Overview
The L293DD, produced by STMicroelectronics, is a monolithic integrated high voltage, high current four-channel driver. This device is designed to accept standard DTL or TTL logic levels and drive inductive loads such as relays, solenoids, DC motors, stepping motors, and switching power transistors. It is particularly useful in switching applications at frequencies up to 5 kHz. The L293DD is available in a 20-lead surface mount package, with 8 center pins connected together for heatsinking, enhancing thermal management.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VS) | 36 | V |
| Logic Supply Voltage (VSS) | 36 | V |
| Input Voltage (Vi) | 7 | V |
| Enable Voltage (Ven) | 7 | V |
| Output Current Capability per Channel | 600 mA | |
| Peak Output Current (non-repetitive) per Channel | 1.2 A | |
| Sink Output Saturation Voltage (VCE(sat)) | 1.2 - 1.8 V | |
| Clamp Diode Forward Voltage (VF) | 1.3 V | |
| Rise Time (tr) | 250 ns | |
| Fall Time (tf) | 250 ns | |
| Turn-on Delay (ton) | 750 ns | |
| Turn-off Delay (toff) | 200 ns | |
| Operating Temperature Range | -40 to 150°C |
Key Features
- Internal Clamp Diodes: Protects against back-EMF from inductive loads.
- Output Current Capability: 600 mA per channel, with a peak output current of 1.2 A (non-repetitive) per channel.
- Enable Facility: Each pair of channels has an enable input for simplified use as two bridges.
- Overtemperature Protection: Ensures the device operates within safe temperature limits.
- Logical '0' Input Voltage: Up to 1.5 V for high noise immunity.
- Separate Logic Supply Input: Allows operation at a lower voltage.
- Heatsinking: 8 center pins connected together in the SO-20 package for improved thermal management.
Applications
- DC Motor Drivers: Controls DC motors in various directions.
- Relay Drivers: Drives relays and solenoids efficiently.
- Stepper Motor Drivers: Suitable for driving stepper motors.
- Two-Phase Motor Drivers: Can be used in two-phase motor applications.
Q & A
- What is the maximum supply voltage for the L293DD?
The maximum supply voltage (VS) for the L293DD is 36 V.
- What is the output current capability per channel of the L293DD?
The L293DD has an output current capability of 600 mA per channel, with a peak output current of 1.2 A (non-repetitive) per channel.
- What is the operating temperature range of the L293DD?
The operating temperature range of the L293DD is from -40°C to 150°C.
- Does the L293DD have internal clamp diodes?
- What is the purpose of the enable facility in the L293DD?
The enable facility allows each pair of channels to be controlled as two bridges, simplifying the use of the device).
- What types of loads can the L293DD drive?
The L293DD can drive inductive loads such as relays, solenoids, DC motors, stepping motors, and switching power transistors).
- What is the maximum frequency for switching applications of the L293DD?
The L293DD is suitable for use in switching applications at frequencies up to 5 kHz).
- What package types are available for the L293DD?
The L293DD is available in a 20-lead surface mount package (SO-20)).
- Does the L293DD have overtemperature protection?
- What is the significance of the separate logic supply input in the L293DD?
The separate logic supply input allows the device to operate at a lower voltage, enhancing flexibility in system design).
