Maxim pioneers the MAX40056 bi-directional current sense amplifier with patented pulse-width modulation (PWM) rejection which provides the designers to improve motor efficiency and reduce vibration.
“This high speed, wide-bandwidth amplifier extends Maxim’s industry leadership in precision, high-voltage current sense amplifiers into motor control applications”, said the company.
The device from Maxim 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 a 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.
The Key Applications include:
With bi-directional sensing capability, it is ideal for:-
- DC Motor Control
- Base Station
- Battery Stack
- Applications which require precise current measurements in noisy environments.
The Key Benefits offered by the MAX40056 include:
- 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.
Availability and Pricing
- The MAX40056 is available at Maxim’s website for $19 (1000-up, FOB USA); also available from authorized distributors
- The MAX40056EVKIT evaluation kit is available for $69.
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