Chip Runs Two Stepper Motors Independently

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Toshiba introduced an efficient bipolar stepper motor driver chip which can run two stepping motors independently. The chip also has an ability to drive both stepper motors and brushed DC motors, and has applications in printers, surveillance cameras, office-automation equipment, banking terminals (including ATMs and banknote identification machines) and home appliances.

“The TC78S122FNG is a high-speed multi-stepper or brushed DC motor controllable driver with maximum ratings of 40V and 2.0A and a two-channel drive function. With a growing trend towards miniaturization, the product also meets the growing needs of reducing both heat generated within equipment and overall power consumed per unit”, says the company.

Deepak Mithani, senior director, Mixed-Signal Business Unit, System LSI Group at TAEC, noted, “The heat generated by the ICs themselves prevented previous products from achieving continuous operation in the driving current range of 1.5A motors used in a wide range of equipment. Our new product can simultaneously drive two channels by cutting output resistance in half, which, in turn, significantly reduces heat generation.”

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With ability to drive both stepping and brushed DC motors, the product allows the use of stepping motors and brushed DC motors together in six combinations. These include two 1.5A stepping motors, one 1.5A stepping motor with two 2.0A brushed DC motors, or four 2.0A brushed DC motors. Further, the channels can also be paralleled to double the power handling. In that case, the chip can be used to drive one 3.0A stepping motor or two 4.0A brushed DC motors.

The motor driver offers single-, half-, or quarter-step stepper motor driving for various torque-speed tradeoffs flexibility. A built-in sleep function saves power by stopping the regulator circuit for the IC’s internal logic, making it to consume microamps in standby mode. Thermal and overcurrent shutdown circuits enhance equipment safety and reliability.

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The chip is offered in a space-saving HTSSOP package which leads to reduced costs. A high-thermal-conductivity of the HTSSOP package simplifies thermal management of the equipment and the module. Toshiba plans to develop an even more compact QFN package for the solution later this year.

Samples of the TC78S122FNG stepping motor driver are available. Mass production is scheduled to begin in July 2016.

For further details, view the full Press release.

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