18.5 Motor Controller L293D
The Device is a monolithic integrated high voltage, high current four channel driver designed to accept standard DTL or TTL logic levels and drive inductive loads (such as relays solenoides, DC and stepping motors) and switching power transistors.
| To simplify use as two bridges each pair of chan- | |
|---|---|
| nels is equipped with an enable input. A separate supply input is provided for the logic, allowing operation at a lower voltage and internal clamp diodes are included. | The L293D is assembled in a 16 lead plastic packaage which has 4 center pins connected together and used for heatsinking |
Block Diagram
Absolute Maximum Ratings
| Symbol | Parameter | Value | Unit |
|---|---|---|---|
| VS | Supply Voltage | 36 | V |
| VSS | Logic Supply Voltage | 36 | V |
| Vi | Input Voltage | 7 | V |
| Ven | Enable Voltage | 7 | V |
| Io | Peak Output Current (100 µs non repetitive) | 1.2 | A |
| Ptot | Total Power Dissipation at Tpins = 90 °C | 4 | W |
| Tstg, Tj | Storage and Junction Temperature | – 40 to 150 | °C |
Pin Connections (Top View)
Figure 66: Pin Configuration L293D