Document Outline
- FEATURES
- APPLICATIONS
- GENERAL DESCRIPTION
- QUICK REFERENCE DATA
- ORDERING INFORMATION
- BLOCK DIAGRAM
- PINNING
- FUNCTIONAL DESCRIPTION
- Introduction
- Start-up and commutation control
- Miscellaneous functions
- LIMITING VALUES
- HANDLING
- QUALITY SPECIFICATION
- CHARACTERISTICS
- APPLICATION INFORMATION
- PACKAGE OUTLINE
- SOLDERING
- DEFINITIONS
- LIFE SUPPORT APPLICATIONS
DATA SHEET
Preliminary specification
Supersedes data of 1997 Apr 23
File under Integrated Circuits, IC11
1997 Sep 12
INTEGRATED CIRCUITS
TDF5242T
Brushless DC motor drive circuit
1997 Sep 12
2
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
FEATURES
Full-wave commutation without position sensors
Built-in start-up circuitry
Six outputs that can drive three external transistor pairs:
output current 0.2 A (typ.)
low saturation voltage
built-in current limiter
Thermal protection
Tacho output without extra sensor
Transconductance amplifier for an external control
transistor
Brake control input
Direction control input.
APPLICATIONS
High-power applications, for instance:
high-end hard disk drives
automotive applications.
GENERAL DESCRIPTION
The TDF5242T is a bipolar integrated circuit for driving
3-phase brushless DC motors in full-wave mode.
The device functions sensorless, thus saving 3 hall-effect
sensors, using the back-EMF (Electro Motive Force)
sensing technique to sense the rotor position. It includes
6 pre-drivers able to control external FETs (Field Effect
Transistors) or bipolar transistors. It offers brake and
direction control. It is ideally suited for high-power
applications such as high-end hard disk drives and
automotive applications.
QUICK REFERENCE DATA
Measured over full voltage and temperature range.
Note
1. An unstabilized supply can be used.
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
3
-
18
V
V
O
driver output voltage
I
O
= 100 mA; lower transistor
-
-
0.35
V
I
O
= 100 mA; upper transistor
1.05
-
-
V
I
LIM
current limiting
V
VMOT
= 14.5 V; R
O
= 47
150
200
250
mA
TYPE
NUMBER
PACKAGE
NUMBER
DESCRIPTION
VERSION
TDF5242T
SO28
plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
1997 Sep 12
3
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
MGG988
TRANS-
CONDUCTANCE
AMPLIFIER
START-UP
OSCILLATOR
ADAPTIVE
COMMUTATION
DELAY
ROTATION
SPEED
AND
DETECTOR
OUTPUT
STAGE
TIMING
COMMUTATION
LOGIC
THERMAL
PROTECTION
OUTPUT DRIVER
STAGE
OUTPUT DRIVER
STAGE
OUTPUT DRIVER
STAGE
OUTPUT DRIVER
STAGE
OUTPUT DRIVER
STAGE
EMF COMPARATORS
DIRECTION
LOGIC
TDF5242T
BRAKE
LOGIC
19
21
6
20
16
15
14
8
18
10
7
DIR
BRAKE
GND2 GND1
VP
9
11
3
26
24
23
22
5
4
2
1
28
27
13
MOT0
COMP-C
COMP-B
COMP-A
OUT-NC
OUT-PC
OUT-PB
OUT-NB
OUT-PA
OUT-NA
OUTPUT DRIVER STAGE
AMP OUT
VMOT
+
AMP IN
-
AMP IN
CAP-ST
CAP-DC
CAP-CD
TEST
CAP-TI
FG
n.c.
12, 17, 25
1997 Sep 12
4
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
PINNING
SYMBOL
PIN
DESCRIPTION
OUT-NB
1
driver output B for driving the
n-channel power FET or power NPN
OUT-PB
2
driver output B for driving the
p-channel power FET or power PNP
GND1
3
ground (0 V) motor supply return for
output stages
OUT-PC
4
driver output C for driving the
p-channel power FET or power PNP
OUT-NC
5
driver output C for driving the
n-channel power FET or power NPN
VMOT
6
input voltage for the output driver
stages
DIR
7
direction input command
TEST
8
test input/output
BRAKE
9
brake input
FG
10
frequency generator: output of the
rotation speed detector stage
GND2
11
ground supply return for control
circuits
n.c.
12
not connected
V
P
13
supply voltage
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
n.c.
