Toshiba releases DC brushed motor IC with current limit detection to enable motor solutions that are smaller, more efficient and have reduced BOM costs.
Toshiba has launched an integrated dual H-bridge DC brushed motor driver IC that includes an output current limit function rated at 50V / 3.0A. The new TB67H401FTG device is suited to any application where monitoring and feedback of the motor state is necessary, including office equipment, ATMs, home appliances, robotic cleaners and more. All of these devices incorporating DC brushed motors have grown rapidly in popularity in recent years.
DC brushed motor IC with current limit detection
Until now the safe control of DC brushed motors has been accomplished by limiting the upper value of the motor current through a constant current limit. The overcurrent is generated by the motor lock and is read from an external resistor through external circuitry that consists of operational amplifiers and comparators, thereby increasing the component count and circuit complexity, Toshiba noted.
The new highly integrated TB67H401FTG has an inbuilt flag output circuit, which monitors the current state and indicates that the current has reached the upper threshold.
“As this function is now included, the external circuitry is no longer required and motor solutions are smaller, more efficient and have reduced BOM costs”, the company said.
1. Flag output function: A flag output function outputs results from the current limiter detection to an external device. It helps reduce the number of external amplifiers and comparators.
2. Mode switching function (single-bridge and dual-bridge modes): Single-bridge mode supports high load drives (large current drive of 6.0 A). Dual-bridge mode supports driving of two motors with a single IC (3.0 A / 2 channels). It widens the range of applications.
3. Other error detections: Thermal shutdown detection, overcurrent protection, and under voltage lockout. The error detection signal can be output to the external device, helping to enhance safety.
Applications that need to monitor and feedback results on the motor drive state—industrial equipment, including office equipment and ATMs, home appliances, and robotic cleaners.
The tiny device is housed in a 7mm x 7mm x 0.9mm QFN48 package. It is ready for mass production.
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