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PDF TDA5142T Data sheet ( Hoja de datos )
| Número de pieza | TDA5142T | |
| Descripción | Brushless DC motor drive circuit | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA5142T
Brushless DC motor drive circuit
Product specification
Supersedes data of March 1992
File under Integrated Circuits, IC11
June 1994
Philips Semiconductors
1 page  
Philips Semiconductors
Brushless DC motor drive circuit
Product specification
TDA5142T
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
The TDA5142T offers a sensorless three phase motor
drive function. It is unique in its combination of sensorless
motor drive and full-wave drive. The TDA5142T offers
protected outputs capable of driving external power FETs
or bipolar power transistors. It can easily be adapted for
different motors and applications. The TDA5142T 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.
• Six output drivers.
• Maximum output current 0.25 A.
• Outputs protected by current limiting and thermal
protection.
• Low current consumption.
• Accurate frequency generator (FG) by using the
motor EMF.
• Brake function.
• Uncommitted operational transconductance amplifier
(OTA), with a high output current, for use as a control
amplifier or as a level shifter in a Switched Mode Power
Supply (SMPS) drive.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
VP
VI
VVMOT
VO
VI
Tstg
Tamb
Ptot
Ves
PARAMETER
CONDITIONS
supply voltage
input voltage; all pins except
VMOT
VI < 18 V
VMOT input voltage
output voltage
FG
AMP OUT
OUT-NA, OUT-NB and OUT-NC
OUT-PA, OUT-PB and OUT-PC
input voltage CAP-ST, CAP-TI,
CAP-CD and CAP-DC
storage temperature
operating ambient temperature
total power dissipation
see Fig.3
electrostatic handling
see Chapter “Handling”
MIN.
4
−0.3
3
GND
−
−
0.2
−
−55
0
−
−
MAX.
18
VP + 0.5
18
UNIT
V
V
V
VP
18
VVMOT − 0.9
−
2.5
V
V
V
V
V
+150
+70
−
500
°C
°C
W
V
June 1994
5
5 Page 
Philips Semiconductors
Brushless DC motor drive circuit
Product specification
TDA5142T
Introduction (see Fig.6)
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 external
connected output transistors has been depicted and the
corresponding output levels on the NA, PA, NB, PB, NC
and PC outputs of the TDA5142T.
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 also 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 TDA5142T 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 TDA5142T 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.
THE START CAPACITOR (CAP-ST)
This capacitor determines the frequency of the start
oscillator. It is charged and discharged, with a current of
2 µA, from 0.05 to 2.2 V and back to 0.05 V. The time
taken to complete one cycle is given by:
tstart = (2.15 × C) s (with C in µF)
The start oscillator is reset by a commutation pulse and so
is only active when the system is in the start-up mode. A
pulse from the start oscillator will cause the outputs to
change to the next state (torque in the motor).
Table 1 Output states.
STATE MOT1(1)
1Z
2H
3H
4Z
5L
6L
OUT-
NA(1)
L
L
L
L
H
H
OUT-
PA(1)
H
L
L
H
H
H
MOT2(1)
L
L
Z
H
H
Z
OUT-
NB(1)
H
H
L
L
L
L
Note
1. H = HIGH state; L = LOW state; Z = high-impedance OFF-state.
OUT-
PB(1)
H
H
H
L
L
H
MOT3(1)
H
Z
L
L
Z
H
OUT-
NC(1)
L
L
H
H
L
L
OUT-
PC(1)
L
H
H
H
H
L
June 1994
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TDA5142T.PDF ] | |
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