17
not connected
CAP-TI
18
external capacitor connection for
timing
+AMP IN
19
non-inverting input of the
transconductance amplifier
-
AMP IN
20
inverting input of the
transconductance amplifier
AMP OUT
21
transconductance amplifier output
(open collector)
COMP-A
22
comparator input corresponding to
output A
COMP-B
23
comparator input corresponding to
output B
COMP-C
24
comparator input corresponding to
output C
n.c.
25
not connected
MOT0
26
input from the star point of the motor
coils
OUT-NA
27
driver output A for driving the
n-channel power FET or power NPN
OUT-PA
28
driver output A for driving the
p-channel power FET or power PNP
SYMBOL
PIN
DESCRIPTION
Fig.2 Pin configuration.
handbook, halfpage
OUT-NB
OUT-PB
GND1
OUT-PC
OUT-NC
VMOT
DIR
TEST
BRAKE
FG
GND2
n.c.
VP
CAP-CD
OUT-PA
OUT-NA
MOT0
n.c.
COMP-B
COMP-A
COMP-C
AMP OUT
-
AMP IN
+
AMP IN
CAP-TI
n.c.
CAP-ST
CAP-DC
1
2
3
4
5
6
7
8
9
10
11
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
TDA5242T
MGG987
1997 Sep 12
5
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
FUNCTIONAL DESCRIPTION
Introduction
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 (Electro Motive Force) 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 six possible states of the
externally connected output transistors have been
depicted and the corresponding output levels on the NA,
PA, NB, PB, NC and PC outputs of the TDF5242T.
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.
The output stages are protected by a current limiting circuit
and by thermal protection.
The detected zero-crossings are used to provide speed
information. The information has been made available on
the FG output pin. This output provides an output signal
with a frequency equal to 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.
A timing function is incorporated into the device for internal
timing and for timing of the reverse rotation detection.
The TDF5242T 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 TDF5242T is designed for systems with low current
consumption. It uses I
2
L logic and adaptive base drive for
the output transistors (patented).
Start-up and commutation control
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.
Table 1
Output states (note 1)
Note
1. H = HIGH state; L = LOW state; Z = high-impedance OFF-state.
DIR
STATE
MOT1
OUT-NA
OUT-PA
MOT2
OUT-NB
OUT-PB
MOT3
OUT-NC
OUT-PC
H
1
Z
L
H
L
H
H
H
L
L
H
2
H
L
L
L
H
H
Z
L
H
H
3
H
L
L
Z
L
H
L
H
H
H
4
Z
L
H
H
L
L
L
H
H
H
5
L
H
H
H
L
L
Z
L
H
H
6
L
H
H
Z
L
H
H
L
L
L
1
Z
L
H
L
H
H
H
L
L
L
2
L
H
H
Z
L
H
H
L
L
L
3
L
H
H
H
L
L
Z
L
H
L
4
Z
L
H
H
L
L
L
H
H
L
5
H
L
L
Z
L
H
L
H
H
L
6
H
L
L
L
H
H
Z
L
H
1997 Sep 12
6
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
S
TART 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 to
complete one cycle is:
(1)
The start oscillator is reset by a commutation pulse and 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. If the movement of the motor
generates enough EMF, the TDF5242T 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 start capacitor should be chosen to meet
this requirement.
The oscillation frequency of the motor is given by:
where:
K
t
= torque constant (Nm/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg.m
2
).
t
start
2.15
C
(
)
s (with C in
F
)
=
f
osc
1
2
K
t
I
p
J
-----------------------
-----------------------------------
=
Example: J = 72
10
-
6
kg.m
2
, K = 25
10
-
3
Nm/A, p = 6
and I = 0.5 A; this gives f
osc
= 5 Hz. If the damping is high,
a start frequency of 2 Hz can be chosen or t = 500 ms,
thus, according to equation (1): C = 0.5/2.15 = 0.23
F
(choose 220 nF).
A
DAPTIVE COMMUTATION DELAY
(CAP-CD
AND
CAP-DC)
In this circuit the 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 the capacitor 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 commutation frequency is lower, a constant
commutation delay after the zero-crossing is generated by
the discharge from 2.2 down 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; so:
(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 3 illustrates
typical voltage waveforms.
C
8.1
10
6
f
1.3
--------------------------
6231
f
C1
-------------
=
=
CAP-CD
6231
400
-------------
15.6
=
=
handbook, full pagewidth
t
MGG993
Vmax = VIH
VIL
voltage
on CAP-CD
voltage
on CAP-DC
COM
COM
(1)
ZCR
ZCR
(2)
ZCR
ZCR
ZCR
ZCR
COM
COM
COM
COM
Fig.3 CAP-CD and CAP-DC typical voltage waveforms in normal running mode.
