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PDF TDA5341G Data sheet ( Hoja de datos )
| Número de pieza | TDA5341G | |
| Descripción | Brushless DC motor and VCM drive circuit with speed control | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA5341
Brushless DC motor and VCM drive
circuit with speed control
Product specification
File under Integrated Circuits, IC11
1997 Jul 10
1 page  
Philips Semiconductors
Brushless DC motor and VCM drive circuit
with speed control
Product specification
TDA5341
SYMBOL
VDDD
ENABLE
RESETOUT
UVDIN1
VCM−
BRAKEDELAY
TP2
ROSC
VEE4
VEED
SENSEIN−
SENSEN+
SENSEOUT
UVDIN2
VEE2
TP3
RESET
FMOT
CAPXB
MOT1
CAPXA
CAPYA
CAPYB
VDD2
PIN DESCRIPTION
41 digital power supply
42 enable input; enables the serial port, i.e. allows DATA to be shifted in (active LOW)
43 under-voltage detector output flag (active LOW)
44 external capacitor for the RESETOUT duration
45 negative output of the VCM amplifier
46 delay control input for brake after park
47 test purpose 2 (should be left open-circuit)
48 reference oscillator input for motor speed control
49 ground 4 for the actuator driver
50 digital ground
51 inverting input of the VCM sense amplifier
52 non-inverting input of the VCM sense amplifier
53 output of the VCM sense amplifier
54 external voltage reference for the under-voltage detector
55 ground 2 for the spindle motor drivers
56 test purpose 3 (should be left open-circuit)
57 reset input; forces all bits of the SERIALIN register to 0 (active HIGH)
58 tachometer output (one pulse per mechanical revolution)
59 external capacitor for the charge pump output
60 motor driver output 1
61 external capacitor for the charge pump output
62 external capacitor for the charge pump output
63 external capacitor for the charge pump output
64 power supply for the spindle motor drivers
1997 Jul 10
5
5 Page 
Philips Semiconductors
Brushless DC motor and VCM drive circuit
with speed control
Product specification
TDA5341
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 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 (<<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 60 µA, from
0.03 to 0.3 V. Above this level it is charged, with a current
of 5 µA, 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 30 µA. The watchdog time is
the time taken to charge the capacitor, with a current of
5 µA, from 0.3 to 2.2 V. The value of CAPTI is given by:
C = 5 × 10–6 × 1--t--m.--9- = 2.63tm
Where: C is in nF and t is in ms.
Example: If, after switching off, the voltage from a motor
winding is reduced, in 3.5 ms, to within 10 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 Fig.4.
handbook, full pagewidth
VMOT1
voltage
on CAPTI
MGE821
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).
Fig.4 Typical CAPTI and VMOT1 voltage waveforms in normal running mode.
1997 Jul 10
11
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet TDA5341G.PDF ] | |
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