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参数资料
| 型号： | 8980 |
| 厂商： | Allegro MicroSystems, Inc. |
| 英文描述： | SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER |
| 中文描述： | SUPERSERVO主轴 |
| 文件页数： | 3/8页 |
| 文件大小： | 81K |
| 代理商： | 8980 |
8980
S
UPER
S
ERVO
SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
Notch Filter.
This notch filter has a programmable center
frequency and programmable notch depth to provide truly independent
control of notch damping. Enough range and granularity are provided
to allow versatile and accurate out-of-band attenuation of undesirable
energy sources.
Actuator Transconductance Amplifier.
The final trans-
conductance function of the voice-coil actuation signal path is
achieved by monitoring the load current and generating an error
voltage to drive a local g
m
amplifier control loop. The error voltage is
scaled by an external precision resistor (R
gm(act)
). This resistor does
not carry load current and is intended only for accurate determination
of the transconductance. The function is:
g
m(act)
= 5800
R
gm(act)
and I
OUT
= V
SERVO
g
m(ACT)
.
Actuator Power Outputs.
The voice-coil output driver is a
full-bridge power driver operating in a class-B mode. The power
output devices are enhancement-mode MOS transistors. Special
internal circuitry results in nearly zero cross-over distortion when
switching from one source/sink pair to another.
FUNCTIONAL DESCRIPTION
ACTUATOR
Servo-Demand DAC.
A 12-bit DAC
is provided to bridge the DSP
“
soft
”
domain
to the analog hardware domain. The term
“
demand
”
refers to the distinction between
the newly requested voice-coil current and
the prior current being supplied. The DAC,
operating in straight binary format, spans the
full dynamic range between a large signal
velocity and a precision position mode. The
DAC output is updated synchronously with
the notch functions to avoid the creation of
aliasing products.
Low-Pass Filter.
This double, non-
intrinsic complex-pole low-pass filter is
provided to attenuate undesirable, out-of-
band information. The input of this discrete
time filter is sampled synchronously with the
12-bit DAC and notch function in order to
avoid aliasing products.
VM
VBOOST(H)
VBOOST(L)
VDC M
UNDER-VOLTAGE
FAULT
VBOOST(H)
VBOOST(L)
SPINDLE
MOTOR DRIVERS
VBOOST(H)
VBOOST(L)
VOICE-COIL
DRIVER
TRIP ADJ
POWER
ON
RESET
POR
OUT
REF(x2)
V
REF
V
REFERENCE
ADJUST
VBOOST(L)
VBOOST(L)
ADJUST
(FROM SERIAL INTERFACE)
V
VBOOST(L)
TJ
SHUTDOWN /
SLEEP
CC(A)
V
CC(A)
VCC(D)
VCC(PWR)
CC(A)
V
V
LFLYBACK
CC(A)
V
BG
BG
V
BG
V
VDC
OVER -
VELOCITY
FAULT
RETRACT
MODE
VCC(A)
V +
V
REF
2
V
REF
2
VEL
FILTERED
V
V -
VCC(D)
VRETRACT
BG
V
ADJUST
(FROM SERIAL
INTERFACE)
x2
÷
2
BANDGAP
VOLTAGE
REFERENCE
DC-TO-DC
CONVERTER
THERMAL
FAULT
RETRACT
VOLTAGE
REFERENCE
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