The L293D is a 16 pin IC, with eight pins, on each side, dedicated to the controlling of a motor. There are 2 INPUT pins, 2 OUTPUT pins and 1 ENABLE pin for each motor. L293D consist of two H-bridge. H-bridge is the simplest circuit for controlling a low current rated motor.
Pin No. - Pin Characteristics
DUAL FULL-BRIDGE DRIVER Multiwatt15 ORDERING NUMBERS: L298N (Multiwatt Vert.). Pacitor of the power supply is too far from the IC, a. (Fast motor stop. Catalog Datasheet MFG & Type PDF Document Tags; 1986 - L293D motor driver. Abstract: L293Dne 16-pin L293D to control dc motor DC motor control using L293d SES5001 l293d PIN DIAGRAM all L293d L2931 L293 L293D application note.
- 1 - Enable 1-2, when this is HIGH the left part of the IC will work and when it is low the left part won’t work.
- 2 - INPUT 1, when this pin is HIGH the current will flow though output 1
- 3 - OUTPUT 1, this pin should be connected to one of the terminal of motor
- 4,5 - GND, ground pins
- 6 - OUTPUT 2, this pin should be connected to one of the terminal of motor
- 7 - INPUT 2, when this pin is HIGH the current will flow though output 2
- 8 - VCC2, this is the voltage which will be supplied to the motor.
- 16 - VCC1, this is the power source to the IC. So, this pin should be supplied with 5 V
- 15 - INPUT 4, when this pin is HIGH the current will flow though output 4
- 14 - OUTPUT 4, this pin should be connected to one of the terminal of motor
- 13,12 - GND, ground pins
- 11 - OUTPUT 3, this pin should be connected to one of the terminal of motor
- 10 - INPUT 3, when this pin is HIGH the current will flow though output 3
- 9 - Enable 3-4, when this is HIGH the right part of the IC will work and when it is low the right part won’t work.
Why 4 grounds in the IC?
L293d Motor Driver Ic Datasheet Pdf Free
The motor driver IC deals with heavy currents. Due to so much current flow the IC gets heated. So, we need a heat sink to reduce the heating. Therefore, there are 4 ground pins. When we solder the pins on PCB, we get a huge metalllic area between the grounds where the heat can be released.
Ic L293d
Why Capacitors?
L293d Datasheet Pdf
The DC motor is an inductive load. So, it develops a back EMF when supplied by a voltage. There can be fluctuations of voltage while using the motor say when suddenly we take a reverse while the motor was moving in some direction. At this point the fluctuation in voltage is quite high and this can damage the IC. Thus, we use four capacitors that help to dampen the extreme variation in current.