MC33931EK

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The MC33931EK is a dedicated full-bridge motor driver from NXP® Semiconductors, designed for power motor control applications such as fan motor speed control, actuator control or robot joint control. This integrated circuit (IC) comprises two power halves that support different voltage ranges for each of the two outputs, indicating that it has the capability of driving bi-directional brushless DC (BLDC) motors, along with DC-brushed motors and stepper motors. The IC also has voltage sensing, allowing it to monitor the motor voltage and make decisions based on the voltage value. Furthermore, the motor control system can also be programmed to control up to two pairs of stepper motors.

The MC33931EK is a full- bridge motor driver based on NXP’s MC33931 Motor Control Galvanic Isolation System, which includes two H-bridges (a switched mode on each half-bridge) and a voltage regulator. It also contains an integrated power-on reset circuit, a dead time control circuit, and preload and shutdown. The MC33931EK features a dual-output voltage range, a dual-output current sense, low dead-time and crossover distortion, and PWM, speed control and direction control inputs.

The MC33931EK works principally by providing two power stages for driving the motors, and the two power stages are controlled by two independent half bridges. These two halves bridge the two motor outputs and are comprised of the main block NMOS driver, logic and control circuitry, preload and shutdown logic, and a voltage regulator. Its two power stages are designed to power motor outputs from 15 A up to 30 A peak with symmetric or asymmetric output currents. The motor outputs can be both positive and negative, so the IC can drive AC currents as well as DC currents.

When the MC33931EK receives input signals controlling the direction, it will adjust the power stages and their associated half-bridges accordingly, which will dictate the direction of the current and the speed of the motor rotation. The IC also supports continuously adjusting the voltage output of each half bridge, in order to control and maintain the output current. The MC33931EK also provides preload and shutdown logic, to prevent sudden discharge of energy when each power stage is turned off.

In order to ensure that the voltage and current of the motor are accurately monitored and within an acceptable range, the MC33931EK implements a voltage sensing circuit. This circuit will monitor the voltage of each motor output and the total voltage output, and send error signals when any of the monitored values is outside of the acceptable range.

The MC33931EK can be used in a plethora of applications, including fan motor speed control, synchronous or AC induction-motors control, actuator control, robot joint control and BLDC motor control. The IC is also a useful tool for robot navigation as it can control two brushless stepper motors, allowing it to turn in specific angles. Lastly, the MC33931EK can also be used to control DC motors.

In conclusion, the MC33931EK is an integrated full-bridge motor driver from NXP® Semiconductors that supports a variety of motor types, including BLDC motors, stepper motors and DC-brushed motors. The IC includes two H-bridges and a voltage regulator, and it supports current sensing, voltage sensing and preload and shutdown logic. The MC33931EK can be applied to a multitude of applications such as fan motor speed control, actuator control, robot joint control and BLDC motor control, as it allows for bi-directional current, as well as allowing for speed and direction control.

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