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Latest-generation stepper-motor controller from Toshiba Electronics Europe

Toshiba Electronics Europe has started sampling a 40V/3.0A stepper-motor control IC that requires no external current-sense resistors, making it possible to develop both more economical and compact drives for equipment such as printers, surveillance cameras and home appliances.

Additional features have increased efficiency, reduced heat generation and enhanced accuracy at high speeds.

Toshiba’s Advanced Current Detection System (ACDS) has been integrated into the new 5mm x 5mm TB67S508FTG stepper-motor controller and performs on-chip current sensing saving on component costs and about 66% of the board real-estate used by a typical 7mm x 7mm control IC with external resistors. The ACDS also eliminates the effects of resistor-tolerance errors, ensuring greater accuracy (+/-5%) and uniformity.

In addition, the built-in power stage leverages the latest DMOS technology to boost energy efficiency, which aids space-saving design and eases thermal management by reducing internal heat generation. The transistors of the output bridge have very low on-resistance (RDS(ON)) of 0.45Ω (typical, high-side + low-side).

The Advanced Dynamic Mixed Decay (ADMD) mode, which controls current more closely than conventional mixed-decay modes, ensures smooth and quiet movement over a wider speed range by maintaining accurate step control up to high speeds.

The TB67S508FTG for 2-phase bipolar stepper-motor applications supports full-, half- and quarter-step resolution modes, and is delivered in a space-saving QFN36 package optimised for high heat-radiation to allow superior reliability. All the usual protection features are built-in, including thermal shutdown, over current detection, low-power and under-voltage detection, and terminal-component open/short-circuit detection (OSCM).

Neil Tyler

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