Datasheet TDA5144AT-C2 Datasheet (Philips)

DATA SH EET

Product speciﬁcation Supersedes data of March 1992 File under Integrated Circuits, IC11

June 1994

INTEGRATED CIRCUITS

Philips Semiconductors

TDA5144

Brushless DC motor drive circuit

June 1994 2

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

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.) – 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 TDA5144 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 requiring powerful output stages (current limit of 2.0 A). It can also be used in e.g. laser beam printer and other applications.

QUICK REFERENCE DATA

Measured over full voltage and temperature range.

Notes

1. An unstabilized supply can be used.

2. V

VMOT

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

ORDERING INFORMATION

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

supply voltage note 1 4 − 18 V

V

VMOT

input voltage to the output driver stages

note 2 1.7 − 16 V

V

DO

drop-out output voltage IO= 100 mA − 0.90 1.05 V

I

LIM

current limiting V

VMOT

= 10 V; RO= 1.2 Ω 1.8 2.0 2.4 A

TYPE NUMBER

PACKAGE

PINS PIN POSITION MATERIAL CODE

TDA5144AT 20 SOL plastic SOT163-1 TDA5144T 28 SOL plastic SOT136-1

June 1994 3

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

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Fig.1 Block diagram (SOT163-1; SO20L).

June 1994 4

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

PINNING

SYMBOL

DESCRIPTION

SO20 SO28

MOT1 1 1 and 2 driver output 1 TEST 2 3 test input/output n.c. 3 4 not connected MOT2 4 5 and 6 driver output 2 n.c. − 7 not connected VMOT 5 8 and 9 input voltage for the output driver stages GND3 6 10 ground supply; must be connected FG 7 1 1 frequency generator: output of the rotation speed (open collector digital output) GND2 8 12 ground supply return for control circuits V

P

9 13 supply voltage CAP-CD 10 14 external capacitor connection for adaptive communication delay timing CAP-DC 11 15 external capacitor connection for adaptive communication delay timing copy CAP-ST 12 16 external capacitor connection for start-up oscillator CAP-TI 13 17 external capacitor connection for timing +AMP IN 14 18 non-inverting input of the transconductance ampliﬁer

−AMP IN 15 19 inverting input of the transconductance ampliﬁer AMP OUT 16 20 transconductance ampliﬁer output (open collector) n.c. − 21 and 22 not connected MOT3 17 23 and 24 driver output 3 n.c. 18 25 not connected MOT0 19 26 input from the star point of the motor coils GND1 20 27 and 28 ground (0 V) motor supply return for output stages

June 1994 5

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

Fig.2 Pin configuration (SOT163-1; SO20L). Fig.3 Pin configuration (SOT136-1; SO28L).

FUNCTIONAL DESCRIPTION

The TDA5144 offers a sensorless three phase motor drive function. It is unique in its combination of sensorless motor drive and full-wave drive. The TDA5144 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 TDA5144 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 (2.0 A).

• Outputs protected by current limiting and thermal

protection of each output transistor.

• Low current consumption by adaptive base-drive.

• Soft-switching pulse output for low radiation.

• Accurate frequency generator (FG) by using the

motor EMF.

• Uncommitted operational transconductance amplifier (OTA), with a high output current, for use as a control amplifier.

June 1994 6

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

supply voltage − 18 V

V

I

input voltage; all pins except VMOT

VI< 18 V −0.3 VP + 0.5 V

V

VMOT

VMOT input voltage −0.5 17 V

V

O

output voltage

AMP OUT and FG GND V

P

V

MOT0, MOT1, MOT2 and MOT3 −1V

VMOT

+ V

DHF

V

I

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

− 2.5 V

T

stg

storage temperature −55 +150 °C

T

amb

operating ambient temperature 0 +70 °C

P

tot

total power dissipation see Figs 4 and 5 −− W

V

es

electrostatic handling see Chapter “Handling” − 500 V

Fig.4 Power derating curve (SOT163-1; SO20L).

P

tot

(W)

50

3

2

0

0 200

MBD536

50 100 150

T ( C)

amb

o

1.38

70

1

P

tot

(W)

50

3

2

0

0 200

MBD557

50 100 150

T ( C)

amb

o

1.62

1

Fig.5 Power derating curve (SOT136-1; SO28L).

HANDLING

Every pin withstands the ESD test according to

“MIL-STD-883C class 2”

. Method 3015 (HBM 1500 Ω, 100 pF) 3 pulses +

and 3 pulses − on each pin referenced to ground.

