TDA5341 [NXP]
Brushless DC motor and VCM drive circuit with speed control; 直流无刷电机和VCM驱动电路与速度控制
| 型号： | TDA5341 |
| 厂家： | 
NXP |
| 描述： | Brushless DC motor and VCM drive circuit with speed control |
| 文件： | 总28页 (文件大小：172K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
DATA SHEET
TDA5341
Brushless DC motor and VCM drive
circuit with speed control
1997 Jul 10
Product specification
File under Integrated Circuits, IC11
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
FEATURES
APPLICATIONS
• Full-wave commutation (using push-pull output stages)
• Hard Disk Drive (HDD).
without position sensors
• Built-in start-up circuitry
• Three push-pull MOS outputs:
– 1 A output current
GENERAL DESCRIPTION
The TDA5341 is a BiCMOS integrated circuit used to drive
brushless DC motors in full-wave mode. The device
senses the rotor position using an EMF sensing technique
and is ideally suited as a drive circuit for a hard disk drive
motor.
– Low voltage drop
– Built-in current limiter
• Thermal protection
The TDA5341 also includes a Voice Coil Motor driver
(VCM), reset and park facilities and an accurate speed
regulator. In addition, a serial port facilitates the control of
the device.
• General purpose operational amplifier
• Reset generator
• Motor brake facility
• Actuator driver (H-bridge current-controlled)
• Power-down detector
• Automatic park and brake procedure
• Adjustable park voltage
• Sleep mode
• Speed control with Frequency-Locked Loop (FLL)
• Serial port
• Friction reduction prior to spin-up.
QUICK REFERENCE DATA
Measured over full voltage and temperature range.
SYMBOL
VDD
PARAMETER
MIN.
4.5
TYP.
5.0
MAX.
5.25
UNIT
general supply voltage for logic and power
motor output current
V
A
Ω
A
Ω
IoMOT
1.3
−
1.6
1.1
1.1
2.0
1.9
1.56
1.4
RDS(MOT)
IoACT
motor output resistance
actuator output current
0.7
−
RDS(ACT)
actuator output resistance
2.5
ORDERING INFORMATION
TYPE
PACKAGE
NUMBER
NAME
DESCRIPTION
VERSION
TDA5341G
LQFP64
SOT314-2
plastic low profile quad flat package; 64 leads; body 10 × 10 × 1.4 mm
1997 Jul 10
2
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
BLOCK DIAGRAM
CAPXA CAPXB CAPYA CAPYB
CNTRL CAPCPC
ILIM
23
61
59
62
63
24
22
27
9
UPPER VOLTAGE
CONVERTER
CURRENT
LIMIT
CONTROL
CONTROL
AMPLIFIER
CAPCP
FREDENA
20
60
PRESET
MOT1
12
THERMAL
SWITCH
TESTIN
POWER 1
POWER 2
POWER 3
18
19
ADAPTIVE
COMMUTATION
DELAY
CAPCDM
CAPCDS
8
MOT2
MOT3
21
2
1
TIMING
OSCILLATOR
CAPTI
CAPST
BRAKE
COMMUTATION
AND
COMPARATORS
BAND GAP 2
START
OSCILLATOR
OUTPUT
DRIVING
LOGIC
7
MOT0
11
10
58
3
BRAKE
CONTROLLER
CLAMP1
CLAMP2
26
FG
43
44
54
POLES
DIVIDER
RESETOUT
UVDIN1
FMOT
UNDER-VOLTAGE
DETECTOR
brake
UVDIN2
39
38
42
57
46
4
CLOCK
DATA
BRAKEDELAY
AMPOUT
BAND GAP 1
SERIAL
PORT
BRAKE
AFTER PARK
5
6
sleep
fill
ENABLE
RESET
AMPIN−
AMPIN+
DIGITAL
FREQUENCY
COMPARATOR
32
53
CHARGE
PUMP
FILTER
PROGRAMMING
FREQUENCY
DIVIDER
48
SENSEOUT
SENSEIN+
SENSEIN−
ROSC
52
51
SENSE
AMPLIFIER
35
30
DPULSE
park
37
45
28
29
RETRACT
VCM+
VCM−
VCM
H-BRIDGE
33
34
36
V
CMIN1
VCM
PREAMPLIFIER
FB1
FB2
V
CMIN2
V
ref
15
TDA5341
GAINSEL
50
14
55
31
49
17
25
64
40
16
41
V
V
V
V
V
V
V
V
V
V
V
DDD
MGE817
EED
EE1
EE2
EE3
EE4
EE
DD1
DD2
DD3
DD
Fig.1 Block diagram.
