Datasheet TDA5145T, TDA5145 Datasheet (Philips)

INTEGRATED CIRCUITS

DATA SH EET

TDA5145

Brushless DC motor drive circuit

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

Philips Semiconductors

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.

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

V

P

V

VMOT

supply voltage note 1 4 − 18 V input voltage to the output driver

note 2 1.7 − 16 V

stages V I

DO

LIM

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

current limiting V

= 10 V; RO= 1.2 Ω 1.8 2.0 2.5 A

VMOT

Notes

1. An unstabilized supply can be used.

2. V

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

VMOT

ORDERING INFORMATION

PACKAGE

TYPE NUMBER

PINS PIN POSITION MATERIAL CODE

TDA5145 28 DIL plastic SOT117-1 TDA5145T 28 SOL plastic SOT136-1

June 1994 2

Philips Semiconductors Product speciﬁcation

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Brushless DC motor drive circuit TDA5145

BLOCK DIAGRAM

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Pin numbers for both DIL and SOL packages are identical.

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Fig.1 Block diagram.

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Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

PINNING

SYMBOL PIN

MOT1 1 and 2 driver output 1 TEST 3 test input/output n.c. 4 not connected MOT2 5 and 6 driver output 2 VMOT 7 and 8 input voltage for the output driver stages BRAKE 9 brake input; this pin may not be left ﬂoating, a LOW level voltage must be applied to disable

DIR 10 direction control input; this pin may not be left ﬂoating FG 11 frequency generator: output of the rotation speed (open collector digital output) GND2 12 ground supply return for control circuits V

P

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

−AMP IN 19 inverting input of the transconductance ampliﬁer n.c. 20 not connected RESET 21 reset input; this pin may not be left ﬂoating, a LOW level voltage must be applied to disable

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

(1)

this function

13 supply voltage

this function

DESCRIPTION

Note

1. Pin numbers for both DIL and SOL packages are identical.

June 1994 4

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

FUNCTIONAL DESCRIPTION

The TDA5145 offers a sensorless three phase motor drive function. It is unique in its combination of sensorless motor drive and full-wave drive. The TDA5145 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 TDA5145 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.

• Direction of rotation controlled by one pin.

• Uncommitted operational transconductance amplifier

(OTA), with a high output current, for use as a control

Fig.2 Pin configuration.

amplifier.

• Brake function.

LIMITING VALUES

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

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V

P

V

I

supply voltage − 18 V input voltage; all pins except

VI< 18 V −0.3 VP + 0.5 V

VMOT

V

VMOT

V

O

V

I

VMOT input voltage −0.5 17 V output voltage

AMP OUT and FG GND V MOT0, MOT1, MOT2 and MOT3 −1V

input voltage CAP-ST, CAP-TI,

− 2.5 V

P VMOT

+ V

DHF

V V

CAP-CD and CAP-DC

T

stg

T

amb

P

tot

V

es

storage temperature −55 +150 °C operating ambient temperature 0 +70 °C total power dissipation see Figs 3 and 4 −− W electrostatic handling see Chapter “Handling” − 2000 V

June 1994 5

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

3.08

1.75

P (W)

6

tot

4

2

0

50

0 200

50 100 150

70

T ( C)

handbook, halfpage

Fig.3 Power derating curve (SOT117-1; DIL28).

HANDLING

amb

MBD866

o

MBD557

o

T ( C)

amb

P (W)

1.62

3

tot

2

1

0

50

0 200

50 100 150

Fig.4 Power derating curve (SOT136-1; SO28L).

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.

CHARACTERISTICS

= 14.5 V; T

V

P

=25°C; unless otherwise speciﬁed.

amb

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

Supply

V

P

I

P

V

VMOT

supply voltage note 1 4 − 18 V supply current note 2 − 6.8 7.8 mA input voltage to the output driver

see Fig.1 1.7 − 16 V

stages

Thermal protection

T

SD

local temperature at temperature

130 140 150 °C

sensor causing shut-down

∆T reduction in temperature before

after shut-down − T

− 30 − K

SD

switch-on

June 1994 6

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

MOT0; centre tap

V

I

V

CSW

∆V

CSW

input voltage −0.5 − V input bias current 0.5 V < VI< V comparator switching level note 3 ±20 ±25 ±30 mV variation in comparator switching

levels

V

hys

comparator input hysteresis − 75 −µV

MOT1, MOT2 and MOT3; see Fig.5

V

∆V

DO

OL

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

variation in saturation voltage between lower transistors

∆V

OH

variation in saturation voltage between upper transistors

I

LIM

t

r

t

f

V

DHF

V

DLF

I

DM

current limiting V rise time switching output V fall time switching output V diode forward voltage (diode DH)I

diode forward voltage (diode DL)I

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’

