GENERAL DESCRIPTION
The TDF5242T is a bipolar integrated circuit for driving 3-phase brushless DC motors in full-wave mode. The device functions sensorless, thus saving 3 hall-effect sensors, using the back-EMF (Electro Motive Force) sensing technique to sense the rotor position. It includes 6 pre-drivers able to control external FETs (Field Effect Transistors) or bipolar transistors. It offers brake and direction control. It is ideally suited for high-power applications such as high-end hard disk drives and automotive applications.

FEATURES
• Full-wave commutation without position sensors
• Built-in start-up circuitry
• Six outputs that can drive three external transistor pairs:
   – output current 0.2 A (typ.)
   – low saturation voltage
   – built-in current limiter
• Thermal protection
• Tacho output without extra sensor
• Transconductance amplifier for an external control transistor
• Brake control input
• Direction control input.

APPLICATIONS
• High-power applications, for instance:
   – high-end hard disk drives
   – automotive applications.