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دیتاشیت - Allegro MicroSystems - VOICE COIL MOTOR DRIVER

شماره قطعه 8936
شرح مفصل VOICE COIL MOTOR DRIVER
تولید کننده Allegro MicroSystems 
آرم Allegro MicroSystems 


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8936 شرح
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.

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شماره قطعه شرح مفصل تولید کنندگان
8932-A VOICE-COIL MOTOR DRIVER Allegro MicroSystems
Allegro MicroSystems
8936 VOICE COIL MOTOR DRIVER Allegro MicroSystems
Allegro MicroSystems

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