Overview

The LB1821M is a pre-driver IC that supports direct PWM drive and is appropriate for the power brushless motors used in office automation equipment. A motor drive circuit with the desired output capability (voltage and current characteristics) can be constructed by attaching a driver array at the IC output. The LB1821M includes on chip a speed control circuit that allows the motor speed to be varied using an external clock.

Features

• Direct PWM drive output

• Speed discriminator + PLL speed control circuit

• FG and integrating amplifiers

• Forward/reverse switching circuit

• Braking circuit (short braking)

• Speed lock detection output

• Full complement of on-chip protection circuits, including lock protection, current limiter, and thermal shutdown protection circuits.