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TI unveils integrated stepper motor pre-driver

Posted: 16 Sep 2013 ?? ?Print Version ?Bookmark and Share

Keywords:stepper motor pre-driver? office automation? textile machinery?

Texas Instruments (TI) has announced its first integrated stepper motor pre-driver as the latest addition to its motor driver portfolio. According to the company, the DRV8711 is highly configurable with a best-in-class on-chip micro-stepping indexer, as well as stall detection, and advanced current regulation that easily and efficiently tunes any motor.

External MOSFETs control the stepper motor to provide minimum heat dissipation and 20 per cent more scalable output current than the nearest competitor allowing designers to customise their design, touted the firm. The stepper motor pre-driver is designed for industrial applications, including textile machinery, video surveillance, ATMs, robotics, office automation equipment and stage lighting.

The DRV8711 has a gate drive that supports up to 200mA of source current per 400mA 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 device also spins 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 optimise motor performance, added TI.

Designers can easily 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 minimise a disturbance from a motor stall. Additionally, 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. Likewise, 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 MCU and external NexFET power MOSFETs. The EVM provides up to 52V externally through the power header and a USB interface to communicate with the MSP430F2617 MCU through a graphical user interface. A stepper motor is also included to evaluate controller performance.

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

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