TDF5242 データシートの表示（PDF） - Philips Electronics

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TDF5242

Brushless DC motor drive circuit

Philips Electronics 

Philips Semiconductors

Brushless DC motor drive circuit

Preliminary specification

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.

SYMBOL

VP

VVMOT

VO

PARAMETER

supply voltage

input voltage to the output

driver stages

driver output voltage

ILIM

current limiting

CONDITIONS

note 1

IO = 100 mA; lower transistor

IO = 100 mA; upper transistor

VVMOT = 14.5 V; RO = 47 Ω

Note

1. An unstabilized supply can be used.

MIN.

4

3

TYP.

−

−

MAX.

18

18

UNIT

V

V

−

−

1.05 −

150

200

0.35 V

−

V

250

mA

ORDERING INFORMATION

TYPE

NUMBER

TDF5242T

NUMBER

SO28

PACKAGE

DESCRIPTION

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

VERSION

SOT136-1

1997 Sep 12

2

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