COMP.
...........
(peak) ..........
(continuous) ...........................
...................................
...............................
........................................
.....................................
..............
鈥?/div>
Storage Temperature Range,
T
S
................................ -55
擄
C to +150
擄
C
鈥?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.
T
C
U Y
D L
O N
R O
P E
D C
E N
U E
IN ER
T F
N E
O R
C R
IS O
D F
鈥?/div>
V
REF
6
7
8
Providing control and drive of the voice coil motor used for head
positioning in 5 V disk drive applications, the A8936C鈥?is a full-bridge
driver which 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. An under- or over-velocity sense disables the
system in a controlled sequence if a fault condition occurs.
The two
鹵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.
+
V
REF
鈥?/div>
V
DD
22
LOAD
SUPPLY
OUT
N
21
20
9
SGND
P
ACT
FB
10
19
18
17
16
11
PWR OFF
H GAIN
12
PROTECT
CIRCUIT
13
14
V
CC
+
鈥?/div>
REFERENCE
ACT
15
FEATURES
s
s
s
s
s
s
s
s
s
s
s
Dwg. PP-046A
MAXIMUM
RATINGS
Over-Velocity Fault Function
Lossless Current Sensing
Zero Deadband
High Transconductance Bandwidth
User-Adjustable Transconductance Gain
Digital Transconductance Gain Switch (4:1 Ratio)
5 Volt Monitor with Selectable UV Trip Point
Retract Circuitry Functional to 0 Volts
Chip Enable/Sleep Mode Function
1 V at 500 mA Output Saturation Voltage
Internal Thermal Shutdown Circuitry
Always order by complete part number:
Part Number Package
A8936CJT
A8936CLW
64-Lead Thin Quad Flatpack
28-Lead SOIC
A
TM
MicroSystems, Inc.
1
2
3
4
5
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7
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