I

b

C

I

V

offset

input bias current −− 650 nA input capacitance − 4 − pF input offset voltage −− 10 mV

AMP OUT (open collector)

I V V

sink

sat O

output sink current 40 −−mA saturation voltage II=40mA − 1.5 2.1 V

output voltage −0.5 − +18 V SR slew rate R G

tr

transfer gain 0.3 −−S

DIR

V

IH

V

IL

I

IL

I

IH

HIGH level input voltage 4 V < VP< 18 V 2.0 −−V

LOW level input voltage 4 V < VP<18V −− 0.8 V

LOW level input current −−20 −µA

HIGH level input current − 20 −µA

VMOT

− 1.5 V −10 −−µA

VMOT

−− 3mV

I

= 1000 mA − 1.6 1.85 V

O

IO= 100 mA −− 180 mV

IO= −100 mA −− 180 mV

= 10 V; RO= 1.2 Ω 1.8 2.0 2.5 A

VMOT

= 15 V; see Fig.6 5 10 15 µs

VMOT

= 15 V; see Fig.6 10 15 20 µs

VMOT

=−500 mA;

O

−− 1.5 V

notes 4 and 5; see Fig.1

= 500 mA;

O

−1.5 −−V

notes 4 and 5; see Fig.1

−− ±V

= 330 Ω; CL=50pF − 60 − mA/µs

L

P

V

June 1994 7

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

RESET

V

IH

HIGH level input voltage reset mode;

4V<VP<18V

V

IL

LOW level input voltage normal mode;

4V<VP<18V

I

IL

I

IH

LOW level input current VI= 2.0 V −−20 −µA

HIGH level input current VI= 0.8 V − 20 −µA

BRAKE

V

IH

HIGH level input voltage brake mode;

4V<VP<18V

V

IL

LOW level input voltage normal mode;

4V<VP<18V

I

IL

I

IH

LOW level input current VI= 2.0 V −−20 −µA

HIGH level input current VI= 0.8 V − 20 −µA

FG (open collector)

V

OL

V

OH(max)

t

THL

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

maximum HIGH level output voltage V

HIGH-to-LOW transition time CL= 50 pF; RL=10kΩ− 0.5 −µs

ratio of FG frequency and

commutation frequency δ duty factor − 50 − %

2.0 −−V

−− 0.8 V

2.0 −−V

−− 0.8 V

P

−−V

− 1:2 −

CAP-ST

I

sink

I

source

V

SWL

V

SWH

CAP-TI

I

sink

I

source

V

SWL

V

SWM

V

SWH

CAP-CD

I

sink

I

source

I

sink/Isource

V

IL

V

IH

output sink current 1.5 2.0 2.5 µA

output source current −2.5 −2.0 −1.5 µA

LOW level switching voltage − 0.20 − V

HIGH level switching voltage − 2.20 − V

output sink current − 28 −µA

output source current 0.2 V < V

0.3V<V

< 0.3 V −−57 −µA

CAP-TI

< 2.2 V −−5−µA

CAP-TI

LOW level switching voltage − 50 − mV

MIDDLE level switching voltage − 0.30 − V

HIGH level switching voltage − 2.20 − V

output sink current 10.6 16.2 22 µA

output source current −5.3 −8.1 −11 µA

ratio of sink to source current 1.85 2.05 2.25

LOW level input voltage 850 875 900 mV

HIGH level input voltage 2.3 2.4 2.55 V

June 1994 8

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

CAP-DC

I

sink

I

source

I

sink/Isource

V

IL

V

IH

Notes

1. An unstabilized supply can be used.

2. V

VMOT=VP

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.

output sink current 10.1 15.5 20.9 µA

output source current −20.9 −15.5 −10.1 µA

ratio of sink to source current 0.9 1.025 1.15

LOW level input voltage 850 875 900 mV

HIGH level input voltage 2.3 2.4 2.55 V

, all other inputs at 0 V; all outputs at VP; IO= 0 mA.

Fig.5 Switching levels with respect to MOT1, MOT2 and MOT3.

Fig.6 Output transition time measurement.

June 1994 9

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

APPLICATION INFORMATION

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

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

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.

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.

Table 1 Output states.

STATE MOT1

(1)

MOT2

(1)

MOT3

(1)

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

Note

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

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

June 1994 10

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

provided that will generate commutation pulses when no zero-crossings in the motor voltage are available.

