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參數(shù)資料
| 型號： | A8936CJT |
| 廠商： | Allegro MicroSystems, Inc. |
| 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： | 音圈電機驅(qū)動 |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 102K |
| 代理商： | A8936CJT |
8936
VOICE COIL MOTOR DRIVER
"JT" Term."LW" Term. Term. Name
Function
25
1
RET REF
The reference supply for setting the voltage across the load during retract.
27
2
V
FLT
Reservoir (energy storage) capacitor used to operate fault circuitry.
28
3
V
BEMF
Back-EMF voltage from spindle motor used to retract heads during loss of power.
30
4
GROUND
Circuit reference.
33
5
UV
SET
Under-voltage trip point reference input. Set internally to 4.3 V but may be over-ridden by external
resistor divider. (Equation 4).
34
6
R
OUT P
Source driver used for retract; externally connected to OUT
P
.
35
7
OUT
Output of uncommitted operational amplifier.
36
8
EN VEL FLT
Logic input for over-velocity fault latch.
45
9
IN
N
Inverting input to uncommitted operational amplifier.
46
10
VEL
IN
Analog voltage input corresponding to motor speed.
47
11
RETRACT
An active-low logic input that initiates the retract sequence.
50
12
FAULT
A logic low at this MOS output indicates a thermal shutdown, under-voltage fault, or retract command.
51
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.
53
14
SIGNAL SUPPLY
V
CC
; low-current supply voltage in the range of 4.5 V to 5.5 V.
55
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).
58
16
REFERENCE V
REF
; reference input for all amplifiers; ac ground.
60
17
H GAIN
Logic input to switch the error amplifier transconductance gain: LOW = 2100, HIGH = 8400.
62
18
PWR OFF
An active-high logic input that puts the device in a
“
sleep mode
”
. All fault circuitry remains active.
1
19
ACT
FB
Input connection for feedback network which sets the error amplifier gain and bandwidth.
2
20
SGND
P
Power ground for the OUT
P
sink driver.
4
21
OUT
N
Power output. Sinks current when V
ACT
< V
REF
.
8
22
LOAD SUPPLY V
DD
; high-current supply voltage for the voice-coil motor.
13
23
OUT
P
Power output. Sinks current when V
ACT
> V
REF
.
15
24
SGND
N
Power ground for the OUT
N
sink driver.
16
25
V
SENS FB
Input connection for feedback network which sets the current-sense amplifier gain and bandwidth.
Also called gm SET.
19
26
VEL FLT
An active-low logic output indicating an over-velocity fault.
21
27
V
SENS
Voltage output representing load current (Equation 2). Also called MONITOR.
23
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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| A92-TO-92 | TRANSISTOR（ PNP ） |
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