The LB11873 is a 3-phase brushless DC motor driver manufactured by SANYO Semiconductor. It's designed to efficiently and quietly drive cooling fans in various electronic devices. The IC integrates Hall sensors for motor speed control and features built-in protection circuits for reliable operation.

Applications

• Cooling fans in PCs
• Cooling fans in servers
• Cooling fans in projectors
• Cooling fans in power supplies
• Any application requiring quiet and efficient cooling fan operation

Features

• 3-phase brushless DC motor driver
• Integrated Hall sensors
• Built-in locked rotor protection
• Built-in thermal shutdown protection
• Soft switching for low noise
• Speed control via PWM or DC voltage

Benefits

• Efficient and quiet motor driving
• Precise speed control
• Protection against motor stalling and overheating
• Reduced acoustic noise
• Simplified circuit design with integrated functions
• Improved system reliability

Additional Details

The LB11873 incorporates Hall sensors for accurate rotor position detection, enabling precise motor speed control and efficient commutation. The built-in locked rotor protection circuit prevents damage to the motor and driver in the event of a motor stall. The thermal shutdown protection circuit protects the IC from overheating. The soft switching technique minimizes electromagnetic interference (EMI) and reduces acoustic noise. The motor speed can be controlled via pulse-width modulation (PWM) or DC voltage.

For detailed electrical characteristics, timing diagrams, and pin configurations, refer to the LB11873 datasheet provided by SANYO Semiconductor.