DATA SHEET
Product specification
File under Integrated Circuits, IC11
1998 Oct 27
INTEGRATED CIRCUITS
TDA5145TS
Brushless DC motor drive circuit
1998 Oct 27
2
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
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
Motor brake facility
Direction control input
Reset function.
APPLICATIONS
General purpose spindle driver e.g.:
Hard disk drive
Tape drive
Optical disk drive.
GENERAL DESCRIPTION
The TDA5145TS 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.
Notes
1. An unstabilized supply can be used.
2. V
VMOT
= V
P
; all outputs I
o
= 0 mA.
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
P
supply voltage
note 1
4
-
18
V
V
i(VMOT)
input voltage to the output driver
stages
note 2
1.7
-
16
V
V
DO
drop-out output voltage
I
o
= 100 mA
-
0.90
1.05
V
I
LIM
current limiting
V
VMOT
= 10 V; R
o
= 1.2
1.8
2.0
2.5
A
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
TDA5145TS
SSOP24
plastic shrink small outline package; 24 leads;
body width 5.3 mm
SOT340-1
1998 Oct 27
3
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MGR391
START-UP
OSCILLATOR
PUSH/PULL
FLYBACK
OUTPUT
DRIVER
STAGE 1
1, 2
MOT1
8
18
6, 7
VMOT
4, 5
MOT2
ADAPTIVE
COMMUTATION
DELAY
COMMUTATION
LOGIC
TIMING
THERMAL
PROTECTION
DL
DH
OUTPUT DRIVER
STAGE 2
20,
21
MOT3
OUTPUT DRIVER
STAGE 3
EMF COMPARATORS
22
MOT0
RESET
RESET
BRAKE
BRAKE
10
11
GND2
23, 24
GND1
VP
15
CAP-TI
CAP-CD
3
TEST
12
CAP-DC
CAP-ST
13
14
DIRECTION
CONTROL
DIR
9
TDA5145TS
1998 Oct 27
4
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
PINNING
SYMBOL
PIN
DESCRIPTION
MOT1
1
driver output 1
MOT1
2
driver output 1
TEST
3
test input/output
MOT2
4
driver output 2
MOT2
5
driver output 2
VMOT
6
input voltage for the output driver
stages
VMOT
7
input voltage for the output driver
stages
BRAKE
8
brake input; this pin may not be left
floating, a LOW-level voltage must
be applied to disable this function
DIR
9
direction control input; this pin may
not be left floating
GND2
10
ground supply return for control
circuits
V
P
11
supply voltage
CAP-CD
12
external capacitor connection for
adaptive communication delay
timing
CAP-DC
13
external capacitor connection for
adaptive communication delay
timing copy
CAP-ST
14
external capacitor connection for
start-up oscillator
CAP-TI
15
external capacitor connection for
timing
n.c.
16
not connected
n.c.
17
not connected
RESET
18
reset input; this pin may not be left
floating, a LOW-level voltage must
be applied to disable this function
n.c.
19
not connected
MOT3
20
driver output 3
MOT3
21
driver output 3
MOT0
22
input from the star point of the motor
coils
GND1
23
ground (0 V) motor supply return for
output stages
GND1
24
ground (0 V) motor supply return for
output stages
FUNCTIONAL DESCRIPTION
The TDA5145TS offers a sensorless 3-phase motor drive
function. It is unique in its combination of sensorless motor
drive and full-wave drive. The TDA5145TS 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 TDA5145TS 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
Direction of rotation controlled by one pin
Brake function.
Fig.2 Pin configuration.
handbook, halfpage
MOT1
MOT1
TEST
MOT2
MOT2
VMOT
VMOT
BRAKE
DIR
GND2
VP
CAP-CD
GND1
GND1
MOT0
MOT3
n.c.
RESET
MOT3
n.c.
n.c.
CAP-TI
CAP-ST
CAP-DC
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
TDA5145TS
MGR392
1998 Oct 27
5
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
HANDLING
Every pin withstands the ESD test according to
"MIL-STD-883C class 2". Method 3015 (HBM 1500
; 100 pF) 3 pulses
positive and 3 pulses negative on each pin referenced to ground.
