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參數(shù)資料
| 型號(hào)： | 8980 |
| 廠(chǎng)商： | Allegro MicroSystems, Inc. |
| 英文描述： | SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER |
| 中文描述： | SUPERSERVO主軸 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 81K |
| 代理商： | 8980 |
8980
S
UPER
S
ERVO
SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
DISCONTINUED PRODUCT
FEATURES
T
A
.....................................
0
°
C to +70
°
C
— FOR REFERENCE ONLY
I
Zero Deadband
I
User-Adjustable Transconductance Gain
I
Retract Circuitry Functional to 0 V
Dwg. PP-048
V
V
REF(X2)
SER DATA IN
C
12
ADJUST
8
VOLTAGE REF.
SPIN-DEMAND
COBACK-EMF and
SERVO CONTROL
M
Dwg. PP-048
S
UPER
S
ERVO
ACTUATION MANAGER/DRIVER
TM
SPINDLE & VOICE-COIL
Voice Coil Motor Driver:
I
Low r
DS(on)
MOS Outputs
I
Lossless Current Sensing
The A8980CJT provides complete drive, management, and control
of the voice-coil and spindle motor power actuation subsystems used
in hard disk drives. Extensive programmable control features and
system diagnostics are provided via a serial interface under the
direction of an external microcontroller. The large-scale integration
and use of advanced DABiC
(digital/analog-BiCMOS) merged
technologies results in minimum power dissipation, minimum operating
voltage requirements, and minimum external components.
driver and a back-EMF sensing motor commutation scheme. Internal
logic and analog circuitry provide complete start-up and
μ
C-assisted
run modes without the need for snubbers or other external compo-
nents. Additional headroom is achieved by a proprietary circuit, which
eliminates the need for an external current-sense resistor. Intrinsic
ground clamp and flyback diodes are also provided.
The voice-coil function contains a 12-bit DAC, tunable low-pass
and notch filters, and a full-bridge power driver. The MOS outputs
provide increased available voltage and lower power dissipation over
bipolar devices. Voice-coil current is sensed by internal circuitry that
eliminates the need for an external current-sense resistor. Additional
internal circuitry can be configured to provide an over-velocity fault
limit by utilizing the internally monitored current of the voice-coil motor.
The spindle and voice-coil control functions are supplemented by
an E
NERGY
M
ANAGER
subsystem, which efficiently channels available
power to protect the heads and the data disk during system failure or
normal system shutdown. Synchronous rectification of spindle
back-EMF voltage provides nearly lossless conversion of spindle
rotational inertia into power to operate the voice coil motor for parking
the heads. A dc-to-dc converter provides continuous operation at
minimum supply voltages. In addition, the E
NERGY
M
ANAGER
subsystem
provides several sleep modes and latched fault states for undervoltage
or thermal faults.
The A8980CJT is supplied in a 64-lead thin quad flatpack for
surface-mount applications.
Output current rating may be restricted to a value
determined by system concerns and factors.
These include: system duty cycle and timing,
ambient temperature, and use of any heatsinking
and/or forced cooling.
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25
°
C
Load Supply Voltage, V
CC(PWR)
..........
7.0 V
Spindle Output Current, I
OUT(S)
.........
±
1.6 A
Voice-Coil Output Current, I
....
±
0.9 A
Output Current, I
OUT(S)
......................
±
1.6 A
Logic Supply Voltage V
CC(D)
...............
6.0 V
D
2
8980
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