Overview
The L297D Stepper Motor Controller IC, produced by STMicroelectronics, is designed for microcomputer-controlled applications. It generates four-phase drive signals for both two-phase bipolar and four-phase unipolar stepper motors. The L297D supports various drive modes, including half-step, normal, and wave drive modes. It features on-chip PWM chopper circuits that enable switch-mode control of the current in the motor windings, reducing the burden on the microprocessor and programmer. Available in DIP20 and SO20 packages, the L297D can be used with monolithic bridge drives like the L298N or L293E, or with discrete transistors and Darlington arrays.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (Vs) | 4.75 - 7 | V |
| Quiescent Supply Current (Is) | 50 - 80 | mA |
| Input Voltage (Vi) | 0.6 - 2 Vs | V |
| Input Current (Ii) | 100 µA (Low), 10 µA (High) | µA |
| Enable Input Voltage (Ven) | 1.3 - 2 Vs | V |
| Enable Input Current (Ien) | 100 µA (Low), 10 µA (High) | µA |
| Phase Output Voltage (Vo) | 0.4 V (Low), 3.9 V (High) | V |
| Inhibit Output Voltage (Vinh) | 0.4 V (Low), 3.9 V (High) | V |
| Operating Temperature | -40 to +150 | °C |
| Storage and Junction Temperature | -40 to +150 | °C |
| Total Power Dissipation (Tamb = 70°C) | 1 | W |
| Thermal Resistance Junction-Ambient (Rth-j-amb) | 80 (DIP20), 100 (SO20) | °C/W |
Key Features
- Generates four-phase drive signals for two-phase bipolar and four-phase unipolar stepper motors.
- Supports half-step, normal, and wave drive modes.
- On-chip PWM chopper circuits for switch-mode control of current in motor windings.
- Requires only clock, direction, and mode input signals, reducing microprocessor burden.
- Available in DIP20 and SO20 packages.
- Can be used with monolithic bridge drives (e.g., L298N, L293E) or discrete transistors and Darlington arrays.
- Features include SYNC output for oscillator synchronization, HOME output for initial state indication, and ENABLE input for chip control.
- Programmable load current via Vref input and RC network for chopper rate adjustment.
Applications
- Microcomputer-controlled stepper motor systems.
- Bipolar and unipolar stepper motor drives.
- Industrial automation and robotics.
- Medical equipment and precision machinery.
- Printers, plotters, and other precision positioning systems.
Q & A
- What types of stepper motors can the L297D control?
The L297D can control both two-phase bipolar and four-phase unipolar stepper motors.
- What drive modes does the L297D support?
The L297D supports half-step, normal, and wave drive modes.
- How does the L297D regulate the current in the motor windings?
The L297D uses on-chip PWM chopper circuits for switch-mode control of the current in the motor windings.
- What are the key input signals required for the L297D?
The key input signals include clock, direction, and mode inputs.
- What packages is the L297D available in?
The L297D is available in DIP20 and SO20 packages.
- Can the L297D be synchronized with other L297 devices?
- How is the load current programmed in the L297D?
The load current is programmed via a voltage divider on the Vref input.
- What is the operating temperature range of the L297D?
The operating temperature range is -40°C to +150°C.
- Is the L297D RoHS compliant?
- What are some common applications of the L297D?
