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參數(shù)資料
| 型號： | A8932 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Voice-Coil Motor Driver(音頻線圈電機(jī)驅(qū)動(dòng)器) |
| 中文描述： | 語音線圈電動(dòng)機(jī)驅(qū)動(dòng)器（音頻線圈電機(jī)驅(qū)動(dòng)器） |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 164K |
| 代理商： | A8932 |
8932-A
VOICE-COIL MOTOR DRIVER
www.allegromicro.com
Retract and Brake.
A retract-brake sequence is initiated
on receiving a fault indication from the internal thermal
shutdown (TSD), or under-voltage lockout (UVLO), or an
externally applied logic High at the RETRACT input.
If the velocity control scheme is implemented, the
head can be retracted under the full control of V
in
conjunction with OUT
back-EMF voltage if no fault
condition exists. If a fault condition were to occur how-
ever, the retract velocity would be controlled by applying a
constant user-defined voltage across the load:
(Equation 3)
where R
7
+ R
8
>> 1000
.
When the sequence is operated, the output voltage is
forced to approximately V
to retract the heads, and
then a fault command (
“
brake
”
) is sent to the spindle
motor driver. The user determines the total time for the
retract sequence, before the spindle brake is enabled, by
the choice of an external resistor and capacitor at the
FAULT output.
Power for the retract function is provided by the
rectified back EMF of the spindle motor by way of the V
BEMF
terminal. The A8932CLWA will perform the retract func-
tion under low supply conditions (nominally down to 2 V).
Operation down to almost 0 V requires an energy-storage
capacitor at the V
FLT
terminal.
Protective Features.
The A8932CLWA has a number of
protective features incorporated into the design. Under-
voltage lockout provides system protection in the event of
reduced primary supply voltages. The under-voltage trip
point is internally set at approximately 4.2 V. It can be
user-defined with an external resistor voltage divider:
(Equation 4)
where R
5
+ R
6
<< 200 k
.
Thermal shutdown circuitry is included to protect the
device from excessive junction temperature. It is only
intended to protect the chip from catastrophic failures due
to excessive junction temperature.
2 (R
5
+ R
6
)
R
6
UV
TRIP
=
TEST CIRCUIT AND TYPICAL APPLICATION
2 R
8
1000 + R
7
+ R
8
V
RET-SET
=
+
–
VOLTAGE-SENSE
AMP
3
2
1
VOICE COIL
MOTOR
R5
RZ
+
–
+
–
+
–
H GAIN
PWR OFF
SWITCH
ERROR
AMP
POWER
AMP
–
+
POWER
CONTROL
LOGIC
PROTECTION
CIRCUITRY
CURRENT-SENSE
AMP
SENSE
–
V
REF
V
REF
V
DD
V
CC
Dwg. EP-041D
Rgm
CZ
R6
R
R
7
8
+5 V
RS
R
C2
C1
R
R
RVgm
X
VIN
X
2 V
SENSE +
I
I
TSD
RETRACT
CONTROL
V
CC
V
DD
DIODE FOR RETRACT FUNCTION
OTHERWISE SHORT TO SUPPLY
BACK EMF FROM
SPINDLE MOTOR
R
≥
200 k
R
V REF
V
REF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| A8936CJT | VOICE COIL MOTOR DRIVER |
| A8936CLW | VOICE COIL MOTOR DRIVER |
| A8958 | Voice-Coil Motor Driver(音頻線圈電機(jī)驅(qū)動(dòng)器) |
| A8983CJT | Switches; Leaded Process Compatible:Yes |
| A92 | TRANSISTOR（ PNP ） |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A8932CLW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Servo Motor Controller/Driver |
| A8932CLWA | 制造商:Allegro MicroSystems LLC 功能描述:Voice Coil Motor Driver 5V 28-Pin SMD 制造商:Allegro MicroSystems 功能描述:Voice Coil Motor Driver 5V 28-Pin SMD |
| A8932CLWATR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Industrial Control IC |
| A8936CJT | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:VOICE COIL MOTOR DRIVER |
| A8936CLW | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:VOICE COIL MOTOR DRIVER |
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