GENERAL DESCRIPTION
The TDA5144 is a bipolar integrated circuit used to drive 3-phase brushless DC motors in full-wave mode. The device is sensorless (saving of 3 hall-sensors) using the back-EMF sensing technique to sense the rotor position. A special circuit is built-in to reduce the EMI (soft switching output stages). It is ideally suited as a drive circuit for hard disk drive spindle motor requiring powerful output stages (current limit of 2.0 A). It can also be used in e.g. laser beam printer and other applications.

FEATURES
• Full-wave commutation (using push/pull drivers at the output stages) without position sensors
• Built-in start-up circuitry
• Three push-pull outputs:
    – output current 2.0 A (typ.)
    – low saturation voltage
    – built-in current limiter
    – soft-switching outputs for low Electromagnetic
    Interference (EMI)
• Thermal protection
• Flyback diodes
• Tacho output without extra sensor
• Transconductance amplifier for an external control transistor.

APPLICATIONS
• General purpose spindle driver (e.g. for hard disk)
• Laser beam printer.