TDA5145 datasheet(2/24 Pages) PHILIPS

2 / 24 page

June 1994

Philips Semiconductors

Product speciﬁcation

Brushless DC motor drive circuit

TDA5145

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 2.0 A (typ.)

– built-in current limiter

– soft-switching outputs for low Electromagnetic

Interference (EMI)

• Thermal protection

• Flyback diodes

• Tacho output without extra sensor

• Motor brake facility

• Direction control input

• Reset function

• Transconductance amplifier for an external control

transistor.

APPLICATIONS

• General purpose spindle driver e.g.:

– Hard disk drive

– Tape drive

– Optical disk drive.

GENERAL DESCRIPTION

The TDA5145 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.

It includes bidirectional control, brake function and has a

special circuit built-in to reduce the EMI (soft switching

output stages).

QUICK REFERENCE DATA

Measured over full voltage and temperature range.

Notes

1. An unstabilized supply can be used.

2. VVMOT = VP; +AMP IN = −AMP IN = 0 V; all outputs IO = 0 mA.

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

supply voltage

note 1

−

VVMOT

input voltage to the output driver

stages

note 2

1.7

−

VDO

drop-out output voltage

IO = 100 mA

−

0.90

1.05

ILIM

current limiting

VVMOT = 10 V; RO = 1.2 Ω

1.8

2.0

2.5

TYPE NUMBER

PACKAGE

PINS

PIN POSITION

MATERIAL

CODE

TDA5145

DIL

plastic

SOT117-1

TDA5145T

SOL

plastic

SOT136-1

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