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PDF 8936 Data sheet ( Hoja de datos )
| Número de pieza | 8936 | |
| Descripción | VOICE COIL MOTOR DRIVER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 8936 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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8936
INTERIM DATA SHEET
V(SOubIjeCctEto COILchange without nMotiOceT) OR
March 16, 1993
8936DRIVER
VOICE COIL MOTOR DRIVER
A8936CLW
Providing control and drive of the voice coil motor used for head
positioning in 5 V disk drive applications, the A8936C— is a full-bridge
RET REF 1
28 RET SET
driver which can be configured so that its output current is a direct
function of an externally applied control voltage or current. This linear
V FLT 2
PROTECT
R
27 VSENS
current control function is supplemented by additional circuitry to
V BEMF 3
CIRCUIT
SQ
26 VEL FLT
protect the heads and the data disk during system failure or normal
GROUND 4
UV SET 5
TR OUTP 6
OUT 7
CEN VEL FLT 8
UINN 9
D YVELIN 10
LRETRACT 11
WINDOW
COMP.
V REF
+ VREF
–
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
O NFAULT 12
MP RESET 13
PROTECT
CIRCUIT
R OSIGNAL
SUPPLY
14
V CC
17 H GAIN
+ 16 REFERENCE
– 15 ACT
P EDwg.PP-046A
D CABSOLUTE MAXIMUM RATINGS
E NSupply Voltages, VCC and VDD ........... 6.0 V
U EOutput Current, IOUT (peak) .......... ±600 mA
(continuous) ........................... ±500 mA
IN RAnalog Input Voltage Range,
VIN ................................... -0.3 V to VCC
T ELogic Input Voltage Range,
N FVIN ............................... -0.3 V to +6.0 V
Package Power Dissipation,
O EPD ........................................ See Graph
Operating Temperature Range,
C RTA ..................................... 0°C to +70°C
Junction Temperature, TJ .............. +150°C†
IS RStorage Temperature Range,
TS ................................ -55°C to +150°C
D FO† Fault conditions that produce excessive
system shutdown. An under- or over-velocity sense disables the
system in a controlled sequence if a fault condition occurs.
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
external current-sense resistor. Thermal protection and under-voltage
lockout disables the system in a controlled sequence if a fault condi-
tion occurs.
FEATURES
s Over-Velocity Fault Function
s Lossless Current Sensing
s Zero Deadband
s High Transconductance Bandwidth
s User-Adjustable Transconductance Gain
s Digital Transconductance Gain Switch (4:1 Ratio)
s 5 Volt Monitor with Selectable UV Trip Point
s Retract Circuitry Functional to 0 Volts
s Chip Enable/Sleep Mode Function
s 1 V at 500 mA Output Saturation Voltage
s Internal Thermal Shutdown Circuitry
—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
Always order by complete part number:
determined by system concerns and factors.
These include: system duty cycle and timing,
Part Number Package
ambient temperature, and use of any heatsinking
and/or forced cooling. For reliable operation the
specified maximum junction temperature should
A8936CJT 64-Lead Thin Quad Flatpack
not be exceeded.
A8936CLW 28-Lead SOIC
A
TM
MicroSystems, Inc.
1 page  
8936
VOICE COIL MOTOR DRIVER
TERMINAL FUNCTIONS
"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
VFLT
Reservoir (energy storage) capacitor used to operate fault circuitry.
28 3
VBEMF
Back-EMF voltage from spindle motor used to retract heads during loss of power.
30 4 GROUND Circuit reference.
33 5
UVSET
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 ROUT P Source driver used for retract; externally connected to OUTP.
35 7
OUT
Output of uncommitted operational amplifier.
36 8 EN VEL FLT Logic input for over-velocity fault latch.
45 9
INN Inverting input to uncommitted operational amplifier.
46 10
VELIN
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 MPRESET (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 VCC; 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 VREF; 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
ACTFB
Input connection for feedback network which sets the error amplifier gain and bandwidth.
2 20 SGNDP Power ground for the OUTP sink driver.
4
21
OUTN
Power output. Sinks current when VACT < VREF.
8 22 LOAD SUPPLY VDD; high-current supply voltage for the voice-coil motor.
13 23
OUTP
Power output. Sinks current when VACT > VREF.
15 24 SGNDN Power ground for the OUTN sink driver.
16 25 VSENS 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
VSENS
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 VRET-REF (Equation 3).
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 8936.PDF ] | |
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