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Número de pieza TDA5144AT
Descripción Brushless DC motor drive circuit
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INTEGRATED CIRCUITS
DATA SHEET
TDA5144
Brushless DC motor drive circuit
Product specification
Supersedes data of March 1992
File under Integrated Circuits, IC11
June 1994
Philips Semiconductors

1 page




TDA5144AT pdf
Philips Semiconductors
Brushless DC motor drive circuit
Product specification
TDA5144
Fig.2 Pin configuration (SOT163-1; SO20L).
Fig.3 Pin configuration (SOT136-1; SO28L).
FUNCTIONAL DESCRIPTION
The TDA5144 offers a sensorless three phase motor drive
function. It is unique in its combination of sensorless motor
drive and full-wave drive. The TDA5144 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
TDA5144 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.
Uncommitted operational transconductance amplifier
(OTA), with a high output current, for use as a control
amplifier.
June 1994
5

5 Page





TDA5144AT arduino
Philips Semiconductors
Brushless DC motor drive circuit
The oscillation of the motor is given by:
fosc
=
----------------1------------------
2π -K----t---×---J-I---×-----p--
where:
Kt = torque constant (N.m/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg.m2)
Example: J = 72 × 106 kg.m2, K = 25 × 103 N.m/A, p = 6
and I = 0.5 A; this gives fosc = 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 µF (choose 220 nF).
THE 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, fC1:
C = -8---.--1f---×-×----1-1--.--03------6 = 6---f-2-C--3--1--1- (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 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 = 6--4--2--0-3--0--1- = 15.6 (choose 18 nF)
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.
June 1994
11
Product specification
TDA5144

11 Page







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