1999 March 15

5

Philips Semiconductors

Product specification

Brushless DC motor drive circuit

TDF5140A

FUNCTIONAL DESCRIPTION

The TDF5140A offers a sensorless three phase motor drive function. It is unique in its combination of sensorless motor

drive and full-wave drive. The TDF5140A offers protected outputs capable of handling high currents and can be used

with star or delta connected motors. It can easily be adapted for different motors and applications. The TDF5140A offers

the following features:

• Sensorless commutation by using the motor EMF.

• Built-in start-up circuit.

• Optimum commutation, independent of motor type or motor loading.

• Built-in flyback diodes.

• Three phase full-wave drive.

• High output current (0.8 A).

• Outputs protected by current limiting and thermal protection of each output transistor.

• Low current consumption by adaptive base-drive.

• Accurate frequency generator (FG) by using the motor EMF.

• Amplifier for external position generator (PG) signal.

• Suitable for use with a wide tolerance, external PG sensor.

• Built-in multiplexer that combines the internal FG and external PG signals on one pin for easy use with a controlling

microprocessor.

• Uncommitted operational transconductance amplifier (OTA), with a high output current, for use as a control amplifier.

Fig.2 Pin configuration

TDF5140A

MGH311

1

2

3

4

5

6

7

8

9

MOT1

TEST

MOT2

VMOT

PG IN

PG/FG

GND2

Vp

CAP-CD

GND1

MOT0

MOT3

AMP OUT

-AMP IN

+AMP IN

CAP-TI

CAP-ST

CAP-DC

18

17

16

15

14

13

12

11

10