Document Outline
- FEATURES
- APPLICATIONS
- GENERAL DESCRIPTION
- QUICK REFERENCE DATA
- ORDERING AND PACKAGE INFORMATION
- PINNING
- FUNCTIONAL DESCRIPTION
- LIMITING VALUES
- HANDLING
- CHARACTERISTICS
- APPLICATION INFORMATION
- SWITCHING SEQUENCE AFTER A RESET PULSE
- PRIORITY OF FUNCTION
- RELIABILITY
- SOLDERING
- PACKAGE
- Data sheet status
- Definitions
- Disclaimers
Philips
Semiconductors
TDA5146T
Brushless DC motor drive circuit
Product specification
1994 May 18
INTEGRATED CIRCUITS
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
2
1994 May 18
FEATURES
Fullwave commutation (using push/pull drivers at the output stages) without position sensors
Builtin startup circuit
Three pushpull outputs:
2 A output current (Typical)
Builtin current limiter
Thermal protection
Soft switching outputs
Flyback diodes
Tacho output sensor
Brake function
Direction control input
Reset function
FET driver stage to be used in a buck converter
APPLICATIONS
General purpose spindle driver (e.g., HDD, tape driver)
GENERAL DESCRIPTION
The TDA5146T is a bipolar integrated circuit used to drive brushless DC motors in fullwave mode. The device senses the rotor position using
an EMF sensing technique and is ideally suited as a drive circuit for a hard disk drive motor or tape drive.
QUICK REFERENCE DATA
Measured over full voltage and temperature ranges
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
P
Supply voltage range (Note 1)
4
18
V
Vsup
Supply for the FET driver voltage range
4
18
V
V
VMOT
Input voltage to the output driver stages (see Fig. 1)
1.7
16
V
V
D
o
Driver output voltage drop I
O
= 100 mA
0.9
1.05
V
I
LIM
Current limiting
1.80
2.0
2.5
A
NOTES:
1. An unstabilized supply can be used
2. V
VMOT
=V
P
; all outputs I
O
= 0 mA
ORDERING AND PACKAGE INFORMATION
Type n mber
Package
Type number
Name
Description
Version
TDA5146T
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
3
GND2
VP
GND1
VSUP
PWMOUT
BRAKE
RESET VMOT
Figure 1. Block diagram
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
4
PINNING
Symbol
Pin
Description
CAPCDS
1
external capacitor connection for adaptive commutation delay timing copy
CAPST
2
external capacitor connection for startup oscillator
CAPTI
3
external capacitor connection for timing
GND
4
ground supply for the FET driver stage
PWMOUT
5
FET driver stage output
V
SUP
6
positive supply for the FET driver stage
PWM_IN
7
FET driver stage input
RESET
8
reset input
MOT3
9
driver output 3
NC
10,11,12
not connected
MOT0
13
input from the star point of the motor coils
GND1
14
ground (0 V) motor supply return for output stages
MOT1
15
driver output 1
TEST
16
test input/output
NC
17,18,19,20
not connected
MOT2
21
driver output 2
VMOT
22
input voltage for the output driver stages
BRAKE
23
brake input
DIR
24
direction control input
FG
25
frequency generator: output of the rotation speed and position detector stages (open collector digi-
tal output, negative going edge is valid)
GND2
26
ground supply return for control circuits
V
P
27
positive supply voltage
CAPCDM
28
external capacitor connection for adaptive commutation delay timing
NOTE:
1. Pins 10,11,12,17,18,19 have to be connected to the ground for higher dissipation
SL01520
1
2
3
4
5
6
7
8
9
10
11
12
17
18
19
20
21
22
23
24
25
26
27
28
CAPCDS
CAPST
CAPTI
GND
PWMOUT
V
SUP
PWM_IN
RESET
MOT3
NC
NC
CAPCDM
V
P
GND2
FG
DIR
BRAKE
V
MOT
NC
MOT2
NC
NC
NC
NC
13
16 TEST
MOT0
14
15 MOT1
GND1
Figure 2. Pin configuration
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
5
FUNCTIONAL DESCRIPTION
The TDA5146T offers a sensorless three phase motor drive function. It is unique in its combination of sensorless motor drive and fullwave
drive.
The TDA5146T 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 TDA5146T offers the following features:
Sensorless commutation by using the motor EMF
Builtin startup circuit
Optimum commutation, independent of motor type or motor loading
Builtin flyback diodes
Three phase fullwave drive
High output current (1.8 A)
Outputs protected by current limiting and thermal protection of each output transistor
Low current consumption by adaptive basedrive
Soft switching pulse output for low radiation.
