This document is a datasheet for the SANYO LB1825 motor driver IC, primarily designed for applications like polygon mirror motors and optical disk spindle motors. Here’s a breakdown of the key information:

Core Functionality:

️· Brushless DC (BLDC) Motor Driver: The LB1825 controls BLDC motors, using Hall effect sensors for position feedback.
️· PLL Servo Control: It utilizes a Phase-Locked Loop (PLL) to precisely control motor speed.
️· FG (Frequency Generator) Input: Speed information can be provided through an external FG signal or via the Hall sensors.
️· Current Limiter: Built-in current limiting protects the IC and the motor.

Key Features and Specifications:

️· Clock Modes: Supports both internal crystal oscillator and external clock input.
️· Speed Control: Achieved through PLL and FG signal.
️· Hall Sensor Inputs: Accepts signals from three Hall effect sensors.
️· Braking Control: Includes a brake command input (S/B) and offers a controlled braking scheme for applications like optical disk drives.
️· Open Collector Outputs: Features open-collector outputs for motor drive and FG/Hall FG signals.
️· Applications: Specifically aimed at polygon mirror motors and optical disk spindle motors.

Important Sections:

️· Pin Descriptions: Detailed explanations of each pin’s function.
️· Functional Block Diagram: Shows the internal architecture of the IC.
️· Sample Application Circuits: Provides examples of how to connect the IC in typical applications.
️· Usage Notes: Important guidelines for designing with the IC, including component selection, speed control methods, and braking control.
️· Clock Divisor Switching: Table that controls the PLL servo frequency depending on the clock input and divisor settings.



Overall, this datasheet provides a comprehensive guide for engineers designing motor control systems using the SANYO LB1825 IC. It includes detailed technical information, application examples, and important design considerations.