DRV8425PWPR

Overview

The DRV8425PWPR is a dual H-bridge motor driver from Texas Instruments, designed for bipolar stepper motors or dual brushed DC motors. It operates within a supply voltage range of 4.5V to 35V and delivers an output current of up to 2A per bridge. The device integrates STEP/DIR interface logic, 1/256 microstepping capability, and Smart Tune technology for automatic optimization of chopper parameters. It features integrated current sense amplifiers for precise control and protection.

Feature Summary

• Integrates STEP/DIR interface logic with support for full, half, quarter, eighth, sixteenth, thirty-second, sixty-fourth, one-twelfth-eighth, and two-hundred-fifty-sixth microstepping modes.
• Includes Smart Tune technology that automatically optimizes chopper parameters such as blanking time, off-time, and hysteresis based on load conditions.
• Features integrated high-side and low-side current sense amplifiers for accurate overcurrent protection and closed-loop current control.
• Provides thermal shutdown protection and under-voltage lockout to ensure reliable operation in demanding environments.

Applications

• Bipolar stepper motor control systems
• Dual brushed DC motor drives
• Automotive interior actuation applications
• Industrial automation equipment

Procurement Notes

Verify the specific suffix 'PWPR' corresponds to the HTSSOP-48 package and tape-and-reel packaging configuration. Confirm the operating temperature grade matches system requirements. Ensure compatibility with the host controller's logic voltage levels for the STEP/DIR interface. Validate that the 2A continuous current rating aligns with the motor's peak and RMS current demands under expected thermal conditions.

Selection Notes

Select this component when precise microstepping resolution and automated tuning are required without external microstepping generators. The integrated current sense eliminates the need for external shunt resistors and amplifiers, reducing bill of materials cost. Consider the thermal performance of the HTSSOP-48 package relative to the PCB copper area and airflow conditions. Ensure the input voltage range covers the system's nominal and transient supply voltages.

Part Context

The DRV8425 belongs to Texas Instruments' DRV84xx family of advanced motor drivers. This series emphasizes ease of use through integrated intelligence like Smart Tune. The PWPR variant specifically denotes the plastic heat-sink thin quad flatpack no-lead (or similar HTSSOP) surface-mount package optimized for high-density board layouts. It complements other TI solutions by offering a balance between performance and integration level for mid-power motor applications.

Replacement Considerations

The DRV8424PWPR is a pin-compatible alternative offering similar functionality but may differ in specific current ratings or feature sets. Verify electrical specifications and thermal characteristics before substitution. Other DRV84xx family members may require schematic modifications due to pinout differences.

FAQ

Does the DRV8425PWPR support standalone step generation?

No, the DRV8425PWPR requires an external microcontroller or logic source to provide the STEP and DIR signals. It does not contain internal step generation circuitry.

What is the purpose of Smart Tune technology?

Smart Tune automatically adjusts chopper parameters including blanking time, off-time, and hysteresis to optimize motor performance and efficiency across varying load and speed conditions.

How is overcurrent protection implemented?

Overcurrent protection is achieved using integrated high-side and low-side current sense amplifiers that monitor the motor coil currents and trigger protection mechanisms if thresholds are exceeded.