June 1994 7

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

CHARACTERISTICS

V

P

= 14.5 V; T

amb

=25°C; unless otherwise speciﬁed.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

supply voltage note 1 4 − 18 V

I

P

supply current note 2 − 6.3 7.2 mA

V

VMOT

input voltage to the output driver stages

see Fig.1 1.7 − 16 V

Thermal protection

T

SD

local temperature at temperature sensor causing shut-down

130 140 150 °C

∆T reduction in temperature before

switch-on

after shut-down − T

SD

− 30 − K

MOT0; centre tap

V

I

input voltage −0.5 − V

VMOT

V

I

input bias current 0.5 V < VI< V

VMOT

− 1.5 V −10 − 0 µA

V

CSW

comparator switching level note 3 ±20 ±25 ±30 mV

∆V

CSW

variation in comparator switching levels

−3 0 +3 mV

V

hys

comparator input hysteresis − 75 −µV

MOT1, MOT2 and MOT3

V

DO

drop-out output voltage IO= 100 mA − 0.9 1.05 V

I

O

= 1000 mA − 1.6 1.85 V

∆V

OL

variation in saturation voltage between lower transistors

IO= 100 mA −−180 mV

∆V

OH

variation in saturation voltage between upper transistors

IO= −100 mA −−180 mV

I

LIM

current limiting V

VMOT

= 10 V; RO= 1.2 Ω 1.8 2.0 2.5 A

t

r

rise time switching output V

VMOT

= 15 V; see Fig.6 5 10 15 µs

t

f

fall time switching output V

VMOT

= 15 V; see Fig.6 10 15 20 µs

V

DHF

diode forward voltage (diode DH)IO=−500 mA;

notes 4 and 5; see Fig.1

−−1.5 V

V

DLF

diode forward voltage (diode DL)IO= 500 mA;

notes 4 and 5; see Fig.1

−1.5 −−V

I

DM

peak diode current note 5 −−2.5 A

+AMP IN and −AMP IN

V

I

input voltage −0.3 − VP− 1.7 V differential mode voltage without

‘latch-up’

−−±V

P

V

I

b

input bias current −−650 nA

C

I

input capacitance − 4 − pF

V

offset

input offset voltage −−10 mV

June 1994 8

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

AMP OUT (open collector)

I

sink

output sink current 40 −−mA

V

sat

saturation voltage II=40mA − 1.5 2.1 V

V

O

output voltage −0.5 − +18 V

SR slew rate R

L

= 330 Ω; CL=50pF − 60 − mA/µs

G

tr

transfer gain 0.3 −−S

FG (open collector)

V

OL

LOW level output voltage IO= 1.6 mA −−0.4 V

V

OH(max)

maximum HIGH level output voltage

V

P

−−V

t

THL

HIGH-to-LOW transition time CL= 50 pF; RL=10kΩ− 0.5 −µs ratio of FG frequency and

commutation frequency

− 1:2 −

δ duty factor − 50 − %

CAP-ST

I

sink

output sink current 1.5 2.0 2.5 µA

I

source

output source current −2.5 −2.0 −1.5 µA

V

SWL

LOW level switching voltage − 0.20 − V

V

SWH

HIGH level switching voltage − 2.20 − V

CAP-TI

I

sink

output sink current − 28 −µA

I

source

output source current 0.2 V < V

CAP-TI

< 0.3 V −−57 −µA

0.3V<V

CAP-TI

< 2.2 V −−5−µA

V

SWL

LOW level switching voltage − 50 − mV

V

SWM

MIDDLE level switching voltage − 0.30 − V

V

SWH

HIGH level switching voltage − 2.20 − V

CAP-CD

I

sink

output sink current 10.6 16.2 22 µA

I

source

output source current −5.3 −8.1 −11 µA

I

sink/Isource

ratio of sink to source current 1.85 2.05 2.25

V

IL

LOW level input voltage 800 875 900 mV

V

IH

HIGH level input voltage 2.3 2.4 2.55 V

CAP-DC

I

sink

output sink current 10.1 15.5 20.9 µA

I

source

output source current −20.9 −15.5 −10.1 µA

I

sink/Isource

ratio of sink to source current 0.9 1.025 1.15

V

IL

LOW level input voltage 800 875 900 mV

V

IH

HIGH level input voltage 2.3 2.4 2.55 V

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

June 1994 9

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

Notes to the characteristics

1. An unstabilized supply can be used.

2. V

VMOT=VP

, all other inputs at 0 V; all outputs at VP;

IO= 0 mA.