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P
supply voltage
-
18
V
V
I(n)
input voltage; all pins except
VMOT
V
I
< 18 V
-
0.3
V
P
+ 0.5
V
V
I(VMOT)
VMOT input voltage
-
0.5
+17
V
V
O
output voltage MOT0, MOT1,
MOT2 and MOT3
-
1
V
VMOT
+ V
dFD
V
V
I(n1)
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 Fig. 3
-
-
W
V
es
electrostatic handling
see Chapter "Handling"
-
2000
V
Fig.3 Power derating curve.
handbook, halfpage
-
50
2
0
0
200
MGL529
50
100
150
Ptot
(W)
Tamb (
C)
1.00
0.57
70
1
1998 Oct 27
6
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
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
-
6.8
7.8
mA
V
i(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
bias
input bias current
0.5 V < V
i
< V
VMOT
-
1.5 V
-
10
-
-
A
V
CSW
comparator switching level
note 3
20
25
30
mV
V
CSW
variation in comparator switching
levels
-
-
3
mV
V
hys
comparator input hysteresis
-
75
-
V
MOT1, MOT2 and MOT3; see Fig.4
V
DO
drop-out output voltage
I
o
= 100 mA
-
0.9
1.05
V
I
o
= 1000 mA
-
1.6
1.85
V
V
sat(lt)
variation in saturation voltage
between lower transistors
I
o
= 100 mA
-
-
180
mV
V
sat(ut)
variation in saturation voltage
between upper transistors
I
o
=
-
100 mA
-
-
180
mV
I
LIM
current limiting
V
VMOT
= 10 V; R
o
= 1.2
1.8
2.0
2.5
A
t
r
rise time switching output
V
VMOT
= 15 V; see Fig.5
5
10
15
s
t
f
fall time switching output
V
VMOT
= 15 V; see Fig.5
10
15
20
s
V
dF(DH)
diode forward voltage (diode D
H
)
I
o
=
-
500 mA;
notes 4 and 5; see Fig.1
-
-
1.5
V
V
dF(DL)
diode forward voltage (diode D
L
)
I
o
= 500 mA;
notes 4 and 5; see Fig.1
-
1.5
-
-
V
I
dM
peak diode current
note 5
-
-
2.5
A
DIR
V
IH
HIGH-level input voltage
4 V < V
P
< 18 V
2.0
-
-
V
V
IL
LOW-level input voltage
4 V < V
P
< 18 V
-
-
0.8
V
I
IL
LOW-level input current
-
-
20
-
A
I
IH
HIGH-level input current
-
20
-
A
1998 Oct 27
7
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
RESET
V
IH
HIGH-level input voltage
reset mode;
4 V < V
P
< 18 V
2.0
-
-
V
V
IL
LOW-level input voltage
normal mode;
4 V < V
P
< 18 V
-
-
0.8
V
I
IL
LOW-level input current
V
i
= 2.0 V
-
-
20
-
A
I
IH
HIGH-level input current
V
i
= 0.8 V
-
20
-
A
BRAKE
V
IH
HIGH-level input voltage
brake mode;
4 V < V
P
< 18 V
2.0
-
-
V
V
IL
LOW-level input voltage
normal mode;
4 V < V
P
< 18 V
-
-
0.8
V
I
IL
LOW-level input current
V
i
= 2.0 V
-
-
20
-
A
I
IH
HIGH-level input current
V
i
= 0.8 V
-
20
-
A
CAP-ST
I
o(sink)
output sink current
1.5
2.0
2.5
A
I
o(source)
output source current
-
2.5
-
2.0
-
1.5
A
V
swL
LOW-level switching voltage
-
0.20
-
V
V
swH
HIGH-level switching voltage
-
2.20
-
V
CAP-TI
I
o(sink)
output sink current
-
28
-
A
I
o(source)
output source current
0.2 V < V
CAP-TI
< 0.3 V
-
-
57
-
A
0.3 V < V
CAP-TI
< 2.2 V
-
-
5
-
A
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
o(sink)
output sink current
10.6
16.2
22
A
I
o(source)
output source current
-
5.3
-
8.1
-
11
A
I
sink
/I
source
ratio of sink to source current
1.85
2.05
2.25
V
IL
LOW-level input voltage
850
875
900
mV
V
IH
HIGH-level input voltage
2.3
2.4
2.55
V
CAP-DC
I
o(sink)
output sink current
10.1
15.5
20.9
A
I
o(source)
output source current
-
20.9
-
15.5
-
10.1
A
I
sink
/I
source
ratio of sink to source current
0.9
1.025
1.15
V
IL
LOW-level input voltage
850
875
900
mV
V
IH
HIGH-level input voltage
2.3
2.4
2.55
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
1998 Oct 27
8
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
Notes
1. An unstabilized supply can be used.
2. V
VMOT
= V
P
, all other inputs at 0 V; all outputs at V
P
; I
o
= 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.4 Switching levels with respect to MOT1, MOT2 and MOT3.
handbook, full pagewidth
MGR381
MOT1, MOT2 and MOT3
comparator threshold
voltages
hysteresis 75
V typ.
