TOKYO–Toshiba Corporation's (TOKYO: 6502) Storage & Electronic Devices Solutions Company today announced the launch of "TB67S289FTG," a stepping motor driver with a Toshiba developed architecture that automatically detects and prevents stalling during operation. Mass production is scheduled to begin in the end of July 2017.

Stable and highly precise control is a basic operating requirement, for motors used in printers, office appliances, banking terminals such as ATMs, cash dispensers, amusement machines, and home appliances. Recent demand has also emphasized more efficient motor drivers that use less power and generate less heat generation.

Avoiding stalls in stepping motor operation is the highest priority for securing stability and precision in motor control, and is achieved by provision of additional current to assure an operating margin for the motor. Real-time monitoring of motor torque and current feedback, using additional sensors and highly advanced MCU control, are also required to improve efficiency and heat generation.

A further way to improve efficiency and cut down heat generation is to adjust the built-in MOSFET's on-resistance and cut down power loss during operation.

The TB67S289FTG is the first stepping motor driver to apply Toshiba’s original anti-stall and efficiency improvement system, Active Gain Control (AGC)[1], which enables the driver to monitor the motor and torque, and automatically optimizes motor control without additional MCU control. In operation, TB67S289FTG prevents motor stalls and automatically optimizes motor current, depending on torque needed. Compared with current solutions, TB67S289FTG cuts down the motor power by up to 80% at best, winning significant improvements in efficiency and heat improvement without relying on on-resistance.

Further efficiencies can also be achieved when the new stepping motor driver is supported by ACDS[2], Toshiba’s sense-resistor-free current monitor and control system, which allows more free space and uses fewer external components on the PCB.

Toshiba positions the TB67S289FTG as its flag-ship stepping motor driver, a high performance motor control and component reduction solution, and will continue to expand its line-up.

Main Features

>1. Anti-stall and high efficiency

Toshiba’s new motor control architecture AGC for anti-stall and high efficiency motor control. Plus sense-resistor-less current control ACDS for additional PCB space. High-resolution 1/32 step (max.) motor control cuts down noise and vibration.

>2. Lower heat generation

Heat generation is reduced by low on-resistance (0.46 Ω (upper + lower: typ.)).

>3. Small package

Packaging in a small QFN package allows customers to reduce heat problems and simplify PCB design patterns for heat dissipation. It will also realize affordable solutions in terms of space and cost.

>4. Built-in error detection circuits

Thermal shutdown, over-current shutdown, under voltage lock-out and motor load open detection circuits contribute to equipment safety and reliability. Also, error status can be flagged to MCU using error flag function.

Main Specifications of New Product

Product name	TB67S289FTG
Control I/F	CLK-IN
Absolute maximum ratings	50V, 3A
Package	QFN48
Step resolution	Full, Half, Quarter, 1/8, 1/16, and 1/32 step resolution
Other features	AGC; a current control method for anti-stall and high efficient motor operation ACDS; a current control method which does not require sense resistor Built-in error detection functions (thermal shutdown, over-current shutdown, under voltage lock out, and motor load open detection) Built-in error detection signal output function Supports the power-on sequence by the single power drive
Mass production	End of July, 2017 (scheduled)

[1] AGC: Active Gain Control. Motor control architecture that optimizes motor current to torque while preventing motor stalls.

[2] ACDS: Advanced Current Detection System. A motor control architecture that does not require an external sensing resistor to monitor the motor current.

Note: Motor stall: When motor rotation deviates from the control signal, stalling occurs and the motor stops rotating.

Source：http://www.semicon.toshiba.co.jp/eng/