(1) COM = commutation.
(2) ZCR = zero-crossing.
1997 Sep 12
7
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
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 (<<1 ms). However, if the motor is
motionless or rotating in the reverse direction, the time can
be longer (>>1 ms).
A watchdog time must be chosen such that it is long
enough for a motor without detectable EMF, 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 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.4.
Miscellaneous functions
In addition to start-up and commutation control, the
TDF5242T provides the following functions:
Generation of the tacho signal FG
General purpose Operational Transconductance
Amplifier (OTA)
Possibilities of motor control
Direction function and brake function
High current and temperature protection.
T
HE
O
PERATIONAL
T
RANSCONDUCTANCE
A
MPLIFIER
(OTA)
The OTA is an uncommitted amplifier with a high output
current (40 mA) that can be used as a control amplifier or
as a level converter in a Switched Mode Power Supply
(SMPS). The common mode input range includes ground
(GND) and rises to V
P
-
1.7 V. The high sink current
enables the OTA to drive a power transistor directly in an
analog control amplifier or in a SMPS driver.
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 is
provided.
Fig.4 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
MGG994
VSWH
VMOT1
voltage
on CAP-TI
VSWM
VSWL
1997 Sep 12
8
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
The convention for the inputs (inverting or not) is the same
as for a normal operational amplifier: with a resistor (as a
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). Note that a `plus' input
causes less current, and consequently a positive voltage.
M
OTOR
C
ONTROL
DC motors can also be operated with analog control 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).
FG
SIGNAL
The FG (Frequency Generator) signal is generated in the
TDF5242T by using the zero-crossing of the motor EMF
from the three motor windings and the commutation signal.
Output FG switches from HIGH-to-LOW on all zero
crossings and from LOW-to-HIGH on all commutations.
Output FG can source typically 75
A and sink more
than 3 mA.
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 900 Hz.
D
IRECTION FUNCTION
If the voltage on pin 7 is <2.3 V the motor is running in
one direction (depending on the motor connections)
If pin 7 is floating or the voltage is >2.7 V the motor is
running in the other direction.
B
RAKE FUNCTION
If the voltage on pin 9 (pin BRAKE) is <2.3 V the motor
brakes; in this condition the external outputs are driven
to a HIGH voltage level
If pin 9 is floating or the voltage is >2.7 V the motor
runs normally.
R
ELIABILITY
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 in such a way that the transistors are switched
off when the junction temperature becomes too high.
1997 Sep 12
9
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
V
P
supply voltage
4
18
V
V
I
input voltage; all pins except
VMOT, CAP-ST, CAP-TI, CAP-CD
and CAP-DC
V
I
< 18 V
-
0.3
V
P
+ 0.5
V
V
VMOT
VMOT input voltage
3
18
V
V
O
output voltage
FG
GND
V
P
V
AMP OUT
-
18
V
OUT-NA, OUT-NB and OUT-NC
-
V
VMOT
-
0.9 V
OUT-PA, OUT-PB and OUT-PC
0.2
-
V
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
-
40
+85
C
P
tot
total power dissipation
see Fig.5
-
-
V
es
electrostatic handling
see Chapter "Handling"
-
500
V
Fig.5 Power derating curve.
handbook, halfpage
-
50
0
200
3
2
0
1
50
100
150
MGG989
Tamb (
C)
Ptot
(W)
HANDLING
Every pin withstands the ESD test according to
"MIL-STD-883C class 2". Method 3015 (HBM 1500
,
100 pF) 3 pulses + and 3 pulses
-
on each pin referenced
to ground.
QUALITY SPECIFICATION
In accordance with
"SNW-FQ-611-E". The number of the
quality specification can be found in the
"Quality
Reference Handbook". The handbook can be ordered
using the code 9397 750 00192.
