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