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PDF L6243 Data sheet ( Hoja de datos )
| Número de pieza | L6243 | |
| Descripción | VOICE COIL MOTOR DRIVER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L6243 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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L6243
L6243D
VOICE COIL MOTOR DRIVER
12V/5V OPERATION
PARKING FUNCTION FOR HARD DISK
HEAD ACTUATOR
OUTPUT CURRENT UP TO 2A DC, 2.5A
PEAK
LOW SATURATION VOLTAGE
LOGIC AND POWER SUPPLY MONITOR
LINEAR CONTROL
THERMAL PROTECTION
ENABLE FUNCTION
CURRENT SENSE RESISTOR CONNEC-
TIONS
DESCRIPTION
The L6243/D is a Bipolar IC developed for use in
Hard Disk Head Actuator positioning applications.
The Power Op-Amp Output Bridge, Differential
Amplifier, and Error Amplifier, are controlled by
TTL/CMOS, input compatible, Digital Logic, and
an Analog Current Control Voltage. A simple
RC compensation network, tied to the output of
the Error Amp, will configure the system to work
BLOCK DIAGRAM
PLCC44
SO(24+2+2)
ORDERING NUMBERS:
L6243
L6243D
as a Transconductance Amplifier to drive a
Voice Coil Motor in Linear Mode.
Additional features include Power On Reset De-
lay, Enable and Park, as well as a general pur-
pose Operational Amplifier. A logic low at the
Park input activates the parking function. Holding
the Enable input low will disable the device by
forcing the outputs into a tristate mode. Power
Fail Monitors for the logic and power supplies in-
itiate an automatic parking sequence during a
power failure. A resistor programmed parking
voltage enables a constant velocity head retract.
July 1996
1/12
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
1 page  
ELECTRICAL CHARACTERISTICS (continued)
MONITORS AND CONTROL CIRCUIT
Symbol
Vt1
Vt2
HVt1
HVt2
Vll
Ie
Ip
Rf
Venl
Ve nh
Vph
Vpl
Vpfl
Iprog
Ich
Td
Parameter
Test Condition
Threshold Voltage at Logic
Supply Sense
Threshold Voltage at Power Fail
Threshold Input
Hysteresis on Vt1
Hysteresis on Vt2
Low Level Voltage
Write Disable = 2mA
Power on Reset = 2mA
Enable Input Current
Vi = 2.4V
Input Current at Park
Equivalent Input Resistance at
5V Filter Input
Vi = 0.4V
Vi = 2.4V
Vi = 0.4V
Enable Low Input Voltage
Enable High Input Voltage
Parking Input High Voltage
Parking Input Low Voltage
Power Fail Low Output Voltage Il = 2mA
Parking Voltage Program Current
Power On Reset Delay
Capacitor Charging
Delay Between Write Disable
and Power on Reset Falling
Edges
L6243-L6243D
Min.
4.45
Typ.
4.60
Max.
4.75
Unit
V
1.375 1.4 1.435 V
50 mV
15 mV
250 500 mV
250 500 mV
100 µA
–200 µA
100 µA
–200 µA
6.9 KΩ
0.8 V
2V
2V
0.8 V
0.5 V
100 µA
10 µA
4 10 µs
FUNCTIONAL DESCRIPTION
The VCM Driver is controlled via three control sig-
nals, ENABLE, POWER ON RESET, and WRITE
DISABLE. An analog input voltage, ERROR AMP
IN, controls the polarity and amplitude of the VCM
driving current.
Refer to figure two. This diagram is a repre-
sentation of the function of the VCM System.
Note that the signals with the bars represent the
”not true”, or ”non asserted” condition. From in -
itial power up, the system is held in the Park
Mode. Upon completion of the POWER UP RE-
SET DELAY the machine moves to Tristate Mode
or Run Mode, depending upon the condition of
the ENABLE input. If ENABLE is asserted, the
machine moves directly to Run Mode. If ENABLE
is not asserted, the machine moves to Tristate
Mode.
POWER ON RESET is an asynchronous output.
Additionally it affects the internal logic as a hard
wired reset and therefore if a supply failure occurs
during Tristate or Run state, the machine moves
directly back to the Park Mode. A WRITE DIS-
ABLE occurs a few to ten microseconds prior to
the POWER ON RESET in order for the system
to halt any read/write activity before a head re-
tract begins.
While in Tristate Mode, the assertion of ENABLE
will move the machine to the Run Mode. Run
Mode will typically be the steady running state.
The deassertion of the ENABLE signal causes
the machine to move into Tristate. If it is desired
to perform an active Parking function, the PARK
input must be driven low by the external hard-
ware, or the the VCM can be driven to the Park
position via the ERROR AMP IN control voltage
5/12
5 Page 
SO28 PACKAGE MECHANICAL DATA
DIM.
A
a1
b
b1
C
c1
D
E
e
e3
F
L
S
MIN.
0.1
0.35
0.23
17.7
10
7.4
0.4
mm
TYP.
0.5
1.27
16.51
MAX.
2.65
0.3
0.49
0.32
MIN.
0.004
0.014
0.009
45° (typ.)
18.1 0.697
10.65
0.394
7.6 0.291
1.27 0.016
8° (max.)
L6243-L6243D
inch
TYP.
0.020
0.050
0.65
MAX.
0.104
0.012
0.019
0.013
0.713
0.419
0.299
0.050
11/12
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet L6243.PDF ] | |
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