Accurate frequency generator (FG) by using the motor BMF
Direction of rotation controlled by one pin.
FET driver stage to be used in a buck converter
LIMITING VALUES
In accordance with the Absolute Maximum System (IEC 134).
Symbol
Parameter
Min
Max
Unit
V
P
, V
sup
Supply voltage
18
V
V
I
Input voltage; all pins except VMOT (V
I
<18 V)
0.3
V
P
+0.5
V
V
VMOT
V
VMOT
input voltage
0.5
17
V
V
O
Output voltage; PWM_OUT and PG/FG
GND
V
P
V
V
O
Output voltage MOT0, MOT1, MOT2 and MOT3
1
V
VMOT
+ V
D
V
V
I
Input voltage CAPST, CAPTI, CAPCD and CAPDC
2.5
V
T
stg
Storage temperature range
55
+150
C
T
amb
Operating ambient temperature range
0
70
C
P
tot
Total power dissipation
HANDLING
Every pin withstands the ESD test according to MILSTD883C cross 1. Method 3015 (HBM 1500
W
, 100 pF 3 pulses + and 3 pulses on each
pin referenced to ground.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
6
SL01519
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
10
20
30
40
50
60
70
P
tot
(H)
T
amb
(o)
Figure 3. Power derating curve (SOT136-1)
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
7
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 range
note 1
4
18
V
I
P
Input current range
note 2
5.9
7.5
mA
V
VMOT
Input voltage to the driver output
stages range
see Figure 1
1.7
16
V
IVsup
Vsup current range
Vsup = 12 V
1.2
2.0
mA
Thermal protection
T
SD
Local temperature at temperature
sensor causing shutdown
130
140
150
C
D
T
Reduction in temperature
before switchon
after shutdown
TSD30
C
MOT0 CENTER TAPE
V
I
Input voltage range
0.5
V
VMOT
V
I
I
Input bias current
0.5 V<V
I
<VMOT1.5 V
10
m
A
V
CSW
Comparator Switching Level
note 3
20
25
30
mV
D
V
CS
Variation in threshold voltage be-
tween comparators
note 3
3
mV
V
H
Comparator input hysteresis
75
m
V
MOT1, MOT2
AND MOT3
V
DO
Dropout Voltage
IO = 100 mA
IO =1000 mA
0.9
1.6
1.05
1.85
V
D
V
OL
Variation in saturation voltage be-
tween lower transistors
IO = 100 mA
180
mV
D
V
OH
Variation in saturation voltage be-
tween upper transistors
IO = 100 mA
180
mV
I
LIM
Current limiting
V
VMOT
=10V
Rout=1.2
W
1.8
2.0
2.5
A
Tr
Rise time switching output
VMOT=15V note 6
5
10
15
m
s
TF
Fall time switching output
VMOT=15V note 6
10
15
20
m
s
V
DHF
Diode forward voltage (D
H
)
notes 4 and 5;
see Fig. 1;
I
0
= 500 mA
1.5
V
V
DLF
Diode forward voltage (D
L
)
notes 4 and 5;
see Fig. 1;
I
0
= 500 mA
1.5
V
I
DM
Peak diode current
note 5
2.5
A
DIR
V
IH
Normal rotation voltage on pin 5
4V< V
P
<18V
2.0
V
V
IL
Reverse rotation voltage on pin 5
4V<V
P
<18V
0.8
V
I
IL
Reverse rotation current
20
m
A
I
IH
Normal rotation current
20
m
A
RESET
V
IH
Input voltage HIGH in reset mode
4V< V
P
<18V
2.0
V
V
IL
Input voltage LOW in normal mode
4V<V
P
<18V
0.8
V
I
IH
Input current HIGH
V
I
= 2.0 V
20
m
A
I
IL
Input current LOW
V
I
= 0.8V
20
m
A
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
8
Symbol
Unit
Max
Typ
Min
Conditions
Parameter
BRAKE
V
IH
Input voltage HIGH in brake mode
4V< V
P
<18V
2.0
V
V
IL
Input voltage LOW in normal mode
4V<V
P
<18V
0.8
V
I
IH
Input current HIGH
V
I
= 2.0 V
20
m
A
I
IL
Input current LOW
V
I
= 0.8 V
20
m
A
FG
V
OL
Output voltage LOW
I
O
=1.6 mA
0.4
V
V
OHmax
Maximum output voltage HIGH
V
P
V
t
THL
Transition time
HIGHtoLOW
C
L
= 50 pF
R
L
= 10 k
W
0.5
m
S
Ratio of FG frequency and
commutation frequency
1:2
d
Duty factor
50
%
PWM_IN
V
IH
High Level Input
4V <V
P
< 18V
2.0
V
V
IL
Low Level Input
4V <V
P
<18V
0.8
V
I
IH
High Level Input Current
V
I
=2.0V
3
0
3
m
A
I
