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參數(shù)資料
| 型號(hào)： | L6243DS |
| 廠商： | 意法半導(dǎo)體 |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | VOICE COIL MOTOR DRIVER |
| 中文描述： | 音圈電機(jī)驅(qū)動(dòng) |
| 文件頁數(shù)： | 7/12頁 |
| 文件大小： | 113K |
| 代理商： | L6243DS |
BLOCK DESCRIPTION
OUTPUT STAGE
It consists of two Power Op Amps connected in
bridge configuration.
CURRENT SENSEAMPLIFIER
Differential amplifier whose inputs are connected
to the sense lines and whose output is accessible
externally. Closing the loop will transform the
differentialvoltage signalfrom thesense lines into
a currentsignal for the Error Amplifier.
ERROR AMPLIFIER
Error amplifier which drives the output stage. The
input and the output pins are accessible exter-
nally.
POWERSUPPLY MONITOR OPERATION
The circuit monitors the logic supply voltage input
(typ 5V) and activates Power on Reset and Write
Disable output when such a supply drops below
the safe operating limit. After the logic supply volt-
age reaches its nominal value a delay capacitor
has to be charged [Tdelay=3x10e5 x C sec] be-
fore Power on Reset and Write Disable outputs
change from low to high level. Falling edges of
Write Disable and Power on Reset are delayed
(typ 4
μ
s) in orderto disable the writing on the disk
before the Power on Reset is activated. An addi-
tional supervisor circuit is presentin the IC with a
programmablethreshold, which is set by an exter-
nal resistive divider. The TTL compatible output
can be used separately or connected to Park in-
put in orderto park the head.
The V
CC
sense output pin can also be connected
to 5V filter input in order to implement a POWER
ON RESET function sensitive both to 5V and V
CC
.
PARKING CIRCUIT OPERATIONT
The voice coil driver is switched into the parking
conditionwhen Power on Reset output or Park in-
put are low. In such a condition a fixed voltage is
superimposedon the load and the value of such a
voltage is set by connecting an external resistor
between
Park
Voltage
ground: (Vpark=Rext x Iref, Iref=100
μ
A typ). Con-
necting ENABLE input to GND the driver will be
disabled (outputs in high impedancemode).
Program
input
and
THERMAL SHUTDOWN
It will disable the IC when the junction tempera-
ture exceedsthe threshold value above which the
device could be damaged.
Figure 1:
ApplicationCircuit(The pinoutrefers to the L6243)
L6243-L6243D
7/12
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