L293d motor driver circuit datasheet free#

But if the current requirement is not too high and all that is needed is a single package which does the job of driving a small DC motor in two directions, L293D IC. H-bridges can be built from scratch using relays, mosfets, field effect transistors (FET), bi-polar junction transistors (BJT), etc.

Lastly turning on A & C at the same time or B & D at the same time shorts the entire circuit.

L293d motor driver circuit datasheet free#

Turning off all the switches gives the motor a free wheel drive.

Turning on Switches A and B will stop the motor (Brakes).

Turning on Switches B and C makes the motor rotate anti-clockwise.

Turning on Switches A and D makes the motor rotate clockwise.

Turning these switches ON and OFF can drive a motor in different ways.

Out of many, one of the most common and clever design is a H-bridge circuit where transistors are arranged in a shape that resembles the English alphabet 'H'.ДЄs you can see in the image, the circuit has four switches A, B, C and D. This can be achieved by using four switches that are arranged in an intelligent manner such that the circuit not only drives the motor, but also controls its direction. To reverse the direction of the motor reverse its polarity. Turning a motor ON and OFF requires only one switch to control a single motor in a single direction. In most cases, a transistor can act as a switch and perform this task which drives the motor in a single direction. Motor driver is basically a current amplifier which takes a low-current signal from the microcontroller and gives out a proportionally higher current signal which can control and drive a motor. This entire process is done by what is known as a motor driver. Since motors require more current then the microcontroller pin can typically generate, you need some type of a switch (Transistors, MOSFET, Relay etc.,) which can accept a small current, amplify it and generate a larger current, which further drives a motor. Generally, even the simplest robot requires a motor to rotate a wheel or performs particular action. 12.1 L293D Motor Controller and Driver 12.1.1 Motor Driver and H-bridge basics