VMOT0
VCSW
VCSW
back EMF signal
Fig.5 Output transition time measurement.
handbook, halfpage
12.5 V
2.0 V
MGR382
12.5 V
2.0 V
tr
tf
1998 Oct 27
9
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
APPLICATION INFORMATION
(1) Value selected for 3 Hz start-up oscillator frequency.
Fig.6 Application diagram.
handbook, full pagewidth
MGR393
220
nF
24
GND1
23
22
21
20
19
18
17
16
15
14
13
(1)
18 nF
18 nF
10
F
VMOT
VP
10
nF
1
2
3
4
5
6
7
8
9
10
11
BRAKE DIR
12
TDA5145TS
Introduction (see Fig.7)
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. The sequence of
the six possible states of the outputs is given in Table 1.
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; note 1
Note
1. H = HIGH state; L = LOW state; Z = high-impedance
OFF-state.
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.
A timing function is incorporated into the device for internal
timing and for timing of the reverse rotation detection.
STATE
MOT1
MOT2
MOT3
1
Z
L
H
2
H
L
Z
3
H
Z
L
4
Z
H
L
5
L
H
Z
6
L
Z
H
1998 Oct 27
10
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
The TDA5145TS is designed for systems with low current
consumption: use of I
2
L 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
A, 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
F)
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
TDA5145TS 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:
where:
K
t
= torque constant (N.m/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg.m
2
)
Example: J = 72
10
-
6
kg.m
2
, K
t
= 25
10
-
3
N.m/A, p = 6
and I = 0.5 A; this gives f
osc
= 5 Hz.
f
osc
1
2
K
t
I
p
J
-----------------------
-----------------------------------
=
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
F
(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
A and the discharging current 16.2
A; 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
A; maximum
delay = (0.076
C) ms (with C in nF)
Example: nominal commutation frequency = 900 Hz and
the lowest usable frequency = 400 Hz; thus:
(choose 18 nF)
The other capacitor, CAP-DC, is used to repeat the same
delay by charging and discharging with 15.5
A. The same
value can be chosen as for CAP-CD. Figure 8 illustrates
typical voltage waveforms.
C
8.1
10
6
f
1.3
--------------------------
6231
f
C1
-------------
=
=
CAP-CD
6231
400
-------------
15.6
=
=
1998 Oct 27
11
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
Fig.7 Typical application of the TDA5145TS as a scanner driver.
handbook, full pagewidth
MGR394
D
D
TP
TN
TN
22
20, 21
4, 5
1, 2
EMF
COMPARATORS
D
D
TP
TN
TN
D
D
TP
8
13
12
3
15
10
14
TN
TEST
TN
START-UP
OSCILLATOR
BRAKE
GND1
DIR
TDA5145TS
18
6, 7
23, 24
RESET
BRAKE
RESET VMOT
DIRECTION
CONTROL
GND2
VP
THERMAL
PROTECTION
TIMING
ADAPTIVE
COMMUNICATION
DELAY
COMMUNICATION
LOGIC
MOTOR
11
9
220 nF
18 nF
18 nF
10 nF
1998 Oct 27
12
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
Fig.8 CAP-CD and CAP-DC typical voltage waveforms in normal running mode.
handbook, full pagewidth
MGH317
voltage
on CAP-CD
voltage
on CAP-DC
t
T
HE 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
A, from
0.2 to 0.3 V. Above this level it is charged with a current of
5
A, 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
A. The watchdog time is
the time taken to charge the capacitor with a current of
5
A, 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 of 10 nF for CAP-TI 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 in Fig.9.
1998 Oct 27
13
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
Fig.9 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).
handbook, full pagewidth
MGH318
VMOT 1
voltage
on CAP-TI
Other design aspects
There are other design aspects concerning the application
of the TDA5145TS besides the commutation function.
They are:
Direction function
Brake function
Reliability.
D
IRECTION FUNCTION
If the voltage at pin 9 is less than 0.8 V, the motor is
running in one direction (depending on the motor
connections). If the voltage at pin 9 is greater than 2.0 V,
the motor is running in the opposite direction.
BRAKE
FUNCTION
If the voltage at pin 8 is greater than 2.0 V, the motor
brakes. In that condition, the 3 outputs MOT1, MOT2 and
MOT3 are forced to a LOW voltage level and the current
limitation is performed internally by the sink drivers.
RESET
FUNCTION
If the voltage at pin 18 is greater than 2.0 V, the output
states are shown in Table 2.