IL
Low Level Input Current
V
I
=0.8V
20
3
m
A
PWMOUT
V
0H
PWM Output HIGH
PWM IN
<=2.0V
Vsup
0.7
V
V
OL
PWM Output LOW
PWM IN
>0.8V
0.7
V
I
pwmoutsource
Sourcing capability
PWMOUT=
10
9.5V
9V
5
15
30
mA
mA
mA
I
pwmoutsink
sinking capability
PWMOUT=1V
25
mA
SR
PWM Output Slew Rate
Rs=51
W
C1=2nF
100
V/
m
S
CAPST
I
I
Output sink current
1.6
2.1
2.6
m
A
I
O
Output source current
2.6
2.1
1.6
m
A
V
SWL
Lower switching level
0.20
V
V
SWM
Middle switching level
0.30
V
V
SWH
Upper switching level
2.20
V
CAPTI
I
I
Output sink current
28
m
A
I
OH
Output source current HIGH
57
m
A
I
OL
Lower source current LOW
5
m
A
V
SWL
Lower switching level
50
mV
V
SWM
Middle switching level
0.30
V
V
SWH
Upper switching level
2.20
V
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
9
Symbol
Unit
Max
Typ
Min
Conditions
Parameter
CAPCDM
l
I
Output sink current
10.6
16.2
22
m
A
I
O
Output source current
5.3
8.1
11
m
A
I
I
/I
O
Ratio of sink to source current
1.85
2.05
2.25
V
IL
Input voltage level LOW
0.85
0.9
V
V
IH
Input voltage level HIGH
2.3
2.4
2.55
V
CAPCDS
I
I
Output sink current
10.1
15.5
20.9
m
A
I
O
Output source current
20.9
15.5
10.1
m
A
I
I
/I
O
Ratio of sink to source current
0.9
1.025
1.15
m
A
V
IL
Input voltage level LOW
0.85
0.9
V
V
IH
Input voltage level HIGH
2.3
2.4
2.55
V
NOTES:
1. An unstabilized supply can be used.
2. V
MOT
= V
P
, all other inputs at 0V; all outputs at V
P
and I
O
= 0mA.
3. Switching levels with respect to MOT1, MOT2 and MOT3. See Figure 4.
4. Drivers are in high impedance OFFstate.
5. The outputs are shortcircuit protected by limiting the current and the IC temperature.
6. Output transition time measurement. See Figure 5.
Hysteresis 75 mV typ
MOT 1 MOT 2 and MOT 3
Comparators threshold voltage
Figure 4.
12.5 V
12.5 V
2V
2V
Tr
Tf
Figure 5.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
10
1. Value selected for 3 HZ startup oscillator frequency
Figure 6. Application diagram without use of the FET driver stage
APPLICATION INFORMATION
Introduction
Fullwave driving of a three phase motor requires three pushpull output stages. In each of the six possible states two outputs are active, one
sourcing and one sinking current. The third output presents a high impedance to the motor which enables measurement of the motor 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 zerocrossing in the motor EMF (detected by the comparator selected by the commutation logic) is used to calculate the correct moment
for the neat 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 zerocrossings can be used to provide speed information such as the tacho signal FG.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
11
SL01521
COMMUTATION
LOGIC
START-UP
OSCILLATOR
TIMING
THERMAL
PROTECTION
DIVIDE
BY 2
ADAPTIVE
COMMUTATION
DELAY
DIRECTION
CONTROL
BRAKE
RESET
BRAKE
RESET
EMF COMPARATORS
MOTOR
ROTATION
SPEED/
DETECTOR
OUTPUT
STAGE
4.7
k
W
+5 V
TEST
10 nF
18 nF
18 nF
220 nF
FG to
micro
processor
DIR
FET DRIVER
STAGE
PWM_IN
PWMOUT
MOSFET P
128
m
H
8.1
m
F 100
m
F
100
m
F
+
+
+
SCHOTTKY
+12 V
TDA5146T
VSUP
Figure 7. Typical Application diagram of the TDA5146T with use of the FET driver stage
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
12
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 zerocrossings 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 TDA5146T is designed for systems with low current consumption: use of I
2
L logic, adaptive base drive for the output transistors (patent
pending).