3
1997 Jul 10
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
PINNING
SYMBOL
CAPST
PIN
DESCRIPTION
external capacitor for starting oscillator
external capacitor for timer circuit
1
CAPTI
CLAMP1
AMPOUT
AMPIN−
AMPIN+
MOT0
2
3
external capacitor used to park the heads; must be externally connected to CLAMP2
uncommitted operational amplifier output
uncommitted operational amplifier invert input
uncommitted operational amplifier direct input
motor centre tap input
4
5
6
7
MOT2
8
motor driver output 2
FREDENA
FG
9
friction reduction mode enable input (active HIGH)
frequency generator (tacho) output
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
BRAKE
TESTIN
TP1
brake input command (active LOW)
test input for power output switch-off (active HIGH)
test purpose 1 (should be left open-circuit)
ground for the spindle motor drivers
VEE1
GAINSEL
VDD
VCM gain adjustment input (switch ON when GAINSEL is LOW)
general power supply
VEE
general ground
CAPCDM
CAPCDS
PRESET
MOT3
external capacitor for adaptive commutation delay (master)
external capacitor for adaptive commutation delay (slave)
set the motor drivers into a fixed state: MOT1 = F (floating), MOT2 = L, MOT3 = H
motor driver output 3
CAPCPC
ILIM
frequency compensation of the current control
current limit control input
CNTRL
VDD1
motor control
power supply 1 for the spindle motor drivers
external capacitor used to park the heads; must be externally connected to CLAMP1
external capacitor for the charge pump output
output of the VCM preamplifiers
CLAMP2
CAPCP
FB1
FB2
switchable output of the VCM preamplifier
park input command (active LOW)
RETRACT
VEE3
ground 3 for the actuator driver
FILTER
VCMIN1
VCMIN2
DPULSE
Vref
charge pump output to be connected to an external filter
VCM voltage control input
switchable VCM voltage control input
data pulse input of the frequency comparator of the speed control
voltage reference input
VCM+
DATA
positive output of the VCM amplifier
input data of the serial port (active HIGH)
clock input signal to shift DATA into SERIALIN register (active HIGH)
power supply 3 for the actuator driver
CLOCK
VDD3
1997 Jul 10
4
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
SYMBOL
VDDD
PIN
DESCRIPTION
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
digital power supply
ENABLE
RESETOUT
UVDIN1
VCM−
enable input; enables the serial port, i.e. allows DATA to be shifted in (active LOW)
under-voltage detector output flag (active LOW)
external capacitor for the RESETOUT duration
negative output of the VCM amplifier
BRAKEDELAY
TP2
delay control input for brake after park
test purpose 2 (should be left open-circuit)
reference oscillator input for motor speed control
ground 4 for the actuator driver
ROSC
VEE4
VEED
digital ground
SENSEIN−
SENSEN+
SENSEOUT
UVDIN2
VEE2
inverting input of the VCM sense amplifier
non-inverting input of the VCM sense amplifier
output of the VCM sense amplifier
external voltage reference for the under-voltage detector
ground 2 for the spindle motor drivers
TP3
test purpose 3 (should be left open-circuit)
reset input; forces all bits of the SERIALIN register to 0 (active HIGH)
tachometer output (one pulse per mechanical revolution)
external capacitor for the charge pump output
motor driver output 1
RESET
FMOT
CAPXB
MOT1
CAPXA
CAPYA
CAPYB
VDD2
external capacitor for the charge pump output
external capacitor for the charge pump output
external capacitor for the charge pump output
power supply for the spindle motor drivers
1997 Jul 10
5
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
CAPST
CAPTI
1
2
48 ROSC
47 TP2
3
CLAMP1
AMPOUT
AMPIN−
AMPIN+
MOT0
46 BRAKEDELAY
45 VCM−
4
5
44 UVDIN1
43 RESETOUT
42 ENABLE
V
6
7
8
MOT2
41
40
DDD
DD3
TDA5341
V
9
FREDENA
FG
10
39 CLOCK
38 DATA
37 VCM+
BRAKE 11
TESTIN 12
TP1 13
V
36
ref
V
14
35 DPULSE
EE1
V
V
GAINSEL 15
34
33
CMIN2
CMIN1
V
16
DD
MGE816
Fig.2 Pinning diagram.
6
1997 Jul 10
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
• Speed control based on FLL technique
FUNCTIONAL DESCRIPTION
• Serial port DATAIN (24 bits)
The TDA5341 offers a sensorless three-phase motor
full-wave drive function. The device also offers protected
outputs capable of handling high currents and can be used
with star or delta connected motors.
• Friction reduction prior to spin-up.
TDA5341 modes description
The TDA5341 can easily be adapted for different motors
and applications.
The TDA5341 can be used in two main modes, depending
on whether they are controlled or not.
The TDA5341 offers the following features:
• Sensorless commutation by using the motor EMF
• Built-in start-up circuit
The ‘controlled modes’ (user commands) are executed by
the TDA5341 without delay or priority treatment, either by
software via the serial port or by hardware. BRAKE is a
hardware command whereas RETRACT can be controlled
in both ways. If it is preferable to control the heads parking
via the serial bus, the equivalent pin can be left
open-circuit.
• Optimum commutation, independent of motor type or
motor loading
• Built-in flyback diodes
• Three-phase full-wave drive
• High output current (1.3 A)
• Low MOS RDSon (1 Ω)
The sleep mode is controlled by software only; it results
from the combination of the spindle and actuator being
disabled. The spindle is turned off by bit SPINDLE
DISABLE, whereas the actuator is disabled towards bit
VCM DISABLE of the serial port (see Section “Serial
port”). In addition, a special spin-up mode can be activated
in the event of high head stiction
• Outputs protected by current limitation and thermal
protection of each output transistor
• Low current consumption
• Additional uncommitted operational amplifier
The ‘uncontrolled modes’ only result from different failures
caused by either a too high internal temperature or an
abnormally low power voltage, which will cause the
actuator to retract and, after the spindle, to brake.
The output signals mainly affected by those failures are
RESETOUT, MOT1, 2 and 3, VCM+ and VCM−. This is
summarised in Tables 1 and 2.
• H-bridge actuator driver current controlled with an
external series sense resistor
• Automatic retract procedure
• Adjustable park voltage
• Sleep mode
• Automatic brake (after park) procedure
Table 1 Summary of controlled modes
HARDWARE/
SOFTWARE
VCM+ AND
MODE
MOT1, 2 AND 3
RESETOUT
EFFECT
VCM−
Software
Software
Hardware
spindle disable
VCM disable
brake
high impedance
not affected
LOW
high impedance
high impedance
not affected
HIGH
HIGH
HIGH
HIGH
spindle off
spindle on; VCM off
spindle coils ground
heads parked
Software/
hardware
retract
not affected
VCM− = 0.65 V;
VCM+ = 0 V
Hardware
friction reduction
−
not affected
HIGH
heads in vibration
1997 Jul 10
7
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
Table 2 Summary of uncontrolled modes
FAILURE
Thermal
MOT1, 2 AND 3
VCM+ AND VCM−
RESETOUT
EFFECT
high impedance → LOW
VCM− = 0.65 V;
LOW
automatic park and brake
shut-down
VCM+ = 0 V
Voltage
high impedance → LOW
VCM− = 0.65 V;
LOW
automatic park and brake
shut-down
VCM+ = 0 V
Controlled modes
FRICTION REDUCTION
Pulling FREDENA HIGH activates the friction reduction
mode of the TDA5341. In that mode, a clock signal fed via
pin TESTIN will cause the MOT outputs to sequentially
switch-on and switch-off at the same frequency and, as a
result, generate an AC spindle torque high enough to
overcome the head stiction.