Table 2
Output states if V
RESET
> 2.0 V
Note
1. Z = high-impedance OFF-state; L = LOW state;
H = HIGH state.
DRIVER OUTPUT
STATE
(1)
MOT1
Z
MOT2
L
MOT3
H
1998 Oct 27
14
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
Table 3
Switching sequence after a reset pulse; note 1
Note
1. Z = high-impedance OFF-state; L = LOW state; H = HIGH state.
Table 4
Priority of function; note 1
Note
1. L = LOW state; H = HIGH state.
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 ambient temperature becomes too high.
DIR
RESET
MOT1
MOT2
DIR
FUNCTION
H
H
Z
L
H
reset
H
L
Z
L
H
normal direction
mode sequence
H
L
H
L
Z
H
L
H
Z
L
H
L
Z
H
L
H
L
L
H
Z
H
L
L
Z
H
L
H
H
L
Z
reset
L
L
H
L
Z
reverse direction
mode sequence
L
L
Z
L
H
L
L
L
Z
H
L
L
L
H
Z
L
L
Z
H
L
L
L
H
Z
L
BRAKE
TEST
RESET
FUNCTION
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
1998 Oct 27
15
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
PACKAGE OUTLINE
UNIT
A
1
A
2
A
3
b
p
c
D
(1)
E
(1)
(1)
e
H
E
L
L
p
Q
Z
y
w
v
REFERENCES
OUTLINE
VERSION
EUROPEAN
PROJECTION
ISSUE DATE
IEC
JEDEC
EIAJ
mm
0.21
0.05
1.80
1.65
0.38
0.25
0.20
0.09
8.4
8.0
5.4
5.2
0.65
1.25
7.9
7.6
0.9
0.7
0.8
0.4
8
0
o
o
0.13
0.1
0.2
DIMENSIONS (mm are the original dimensions)
Note
1. Plastic or metal protrusions of 0.20 mm maximum per side are not included.
1.03
0.63
SOT340-1
MO-150AG
93-09-08
95-02-04
X
w
M
A
A
1
A
2
b
p
D
H
E
L
p
Q
detail X
E
Z
e
c
L
v
M
A
(A )
3
A
1
12
24
13
0.25
y
pin 1 index
0
2.5
5 mm
scale
SSOP24: plastic shrink small outline package; 24 leads; body width 5.3 mm
SOT340-1
A
max.
2.0
1998 Oct 27
16
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
SOLDERING
Introduction
There is no soldering method that is ideal for all IC
packages. Wave soldering is often preferred when
through-hole and surface mounted components are mixed
on one printed-circuit board. However, wave soldering is
not always suitable for surface mounted ICs, or for
printed-circuits with high population densities. In these
situations reflow soldering is often used.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our
"Data Handbook IC26; Integrated Circuit Packages"
(order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all SSOP
packages.
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
Several techniques exist for reflowing; for example,
thermal conduction by heated belt. Dwell times vary
between 50 and 300 seconds depending on heating
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 minutes at
45
C.
Wave soldering
Wave soldering is not recommended for SSOP packages.
This is because of the likelihood of solder bridging due to
closely-spaced leads and the possibility of incomplete
solder penetration in multi-lead devices.
If wave soldering cannot be avoided, the following
conditions must be observed:
A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave)
soldering technique should be used.
The longitudinal axis of the package footprint must
be parallel to the solder flow and must incorporate
solder thieves at the downstream end.
Even with these conditions, only consider wave
soldering SSOP packages that have a body width of
4.4 mm, that is SSOP16 (SOT369-1) or
SSOP20 (SOT266-1).
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Maximum permissible solder temperature is 260
C, and
maximum duration of package immersion in solder is
10 seconds, if cooled to less than 150
C within
6 seconds. Typical dwell time is 4 seconds at 250
C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Repairing soldered joints
Fix the component by first soldering two diagonally-
opposite end leads. Use only a low voltage soldering iron
(less than 24 V) applied to the flat part of the lead. Contact
time must be limited to 10 seconds at up to 300
C. When
using a dedicated tool, all other leads can be soldered in
one operation within 2 to 5 seconds between
270 and 320
C.
1998 Oct 27
17
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
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.
1998 Oct 27
18
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
NOTES
1998 Oct 27
19
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5145TS
NOTES
Internet: http://www.semiconductors.philips.com
Philips Semiconductors a worldwide company
Philips Electronics N.V. 1998
SCA60
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Printed in The Netherlands
295102/750/01/pp20
Date of release: 1998 Oct 27
Document order number:
9397 750 04042
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