Toshiba launches new high-resolution micro-stepping motor driver IC with integrated current sensing

Toshiba launches new high-resolution micro-stepping motor driver IC with integrated current sensing

1706
Views
0 Comments

Toshiba Electronics Europe GmbH has launched an additional device to its line-up of micro-stepping motor driver ICs. The new TC78H670FTG is a dual channel high resolution micro-stepping motor driver IC that is capable of driving motors with a wide range of operating voltages. The new device is intended for a broad variety of consumer applications including 3D printers, cameras, security cameras, portable printers, handheld scanners, pico-projectors and battery powered medical devices.

The IC can drive a micro-stepping motor of up to 128 steps and with a voltage ranging from 2.5 V to 16 V at currents of up to 2 A. The output on-resistance (RDS(ON)) is only 0.48Ω as the TC78H670FTG uses Toshiba’s latest CDMOS process, thereby reducing voltage loss and heat generation inside the driver.  An ultra-low standby current of just 0.1 µA prolongs battery life and the ability to operate with a 1.8 V to 5.0 V interface allows connection to a wide variety of hosts and microcontrollers. As a result, the device is suited for use in USB powered and battery powered applications as well as with standard 9-12V system devices.

Summary of Features

  • Built-in Dual H Bridges, Capable of controlling 1 bipolar stepping motor
  • PWM controlled constant-current drive
  • Power supply operating voltage: 2.5V to 16.0V
  • Output current ratings: 2.0A (max)
  • Low on-resistance (High + Low side = 0.48Ω (typ.)) MOSFET output stage
  • Allows full, half, quarter, 1/8, 1/16, 1/32, 1/64, 1/128 step operation
  • Built-in Sense resistor less current control architecture (Advanced Current Detection System)
  • Multi error detect functions (Thermal shutdown (TSD), Over current (ISD), motor load open (OPD) and Under voltage lockout (UVLO))
  • Error detection (TSD/ISD/OPD) flag output function
  • Built-in VCC regulator for internal circuit
  • Chopping frequency of a motor can be adjusted by external resistor
  • Small QFN package with thermal pad (16-pin)
  • Ultra-low standby current of 0.1mA
  • Operates motors smoothly and quietly and reduces vibration; improved rotation angle accuracy achieved by micro-stepping control.

Internal Diagram

The micro-stepping control allows motors to be operated smoothly and quietly with reduced vibration and improved rotation angle accuracy. Safety features such as over current detection, thermal shut down and open-load detection are incorporated. The sophisticated motor driver is housed in a compact QFN16 package with a footprint of just 3 mm x 3 mm which, along with the elimination of the two bulky and expensive current sense resistors by incorporating on-chip current detection, contributes to significant cost and space saving in designs.

more information: toshiba.semicon-storage.com

Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

view all posts by admin

Leave a Reply

Archives