Overview

The LB1668 Series are 2-phase unipolar drive brushless motor drivers that feature a wide usable voltage range and a minimal number of required external components. They also support the formation of motor lock protection and automatic recovery circuits.

Functions and Features

• Output protection Zener diodes with variable breakdown

voltages

— When the Z1 and Z2 pins are open: VOLM = 57 V

— When the Z1 and Z2 pins are shorted: VOLM = 32 V

— An external Zener diode can be connected between

Z1 and VCC.

• Can support both 12-V and 24-V power supplies by

changing an external resistor.

• Hall elements can be connected directly.

• 1.5-A output current output transistors built in

• Built-in rotation detection function that outputs low

when driven and high when stopped (LB1668/M)

• FG signal function that sets FG high when IN- is low,

and sets FG low when IN- is high (LB1667/M)

• Motor lock protection and automatic recovery functions

built in

• Thermal shutdown function