SPINDLE DISABLE
The spindle circuitry is switched off when bit 23 (SPINDLE
DISABLE) of the serial port is pulled HIGH. In that mode,
the reference band gap generator is cut off so that all
internal current sources are disabled. Both the spindle and
actuator outputs will be set to the high impedance state
because the upper converter is also turned off.
Before start-up, the head stiction might be higher than
normal due to condensation between the head(s) and the
disk(s). Normal spin-up is not possible when this friction
torque is higher than the start-up torque of the spindle
motor. Spin-up is then only possible after friction has been
reduced by breaking the head(s) free. Bringing a static
friction system into mechanical resonance is an effective
method to break static friction head(s) free.
It should be noted that the uncommitted operational
amplifier is also disabled in that mode.
VCM DISABLE
The actuator will be disabled when bit 22 (VCM DISABLE)
is set to logic 1; the spindle circuitry is not affected in that
mode. The retract circuitry also remains active, so that the
heads can be parked although the VCM is disabled. In that
mode, the current consumption can be reduced by ±4 mA.
The resonance frequency is:
1
C
---
J
fres
=
× 0.5
------
2π
SLEEP MODE
Where:
The sleep mode is obtained by pulling both the SPINDLE
and VCM DISABLE bits of the serial port HIGH. The power
monitor circuitry only remains active in sleep mode.
C = Stiffness of the head-spring(s) in direction of disk(s)
rotation, (N/m)
J = Inertia of the disk(s), (kg/m2).
The external clock input frequency must be:
RETRACT
6
C
---
J
fclk
=
× 0.5
------
2π
Retract is activated by pulling either bit 21 (PARK) HIGH
or RETRACT (pin 30) LOW. When RETRACT is set LOW,
a voltage of 0.65 V is applied to pin VCM− for parking.
A burst of n × 6 clock pulse will bring the system into
resonance and break the heads free (n > 2). Once the
heads have been broken free, the normal spin-up
procedure can be applied.
It should be noted that the park voltage can be made
adjustable by changing one of the interconnect masks.
Accordingly, some different voltages, varying from
0.2 to 1.2 V, can quickly be obtained on customer
demand. This mode does not affect the control of the
spindle rotation.
It should be noted that the clock frequency must be smaller
than 40000/CAPCDM (nF).
BRAKE MODE
The brake mode is activated by pulling BRAKE (pin 11)
LOW. When a voltage of less than 0.8 V is applied to pin
BRAKE, the 3 motor outputs are short-circuited to ground,
which results in a quick reduction of the speed until the
motor stops completely.
1997 Jul 10
8
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
The system will only function when the EMF voltage from
the motor is present. Consequently, a start oscillator is
provided that will generate commutation pulses when no
zero-crossings in the motor voltage are available.
Uncontrolled modes
POWER SHUT-DOWN
If the power supply decreases to less than the voltage
threshold determined by the ratio between R1 and R2
connected to UVDIN2 (see Fig.8) (for more than 1 µs), the
TDA5341 will issue a reset (RESETOUT goes LOW) and
the following operation will start:
A timing function is incorporated into the device for internal
timing and for timing of the reverse rotation detection.
The TDA5341 also contains a control amplifier, directly
driving output amplifiers.
• Firstly, the MOT outputs are switched to the high
impedance state so as to get back the rectified EMF
issued from the motor itself. At the same time, the
voltage upper converter is cut off in order to preserve the
voltage on the charge pump capacitance at CAPCP.
The energy supplied in that way is then used to park the
heads in a safe position
The TDA5341 also provides access to the user of some of
its internal test modes. Firstly, a PRESET mode can be
used for prepositioning the three motor output drivers into
a fixed state. By pulling pin PRESET to 0.75 V above VDD
MOT3 goes HIGH, MOT2 goes LOW and MOT1 goes to
the high impedance state.
,
• Secondly, after a certain period of time, depending on
the RC constant of the device connected to
BRAKEDELAY, the lower MOS drivers will be turned on
in order to stop the motor completely.
In addition, when TESTIN is pulled HIGH (provided that
FREDENA is LOW), the 3 motor output drivers are
switched off. It should be noted that RESETOUT goes
LOW in that particular event.
THERMAL SHUT-DOWN
Adjustments
Should the temperature of the chip exceed +140 ±10 °C, a
shut-down operation will also be processed. The actions
described for power shut-down will be sequenced in the
same manner.
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
SPINDLE SECTION (see Fig.1)
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 current and one
sinking current. The third output presents a high
impedance to the motor which enables measurement of
the motor 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.
• 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 (CAPST)
This capacitor determines the frequency of the start
oscillator. It is charged and discharged, with a current of
5.5 µA, from 0.05 to 2.2 V and back to 0.05 V. The time
taken to complete one cycle is given by:
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, i.e.
the change to the next output state. The delay is calculated
(depending on the motor loading) by the adaptive
commutation delay block.
tstart = (0.78 × C); where C is given 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). If the
movement of the motor generates enough EMF the
TDA5341 will run the motor.
