Overview
The DRV8434SRGER, produced by Texas Instruments, is a highly integrated bipolar stepper motor driver designed for industrial and consumer applications. This device features two N-channel power MOSFET H-bridge drivers, an integrated current sense architecture, and a microstepping indexer. It supports a wide operating supply voltage range of 4.5 to 48 V and can drive up to 2.5 A full-scale output current. The DRV8434S is known for its advanced features such as smart tune decay modes, stall detection, and low EMI spread spectrum clocking, making it suitable for a variety of applications requiring precise motor control.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Supply Voltage (VM) | 4.5 | 48 | V | |
| Full-Scale Output Current | 2.5 | A | ||
| RMS Output Current | 1.8 | A | ||
| Peak Output Current | 4 | A | ||
| RDS(ON) (HS + LS at 24 V, 25°C) | 330 | mΩ | ||
| Microstepping Resolution | Full step to 1/256 | |||
| Logic Input Voltage | 1.8 | 3.3 | 5.0 | V |
| Sleep Mode Current | 2 | 4 | μA | |
| PWM Off-Time Options | 7 | 16 | 24, 32 | μs |
Key Features
- PWM Microstepping Stepper Motor Driver: Supports up to 1/256 microstepping resolution.
- Integrated Current Sense Functionality: No external sense resistors required, with ±4% full-scale current accuracy.
- Smart Tune Technology: Automatically adjusts for optimal current regulation and reduces audible noise from the motor.
- SPI Interface with STEP/DIR Pins: Allows an external controller to manage the direction and step rate of the stepper motor.
- Protection Features: Includes VM undervoltage lockout, charge pump undervoltage, overcurrent protection, sensorless stall detection, open load detection, overtemperature warning, thermal shutdown, and fault condition output.
- Low-Current Sleep Mode: Consumes only 2 μA in sleep mode.
- Spread Spectrum Clocking: Reduces EMI.
- Torque DAC: Allows scaling the output current through SPI without needing to scale the VREF reference.
- Daisy Chain Support: Supports up to 63 devices connected in series for configurability and detailed fault reporting.
Applications
- Printers and Scanners
- ATM and Money Handling Machines
- Textile Machines
- Stage Lighting Equipment
- Office and Home Automation
- Factory Automation and Robotics
- Medical Applications
- 3D Printers
Q & A
- What is the operating supply voltage range of the DRV8434SRGER?
The operating supply voltage range is from 4.5 V to 48 V.
- What is the maximum full-scale output current of the DRV8434SRGER?
The maximum full-scale output current is 2.5 A.
- What microstepping resolutions does the DRV8434SRGER support?
The device supports microstepping resolutions from full step to 1/256.
- What are the PWM off-time options available on the DRV8434SRGER?
The PWM off-time options are 7 μs, 16 μs, 24 μs, and 32 μs.
- Does the DRV8434SRGER have integrated current sense functionality?
- What is the purpose of the Smart Tune Technology in the DRV8434SRGER?
The Smart Tune Technology automatically adjusts for optimal current regulation and reduces audible noise from the motor.
- How does the DRV8434SRGER handle fault conditions?
Fault conditions are indicated by the nFAULT pin, and the device includes various protection features such as overcurrent protection, stall detection, and thermal shutdown.
- Can the DRV8434SRGER be used in low-power applications?
- What is the significance of the Torque DAC feature in the DRV8434SRGER?
The Torque DAC feature allows the controller to scale the output current through SPI without needing to scale the VREF reference.
- How many devices can be daisy-chained with the DRV8434SRGER?