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
Three external, damping RCcombinations that can be used to reduce BF interference and acoustic noise from the motor
The Start Capacitors (CAPST)
This capacitor determines the frequency of the start oscillator. It is charged and discharged, with a current of 2
m
A, from 0.05 V 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
m
F)
The start oscillator is reset by a commutation pulse and so is only active when the system is in the startup 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
TDA5146T 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:
f
OSC
+
(0.5
p
)
(K
t
I
p J)
1 2
where: K
t
= torque constant (N.m/A)
I = current (A)
p = number of magnetic polepairs
J = inertia J (kg/m
2
)
Example: J = 72
10
6
kg/M
2
, K = 25
10
3
N.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
m
F, (choose 220 nF).
The Adaptive Commutation Delay (CAPCDM and CAPCDS)
In this circuit capacitor CAPCDM is charged during one commutation period, with an interruption of the charging current during the diode pulse.
During the next commutation period this capacitor (CAPCDM) is discharged at twice the charging current. The charging current is 8.1
m
A and
the discharging current 16.2
m
A ; the voltage range is from 0.9 to 2.2V. The voltage must stay within this range at the lowest commutation
frequency of interest, f
c1
:
C=8.1
6
/ f
1.3=6231/f
C1
(C in nF)
If the frequency is lower, then a constant commutation delay after the zerocrossing is generated by the discharge from 2.2 to 0.9V at 16.2
m
A.
maximum delay = (0.076 x C) ms
(with C in nF)
Example: nominal commutation frequency = 900 Hz and the lowest usable frequency = 400 Hz, so:
CAPCDM = 6231 / 400 = 15.6
(choose 18 nF)
The other capacitor, CAPCDS, is used to repeat the same delay by charging and discharging with 20
m
A. The same value can be chosen as
for CAPCDM. Figure 8 illustrates typical voltage waveforms.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
13
SL01522
voltage
on CAP-CDS
voltage
on CAP-CDM
Figure 8. CAP-CDM and CAP-CDS voltage waveform in normal running mode
The Timing Capacitor (CAPTI)
Capacitor CAPTI 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 diodepulse 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 mining 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
m
A, from 0.2 to 0.3V. Above this level it is charged, with a current of 5
m
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
m
A. The watchdog time is the time taken to charge the capacitor, with a current of 5
m
A, from 0.3 to 2.2V. The
value of CAPT1 is given by:
C=5
10
6
t
m
/1.92.63 t
m
(C in nF; t in ms)
Example: If after switching off, the voltage from a motor winding is reduced, in 3.5 ms, to within 20 mv (the offset of the EMF comparator), then
the value of the required timing capacitor is given by:
C = 2.63
3.5 = 9.2
(choose 10 nF)
Typical voltage waveforms are illustrated by Figure 9.
SL01523
VOLTAGE
ON CAPTI
VMOT1
Figure 9. Typical CapTI and VMOT1 voltage waveforms in normal running mode
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
14
NOTE:
1. If the chosen value of CAPTI is too small, then 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).
The External Damping Components
Flyback pulses from the motor windings may cause H F interference and acoustic noise. The flyback pulses can be damped by
RCcombinations in parallel with the motor windings. This reduces the HF interference; it also reduces the acoustic noise by several dB,
depending on the motor construction.
These damping components also have negative effects. They not only dissipate energy from the flyback pulses, but also contribute to the
overall energy consumption. Other negative effects are discussed below.
One negative effect is the distortion of the motor EMF sensed by the comparators in the TDA5146T. This distortion may influence the correct
functioning of the TDA5146T, for example, an (damped) oscillation occurring after the winding has been switched off. This oscillation must be
critically (or over critically) damped, so that:
R
2
C = 4
L (L = inductance of one coil, R and C for damping)
A second requirement is that the effect of the damping components must be negligible by the time that the zerocrossing of the EMF is
expected. This is because the remainder of the step (due to RC components) causes shifting of the zerocrossing. For a critically damped
combination the voltage can be calculated as a negative exponential with
ws
t.
Example: Commutation frequency = 900 Hz, so t = 1100
m
s, the time taken from the end of the diode pulse to the zerocrossing of the EMF will
be approximately t = 440
m
s. If a damping voltage from 9 V to 3 mV is required, then the reduction is 3000fold, or e exp8 = e exp
ws
t.
This gives
ws
= 18180 rad/s. With L = 3 mH, C is found to be 1.01
m
F (use 1
m
F) and R is found to be 109.1
W
(use 100
W
).
A motor voltage of 7 V (peaktopeak) at 150 Hz gives 3300 V/s, thus a 3 mV remainder shifts the zerocrossing 1
m
s. Eddy currents will also
contribute to this phase shift. A shift of 20
m
s corresponds with 0.18 degrees (mechanically) for a 1500 rpm motor, or 0.1 mm on a VHS scanner
drum.
