for highest
accuracy and greatest control in sensitive applications," said
Dimitry Goder, director of
applications and product definition for the Core Products Group at
Maxim Integrated. "Its unique design architecture unlocks higher
performance and future innovation in motor control
applications."
Availability and Pricing
- The MAX40056 is available at Maxim's website for $1.19 (1000-up, FOB USA); also available from authorized
distributors
- The MAX40056EVKIT evaluation kit is available for
$69
About Maxim Integrated
Maxim Integrated develops
innovative analog and mixed-signal products and technologies to
make systems smaller and smarter, with enhanced security and
increased energy efficiency. We are empowering design innovation
for our automotive, industrial, healthcare, mobile consumer and
cloud data center customers to deliver industry-leading solutions
that help change the world. Learn more at
https://www.maximintegrated.com.
Contact:
|
Mariel
Santos
|
|
408-601-3145
|
|
Mariel.Santos@maximintegrated.com
|
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SOURCE Maxim Integrated Products, Inc.