GENERAL DESCRIPTION
The TDA5143T 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 as well as other applications (e.g. laser beam printer).

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 0.85 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.