The LB11946 is a two-channel BTL driver for CD-ROM spindle motors and tray motors manufactured by SANYO Semiconductor. This integrated circuit is designed to provide efficient and reliable motor control for optical disc drives. Its primary function is to drive the spindle motor, which spins the CD-ROM, and the tray motor, which controls the loading and unloading of the disc.

Applications

• CD-ROM Drives: Driving the spindle and tray motors in computer CD-ROM drives.
• DVD-ROM Drives: Driving the spindle and tray motors in DVD-ROM drives.
• Optical Disc Players: Spindle and tray motor control in CD and DVD players.
• Other Motor Control Applications: Suitable for other applications requiring two-channel BTL drivers.

Features

• Two-Channel BTL Driver: Provides two independent bridge-tied load (BTL) drivers for motor control.
• Built-In Protection Circuits: Includes overcurrent protection (OCP) and thermal shutdown (TSD) to protect the IC and the motor.
• Low Saturation Voltage: Minimizes power dissipation and improves efficiency.
• Direct PWM Control: Allows for direct PWM (Pulse Width Modulation) control of the motor speed.
• Brake Function: Includes a brake function for rapid motor deceleration.
• Built-In Hall Amplifier: Integrated hall amplifier for spindle motor feedback control.
• Compact Package: Available in a compact package for space-constrained applications.

Benefits

• Efficient Motor Control: The BTL driver configuration provides efficient power transfer to the motor.
• Reliable Operation: Built-in protection circuits ensure reliable operation under various conditions.
• Simplified Design: Integrated features reduce the number of external components required.
• Precise Speed Control: Direct PWM control allows for precise adjustment of the motor speed.
• Reduced Power Dissipation: Low saturation voltage minimizes power loss and improves efficiency.

Additional Details

The LB11946 incorporates two independent BTL driver channels, each capable of delivering current to drive a DC motor. The BTL configuration improves efficiency compared to single-ended drivers. The integrated overcurrent protection (OCP) prevents damage to the IC and the motor in case of excessive current draw. The thermal shutdown (TSD) feature shuts down the IC when the temperature exceeds a safe limit, protecting it from overheating. The integrated hall amplifier is designed to receive the feedback signal from a hall sensor in the spindle motor, enabling closed-loop speed control. SANYO Semiconductor provides detailed datasheets with example circuits and application guidelines for the LB11946.