Because of high inductive loading the output stages
contain flyback diodes. The output stages are also
protected by a current limiting circuit and by thermal
protection of the six output transistors.
The zero-crossings can be used to provide speed
information such as the tacho signal (FG).
1997 Jul 10
9
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
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 oscillation of the motor is given by:
During the next commutation period this capacitor
(CAPCDM) is discharged at twice the charging current.
The charging current is 10 µA and the discharging current
20 µA; the voltage range is from 0.87 to 2.28 V.
The voltage must stay within this range at the lowest
commutation frequency of interest, fC1
:
1
--
2
10 × 10–6
------------------------
f × 1.41
7092
------------
fC1
0.5
-------
Π
P
---
J
C =
=
fosc
=
× K × I ×
t
Where C is in nF.
Where:
Kt = torque constant (N.m/A)
I = current (A)
If the frequency is lower, then a constant commutation
delay after the zero-crossing is generated by the discharge
from 2.28 to 0.87 V at 20 µA.
p = number of magnetic pole-pairs
J = inertia J (kg/m2).
Maximum delay = (0.070 × C) ms: Where C is in nF.
Example: nominal commutation frequency is 3240 Hz and
the lowest usable frequency is 1600 Hz, thus
CAPCDM = 7092/1600 = 4.43 (choose 4.7 nF)
Example: J = 6.34 × 10−7 kg/m2, K = 4.5 × 10−3 N.m/A,
p = 6 and I = 0.48 A; thus fosc = 22.7 Hz. Without
damping, a start frequency of 48.4 Hz can be chosen or
t = 24 ms, thus C = 0.024/0.78 = 0.031 µF, (choose
33 nF).
The other capacitor, CAPCDS, is used to repeat the same
delay by charging and discharging with 20 µA. The same
value can be chosen as for CAPCDM. Figure 3 illustrates
typical voltage waveforms.
The Adaptive Commutation Delay
(CAPCDM and CAPCDS)
In this circuit capacitor CAPCDM is charged during one
commutation period, with an interruption of the charging
current during the diode pulse.
voltage
on CAPCDM
voltage
on CAPCDS
MGE820
Fig.3 CAPCDM and CAPCDS voltage waveforms in normal running mode.
1997 Jul 10
10
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
The Timing Capacitor (CAPTI)
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:
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.
tm
C = 5 × 10–6
×
= 2.63t
-------
m
1.9
Where: C is in nF and t is in ms.
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).
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:
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).
C = 2.63 × 3.5 = 9.2 (choose 10 nF)
Typical voltage waveforms are illustrated by Fig.4.
V
MOT1
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
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
Other design aspects
Current limiting
Outputs MOT1 to MOT3 are protected against high
currents in two ways; current limiting of the ‘lower’ output
transistor and current limiting of the ‘upper’ one.
This means that the current from and to the output stages
is limited.
There are other design aspects concerning the application
of the TDA5341 besides the commutation function.
They are as follows:
• Generation of the tacho signal FG
• Motor control
It is possible to adjust the limiting current externally by
using an external resistor connected between pin ILIM and
ground, the value is determined by the formula:
• Current limiting
• Thermal protection.
2.54
R
IILIM = 10020 ×
-----------
FG signal
The FG signal is generated in the TDA5341 by using the
zero-crossing of the motor EMF from the three motor
windings and the commutation signal.
Where R = R (min.) = 19.5 kΩ and IILIM = 1.3 A.
If R < 19.5 kΩ, then IILIM is internally limited for device
protection purposes.
Output FG switches from HIGH-to-LOW on all
zero-crossings and LOW-to-HIGH on all commutations
and can source more than 40 µA and sink more than
1.6 mA.
Thermal protection
Thermal protection of the six output transistors of the
spindle section is achieved by each transistor having a
thermal sensor that is active when the transistor is
switched on. The transistors are switched off when the
local temperature becomes too high. In that event, a
RESET is automatically generated to the external world by
pulling RESETOUT LOW.
Example: A three-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.
Motor control
Figure 5 shows the spindle transconductance by giving the
relative output current as a function of the voltage applied
to pin CNTRL.
Reset section
This circuit provides the following:
• An external signal that sends a RESETOUT (active
LOW) to the disk drive circuitry at power-up and
power-down
• Causes actuator to retract (PARK).
MGE822
handbook, halfpage
100
The power-up reset signal (RESETOUT) applied to
external circuits as a digital output is typically 150 ms after
power-up. In the same way, as soon as VDD goes below a
threshold that is externally set (UVDIN2), RESETOUT
goes LOW. The under voltage detection threshold is
adjustable with external resistors (see Fig.8).
I
o
(% of I
)
max
80
60
40
20
0
The reset circuitry has a minimum output pulse (100 ms)
even for brief power interruptions (higher than 1 ms).
The pulse duration can be adjusted with an external
capacitor (UVDIN1).
0
1
2
3
4
5
control voltage (V)
Fig.5 Output current control.
1997 Jul 10
12
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
The power for retraction is received from the rectification
of the EMF of the spindle before it is spun down.
After retraction, a brake procedure is automatically settled.
The time needed for retraction, prior to braking, can be
precisely adjusted with the external RC device connected
to pin BRAKEDELAY. The discharge of the capacitance
across the resistance from VDD − 0.7 V down to 1 V will
provide the desired time constant.
An operational amplifier input allows passive external
components for compensation and gain setting.
The compensation amplifier is able to be pulled out of a
saturation state within 5 µs and its output swing is
VDD − 1.5 V.
An actuator current-sense amplifier is provided for use by
the disc drive controller. The gain from current-sense
resistor to sense the amplifier output is typically 10 (±3%)
and the output voltage swing is ±1.25 V. An input common
mode range insures operation through all normal coil
voltage excursions. Maximum recovery time from
saturation is 20 µs (typ.).
