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).