Stepping motor driver suitable for automotive applications
A new constant current 2-phase stepping motor driver has been launched by Toshiba Electronics Europe for automotive applications and a range of general uses, including adjusting the mirror for projection of heads-up displays, motorcycle valves and valve/damper controllers in HVAC applications.
The TB9120FTG IC provides PWM 2-phase constant current control from a simple clock signal, with no need for an advanced microcontroller (MCU) or dedicated software. Smooth, precise control and lower motor noise are guaranteed by the micro step drive that is selectable for full, half, 1/4, 1/8, 1/16 and 1/32 steps. A mixed decay mode ensures that the current flowing through the motor is stable.
The new IC operates from a single supply voltage in the range 7-18V and incorporates DMOS FETs with low on-resistance (RON) [upper + lower = 0.7Ω at 25˚C], which are capable of delivering a maximum current of 1.5A. The device is housed in a small QFN28 type package measuring 6.0x6.0mm.
The TB9120FTG incorporates a variety of error detections including stall detection, thermal shutdown, over-current detection and open load detection and provides a flag output to indicate the presence of any error, and a dedicated pin for stall detection.
The new IC has an operating temperature range of -40 to 125°C, and it will be qualified against AEC-Q100, a certified standard for electronic components for automotive applications.
Sample shipments start in November, with mass production scheduled to start in July 2019.
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