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

The TDA5145 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 TDA5145 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)

f

osc

=

1

---------------------------------- K

I× p×

t

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

2π

J

where:

K

= torque constant (N.m/A)

t

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

= 5 Hz. If the damping is high

osc

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

C

==

:

C1

8.1 10

×

-------------------------f 1.3×

6–

6231

(C in nF)

------------ f

C1

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

= (2.15 × C) s (with C in µF)

start

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 TDA5145 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. The oscillation of the motor is given by:

June 1994 11

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:

CAP-CD

6231

------------ 400

(choose 18 nF)

15.6==

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.

Philips Semiconductors Product speciﬁcation

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Brushless DC motor drive circuit TDA5145

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June 1994 12

Fig.8 Typical application of the TDA5145 as a scanner driver, with use of OTA.

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Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

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 13

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

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).

Fig.10 Typical CAP-TI and V

voltage waveforms in normal running mode.

MOT1

Other design aspects

There are other design aspects concerning the application of the TDA5145 besides the commutation function. They are:

• Generation of the tacho signal FG

• General purpose operational transconductance

amplifier (OTA)

• Motor control

• Direction function

• Brake function

• Reliability.

FG

SIGNAL

The FG signal is generated in the TDA5145 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.

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 V

− 1.7 V. The high sink current enables the

P

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.

Example: a 3-phase motor with 6 magnetic pole-pairs at 1500 rpm and with a full-wave drive has a commutation

June 1994 14

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

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).

D

IRECTION FUNCTION

If the voltage at pin 10 is <0.8 V, the motor is running in one direction (depending on the motor connections). If the voltage at pin 10 >2.0 V, the motor is running in the other direction.

BRAKE

FUNCTION

If the voltage at pin 9 is >2.0 V, the motor brakes. In that condition, the 3 outputs MOT1, MOT2 and MOT3 are

Table 3 Switching sequence after a reset pulse.

DIR

(1)

RESET

(1)

MOT1

(1)

H H Z L H reset H L Z L H normal direction mode HLHLZ HLHZL HLZHL HLLHZ HLLZH

L H H L Z reset L L H L Z reverse direction mode LLZLH LLLZH LLLHZ LLZHL LLHZL

forced at a LOW voltage level and the current limitation is done internally by the sink drivers.

RESET

FUNCTION

If the voltage at pin 21 is >2.0 V, the output states are shown in Table 2.

Table 2 Output states if V

RESET

> 2.0 V.

DRIVER OUTPUT STATE

MOT1 Z MOT2 L MOT3 H

Note

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

MOT2

(1)

DIR

(1)

FUNCTION

sequence

(1)

Note

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

June 1994 15

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

Table 4 Priority of function.

BRAKE

(1)

TEST

(1)

RESET

(1)

L L L normal L L H reset L H L test L H H test H L L brake H L H brake H H L brake H H H brake

Note

1. L = LOW state; H = HIGH state.

FUNCTION

RELIABILITY 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.

June 1994 16

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

PACKAGE OUTLINES

handbook, full pagewidth

seating plane

3.9

3.4

1.7

max

28

1

2.54

(13x)

36.0

35.0

1.7 max

0.53 max

15

14

0.51 min

14.1

13.7

max

0.254

4.0

15.80

15.24

5.1

max

M

0.32 max

15.24

17.15

15.90

MSA264

Dimensions in mm.

Fig.11 Plastic dual in-line package; 28 leads (600 mil) (SOT117-1; DIP28).

June 1994 17

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

handbook, full pagewidth

S

pin 1

index

114

0.9

0.4

(4x)

18.1

17.7

1.27

0.49

0.36

0.1 S

1528

0.25 M

(28x)

2.45

2.25

0.3

0.1

10.65

10.00

detail A

7.6

7.4

1.1

0.5

1.1

1.0

0.32

0.23

0 to 8

MBC236 - 1

A

2.65

2.35

o

Dimensions in mm.

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

June 1994 18

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

SOLDERING Plastic small-outline packages

YWAVE

B 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.

EPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING

R

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.

Plastic dual in-line packages

BY DIP OR WAVE The maximum permissible temperature of the solder is

260 °C; this temperature must not be in contact with the joint for more than 5 s. The total contact time of successive solder waves must not exceed 5 s.

The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified storage maximum. If the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit.

R

EPAIRING SOLDERED JOINTS

Apply a low voltage soldering iron below the seating plane (or not more than 2 mm above it). If its temperature is below 300 °C, it must not be in contact for more than 10 s; if between 300 and 400 °C, for not more than 5 s.

June 1994 19

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

DEFINITIONS

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.

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.

June 1994 20

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

NOTES

June 1994 21

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

NOTES

June 1994 22

Philips Semiconductors Product speciﬁcation

Brushless DC motor drive circuit TDA5145

NOTES

June 1994 23

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373061/1500/02/pp24 Date of release: June 1994 Document order number: 9397 735 50011

Philips Semiconductors