Overview

The LB1921 is a single-chip motor driver circuit that provides direct PWM drive output appropriate for driving the power brushless motors used in office automation equipment. The LB1921 also provides a variety of peripheral functions, including speed control and FG amplifier circuits, on chip.

Functions and Features

• The LB1921 is an improved output current version of the LB1824.

• Three-phase bipolar brushless motor driver

• Digital speed control circuit

• Thermal shutdown circuit

• Start/stop pin

• Lock detector output

• Crystal oscillator and divider circuits

• FG and error amplifiers

• Power supply current limiter

Applications

• Paper feed and drum motor drivers in FAX and PPC units