Actuator section
The actuator driver has a control input voltage that is
proportional to the actuator current which is capable of a
closed-loop band-pass frequency higher than 10 kHz.
TRANSFER FUNCTION
actuator
C
L1
C
L2
R
s
R
IN1
input
FB2
FB1
VCM− VCM+ SENSEIN− SENSEIN+
R
IN2
V
CMIN2
GAINSEL
R
f
V
CMIN1
OUTPUT
GAIN 11
PREAMP
V
ref
SENSEOUT
SENSE
AMP
TDA5341
MGE825
Fig.6 VCM section application diagram.
1
--------------------------------------------------------------------------------------------------------------------
IN × (Rf × Rs + Rf × ZVCM + 110 × Rs × ZL)
T = –11 × Rf × ZL ×
R
With GAINSEL = HIGH; RIN = RIN1
R
IN1 × RIN2
With GAINSEL = LOW; RIN
1997 Jul 10
=
------------------------------
R
IN1 + RIN2
13
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
Speed control function
Serial port
The serial port operates as follows:
Speed control is efficiently achieved by the
frequency-locked loop circuitry which is enabled by bit D20
of the CONTROL register.
When ENABLE is HIGH, the serial port is disabled, which
means the TDA5341 functions regardless of any change
at pins DATA and CLOCK.
Its aim is to keep the tachometer signal set to a reference
programmed by the user via the serial port (see Section
“Serial port”).
When ENABLE is set LOW some set-up time before the
falling edge of CLOCK, the serial port is enabled, i. e. data
is serially shifted into the 24-bit shift register on the falling
edge of the CLOCK signal. The least significant bit
(LSB = DATA 0) is the first in, DATA(23) the MSB is the
last in.
The FLL operates as follows:
When power is first applied to the circuit, the FILTER pin is
pulled HIGH so that maximum output current can be
sourced for optimum torque.
When ENABLE goes HIGH, the contents of the shift
register are loaded into the internal fixed register
(CONTROL register), it will not change until the next rising
edge of ENABLE.
FG pulses will appear rapidly so as to provide a ‘clean’
clock signal (FMOT) that will issue one pulse per
mechanical revolution. This may be used for speed
regulation, by re-entering the signal through the DPULSE
pin. Then, after it has been synchronised to the ROSC
clock, it is compared to an accurate reference derived from
the ROSC clock and programmed by the user via the serial
port. The resulting variation in frequency generates a
speed error term that will switch a charge-pump up or
down in order to charge or discharge an external RC filter
(FILTER). The voltage at the FILTER pin is then used as
an input to the current control amplifier that regulates the
current in both upper and lower NMOS transistors.
It should be noted that when RESET goes HIGH it will
force all bits of the shift register and the control register to
logic 0. However, there is no reset effect on both power-up
and power-down i.e there is no correlation between
RESET and RESETOUT.
CLOCK can be stopped (either in the HIGH or LOW state)
once RESET or ENABLE have been asserted.
The 24-bit control register is organized as follows:
• D23: SPINDLE DISABLE
A velocity regulation based upon (maximum) one
corrective action per mechanical revolution may be
considered insufficient in some applications. That is the
reason why the second input of the FLL circuitry was
intentionally left open-circuit and directly accessible to the
external world via pin DPULSE. In that way, total freedom
is given to the user to use any signal coming out of the
microcontroller in order to regulate the motor velocity with
a finer accuracy.
– When LOW, the spindle circuitry is enabled
• D22: VCM DISABLE
– When LOW, the actuator circuitry is enabled
• D21: PARK
– When HIGH, it enables the head retraction. This has
the same effect as pin RETRACT pulled LOW
• D20: FLL ENABLE
Moreover, a mixed regulation is also possible: firstly,
the FMOT signal is fed via DPULSE into the FLL circuitry
and then once data is read out off the disc, it is switched to
another clock signal with a higher frequency than FMOT.
Simultaneously, a new division factor is programmed via
the serial port.
– When HIGH, it closes the complete speed regulation
loop
– When LOW, it will set the output of the charge pump
(FILTER) to the high impedance state
• D19 and D18
– The combination of these bits fixes the division factor
to apply on the FG signal with respect to the number
of poles.
It should be noted that there is no need for external
synchronization. However, it is recommended to change
the division factor and the DPULSE clock rate during the
period when FMOT is HIGH.
1997 Jul 10
14
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
Table 3 Division factor
Example: for a motor speed of 3600 rpm and a reference
oscillation ROSC of 16 MHz, the division factor that has to
be programmed via the bus, will be:
D19
D18
POLE PAIRS
0
0
1
1
0
1
0
1
4
6
16 × 10–6
3600
DIV = 7.5 ×
= 33333
------------------------
8
The resulting error will be less than 0.04 rpm.
12
• D17 to D0
These bits program the division factor to apply to the
ROSC signal so as to generate a reference that will
precisely control the spindle rotation;
– The division factor can range from 8 (DIV = 1) to
8 × [218 − 1] = 2097144 (DIV = 3FFFF)
– The relationship between this division factor, ROSC
and the motor frequency is as follows:
DIVISION FACTOR = 7.5 × ROSC/MOTOR speed
where the MOTOR speed is given in rpm and ROSC
in Hz.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL PARAMETER
VDD
MIN.
MAX.
5.5
UNIT
positive supply voltage
input voltage (all pins)
−
V
V
V
V
V
Vi
−0.3
−0.25
0.7
−
VDD + 0.3
+5.5
V60,8,21
V45,37,53
V1,2,18,19
Tstg
output voltage pins MOT1, MOT2 and MOT3
output voltage pins VCM−, VCM+ and SENSEOUT
input voltage pins CAPST, CAPTI, CAPCDM and CAPCDS
IC storage temperature
VDD + 0.7
2.5
−55
0
+150
°C
°C
Tamb
operating ambient temperature
+70
Ptot
total power dissipation
see Fig.7
HANDLING
Every pin withstands the ESD test in accordance with MIL-STD-883C. Method 3015 (HBM 1900 Ω, 100 pF) 3 pulses
positive and 3 pulses negative on each pin with reference to ground. Class 1 : 0 to 1999 V.
