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參數(shù)資料
| 型號(hào)： | L6243D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | VOICE COIL MOTOR CONTROLLER, 2.5 A, PDSO28 |
| 封裝： | SO-28 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 2162K |
| 代理商： | L6243D |
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
ELECTRICAL CHARACTERISTICS (continued)
MONITORS AND CONTROL CIRCUIT
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
Vt1
Threshold Voltage at Logic
Supply Sense
4.45
4.60
4.75
V
Vt2
Threshold Voltage at Power Fail
Threshold Input
1.375
1.4
1.435
V
HVt1
Hysteresis on Vt1
50
mV
HVt2
Hysteresis on Vt2
15
mV
Vll
Low Level Voltage
Write Disable = 2mA
250
500
mV
Power on Reset = 2mA
250
500
mV
Ie
Enable Input Current
Vi = 2.4V
100
A
Vi = 0.4V
–200
A
Ip
Input Current at Park
Vi = 2.4V
100
A
Vi = 0.4V
–200
A
Rf
Equivalent Input Resistance at
5V Filter Input
6.9
K
Venl
Enable Low Input Voltage
0.8
V
Venh
Enable High Input Voltage
2
V
Vph
Parking Input High Voltage
2
V
Vpl
Parking Input Low Voltage
0.8
V
Vpfl
Power Fail Low Output Voltage
Il = 2mA
0.5
V
Iprog
Parking Voltage Program Current
100
A
Ich
Power On Reset Delay
Capacitor Charging
10
A
Td
Delay Between Write Disable
and Power on Reset Falling
Edges
410
s
L6243-L6243D
5/12
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