3. Switching levels with respect to MOT1, MOT2 and MOT3.

4. Drivers are in the high-impedance OFF-state.

5. The outputs are short-circuit protected by limiting the current and the IC temperature.

Fig.6 Output transition time measurement.

APPLICATION INFORMATION

(1) Value selected for 3 Hz start-up oscillator frequency.

Fig.7 Application diagram without use of the operational transconductance amplifier (OTA).

June 1994 10

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

Introduction (see Fig.8)

Full-wave driving of a three phase motor requires three push-pull output stages. In each of the six possible states two outputs are active, one sourcing (H) and one sinking (L). The third output presents a high impedance (Z) to the motor, which enables measurement of the motor back-EMF in the corresponding motor coil by the EMF comparator at each output. The commutation logic is responsible for control of the output transistors and selection of the correct EMF comparator. In Table 1 the sequence of the six possible states of the outputs has been depicted.

Table 1 Output states.

Note

1. H = HIGH state; L = LOW state; Z = high-impedance OFF-state.

The zero-crossing in the motor EMF (detected by the comparator selected by the commutation logic) is used to calculate the correct moment for the next commutation, that is, the change to the next output state. The delay is calculated (depending on the motor loading) by the adaptive commutation delay block.

Because of high inductive loading the output stages contain flyback diodes. The output stages are also protected by a current limiting circuit and by thermal protection of the six output transistors.

The detected zero-crossings are used to provide speed information. The information has been made available on the FG output pin. This is an open collector output and provides an output signal with a frequency that is half the commutation frequency.

The system will only function when the EMF voltage from the motor is present. Therefore, a start oscillator is provided that will generate commutation pulses when no zero-crossings in the motor voltage are available.

STATE MOT1

(1)

MOT2

(1)

MOT3

(1)

1ZLH 2HLZ 3HZL 4ZHL 5LHZ 6LZH

A timing function is incorporated into the device for internal timing and for timing of the reverse rotation detection.

The TDA5144 also contains an uncommitted transconductance amplifier (OTA) that can be used as a control amplifier. The output is capable of directly driving an external power transistor.

The TDA5144 is designed for systems with low current consumption: use of I2L logic, adaptive base drive for the output transistors (patented).

Adjustments

The system has been designed in such a way that the tolerances of the application components are not critical. However, the approximate values of the following components must still be determined:

• The start capacitor; this determines the frequency of the start oscillator.

• The two capacitors in the adaptive commutation delay circuit; these are important in determining the optimum moment for commutation, depending on the type and loading of the motor.

• The timing capacitor; this provides the system with its timing signals.

T

HE START CAPACITOR (CAP-ST)

This capacitor determines the frequency of the start oscillator. It is charged and discharged, with a current of 2 µA, from 0.05 to 2.2 V and back to 0.05 V. The time taken to complete one cycle is given by: t

start

= (2.15 × C) s (with C in µF)

The start oscillator is reset by a commutation pulse and so is only active when the system is in the start-up mode. A pulse from the start oscillator will cause the outputs to change to the next state (torque in the motor). If the movement of the motor generates enough EMF the TDA5144 will run the motor. If the amount of EMF generated is insufficient, then the motor will move one step only and will oscillate in its new position. The amplitude of the oscillation must decrease sufficiently before the arrival of the next start pulse, to prevent the pulse arriving during the wrong phase of the oscillation.

June 1994 11

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

The oscillation of the motor is given by:

where:

K

t

= torque constant (N.m/A) I = current (A) p = number of magnetic pole-pairs J = inertia J (kg.m2)

Example: J = 72 × 10−6kg.m2, K = 25 × 10−3N.m/A, p = 6 and I = 0.5 A; this gives f

osc

= 5 Hz. If the damping is high then a start frequency of 2 Hz can be chosen or t = 500 ms, thus C = 0.5/2 = 0.25 µF (choose 220 nF).

T

HE ADAPTIVE COMMUTATION DELAY (CAP-CD AND

CAP-DC) In this circuit capacitor CAP-CD is charged during one

commutation period, with an interruption of the charging current during the diode pulse. During the next commutation period this capacitor (CAP-CD) is discharged at twice the charging current. The charging current is

8.1 µA and the discharging current 16.2 µA; the voltage range is from 0.9 to 2.2 V. The voltage must stay within this range at the lowest commutation frequency of interest, f

C1

:

(C in nF)

If the frequency is lower, then a constant commutation delay after the zero-crossing is generated by the discharge from 2.2 to 0.9 V at 16.2 µA; maximum delay = (0.076 × C) ms (with C in nF).

