June 1994

2

Philips Semiconductors

Product specification

Brushless DC motor drive circuit

TDA5143T

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.

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).

QUICK REFERENCE DATA

Measured over full voltage and temperature range.

Notes

1. An unstabilized supply can be used.

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

supply voltage

note 1

4

−

18

V

input voltage to the output

driver stages

note 2

1.7

−

16

V

drop-out output voltage

−

0.93

1.05

V

current limiting

0.7

0.85

1.0

A

TYPE NUMBER

PACKAGE

PINS

PIN POSITION

MATERIAL

CODE

TDA5143T

20

SOL

plastic

SOT163-1