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TDA5144 Datasheet(PDF) 11 Page - NXP Semiconductors

Part No. TDA5144
Description  Brushless DC motor drive circuit
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 11 page
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June 1994
11
Philips Semiconductors
Product specification
Brushless DC motor drive circuit
TDA5144
The oscillation of the motor is given by:
where:
Kt = torque constant (N.m/A)
I = current (A)
p = number of magnetic pole-pairs
J = inertia J (kg.m2)
Example: J = 72
× 10−6 kg.m2, K = 25 × 10−3 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 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:
(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.
f
osc
1
2
π
K
t
I
×
p
×
J
-----------------------
-----------------------------------
=
C
8.1
10
6
×
f1.3
×
--------------------------
6231
f
C1
-------------
==
CAP-CD
6231
400
-------------
15.6
==




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