Stepping motor driver addresses automotive requirements

16th July 2020
Lanna Cooper

Toshiba Electronics has introduced the TB9120AFTG. This constant-current 2-phase bipolar stepping motor driver, which is designed for automotive use, can significantly streamline motor system implementations. It delivers a sine-wave output signal (with up to 1/32 incremental steps supported) while requiring only a simple clock input. The need for a sophisticated microcontroller unit (MCU) or dedicated software is thereby avoided.

Each of the AEC-Q100-compliant TB9120AFTG driver ICs incorporates low on-resistance DMOS FETs, and can deliver a 1.5A (maximum) current. Thanks to the large number of micro-steps they support, motor noise can be significantly reduced, with smoother operation and more precise control being benefited from.

The built-in mixed decay mode helps to stabilise the current waveforms. Numerous protection mechanisms are incorporated, these include over-current and over-temperature detection, plus thermal shutdown. There is also a stall detection function.

These devices are supplied in compact VQFN packages (with 6.0x6.0mm dimensions) featuring wettable flanks to allow the use of Automated Optical Inspection (AOI) for ensuring the quality of solder joints. They support an operational temperature range covering -40°C to 125°C.

Key applications include battery management systems, or refrigeration circuit expansion valves for air conditioning.

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