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.