Example: nominal commutation frequency = 900 Hz and the lowest usable frequency = 400 Hz; so:

(choose 18 nF)

The other capacitor, CAP-DC, is used to repeat the same delay by charging and discharging with 15.5 µA. The same value can be chosen as for CAP-CD. Figure 9 illustrates typical voltage waveforms.

f

osc

1

2π

K

t

I× p×

J

---------------------- -

---------------------------------- -

=

C

8.1 10

6–

×

f1.3×

--------------------------

6231

f

C1

------------ -

==

CAP-CD

6231

400

------------ -

15.6==

June 1994 12

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

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Fig.8 Typical application of the TDA5144 as a scanner driver, with use of OTA.

June 1994 13

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

Fig.9 CAP-CD and CAP-DC typical voltage waveforms in normal running mode.

THE TIMING CAPACITOR (CAP-TI) Capacitor CAP-TI is used for timing the successive steps

within one commutation period; these steps include some internal delays.

The most important function is the watchdog time in which the motor EMF has to recover from a negative diode-pulse back to a positive EMF voltage (or vice versa). A watchdog timer is a guarding function that only becomes active when the expected event does not occur within a predetermined time.

The EMF usually recovers within a short time if the motor is running normally (<<ms). However, if the motor is motionless or rotating in the reverse direction, then the time can be longer (>>ms).

A watchdog time must be chosen so that it is long enough for a motor without EMF (still) and eddy currents that may stretch the voltage in a motor winding; however, it must be short enough to detect reverse rotation. If the watchdog time is made too long, then the motor may run in the wrong direction (with little torque).

The capacitor is charged, with a current of 57 µA, from

0.2 to 0.3 V. Above this level it is charged, with a current of 5 µA, up to 2.2 V only if the selected motor EMF remains in the wrong polarity (watchdog function). At the end, or, if the motor voltage becomes positive, the capacitor is discharged with a current of 28 µA. The watchdog time is the time taken to charge the capacitor, with a current of 5 µA, from 0.3 to 2.2 V.

To ensure that the internal delays are covered CAP-TI must have a minimum value of 2 nF. For the watchdog function a value for CAP-TI of 10 nF is recommended.

To ensure a good start-up and commutation, care must be taken that no oscillations occur at the trailing edge of the flyback pulse. Snubber networks at the outputs should be critically damped.

Typical voltage waveforms are illustrated by Fig.10.

June 1994 14

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

Fig.10 Typical CAP-TI and V

MOT1

voltage waveforms in normal running mode.

If the chosen value of CAP-TI is too small oscillations can occur in certain positions of a blocked rotor. If the chosen value is too large, then it is possible that the motor may run in the reverse direction (synchronously with little torque).

Other design aspects

There are other design aspects concerning the application of the TDA5144 besides the commutation function. They are:

• Generation of the tacho signal FG

• General purpose operational transconductance

amplifier (OTA)

• Possibilities of motor control

• Reliability.

FG

SIGNAL

The FG signal is generated in the TDA5144 by using the zero-crossing of the motor EMF from the three motor windings. Every zero-crossing in a (star connected) motor winding is used to toggle the FG output signal. The FG frequency is therefore half the commutation frequency. All transitions indicate the detection of a zero-crossing.

The accuracy of the FG output signal depends on the symmetry of the motor's electromagnetic construction, which also effects the satisfactory functioning of the motor itself.

Example: a 3-phase motor with 6 magnetic pole-pairs at 1500 rpm and with a full-wave drive has a commutation frequency of 25 × 6 × 6 = 900 Hz, and generates a tacho signal of 450 Hz.

T

HE OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA)

The OTA is an uncommitted amplifier with a high output current (40 mA) that can be used as a control amplifier. The common mode input range includes ground (GND) and rises to VP− 1.7 V. The high sink current enables the OTA to drive a power transistor directly in an analog control amplifier.

Although the gain is not extremely high (0.3 S), care must be taken with the stability of the circuit if the OTA is used as a linear amplifier as no frequency compensation has been provided.

The convention for the inputs (inverting or not) is the same as for a normal operational amplifier: with a resistor (as load) connected from the output (AMP OUT) to the positive supply, a positive-going voltage is found when the non-inverting input (+AMP IN) is positive with respect to the inverting input (−AMP IN). Confusion is possible because a ‘plus’ input causes less current, and so a positive voltage.

