TDF5242 datasheet(2/20 Pages) PHILIPS

2 / 20 page

1997 Sep 12

Philips Semiconductors

Preliminary speciﬁcation

Brushless DC motor drive circuit

TDF5242T

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.

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.

QUICK REFERENCE DATA

Measured over full voltage and temperature range.

Note

1. An unstabilized supply can be used.

ORDERING INFORMATION

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT

supply voltage

note 1

−

VVMOT

input voltage to the output

driver stages

−

driver output voltage

IO = 100 mA; lower transistor

−−

0.35

IO = 100 mA; upper transistor

1.05

−−

ILIM

current limiting

VVMOT = 14.5 V; RO =47 Ω

150

200

250

TYPE

NUMBER

PACKAGE

NUMBER

DESCRIPTION

VERSION

TDF5242T

SO28

plastic small outline package; 28 leads; body width 7.5 mm

SOT136-1

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