|
|
PDF 8932-A Data sheet ( Hoja de datos )
| Número de pieza | 8932-A | |
| Descripción | VOICE-COIL MOTOR DRIVER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de 8932-A (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
8932-A
RET REF 1
28 RET SET
V FLT 2
V BEMF 3
GROUND 4
PROTECT
CIRCUIT
–
+
UV SET 5
R OUT P 6
OUT 7
SWITCH 8
IN N 9
OUTSW 10
RETRACT 11
–+
V REF – +
2V
27 VSENS
26 V LOAD
25 V SENS FB
24 SGND N
23 OUTP
VDD 22
LOAD
SUPPLY
21 OUT N
20 SGND P
19 ACT FB
18 PWR OFF
FAULT 12
MP RESET 13
PROTECT
CIRCUIT
SIGNAL
SUPPLY
14
V CC
17 H GAIN
+ 16 REFERENCE
– 15 ACT
Dwg. PP-042B
ABSOLUTE MAXIMUM RATINGS
Supply Voltages, VCC and VDD ............ 6.0 V
Output Current, IOUT (peak) ........... ±600 mA
(continuous) ........................... ±500 mA
Analog Input Voltage Range,
VIN .................................... -0.3 V to VCC
Logic Input Voltage Range,
VIN ............................... -0.3 V to +6.0 V
Package Power Dissipation,
PD ......................................... See Graph
Operating Temperature Range,
TA ..................................... 0°C to +70°C
Junction Temperature, TJ ............... +150°C†
Storage Temperature Range,
TS ................................ -55°C to +150°C
† Fault conditions that produce excessive junction
temperature will activate device thermal shutdown
circuitry. These conditions can be tolerated, but
should be avoided.
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. For reliable operation the
specified maximum junction temperature should
not be exceeded.
VOICE-COIL MOTOR DRIVER
Providing control and drive of the voice-coil motor used for head
positioning in 5 V disk drive applications, the second-generation
A8932CLWA is a full-bridge driver that can be configured so that its
output current is a direct function of an externally applied control
voltage or current. This linear current control function is supplemented
by additional circuitry to protect the heads and the data disk during
system failure or normal system shutdown.
The two ±500 mA MOS driver outputs provide very low saturation
voltage and minimal power dissipation. Additional headroom is
achieved by the sense-FET structure eliminating the need for an exter-
nal current-sense resistor. Internal circuitry can be configured to
provide closed-loop velocity control of the actuator by utilizing the
generated back-EMF of the voice-coil motor. Thermal protection and
under-voltage lockout disables the system in a controlled sequence if a
fault condition occurs.
FEATURES
I
Class-B,
2
Ω
r
DS(on)
at
500
mA
Output
I Lossless Current Sensing
I Zero Current-Loop Deadband
I High Transconductance Bandwidth
I User-Adjustable Transconductance Gain
I Digital Transconductance Gain Switch (4:1 Ratio)
I 5 Volt Monitor with Selectable UV Trip Point
I Retract Circuitry Functional to 0 Volts
I Sleep Mode Function
I Internal Back-EMF Velocity Loop Option
I Internal Thermal Shutdown Circuitry
Always order by complete part number, e.g., A8932CLWA .
1 page  
8932-A
VOICE-COIL MOTOR DRIVER
TERMINAL FUNCTIONS
Term.
1
2
3
4
5
Terminal Name
RET REF
VFLT
VBEMF
GROUND
UVSET
6 ROUT P
7 OUT
8 SWITCH
9 INN
10 OUTSW
11 RETRACT
12 FAULT
13 MPRESET
14 SIGNAL SUPPLY
15 ACT
16 REFERENCE
17 H GAIN
18 PWR OFF
19 ACTFB
20 SGNDP
21 OUTN
22 LOAD SUPPLY
23 OUTP
24 SGNDN
25 VSENS FB
26 VLOAD
27 VSENS
28 RET SET
Function
The reference supply for setting the voltage across the load during retract.
Reservoir (energy storage) capacitor used to operate fault circuitry.
Back-EMF voltage from spindle motor used to retract heads during loss of power.
Circuit reference.
Under-voltage trip point reference input. Set internally to 4.2 V but may be overridden by
external resistor divider. (Equation 4).
Source driver used for retract; externally connected to OUTP.
Output of uncommitted operational amplifier.
Logic input for transmission gate; a high level connects OUT to OUTSW.
Inverting input to uncommitted operational amplifier.
Transmission-gated output of uncommitted operational amplifier.
An active-low logic input that initiates the retract sequence.
A logic low at this MOS output indicates a thermal shutdown, under-voltage fault, or retract
command.
(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.
VCC; low-current supply voltage in the range of 4.5 V to 5.5 V.
Input which controls the current in the load. Transconductance gain is set with an external
resistor in series with this input (Equation 1).
VREF; reference input for all amplifiers; ac ground.
Logic input to switch the error amplifier transconductance gain: LOW = 2000,
HIGH = 8000.
An active-high logic input that puts the device in a “sleep mode”.
All fault circuitry remains active.
Input connection for feedback network which sets the error amplifier gain and bandwidth.
Power ground for the OUTP sink driver.
Power output. Sinks current when VACT < VREF.
VDD; high-current supply voltage for the voice-coil motor.
Power output. Sinks current when VACT > VREF.
Power ground for the OUTN sink driver.
Input connection for feedback network which sets the current-sense amplifier gain and
bandwidth. Also called gm SET.
An output voltage proportional to the load voltage. Used in conjunction with closed-loop
velocity control.
Voltage output representing load current (Equation 2). Also called MONITOR.
An external resistor divider to set the retract voltage across the load. Used in conjunction
with VRET-REF (Equation 3).
www.allegromicro.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet 8932-A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 8932-A | VOICE-COIL MOTOR DRIVER | Allegro MicroSystems |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |