Pont-H L293D Quadruple
published: 22 November 2019 / updated 22 November 2019
The L293 and L293D devices are quadruple high-current half-H drivers. The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V. The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V. Both devices are designed to drive inductive loads such as relays, solenoids, DC and bipolar stepping motors, as well as other high-current/high-voltage loads in positive-supply applications.
Each output is a complete totem-pole drive circuit, with a Darlington transistor sink and a pseudo- Darlington source. Drivers are enabled in pairs, with drivers 1 and 2 enabled by 1,2EN and drivers 3 and 4 enabled by 3,4EN.
The L293 and L293D are characterized for operation from 0°C to 70°C.
| PIN | TYPE | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| 1,2EN | 1 | I | Enable driver channels 1 and 2 (active high input) |
| 1A 2A 3A 4A | 2, 7, 10, 15 |
I | Driver inputs, noninverting |
| 1Y 2Y 3Y 4Y | 3, 6, 11, 14 |
O | Driver outputs |
| 3,4EN | 9 | I | Enable driver channels 3 and 4 (active high input) |
| GROUND | 4, 5, 12, 13 |
--- | Device ground and heat sink pin. Connect to printed- circuit-board ground plane with multiple solid vias |
| Vcc1 | 16 | --- | 5-V supply for internal logic translation |
| vcc2 | 8 | --- | Power VCC for drivers 4.5 V to 36 V |
Function Table (Each Driver)(
| INPUTS | OUTPUT (Y) | |
|---|---|---|
| A | EN | |
| H | H | H |
| L | H | L |
| X | H | Z |
Bidirectional DC Motor Control
| EN | 1A | 2A | FUNCTION |
|---|---|---|---|
| H | L | H | Turn right |
| H | H | L | Turn left |
| H | L | L | Fast motor stop |
| H | H | H | Fast motor stop |
| L | X | X | Free-running motor stop |