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Topic presentation on:- Motor Driver IC (L293D)

Presented by:- Amit Kumar (EEE/14/1103)

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Importance of topic presentation?The topic presentation improve my thinking and

knowledge skill on a particular point .By the topic presentation my communication skill

increase.By this section I research my work and knowledge level

and then full-fill for the further.

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Introduction

What is L293D ?Pin description of L293D.Circuit diagram of L293D.Working procedures. Description of H-Bridge.Application of L293D.

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What is L293D ?L293D is a Motor driver integrated circuit which is used

to drive DC motors rotating in either direction. It is a 16-pin IC which can control a set of two DC motors

simultaneously. It means that we can control two DC motor with a single L293D IC.

Dual H-bridge Motor Driver integrated circuit(IC). The L293D uses 5V for its own power and external power source is needed to drive the motors, which can be up to 36V and draw up to 600mA.

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Pin description of L293D

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Circuit diagram of L293D

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Working procedures Drivers are enabled in pairs, with drivers 1 and 2 being enabled by the

Enable pin. When an enable input is high (logic 1 or +5V), the associated drivers are enabled and their outputs are active and in phase with their inputs.

When the enable pin is low, the output is neither high nor low (disconnected), irrespective of the input.

Direction of the motor is controlled by asserting one of the inputs to motor to be high (logic 1) and the other to be low (logic 0).

To move the motor in opposite direction just interchange the logic applied to the two inputs of the motors.

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Description of H-BridgeIt is an electronic circuit which enables a voltage to be applied

across a load in either direction. It allows a circuit full control over a standard electric DC motor.

That is, with an H-bridge, a microcontroller, logic chip, or remote control can electronically command the motor to go forward, reverse, brake, and coast.

H-bridges are available as integrated circuits, or can be built from discrete components.

The term "H-bridge" is derived from the typical graphical representation of such a circuit, which is built with four switches, either solid-state (eg, L293/ L298) or mechanical (eg, relays).

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Continue ….

S1 S2 S3 S4 Result 1 0 0 1 Motor rotates in one direction 0 1 1 0 Motor rotates in opposite direction 0 0 0 0 Motor free runs (coasts) 0 1 0 1 Motor brakes 1 0 1 0 Motor brakes

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Continue…..To power the motor, you turn on two switches that are

diagonally opposed.

.

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Application of L293D.It can be easily used to control the motor, so we can easily

control robot (manual robot).It can be used in commercial robot. Gesture control which is a emerging technology finds

many applications in various fields. The work we have done is a little part of it. Controlling the motion of wheeled robot through this system is not the only thing, with further research we can take it too far.

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Any query?

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