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参数资料
| 型号： | 8932-A |
| 厂商： | Allegro MicroSystems, Inc. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | VOICE-COIL MOTOR DRIVER |
| 中文描述： | 音圈电机驱动 |
| 文件页数： | 5/8页 |
| 文件大小： | 164K |
| 代理商： | 8932-A |
8932-A
VOICE-COIL MOTOR DRIVER
www.allegromicro.com
Term.
Terminal Name
Function
1
RET REF
The reference supply for setting the voltage across the load during retract.
2
V
FLT
Reservoir (energy storage) capacitor used to operate fault circuitry.
3
V
BEMF
Back-EMF voltage from spindle motor used to retract heads during loss of power.
4
GROUND
Circuit reference.
5
UV
SET
Under-voltage trip point reference input. Set internally to 4.2 V but may be overridden by
external resistor divider. (Equation 4).
6
R
OUT P
Source driver used for retract; externally connected to OUT
P
.
7
OUT
Output of uncommitted operational amplifier.
8
SWITCH
Logic input for transmission gate; a high level connects OUT to OUT
SW
.
9
IN
N
Inverting input to uncommitted operational amplifier.
10
OUT
SW
Transmission-gated output of uncommitted operational amplifier.
11
RETRACT
An active-low logic input that initiates the retract sequence.
12
FAULT
A logic low at this MOS output indicates a thermal shutdown, under-voltage fault, or retract
command.
13
MP
RESET
(Power-On Reset) A logic low at this open-collector output may be used to reset the
system on under-voltage fault or power on.
14
SIGNAL SUPPLY
V
CC
; low-current supply voltage in the range of 4.5 V to 5.5 V.
15
ACT
Input which controls the current in the load. Transconductance gain is set with an external
resistor in series with this input (Equation 1).
16
REFERENCE
V
REF
; reference input for all amplifiers; ac ground.
17
H GAIN
Logic input to switch the error amplifier transconductance gain: LOW = 2000,
HIGH = 8000.
18
PWR OFF
An active-high logic input that puts the device in a
“
sleep mode
”
.
All fault circuitry remains active.
19
ACT
FB
Input connection for feedback network which sets the error amplifier gain and bandwidth.
20
SGND
P
Power ground for the OUT
P
sink driver.
21
OUT
N
Power output. Sinks current when V
ACT
< V
REF
.
22
LOAD SUPPLY
V
DD
; high-current supply voltage for the voice-coil motor.
23
OUT
P
Power output. Sinks current when V
ACT
> V
REF
.
24
SGND
N
Power ground for the OUT
N
sink driver.
25
V
SENS FB
Input connection for feedback network which sets the current-sense amplifier gain and
bandwidth. Also called gm SET.
26
V
LOAD
An output voltage proportional to the load voltage. Used in conjunction with closed-loop
velocity control.
27
V
SENS
Voltage output representing load current (Equation 2). Also called MONITOR.
28
RET SET
An external resistor divider to set the retract voltage across the load. Used in conjunction
with V
RET-REF
(Equation 3).
TERMINAL FUNCTIONS
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