THERMAL CHARACTERISTICS
SYMBOL
Rth j-a
PARAMETER
VALUE
UNIT
thermal resistance from junction to ambient in free air
54
K/W
1997 Jul 10
15
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
MGE823
3
handbook, halfpage
P
tot
(W)
(2)
2
(1)
1
SAFE
OPERATING
AREA
0
0
50
100
150
T
(°C)
amb
(1) Tj(max) = 130 °C.
(2) Tj(max) = 150 °C.
Fig.7 Power derating curve.
CHARACTERISTICS (SPINDLE FUNCTION)
DD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified.
V
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supply
VDD
general supply voltage
4.5
5.0
5.25
V
V
VDD1
supply voltage 1 for the spindle
motor drivers
4.5
4.5
4.5
5.0
5.0
5.0
5.25
5.25
5.25
VDD2
VDD3
supply voltage 2 for the spindle
motor drivers
V
V
supply voltage for the actuator
driver
IDD
general supply current
−
−
11
15
2
mA
mA
Iq(sm)
quiescent current in sleep mode
1.4
Thermal protection
TSD
local temperature at temperature
sensor causing shut-down
130
−
140
150
−
°C
°C
V
∆T
reduction in temperature before
switch-on
after shut-down
TSD − 30
Vso
test pin switch-off voltage
2.5
−
−
1997 Jul 10
16
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
SYMBOL
MOT0
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Vi
input voltage level
input bias current
−0.3
−
−
V
DD − 1.7 V
Ibias
−1
0
µA
VCSW
∆VCWS
comparator switching voltage level note 1
±6.8
−3.4
±9.2
±11.6
mV
mV
variation in comparator switching
voltage levels within one IC
−
+3.4
MOT1, MOT2 and MOT3; pins 60, 8 and 21
VDO
drop-out voltage
Io = 250 mA
−
−
−
−
0.34
0.39
V
V
Io = 250 mA;
Tamb = 70 °C
tr
tf
output rise time
output fall time
from 0.2 to 0.8VDD
from 0.8 to 0.2VDD
10
10
25
25
35
35
µs
µs
Output current limiting circuit; VILIM = 5 V; pin 23
IILIM
limiting current (estimation)
input voltage
RILIM = 20 kΩ
IILIM = 100 µA
1.15
2.43
0.01
1.25
2.51
−
1.35
2.60
1.3
A
V
A
VILIM
IILIM(CR)
limiting current control range
(estimation)
Io
IILIM
=
----------------
10000
Output current control circuit; pin 24
VCNTRL
CCPC
input voltage level
0
−
VDD
V
control loop stability capacitor
−
100
−
nF
CAPCPC; pin 22
Io(sink)
output sink current
output source current
30
40
50
µA
µA
Io(source)
−5.5
−3.5
−1.5
CAPCP; pin 27
CextCP external output capacitor for the
note 2
22
−
−
−
nF
µA
V
charge pump
Io(sink)
output sink current
VDD = 0 V;
clamp = 1.2 V
1
2.5
10.8
V
VCP
charge pump voltage
9.0
9.9
CAPST; pin 1
Io(sink)
output sink current
4.5
−7.0
−
6.0
7.5
−4.0
−
µA
µA
V
Io(source)
VSW(L)
VSW(M)
VSW(H)
output source current
lower switching level
middle switching level
upper switching level
−5.5
0.20
0.30
2.20
−
−
V
−
−
V
1997 Jul 10
17
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
CAPTI; pin 2
Io(sink)
output sink current
25
35
45
µA
IoH(source)
IoL(source)
VSW(L)
HIGH level output source current
LOW level lower source current
lower switching level
−85
−7.5
−
−70
−5.0
30
−55
−2.5
−
µA
µA
mV
V
VSW(M)
VSW(H)
middle switching level
−
0.3
2.2
−
upper switching level
−
−
V
CAPCDM; pin 18
Io(sink)
output sink current
13
20
27
µA
µA
Io(source)
output source current
−13.5
−2.2
0.82
2.20
−10
−2.0
0.87
2.28
−6.5
−1.8
0.92
2.37
Isink/Isource
ratio of sink-to-source current
LOW level input voltage
HIGH level input voltage
VIL
VIH
V
V
CAPCDS; pin 19
Io(sink)
output sink current
13
20
27
µA
µA
µA
V
Io(source)
