GENERAL DESCRIPTION
The TDF5140A 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.

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

APPLICATIONS
• VCR
• Laser beam printer
• Fax machine
• Blower
• Automotive.