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