June 1994 15

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

MOTOR CONTROL DC motors can be controlled in an analog manner using

the OTA. For the analog control an external transistor is required.

The OTA can supply the base current for this transistor and act as a control amplifier (see Fig.8).

R

ELIABILITY

It is necessary to protect high current circuits and the output stages are protected in two ways:

• Current limiting of the ‘lower’ output transistors. The

‘upper’ output transistors use the same base current as the conducting ‘lower’ transistor (+15%). This means that the current to and from the output stages is limited.

• Thermal protection of the six output transistors is

achieved by each transistor having a thermal sensor that is active when the transistor is switched on. The transistors are switched off when the local temperature becomes too high.

It is possible, that when braking, the motor voltage (via the flyback diodes and the impedance on VMOT) may cause higher currents than allowed (>0.6 A). These currents must be limited externally.

June 1994 16

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

PACKAGE OUTLINES

handbook, full pagewidth

7.6

7.4

10.65

10.00

A

MBC234 - 1

0.3

0.1

2.45

2.25

1.1

0.5

0.32

0.23

1.1

1.0

0 to 8

o

2.65

2.35

detail A

S

13.0

12.6

0.1 S

110

1120

pin 1 index

0.9

0.4

(4x)

0.25 M

(20x)

0.49

0.36

1.27

Fig.11 Plastic small outline package; 20 leads; large body (SOT163-1; SO20L).

Dimensions in mm.

June 1994 17

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

handbook, full pagewidth

7.6

7.4

10.65

10.00

A

MBC236 - 1

0.3

0.1

2.45

2.25

1.1

0.5

0.32

0.23

1.1

1.0

0 to 8

o

2.65

2.35

detail A

S

18.1

17.7

0.1 S

114

1528

pin 1

index

0.9

0.4

(4x)

0.25 M

(28x)

0.49

0.36

1.27

Fig.12 Plastic small outline package; 28 leads; large body (SOT136-1; SO28L).

Dimensions in mm.

June 1994 18

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

SOLDERING Plastic small-outline packages

B

YWAVE

During placement and before soldering, the component must be fixed with a droplet of adhesive. After curing the adhesive, the component can be soldered. The adhesive can be applied by screen printing, pin transfer or syringe dispensing.

Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder bath is 10 s, if allowed to cool to less than 150 °C within 6 s. Typical dwell time is 4 s at 250 °C.

A modified wave soldering technique is recommended using two solder waves (dual-wave), in which a turbulent wave with high upward pressure is followed by a smooth laminar wave. Using a mildly-activated flux eliminates the need for removal of corrosive residues in most applications.

B

Y SOLDER PASTE REFLOW

Reflow soldering requires the solder paste (a suspension of fine solder particles, flux and binding agent) to be

applied to the substrate by screen printing, stencilling or pressure-syringe dispensing before device placement.

Several techniques exist for reflowing; for example, thermal conduction by heated belt, infrared, and vapour-phase reflow. Dwell times vary between 50 and 300 s according to method. Typical reflow temperatures range from 215 to 250 °C.

Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 min at 45 °C.

R

EPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING

IRON OR PULSE

-HEATED SOLDER TOOL)

Fix the component by first soldering two, diagonally opposite, end pins. Apply the heating tool to the flat part of the pin only. Contact time must be limited to 10 s at up to 300 °C. When using proper tools, all other pins can be soldered in one operation within 2 to 5 s at between 270 and 320 °C. (Pulse-heated soldering is not recommended for SO packages.)

For pulse-heated solder tool (resistance) soldering of VSO packages, solder is applied to the substrate by dipping or by an extra thick tin/lead plating before package placement.

DEFINITIONS

LIFE SUPPORT APPLICATIONS

These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale.

Data sheet status

Objective speciﬁcation This data sheet contains target or goal speciﬁcations for product development. Preliminary speciﬁcation This data sheet contains preliminary data; supplementary data may be published later. Product speciﬁcation This data sheet contains ﬁnal product speciﬁcations.

Limiting values

Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the speciﬁcation is not implied. Exposure to limiting values for extended periods may affect device reliability.

Application information

Where application information is given, it is advisory and does not form part of the speciﬁcation.

June 1994 19

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5144

NOTES

Philips Semiconductors

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373061/1500/02/pp20 Date of release: June 1994 Document order number: 9397 735 60011