1997 Sep 12
10
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
CHARACTERISTICS
V
P
= 14.5 V
10%; T
amb
=
-
40 to +85
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
-
5.2
6.25
mA
V
VMOT
input voltage to the output driver
stages
see Fig.1
3
-
18
V
Thermal protection
T
SD
temperature at temperature sensor
causing shut-down
130
140
150
C
T
decrease in temperature before
switch-on after shut-down
-
T
SD
-
30
-
K
COMP-A, COMP-B, COMP-C and MOT0
V
I
input voltage
-
0.5
-
V
VMOT
V
I
I
input bias current
0.5 V < V
I
< V
VMOT
-
1.5 V
-
10
-
0
A
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
T
amb
= 25
C
-
75
-
V
OUT-NA, OUT-NB, OUT-NC, OUT-PA, OUT-PB and OUT-PC
V
O(n)
n-channel driver output voltage
upper transistor;
I
O
=
-
100 mA;
T
amb
= 25
C
-
1.05
-
-
V
lower transistor;
I
O
= 10 mA; T
amb
= 25
C
-
-
0.35
V
V
O(p)
p-channel driver output voltage
upper transistor;
I
O
=
-
10 mA; T
amb
= 25
C
-
1.05
-
-
V
lower transistor;
I
O
= 100 mA; T
amb
= 25
C
-
-
0.35
V
V
OL
variation in saturation voltage
between lower transistors
I
O
= 100 mA; T
amb
= 25
C
-
-
180
mV
V
OH
variation in saturation voltage
between upper transistors
I
O
=
-
100 mA;
T
amb
= 25
C
-
-
180
mV
I
LIM
current limiting
lower transistor; R
O
= 47
150
180
250
mA
+AMP IN and
-
AMP IN
V
I
input voltage
-
0.3
-
V
P
-
1.7 V
differential mode voltage without
`latch-up'
-
-
V
P
V
I
b
input bias current
T
amb
= 25
C
-
-
650
nA
C
I
input capacitance
T
amb
= 25
C
-
4
-
pF
V
offset
input offset voltage
-
-
10
mV
1997 Sep 12
11
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
AMP OUT (open collector)
I
sink
output sink current
40
-
-
mA
V
sat
saturation voltage
I
I
= 40 mA
-
1.5
2.1
V
V
O
output voltage
-
0.5
-
+18
V
SR
slew rate
R
L
= 330
; C
L
= 50 pF
40
-
-
mA/
s
g
m(tr)
transfer gain
0.3
-
-
S
DIR
V
IL
LOW level input voltage (reverse
rotation)
reverse mode;
4 V < V
P
< 18 V
-
-
2.3
V
V
IH
HIGH level input voltage (normal
rotation)
normal mode;
4 V < V
P
< 18 V
2.7
-
-
V
I
IL
LOW level input current (reverse
rotation)
reverse mode;
T
amb
= 25
C
-
-
20
-
A
I
IH
HIGH level input current (normal
rotation)
normal mode;
T
amb
= 25
C
-
0
-
A
BRAKE
V
BM
brake-mode voltage
enable brake mode;
4 V < V
P
< 18 V
-
-
2.3
V
normal mode;
4 V < V
P
< 18 V
2.7
-
-
V
I
I
input current
brake mode; T
amb
= 25
C
-
-
20
-
30
A
normal mode;
T
amb
= 25
C
-
0
20
A
FG (push-pull)
V
OL
LOW level output voltage
I
O
= 1.6 mA
-
-
0.4
V
V
OH
HIGH level output voltage
I
O
=
-
60
A
-
V
P
-
0.3
-
V
t
THL
HIGH-to-LOW transition time
T
amb
= 25
C;
C
L
= 50 pF; R
L
= 10 k
-
0.5
-
s
ratio of FG frequency and
commutation frequency
T
amb
= 25
C
-
1
-
CAP-ST
I
sink
output sink current
1.5
2.0
2.5
A
I
source
output source current
-
2.5
-
2.0
-
1.5
A
V
SWL
LOW level switching voltage
T
amb
= 25
C
-
0.20
-
V
V
SWH
HIGH level switching voltage
T
amb
= 25
C
-
2.20
-
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
f
FG
f
comm
--------------
1997 Sep 12
12
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
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 driver outputs OUT-NA, OUT-NB, OUT-NC, OUT-PA, OUT-PB and OUT-PC.
CAP-TI
I
sink
output sink current
20
28
38
A
I
source
output source current
0.2 V < V
CAP-TI
< 0.3 V
-
64
-
57
-
50
A
0.3 V < V
CAP-TI
< 2.2 V
-
6.5
-
5.5
-
4.5
A
V
SWL
LOW level switching voltage
T
amb
= 25
C
-
50
-
mV
V
SWM
MIDDLE level switching voltage
T
amb
= 25
C
-
0.30
-
V
V
SWH
HIGH level switching voltage
T
amb
= 25
C
-
2.20
-
V
CAP-CD
I
sink
output sink current
10.6
16.2
22
A
I
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
T
amb
= 25
C
825
850
875
mV
temperature coefficient of LOW
level input voltage
-
-
1.4
-
mV/K
V
IH
HIGH level input voltage
2.3
-
2.5
V
CAP-DC
I
sink
output sink current
10.1
15.5
20.9
A
I
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
T
amb
= 25
C
825
850
875
mV
temperature coefficient of LOW
level input voltage
-
-
1.4
-
mV/K
V
IH
HIGH level input voltage
2.3
-
2.5
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
IL
T
------------
V
IL
T
------------
1997 Sep 12
13
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
APPLICATION INFORMATION
(1) RX = RY > 8 (VMOT
-
1.5).
