Overview

The LB11681H is a three-phase brushless fan motor driver IC. This IC uses a PWM soft switching drive-method (for low-noise drive). Since this IC includes a motor constraint protection circuit necessary for a fan motor system, highly reliable products including this IC can be designed. Also, this IC can be operated with 12V single power supply.

Functions

• Direct PWM drive

• Three-phase full-wave driving method

• Soft switching driving

• Built-in lock (constraint) protection circuit

• Built-in lock (constraint) detection circuit

• FG output (provides one Hall effect sensor equivalent FG outputs)

• Built-in Forward / Reverse switching circuit

• Built-in thermal shut down circuit

• Built-in current limitation circuit