TI launches integrated stepper motor pre-driver - Embedded.com

TI launches integrated stepper motor pre-driver

The DRV8711 from Texas Instruments (TI) is a highly configurable integrated stepper motor pre-driver with a best-in-class on-chip micro-stepping indexer. It includes stall detection and advanced current regulation. External MOSFETs control the stepper motor to provide minimum heat dissipation and 20-percent more scalable output current than the nearest competitor. The stepper motor pre-driver is designed for industrial applications, including textile machinery, video surveillance, ATM machines, robotics, office automation equipment and stage lighting. For more information or to place an order, visit .

Gate drive supports up to 200 mA of source current per 400 mA of sink current with adjustable slew rate, dead-time and on-time to accommodate application requirements. The device drives external N-channel MOSFETs with a built-in charge pump to provide more design options and a cost-effective solution. The DRV8711spins a stepper motor with an integrated micro-stepping indexer capable of up to 1/256 micro-stepping. Adaptive blanking time and various current decay modes, including slow, fast, mixed and auto-mixed decay, achieve a smooth profile to optimize motor performance.

Designers can detect stall conditions through internal stall detection, or process the optional back electromotive force (BEMF) output to detect stall conditions and take corrective action through the external controller. This allows the designer to minimize a disturbance from a motor stall. The SPI interface allows the customer to program the output current, micro-stepping mode, current decay mode and stall detection to reduce system complexity and simplify design compared to similar devices.

The DRV8711's protection against motor over-current, pre-driver over-current, over temperature and under voltage fault conditions provides system protection, and enables system reliability and system robustness.

The DRV8711EVM is available to evaluate the motor pre-driver. This evaluation module (EVM) includes a low-power MSP430F2617 microcontroller (MCU) and external NexFET™ power MOSFETs. The EVM provides up to 52-V externally through the power header and a USB interface to communicate with the MSP430F2617 MCU through a graphical user interface (GUI). A stepper motor is also included to evaluate controller performance.

The DRV8711 is available now in a 38-pin HTSSOP PowerPadTM package with thermal pad for a suggested retail price of US$2.75 in 1,000-unit quantities.

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