Overview
The DRV8434S, produced by Texas Instruments, is a highly integrated bipolar stepper motor driver designed for both 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 range of supply voltages from 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, sensorless stall detection, and low EMI spread spectrum clocking, making it a robust solution for various motor control needs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply Voltage (VM) | 4.5 | - | 48 | V |
| Full-Scale Output Current | - | - | 2.5 | A |
| RMS Output Current | - | - | 1.8 | A |
| Microstepping Resolution | - | - | 1/256 | - |
| Logic Input Voltage | 1.8 | - | 5.0 | V |
| Operating Temperature | -40 | - | 150 | °C |
| Sleep Mode Current | - | - | 2 μA | - |
| PWM Off-Time Options | 7 μs | - | 32 μs | - |
Key Features
- PWM Microstepping Stepper Motor Driver: Supports up to 1/256 microstepping resolution.
- Integrated Current Sense: No external sense resistors required, with ±4% full-scale current accuracy.
- Smart Tune Technology: Automatically adjusts for optimal current regulation and reduces audible noise.
- SPI Interface: With STEP/DIR pins for external controller management and daisy chain support for up to 63 devices.
- Protection Features: Includes undervoltage lockout, overcurrent protection, sensorless stall detection, open load detection, overtemperature warning, and thermal shutdown.
- Low RDS(ON): 330 mΩ HS + LS at 24 V, 25°C.
- Low-Current Sleep Mode: 2 μA standby current.
- Spread Spectrum Clocking: For low EMI.
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 maximum output current of the DRV8434S?
The DRV8434S can drive up to 2.5 A full-scale output current and 1.8 A RMS current per bridge.
- What is the microstepping resolution of the DRV8434S?
The DRV8434S supports microstepping resolutions up to 1/256.
- What are the protection features of the DRV8434S?
The device includes undervoltage lockout, overcurrent protection, sensorless stall detection, open load detection, overtemperature warning, and thermal shutdown.
- How does the smart tune technology work in the DRV8434S?
The smart tune technology automatically adjusts for optimal current regulation and reduces audible noise from the motor by using variable off-time and dynamic fast decay schemes.
- What is the operating supply voltage range of the DRV8434S?
The DRV8434S operates within a supply voltage range of 4.5 to 48 V.
- Does the DRV8434S support daisy chaining?
Yes, the DRV8434S supports daisy chaining for up to 63 devices using its SPI interface.
- What is the sleep mode current of the DRV8434S?
The sleep mode current of the DRV8434S is 2 μA.
- How does the DRV8434S reduce EMI?
The DRV8434S uses spread spectrum clocking to minimize radiated emissions and reduce EMI.
- What are the typical applications of the DRV8434S?
The DRV8434S is used in printers, scanners, ATM machines, textile machines, stage lighting, office and home automation, factory automation, robotics, medical applications, and 3D printers.
- How does the DRV8434S handle fault conditions?
Fault conditions are indicated by the nFAULT pin, which is an open-drain output requiring an external pullup resistor.
