Overview

The LB1924 is a direct PWM drive output driver IC appropriate for the power brushless motors used in office automation equipment. It includes a speed control circuit, an FG amplifier, and other peripheral circuits and allows a drive circuit to be implemented with a single IC. It allows the number of external components to be reduced by including a lock protection circuit, a kickback absorption diode for the lower output side, and other components on chip.

Functions

• Breakdown voltage: 30 V, output current: 3.1 A

• Direct PWM drive output

• Speed discriminator + PLL speed control technique

• Crystal oscillator circuit

• Built-in FG and integrating amplifiers

• Forward/reverse switching circuit

• Speed lock detection output

• On-chip lower output side kickback absorption diode

• Full complement of built-in protection circuits, including lock protection, current limiter, and thermal protection circuits