Other Design Aspects
There are other design aspects concerning the application of the TDA5146T besides the commutation function. They are:
Generation of the tacho signal FG
Possibilities of motor control
Preposition input
Direction input
Brake input
Reliability
FG Signal
The FG signal is generated in the TDA5146T by using the zerocrossing of the motor EMF from the three motor windings. Every zerocrossing
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 zerocrossing (except for PG). The negativegoing edges are called FG pulses because they generate an
interrupt in a controlling microprocessor.
The accuracy of the FG output signal (jitter) is very good. This accuracy depends on the symmetry of the motor's electromagnetic construction,
which also effects the satisfactory functioning of the motor itself.
Example: A three phase motor with 6 magnetic polepairs at 1500 rpm and with a fullwave drive has a commutation frequency of 25
6
6
= 900 Hz, and generates a tacho signal of 450 Hz.
DIRECTION Input
If the voltage on pin 24 is less than 0.8 V, the motor is running in one direction (depending of the motor connections). If the voltage on pin 24 is
higher than 2.0V, the motor is running in the other direction.
BRAKE function
If the voltage on pin 23 is higher than 2.0V , the motor brakes. In that condition, the 3 outputs MOT1, MOT2, and MOT3 are forced at a low level
and the current limitation is done internally by the sink drivers.
TEST function
It is possible to turn off the three outputs by forcing in pin 16 a current of 600
m
A.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
15
SL01524
R = ((V
P
0.4) .10
e4
) /6
TEST
V
P
Figure 10.
RESET function
If the voltage on pin 8 is higher than 2.0V, the output states are:
MOT 1 Float
MOT 2 Low
MOT 3 High
SWITCHING SEQUENCE AFTER A RESET PULSE
DIR
RESET
MOT1
MOT2
MOT3
FUNCTION
H
H
F
L
H
Reset
H
L
F
L
H
Normal direction mode sequence
H
L
H
L
F
H
L
H
F
L
H
L
F
H
L
H
L
L
H
F
H
L
L
F
H
L
H
H
L
F
Reset
L
L
H
L
F
Reverse direction mode sequence
L
L
F
L
H
L
L
L
F
H
L
L
L
H
F
L
L
F
H
L
L
L
H
F
L
PRIORITY OF FUNCTION
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
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.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
16
SOLDERING
Plastic minipacks
BY WAVE
During placement and before soldering, the component must be fixed with a droplet of adhesive. After cutting the adhesive, the component can
be soldered. The adhesive can be applied by screen printing, pin transfer or syringe dispending.
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 (dualwave), 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.
BY 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 pressuresyringe dispending before device placement.
Several techniques exist for reflowing; for example, thermal conduction by heated belt, infrared and vaporphase 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.
REPAIRING SOLDERED JOINTS (BY HANDHELD SOLDERING IRON OR PULSEHEATED 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 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. Pulseheated soldering is not recommended for SO packages.
For pulseheated 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 inline 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 printedcircuit board has been preheated, forced cooling may be necessary immediately after soldering to keep the temperature within the
permissible limit.
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
17
SO28:
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
Philips Semiconductors
Product specification
TDA5146T
Brushless DC motor drive circuit
1994 May 18
18
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For
detailed information see the relevant data sheet or data handbook.
Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). 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 -- Applications that are described herein for any of these products are for illustrative purposes only. Philips
Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or
modification.
Disclaimers
Life support -- 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 Semiconductors customers using or selling these products for use in such applications
do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application.
Right to make changes -- Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard
cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no
responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless
otherwise specified.
Contact information
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Koninklijke Philips Electronics N.V. 1994
All rights reserved. Printed in U.S.A.
Date of release: 05-94
Document order number:
9397 750 08834
Philips
Semiconductors
Data sheet status
[1]
Objective
specification
Preliminary
specification
Product
specification
Product
status
[2]
Development
Qualification
Production
Definitions
This data sheet contains data from the objective specification for product development.
Philips Semiconductors reserves the right to change the specification in any manner without notice.
This data sheet contains data from the preliminary specification. Supplementary data will be
published at a later date. Philips Semiconductors reserves the right to change the specification
without notice, in order to improve the design and supply the best possible product.
This data sheet contains data from the product specification. Philips Semiconductors reserves the
right to make changes at any time in order to improve the design, manufacturing and supply.
Changes will be communicated according to the Customer Product/Process Change Notification
(CPCN) procedure SNW-SQ-650A.
Data sheet status
[1] Please consult the most recently issued data sheet before initiating or completing a design.
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL
http://www.semiconductors.philips.com.
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