Philips TDA5240T Datasheet

Product specification File under Integrated Circuits, ICO1

Philips Semiconductors

November 96

Philips Semiconductors

Product specification

Brushless DC motor drive circuit

FEATURES .Full-wave commutation (using push/pull drivers at the output stages) without position sensors

.Built-in start-up circuit .Optimum commutation independent on motor type or motor loading .Built-in flyback diodes .Three push-pull outputs:

-0.85 A output current

-built-in current limiter .Thermal protection .Soft slope outputs for low radiation. .Low current consumption by adaptative base-drive .Tacho output without extra sensor. .Comparator for external position generator (PG) signal .Built-in multiplexer combining internal FG and external PG signal on one pin for easy use with a controlling

microprocessor

.Linear control of the output stages .PG signal output.

TDA5240T

APPLICATIONS

.General purpose spindle driver ( e.g. VCR scanner motor).

GENERAL DESCRIPTION The TDA5240T is a bipolar integrated circuit used to drive brushless DC motors in full-wave mode. The device senses

the rotor position using an EMF-sensing technique and is ideally suited as a drive circuit for VCR scanner motors.

QUICK REFERENCE DATA Measured over full voltage and temperature ranges

SYMBOL

IUM

Note

1. An unstabilized supply can be used; Transients of 2 V allowed with max slope 0.1 V/J.ls.

supply voltage range (note 1 ) 4

current limiting

output voltage at 10 = 100 mA(Upper + Lower transistor)

PARAMETER MIN.

0.6

TYPo MAX. UNIT

0.85

0.93

1.05

November 96

2/19

Philips Semiconductors

Product specification

Brushless DC motor drive circuit

ORDERING INFORMATION

TYPE NUMBER

TDA5240T

NAME

SO20L

20-pin small-outline; plastic

PACKAGE

DESCRIPTION

TDA5240T

VERSION

SOT163AH17

Fig.1 Power derating curve

3119November 96

Philips Semiconductors

Product specification

BLOCK DIAGRAM

CAPCDSI

CAPCDM

Brushless DC motor drive circuit

r CAP-CPC

CTLIf'I

CAPST

TDA5240T

MOT1

CAPTII

PGOUTI

PGFG

MOT2

I I

,,1

'\'

MOT3

IMOTO

L PGlfr .GND2- -tND1- J

Fig.2 Block diagram.

November 96

4/19

Philips Semiconductors Product specification

TDA5240TBrushless DC motor drive circuit

PINNING

SYMBOL PIN DESCRIPTION

GND1 1 ground (0 V) motor supply return for output stages n.c. 2 not connected MOT2 3 driver output 2 n.c. 4 not connected V

PGIN 6 position generator: input from the position detector sensor to the position detector

FGPG 7 FG/PG (open collector) GND2 8 ground supply return for control circuits PGOUT 9 position generator output of the position detector stage CAP–CDM 10 external capacitor connection for commutation delay timing CAP–CDS 11 external capacitor connection for commutation delay timing copy CAP–ST 12 external capacitor connection for start–up oscillator CAP–TI 13 external capacitor connection for timing CTL IN 14 non–inverting input of the control amplifier MOT0 15 input from the start point of the motor coils CAP–CPC 16 external capacitor for stability of control loop n.c. 17 not connected MOT3 18 driver output 3 n.c. 19 not connected MOT1 20 driver output 1

5 positive supply voltage

stage (optional)

GND1

n.c.

MOT2

PGIN

FGPG

GND2

PGOUT

CAP–CDM

10 11

TDA5240T

Fig. 3 Pin configuration

MOT1

n.c.

MOT3

n.c.

CAP–CPC

MOT0

CTL IN

CAP–TI

CAP–ST

CAP–CDS

November 96

5/19

Philips Semiconductors

Product specification

Brushless DC motor drive circuit

FUNCTIONAL DESCRIPTION The TDA5240T offers a sensorless three phase motor drive function. It is unique in its combination of sensorless motor

drive and full-wave drive. The TDA5240T 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 TDA5240T 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 (0.85 A) .Outputs protected by current limiting and thermal protection of each output transistor .Low current consumption by adaptive base-drive .Soft slope outputs for low radiation .Accurate frequency generator (FG) by using the motor EMF .Comparator for external position generator (PG) signal .Built-in multiplexer combining internal FG and external PG signals on one pin for easy use with a controlling

microprocessor

.Linear control of the output stages.

TDA5240T

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 134).

Vo Vo VI

I Ptot

~ I Tamb

SYMBOL

PARAMETER

supply voltage

input voltage; all pins except Vp (VI < 8 V)

output voltage; PGOUT and PG/FG output voltage; MOTO, MOT1, MOT2 and MOT3

input voltage; CAP-ST, CAP- TI, CAP-CD and CAP-DC

I total power dissipation

I~ge temperature range

operating ambient temperature range

-0.3 GND

-1

-55

-10

MIN.

MAX.

Vp + 0.5 Vp

Vp + VD

2.5 see power

derating curve

+150 +70

UNIT

v v v v v

°c °c

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