Overview
The L9935 is a two-phase stepper motor driver circuit designed by STMicroelectronics to drive bipolar stepper motors. This device is controlled via a serial interface (SPI) and integrates all necessary protections for a well-protected system, including short-circuit, over-temperature, and cross-conduction protections.
Key Specifications
| Parameter | Specification |
|---|---|
| Output Configuration | Half Bridge (4) |
| Output Current | 1.1 A per full bridge output |
| Supply Voltage | 8 V to 24 V |
| Load Voltage | 8 V to 24 V |
| Operating Temperature | -40°C to 150°C (TJ) |
| Interface | SPI |
| Step Resolution | 1, 1/2 |
| Package | PowerSO-20 |
| Mounting Type | Surface Mount |
| Standby Consumption | Typically 40 μA |
Key Features
- 2 x 1.1 A full bridge outputs
- Integrated chopping current regulation
- Minimized power dissipation during flyback
- Output stages with controlled output voltage slopes to reduce electromagnetic radiation
- Short-circuit protection of all outputs
- Error-flag for over load, open load, and over temperature pre-alarm
- Delayed channel switch on to reduce peak currents
Applications
The L9935 is suitable for general-purpose applications involving bipolar stepper motors. It is particularly useful in systems requiring precise motor control, such as in industrial automation, medical devices, and other precision machinery.
Q & A
- What type of motors does the L9935 drive?
The L9935 is designed to drive bipolar stepper motors. - How is the L9935 controlled?
The L9935 can be controlled via a serial interface (SPI). - What are the key protections integrated into the L9935?
The device includes protections against short-circuit, over-temperature, and cross-conduction. - What is the maximum operating supply voltage for the L9935?
The maximum operating supply voltage is 24 V. - What is the standby consumption of the L9935?
The standby consumption is typically 40 μA. - What is the output current capability of the L9935?
The device has 2 x 1.1 A full bridge outputs. - What is the operating temperature range of the L9935?
The operating temperature range is -40°C to 150°C (TJ). - What package type is the L9935 available in?
The L9935 is available in a PowerSO-20 package. - Does the L9935 have any features to reduce electromagnetic radiation?
Yes, the output stages have controlled output voltage slopes to reduce electromagnetic radiation. - How does the L9935 handle peak currents during channel switching?
The device has a delayed channel switch-on feature to reduce peak currents.
