Toshiba releases DC brushed motor IC with current limit detection
An integrated dual H-bridge DC brushed motor driver IC that includes an output current limit function rated at 50V / 3.0A is now available from Toshiba Electronics Europe.
Toshiba says 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 these devices usually incorporate DC brushed motors. 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.
The TB67H401FTG uses Toshiba’s BiCD process and 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.
The TB67H401FTG supports four drive modes; forward (CW), reverse (CCW), brake (short brake) and stop (off). The new driver IC also includes a mode switching function that extends the range of possible applications. The single-bridge mode supports a single channel current up to 6.0A and a dual-bridge mode allows the use of two motors with a single IC driving up to 3.0A per motor.
The low on-resistance MOSFETs incorporated into the H-bridge (high side + low side =0.49-Ohm typ.) help ensure low losses and efficient operation. An internal 5V regulator means the device can be driven from a single power supply.
The tiny device is housed in a 7mm x 7mm x 0.9mm QFN48 package and also includes thermal shutdown detection, over current protection and under voltage lockout.
A general error detection signal enhances system safety by providing a warning to the main system controller.
The TB67H401FTG is ready for mass production.
https://toshiba.semicon-storage.com
