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Texas Instruments introduces 70W BLDC drivers
Claimed to be the industry’s first 70W brushless DC (BLDC) motor drivers to provide code-free, sensorless trapezoidal and field-oriented control (FOC).

The MCF8316A sensorless trapezoidal control motor driver includes a patented, precise automatic dead-time compensation technique that compensates for current distortion to optimise motor acoustic performance. It also includes variable trapezoidal control techniques to reduce motor noise. It extracts motor parameters, enabling designers to quickly tune a motor while delivering consistent system performance regardless of motor manufacturing variations.

The MCT8316A sensorless trapezoidal control motor driver can reach a maximum motor electric speed of 3.5kHz, which is faster than any other code-free, sensorless motor driver, says TI. It speeds system response in applications such as robotic vacuums that require fast and precise motor control. Only five hardware pins can be used to tune a motor, simplifying systems by eliminating the need for a microcontroller interface.

The MCF8316A includes a patented, precise automatic dead-time compensation technique that compensates for current distortion to optimise motor acoustic performance. The MCT8316A includes variable trapezoidal control techniques to reduce motor noise.

The drivers integrate three gate drivers and six high- and low-side MOSFETs with 50mΩ of on-state resistance each, for up to 70W of power and 8A of peak current for 12- and 24V systems. There is also a low-dropout regulator, power MOSFETs, DC/DC step-down regulator and current-sense amplifiers, eliminating up to 18 discrete ICs to reduce board space by as much as 70%.

The motor drivers include commutation control algorithms to manage critical functions such as motor fault detection and implement protection mechanisms. Sensorless technology determines rotor position and eliminates the need for external Hall sensors.

According to the company, both drivers enable engineers to spin a BLDC motor in less than 10 minutes and can be used in industrial systems from major and small home appliances, and medical applications such as ventilators and continuous positive airway pressure (CPAP) machines.

Both motor drivers provide advanced real-time control capabilities to help engineers achieve industry-leading acoustic performance in applications such as air purifiers, refrigerators, washing machines and fans.

Pre-production versions of the MCF8316A and MCT8316A are available in a 40-pin, 5.0 x 7.0mm quad flat no-lead package.



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