output source current
−27
−1.1
0.82
2.20
−20
−1.0
0.87
2.28
−13
−0.9
0.92
2.37
Isink/Isource
ratio of sink-to-source current
LOW level input voltage
HIGH level input voltage
VIL
VIH
V
FG; pin 10
VOL
IOL
IOH
RF
LOW level output voltage
LOW level output current
HIGH level output current
Io = 0 µA
−
−
0.5
−
V
VOL = 1 V
3.3
−
5.3
−83
1
mA
mA
VOH = 4.5 V
−40
−
ratio of FG frequency and
commutation frequency
−
δ
duty factor
−
50
−
%
BRAKE; pin 11
INM
normal mode current
VNM = 2.8 V
−40
2.65
−
−27
−
−
µA
V
VNM
VBM
IBM
normal mode voltage
brake mode voltage
brake mode current
VDD
2.35
−
−
V
−40
−24
µA
Upper converter; pins 61 and 62
CXA
CYA
external pump capacitor pin 61
external pump capacitor pin 62
−
−
10
10
−
−
nF
nF
Notes
1. Switching levels with respect to MOT1, MOT2 and MOT3.
2. CAPCP value is dependant of the powerless park and brake operations.
1997 Jul 10
18
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
CHARACTERISTICS (RESET FUNCTION)
VDD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
UVDIN1; pin 44
IUVDIN1
load capacitance current to
control the reset pulse width
−2.3
−1.7
−1.3
µA
VUVDIN1
input voltage threshold to
activate the reset output
2.4
2.55
2.75
V
UVDIN2; pin 54
VUVDIN2
comparator voltage for
power-up and power-down
detection
see Fig.8
1.280
1.315
1.340
+0.5
V
IUVDIN2
input current
VUVDIN2 = 1.6 V
see Fig.9
−0.5
−
µA
RESETOUT; pin 43
VPTH power threshold voltage
tdPU
−
4.25
150
−
V
power-up reset delay
C = 0.1 µF;
100
200
ms
see Fig.9
tdPD
power-down reset delay
power-down reset pulse width
minimum output pulse width
pull-up resistance
see Fig.9
see Fig.9
C = 0.1 µF
−
−
4
µs
µs
ms
kΩ
V
tPDW
tW(min)
Rpu
1.0
100
6
−
4
−
−
10
−
14
0.5
VOL
LOW level output voltage
IOL = 8.5 mA
−
R2
R1
handbook, halfpage
V
DD
UVDIN2
MGE818
(R2 + R1)
under-voltage threshold = 1.32 × ----------------------------
R1
Fig.8 Reset mode threshold.
1997 Jul 10
19
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
V
DD
V
PTH
V
DD
t
> 4 µs
PDW
t
< 1.2 µs
PDW
t
t
t
d
dPU
dPD
V
OH
RESETOUT
V
OL
t
W(min)
MGE819
Fig.9 Reset mode timing.
CHARACTERISTICS (VCM FUNCTION)
DD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified.
V
SYMBOL PARAMETER CONDITIONS MIN. TYP.
SENSEIN− and SENSEIN+; pins 51 and 52
MAX.
UNIT
VCS
common input sense voltage
input sense current
0
−
−
VDD
+250
V
IiSENSE
−250
µA
SENSEOUT; pin 53
∆VSENSE
IoSENSE
GSENSE
fco
differential output voltage
Vref = 1.9 to 2.6 V 0.5
−250
V
ref ±1.25 4.0
V
output sense current
sense amplifier gain
−
+250
10.5
−
µA
9.9
−
10.2
40
−
cross-over frequency
output offset voltage
recovery time from saturation
MHz
mV
µs
Vo(os)
tRSA
ref; pin 36
ISENSEIN = 0
−66
−
+66
−
20
V
Vref
Iref
reference input voltage
reference input current
1.9
−
−
2.6
+5
V
−5
µA
1997 Jul 10
20
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
VCM+ and VCM−; pins 37 and 45
VCMdo
IoLIM
drop-out voltage
Io = 400 mA
−
0.8
1.0
1.5
12
−
V
output current limiting
power amplifier voltage gain
output park voltage
0.7
9
1.15
−
A
Gv
VoPARK
RL = 40 Ω; note 1
−
0.75
V
VCMIN1 and VCMIN2
Vi
input voltage level
1.9
−
−
2.6
V
Iibias
Ii(os)
input bias current
input offset current
−
0.25
µA
nA
−
25
−
GAINSEL; pin 15
VIH
VIL
IIH
HIGH level input voltage
2
−
−
−
−
−
−
−
V
LOW level input voltage
HIGH level input current
LOW level input current
switch resistance
−
0.8
+10
+10
40
−
V
−10
−20
−
µA
µA
Ω
IIL
RSW
GAINSEL = LOW
GAINSEL = HIGH 10
MΩ
FB1 and FB2; pins 28 and 29
Vi(os)
input offset voltage
−5
−
−
+5
mV
V
∆VFB
feed-back differential output
voltage
VDD = 5.25 V
±0.4
±VDD − 0.45
fco
cross-over frequency
feed-back output current
recovery time from saturation
switch resistance
−
10
−
MHz
µA
µs
IoFB
tRSB
RSW
−250
+250
−
−
−
5
−
−
GAINSEL = LOW
40
−
Ω
GAINSEL = HIGH 10
MΩ
RETRACT; pin 30
VIH
VIL
IIH
HIGH level input voltage
2
−
−
−
−
−
V
LOW level input voltage
HIGH level input current
LOW level input current
−
0.8
+10
+10
V
−10
µA
µA
IIL
−20
BRAKEDELAY; pin 46
VBM
VNM
brake mode threshold voltage
normal mode voltage
−
0.75
1.0
V
V
V
DD − 0.85
−
−
1997 Jul 10
21
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Uncommitted operational amplifier; pins 4 to 6
Vi(os)
Ii(bias)
Ii(os)
