Toshiba: stepper-motor controller saves space and ensures cooler, quieter running

Toshiba Electronics Europe has begun sampling a new 40V/3.0A stepper-motor control IC that requires no external current-sense resistors, and hence enables more economical and compact drives in equipment such as printers, office machines, surveillance cameras, banking terminals, banknote identification machines, and home appliances. Further new features increase efficiency, reduce heat generation, and enhance accuracy at high speeds.

Toshiba’s Advanced Current Detection System, integrated in the new 5 x 5mm TB67S508FTG stepper-motor controller, performs on-chip current sensing thereby saving component costs and about 66% of the board real-estate used by a typical 7x 7mm control IC with external resistors. 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). Moreover, Toshiba’s Advanced Dynamic Mixed Decay 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.

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