Fig.6
Application diagram without use of the Operational Transconductance Amplifier (OTA) with bipolar power
transistors.
handbook, full pagewidth
MGG990
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TDF5242T
1
k
1
k
1
k
330
10
nF
100
nF
18
nF
18
nF
n.c.
n.c.
n.c.
FG
RX
(1)
RY
(1)
RX
(1)
RY
(1)
RX
(1)
RY
(1)
DIR
BRAKE
1
F
VP
VMOT
1
F
1997 Sep 12
14
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
Fig.7 Application diagram without use of the Operational Transconductance Amplifier (OTA) with MOSFETs.
handbook, full pagewidth
MGG991
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TDF5242T
1
k
1
k
1
k
330
10
nF
100
nF
18
nF
18
nF
n.c.
n.c.
n.c.
FG
DIR
BRAKE
1
F
1
F
VP
VMOT
1997 Sep 12
15
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
Fig.8 Application of the TDF5242T as a scanner driver, with the use of the uncommitted on-chip OTA.
handbook, full pagewidth
MGG992
START-UP
OSCILLATOR
ADAPTIVE
COMMUTATION
DELAY
ROTATION
SPEED
AND
DETECTOR
OUTPUT
STAGE
TIMING
COMMUTATION
LOGIC
THERMAL
PROTECTION
OUT-NA
OUT-PB
OUT-NB
OUT-PC
OUT-NC
EMF COMPARATORS
DIRECTION
LOGIC
TDF5242T
BRAKE
LOGIC
21
47 nF
220 nF
18 nF
10 nF
BD434
47 nF
+
14 V
19
6
20
16
15
14
8
18
10
7
DIR
BRAKE
9
26
24
23
22
5
4
1
2
27
OUT-PA
28
TEST
FG to
micro-
controller
n.c.
+
5 V
12, 17, 25
13
3
11
GND2
GND1
18 nF
39 k
47 k
10 k
120
470
680
1
F
from
DAC
1997 Sep 12
16
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
PACKAGE OUTLINE
UNIT
A
max.
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
inches
2.65
0.30
0.10
2.45
2.25
0.49
0.36
0.32
0.23
18.1
17.7
7.6
7.4
1.27
10.65
10.00
1.1
1.0
0.9
0.4
8
0
o
o
0.25
0.1
DIMENSIONS (inch dimensions are derived from the original mm dimensions)
Note
1. Plastic or metal protrusions of 0.15 mm maximum per side are not included.
1.1
0.4
SOT136-1
X
14
28
w
M
A
A
1
A
2
b
p
D
H
E
L
p
Q
detail X
E
Z
c
L
v
M
A
e
15
1
(A )
3
A
y
0.25
075E06
MS-013AE
pin 1 index
0.10
0.012
0.004
0.096
0.089
0.019
0.014
0.013
0.009
0.71
0.69
0.30
0.29
0.050
1.4
0.055
0.419
0.394
0.043
0.039
0.035
0.016
0.01
0.25
0.01
0.004
0.043
0.016
0.01
0
5
10 mm
scale
SO28: plastic small outline package; 28 leads; body width 7.5 mm
SOT136-1
95-01-24
97-05-22
1997 Sep 12
17
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
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
"IC Package Databook" (order code 9398 652 90011).
Reflow soldering
Reflow soldering techniques are suitable for all SO
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 techniques can be used for all SO
packages if the following conditions are 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.
The package footprint must incorporate solder thieves at
the downstream end.
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.
1997 Sep 12
18
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
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.
1997 Sep 12
19
Philips Semiconductors
Preliminary specification
Brushless DC motor drive circuit
TDF5242T
NOTES
Internet: http://www.semiconductors.philips.com
Philips Semiconductors a worldwide company
Philips Electronics N.V. 1997
SCA55
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Printed in The Netherlands
297027/1200/02/pp20
Date of release: 1997 Sep 12
Document order number:
9397 750 02378
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