VCM
GOL
fco
input offset voltage
input bias current
−3.5
−
+3.5
mV
nA
nA
V
−250
−
−
+250
−
input offset current
25
−
common mode voltage
open loop gain
1.7
−
2.6
−
68
10
−
dB
MHz
V
cross-over frequency
LOW level output voltage
HIGH level output voltage
−
−
VOL
VOH
IOL = 250 µA
−
0.7
−
IOH = −250 µA
4.3
−
V
Note
1. This is the PARK default value. Other values can be obtained with a metal mask change.
CHARACTERISTICS (SPEED CONTROL FUNCTION)
VDD = 5 V; VDD1 and VDD2 > VDD is not allowed; Tamb = 25 °C; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
FILTER; pin 32
Io(sink)
output sink current
80
100
120
−70
1.2
+5
µA
µA
Io(source)
Isink/Isource
ILO
output source current
−110
0.9
−90
1.1
−
ratio of sink-to-source current
charge pump leakage current
−5
nA
DATA, RESET and ENABLE; pins 38, 57 and 42
VIL
VIH
Ii
LOW level input voltage
HIGH level input voltage
input current
−
−
−
0
0.8
−
V
2.4
−
V
−
µA
CLOCK; pin 39
VIL
VIH
fclk
LOW level input voltage
HIGH level input voltage
clock frequency
−
−
−
−
0.8
−
V
2.4
−
V
18
MHz
ROSC; pin 48
VIL
LOW level input voltage
HIGH level input voltage
reference oscillator frequency
−
−
−
−
0.8
−
V
VIH
2.4
1
V
frefOSC
20
MHz
DPULSE; pin 35
VIL
LOW level input voltage
HIGH level input voltage
data pulse frequency
−
−
−
−
0.8
−
V
VIH
2.4
−
V
fDPULSE
10
MHz
1997 Jul 10
22
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
FMOT; pin 58
VOL
LOW level output voltage
duty factor
IOL = 500 µA
−
−
−
0.1
V
δ
50
−
%
Timing; see Fig.10
tsu1
tsu2
th
ENABLE set-up time
8
−
−
−
−
−
−
ns
ns
ns
DATA set-up time
DATA hold time
6
10
CLOCK
t
su1
ENABLE
DATA
t
su2
t
h
SHIFTED
DATA
MGE824
Fig.10 Timing diagram.
1997 Jul 10
23
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
APPLICATION INFORMATION
+5 V
V
V
DD
V
V
V
DDD
DD3
16
CLAMP1 CLAMP2
DD1
64
DD2
40
25
41
3
26
CNTRL
FILTER
MOT1
MOT2
MOT3
MOT0
ILIM
24
60
C2
C1
R1
8
21
7
32
SPINDLE
MOTOR
FREDENA
CLOCK
DATA
9
23
39
38
42
57
48
12
43
11
10
58
35
CAPCPC
UVDIN1
UVDIN2
22
44
54
ENABLE
RESET
ROSC
to micro-
controller
TESTIN
RESETOUT
BRAKE
FG
+5 V
TDA5341
RETRACT
GAINSEL
VCM−
30
15
45
FMOT
DPULSE
R
s
VCM+
37
51
52
53
33
28
34
29
46
CAPCP
CAPXA
CAPXB
CAPYA
27
61
59
62
63
18
19
2
SENSEIN−
SENSEIN+
SENSEOUT
R
f
R
V
IN1
input
CMIN1
CAPYB
CAPCDM
CAPCDS
CAPTI
C
C
L1
FB1
R
V
IN2
CMIN2
L2
FB2
BRAKEDELAY
CAPST
1
50
14
55
31
49
17
36
V
V
V
V
EE
EE4
V
V
V
EED
EE2
EE3
EE1
ref
MGE826
Fig.11 Application diagram of the TDA5341 in a hard disk drive.
24
1997 Jul 10
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
PACKAGE OUTLINE
LQFP64: plastic low profile quad flat package; 64 leads; body 10 x 10 x 1.4 mm
SOT314-2
y
X
A
48
33
Z
49
32
E
e
Q
H
A
E
2
E
A
(A )
3
A
1
w M
p
θ
b
L
p
pin 1 index
L
64
17
detail X
1
16
Z
v
M
A
D
e
w M
b
p
D
B
H
v
M
B
D
0
2.5
5 mm
scale
DIMENSIONS (mm are the original dimensions)
A
(1)
(1)
(1)
(1)
UNIT
A
A
A
b
c
D
E
e
H
D
H
L
L
Q
v
w
y
Z
Z
E
θ
1
2
3
p
E
p
D
max.
7o
0o
0.20 1.45
0.05 1.35
0.27 0.18 10.1 10.1
0.17 0.12 9.9 9.9
12.15 12.15
11.85 11.85
0.75 0.69
0.45 0.59
1.45 1.45
1.05 1.05
1.60
mm
0.25
0.5
1.0
0.2 0.12 0.1
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
REFERENCES
OUTLINE
EUROPEAN
PROJECTION
ISSUE DATE
VERSION
IEC
JEDEC
EIAJ
94-01-07
95-12-19
SOT314-2
1997 Jul 10
25
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
If wave soldering cannot be avoided, the following
conditions must be observed:
SOLDERING
Introduction
• A double-wave (a turbulent wave with high upward
pressure followed by a smooth laminar wave)
soldering technique should be used.
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.
• The footprint must be at an angle of 45° to the board
direction and must incorporate solder thieves
downstream and at the side corners.
Even with these conditions, do not consider wave
soldering LQFP packages LQFP48 (SOT313-2),
LQFP64 (SOT314-2) or LQFP80 (SOT315-1).
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). 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.
Reflow soldering
Reflow soldering techniques are suitable for all LQFP
packages.
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
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.
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.
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.
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.
Preheating is necessary to dry the paste and evaporate
the binding agent. Preheating duration: 45 minutes at
45 °C.
Wave soldering
Wave soldering is not recommended for LQFP packages.
This is because of the likelihood of solder bridging due to
closely-spaced leads and the possibility of incomplete
solder penetration in multi-lead devices.
1997 Jul 10
26
Philips Semiconductors
Product specification
Brushless DC motor and VCM drive circuit
with speed control
TDA5341
DEFINITIONS
Data sheet status
Objective specification
Preliminary specification
Product specification
This data sheet contains target or goal specifications for product development.
This data sheet contains preliminary data; supplementary data may be published later.
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.
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.
1997 Jul 10
27
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Internet: http://www.semiconductors.philips.com
Building BE-p, P.O. Box 218, 5600 MD EINDHOVEN, The Netherlands, Fax. +31 40 27 24825
© Philips Electronics N.V. 1997
SCA55
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
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under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
297027/1200/01/pp28
Date of release: 1997 Jul 10
Document order number: 9397 750 02621
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