Overview
The L6474HTR, produced by STMicroelectronics, is a highly integrated stepper motor driver that leverages analog mixed-signal technology. It features a dual low RDS(on) DMOS full bridge with all power switches, equipped with accurate on-chip current sensing circuitry. This device is designed for non-dissipative current control and includes robust overcurrent protections. The L6474HTR supports up to 1/16 microstepping through an adaptive decay mode, enhancing performance over traditional implementations. It also includes a rich set of protections such as thermal, low bus voltage, and overcurrent, making it suitable for demanding motor control applications.
Key Specifications
| Parameter | Value |
|---|---|
| Operating Voltage | 8 - 45 V |
| Output Peak Current | 7.0 A (3.0 A r.m.s.) |
| Power MOSFETs | Low RDS(on) DMOS |
| Microstepping Capability | Up to 1/16 microsteps |
| Current Control | Adaptive decay mode, non-dissipative current sensing |
| Interface | SPI (5 Mbit/s) |
| Quiescent and Standby Currents | Low quiescent and standby currents |
| Overcurrent Protection | Programmable non-dissipative overcurrent protection |
| Thermal Protection | Two-level overtemperature protection |
| Package | HTSSOP28 |
| Grade | Industrial |
| RoHS Compliance | Ecopack2 |
| Operating Temperature | -40°C to 150°C |
Key Features
- Programmable power MOS slew rate, deadtime, and blanking-time
- Integrated analog to digital converter for torque regulation or user-defined applications
- Internal voltage regulator generating a 3 V voltage from the motor power supply
- SPI interface for synchronous serial communication with the host microprocessor
- Low quiescent and standby currents for power efficiency
- Programmable non-dissipative overcurrent protection on all power MOSFETs
- Two-level overtemperature protection for thermal management
- SYNC pin for synchronization signals and FLAG pin for status indication
- Reset and standby mode for power management and protection
Applications
The L6474HTR is suitable for a variety of demanding motor control applications, including:
- Industrial automation and machinery
- 3D printing and CNC machines
- Medical devices requiring precise motor control
- Aerospace and defense systems
- Automotive systems, especially those requiring high reliability and precision
Q & A
- What is the operating voltage range of the L6474HTR?
The operating voltage range is 8 - 45 V.
- What is the maximum output peak current of the L6474HTR?
The maximum output peak current is 7.0 A (3.0 A r.m.s.).
- Does the L6474HTR support microstepping?
Yes, it supports up to 1/16 microsteps.
- What type of interface does the L6474HTR use for communication?
The L6474HTR uses a 5 Mbit/s SPI interface.
- What kind of thermal protection does the L6474HTR have?
The L6474HTR features two-level overtemperature protection.
- How does the L6474HTR manage current control?
The device uses an adaptive decay mode with non-dissipative current sensing for current control.
- Can the L6474HTR be put into standby mode?
Yes, the device can be put into standby mode through the STBY/RST pin.
- What is the purpose of the SYNC pin on the L6474HTR?
The SYNC pin works as a synchronization signal, echoing one of the bits of the EL_POS register.
- How does the L6474HTR handle overcurrent conditions?
The device has programmable non-dissipative overcurrent protection, and overcurrent events can be managed through the OCD_TH register and OC_SD bit in the CONFIG register.
- What is the role of the internal voltage regulator in the L6474HTR?
The internal voltage regulator generates a 3 V voltage from the motor power supply and can be used to supply the VDD pin for digital output compatibility.
