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參數(shù)資料
| 型號(hào)： | 8925 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH LINEAR CURRENT CONTROL AND POWER DMOS OUTPUTS |
| 中文描述： | 3相無(wú)刷直流電動(dòng)機(jī)控制器/驅(qū)動(dòng)器，線性電流控制和電源DMOS輸出 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大?。?/td> | 86K |
| 代理商： | 8925 |
8925
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
WITH LINEAR CURRENT CONTROL
AND POWER DMOS OUTPUTS
DSCONINUEDPRODUC
Under Voltage Detection Circuitry
I
Fault Output Flag
I
Power Surface-Mount Package
tolerated, but should be avoided.
—FORREERENCEONY
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.
POWER
GROUND
6
5
4
3
2
1
4
4
4
4
4
7
8
9
10
11
12
13
14
15
16
17
29
30
39
38
37
36
35
34
33
32
31
2
2
2
2
2
2
2
2
2
1
1
VC
POWER
GROUND
POWER
GROUND
POWER
GROUND
VB
A
VS
B
H1
H3
H2
L
A
B
OC
SUB
SUB
+
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
WITH LINEAR CURRENT CONTROL
AND POWER DMOS OUTPUTS
The A8925CEB is a DMOS three-phase brushless dc motor con-
troller/driver designed for use in Winchester disk drives and other data
±
4 A
output currents and have DMOS power outputs with less than 0.25
r
DS(on)
for low power dissipation. Intrinsic ground clamp and flyback
diodes protect the output drivers when switching inductive loads.
Thermal shutdown circuitry is provided to protect the device from ex-
cessive junction temperature.
A transconductance amplifier is used to linearly regulate the load
current and control motor speed. Internal current-sensing circuitry
eliminates the need for external sense resistors. Analog and digital
control circuitry provide complete sequencing of the output drivers as
well as providing brake, disable, and tachometer functions. A FAULT
output flag indicates the presence of an under-voltage condition on the
12 V supply, excessive junction temperature, or an invalid Hall input
combination. The A8925CEB’s commutation logic is compatible with
motors that have digital Hall-effect sensors with 120
°
of electrical
separation. Internal charge pump circuitry is provided to drive the N-
channel DMOS source drivers to their required gate voltages.
The A8925CEB is provided in a 44-lead PLCC power package for
surface-mount applications. The copper batwing provides for maxi-
mum allowable package power dissipation in the smallest possible
construction.
FEATURES
I
DMOS Outputs
I
Low r
DS(on)
- 0.25
Maximum
I
Linear Current Control
I
Internal Commutation Circuitry
I
Internal Current Sensing
I
Thermal Shutdown Circuitry
Always order by complete part number:
A8925CEB
.
ABSOLUTE MAXIMUM RATINGS
AT T
A
= +25
°
C
Load Supply Voltage, V
BB
.....................
14 V
Output Current, I
OUT
..........................
±
4.0 A
Logic Supply Voltage, V
CC
.....................
14 V
Logic Input Voltage Range,
V
IN
................................
-0.3 V to +6.0 V
Package Power Dissipation,
P
D
.........................................
See Graph
Operating Temperature Range,
T
A
.....................................
0
°
C to +70
°
C
Junction Temperature, T
J
...............
+150
°
C
Storage Temperature Range,
T
S
................................
-55
°
C to +150
°
C
Fault conditions that produce excessive
junction temperature will activate device thermal
shutdown circuitry. These conditions can be
Output current rating may be restricted to a value
Dwg. PP-034
D
2
8925
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