Overview
The L9958SB, produced by STMicroelectronics, is an SPI-controlled H-Bridge driver designed for the control of DC and stepper motors in safety-critical applications and under extreme environmental conditions. This device is particularly suited for use in automotive and other high-reliability sectors where robust motor control and comprehensive diagnostics are essential.
Key Specifications
| Parameter | Specification |
|---|---|
| Operating Battery Supply Voltage | 4.0 V to 28 V |
| Operating Vdd Supply Voltage | 4.5 V to 5.5 V |
| Pins Voltage Withstand | 19 V, Vs and output pins withstand 40 V |
| Full Path Ron | 100 mΩ (at Tj = -40 °C) to 300 mΩ (at Tj = 150 °C) |
| Logic Inputs | TTL/CMOS-compatible |
| Operating Frequency | Up to 20 kHz |
| SPI Interface | 16-bit, configuration/diagnostics, daisy chain capability |
| Current Regulation Peak Threshold | Programmable by SPI up to 8.6 A (Typ.) in 4 steps |
| Protection Features | Over temperature, short circuits, undervoltage lockout, overvoltage protection |
| Package Options | PowerSO-20, PowerSO16, PowerSSO24 |
Key Features
- Programmable current regulation peak threshold by SPI up to 8.6 A (Typ.) in 4 steps
- Operating frequency up to 20 kHz
- 16-bit SPI interface for configuration and diagnostics with daisy chain capability
- Protection against over temperature, short circuits, undervoltage, and overvoltage
- Undervoltage disable function for Vs and Vdd, and overvoltage detection for Vdd
- Open-load detection in ON condition and full diagnostics in OFF state
- Enable and disable input, low standby current (<10 μA)
- Voltage and current slew-rate control for low EMI, programmable through SPI
- Integrated free-wheel diodes with low side transistor switching to reduce power dissipation
Applications
The L9958SB is designed for use in safety-critical applications, particularly in the automotive sector. It is suitable for controlling DC and stepper motors under extreme environmental conditions. Other potential applications include industrial automation, medical devices, and any system requiring robust and reliable motor control with advanced diagnostics.
Q & A
- What is the L9958SB used for?
The L9958SB is used for the control of DC and stepper motors in safety-critical applications and under extreme environmental conditions.
- What are the operating voltage ranges for the L9958SB?
The operating battery supply voltage range is 4.0 V to 28 V, and the operating Vdd supply voltage range is 4.5 V to 5.5 V.
- What protection features does the L9958SB have?
The L9958SB has protection against over temperature, short circuits, undervoltage lockout, and overvoltage protection.
- How is current regulation managed on the L9958SB?
Current regulation peak threshold can be programmed by SPI up to 8.6 A (Typ.) in 4 steps.
- What is the significance of the SPI interface on the L9958SB?
The 16-bit SPI interface allows for configuration, diagnostics, and daisy chain capability.
- How does the L9958SB handle open-load conditions?
The device can detect open-load conditions in the ON state and provides full diagnostics in the OFF state.
- What are the package options available for the L9958SB?
The device is available in PowerSO-20, PowerSO16, and PowerSSO24 packages.
- How does the L9958SB reduce power dissipation during free-wheeling conditions?
The low side transistor is switched on in parallel with its diode to reduce power dissipation during free-wheeling conditions.
- What is the standby current of the L9958SB?
The standby current is less than 10 μA.
- Can the slew-rate be controlled on the L9958SB?
Yes, voltage and current slew-rate can be controlled for low EMI, and this is programmable through SPI.
