New device offers simple solution for two-phase constant-current operation

Toshiba Electronics has just launched a new constant current two-phase stepping motor driver for automotive applications and many other uses, which includes adjusting the mirror for projection of heads-up displays, motorcycle valves and valve / damper controllers in HVAC applications. The TB9120FTG IC provides PWM two-phase constant current control from a simple clock signal, with no need for an advanced MCU or dedicated software. It guarantees smooth, precise control and lower motor noise 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 makes sure that there is a stable current flowing through the motor. The new IC functions from a single supply voltage in the range 7V to 18V and includes DMOS FETs with low on-resistance (RON) [upper plus lower = 0.7Ohm at 25C], which can deliver a maximum current of 1.5A. The device is housed in a small QFN28 type package measuring just 6mm x 6mm.