SN75114N

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Interface - Drivers, Receivers, Transceivers is an important part on electronic circuits, as these components are responsible for managing the data communications between parts of the circuit and between devices. SN75114N is an integrated circuit from TI (Texas Instruments) used as a 4-channel driver, includes over-current protection and up to 32mA of peak output current. This device is used in many applications, mainly for the motion control using stepper motors. The main applications and working principle of SN75114N will be discussed in this article.

The SN75114N is used mainly in stepper motor control, allowing a stepper motor to move accurately in one direction in steps. Even though SN75114N is a 4-channel driver, this device is mainly used in 2-phase or 3-phase type stepper motors. The device takes input data and the level of control current of each individual driver is set through a voltage regulator. The output of the driver is a 4-phase current controlled PWM signal which is generated according to the input data.

The working principle of the SN75114N is relatively simple. It consists of four internal linear current-drivers, that are able to convert small control signals into high current driver signals. The SN75114N also includes an over-current protection circuit and temperature compensation. This protection circuit monitors the output current of the driver and will shutoff instantly when the output current exceeds the specified level. With this method, the damage of the motor is minimized.

The power consumption of the SN75114N is relatively low. When no motor is connected, the input current can be as low as 5µA, while when a motor is connected, it can reach up to 30mA. The device features a wide operating voltage range, from 9V to 36V, and can support peak output current up to 32mA. The switching frequency that allows the full usage of the peak current is between 20kHz and 200kHz, decrease the dissipation of the heat problem.

Nowadays, the SN75114N can be found in many motion control applications, such as automotive windshield wipers, assembly machines, robotics, industrial robots, home appliance’s, textile equipment and copier scanners. The SN75114 device is also used in distributed control systems, in which control signals are generated and distributed to several actuators with the help of this device, allowing individual control of each actuator.

The SN75114N is a reliable and cost-effective device, which makes it a great choice for many applications involving data-control and stepper motors. With its wide application base, the device is also suited for prototyping or quick replica of existing solutions and brings with it the convenience of easy integration. The integrated protection and temperature compensation circuitry makes it even more reliable, capable of using and protecting the motor in the most extreme conditions.

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