Overview
The LB1868 is a 2-phase unipolar brushless motor driver. With only a few peripheral parts, lockup protection and automatic recovery can be implemented. The IC can be configured for 12V or 24V operation and a wide range of variations, from Low speed to H-High speed and from 60cm to 120cm square using the same PCB. This makes it easy to design highly reliable fan motor installations.

Features
● Output protection Zener diode with variable withstand voltage
   Z1, Z2 pins open: VOLM = 57V (24V specification)
   Z1, Z2 pins shorted: VOLM = 32V (12V specification)
   External Zener diode connected across Z1 - VCC pins:
      support for fans with large drive current
● External resistor allows configuration for 12V or 24V
● Direct Hall element connection possible
   (built-in Hall amplifier with hysteresis supports core without auxiliary electrode)
● Built-in output transistor with 1.0A output current
   (strengthened negative-current support for core without auxiliary
   electrode)
● Built-in rotation detection function:
   Low during rotation and High during stop
● Built-in lockup protection with automatic recovery
● Built-in thermal shutdown