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A8925CEB Datasheet Preview

A8925CEB Datasheet

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH LINEAR CURRENT CONTROL AND POWER DMOS OUTPUTS

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8925
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
8925WITH LINEAR CURRENT CONTROL
AND POWER DMOS OUTPUTS
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
storage applications. The power output stages are capable of ±4 A
POWER 7
39 POWER
output currents and have DMOS power outputs with less than 0.25
GROUND
GROUND
8
9
10
11
T12
C13
14
U15
D Y16
LPOWER 17
GROUND
SUB
+
38
37
36
35
34
33
32
31
30
29 POWER
GROUND
SUB
PRO ONDwg.PP-034
ED CEABSOLUTE MAXIMUM RATINGS
U NAT TA = +25°C
Load Supply Voltage, VBB ..................... 14 V
IN EOutput Current, IOUT .......................... ±4.0 A
RLogic Supply Voltage, VCC .....................14 V
Logic Input Voltage Range,
T EVIN ................................ -0.3 V to +6.0 V
N FPackage Power Dissipation,
PD ......................................... See Graph
O EOperating Temperature Range,
TA ..................................... 0°C to +70°C
C RJunction Temperature, TJ ............... +150°C†
Storage Temperature Range,
IS RTS ................................ -55°C to +150°C
D O† Fault conditions that produce excessive
junction temperature will activate device thermal
Fshutdown 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.
rDS(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
s DMOS Outputs
s Low rDS(on) - 0.25 Maximum
s Linear Current Control
s Internal Commutation Circuitry
s Internal Current Sensing
s Thermal Shutdown Circuitry
s Under Voltage Detection Circuitry
s Fault Output Flag
s Power Surface-Mount Package
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.
Always order by complete part number: A8925CEB .




Allegro MicroSystems

A8925CEB Datasheet Preview

A8925CEB Datasheet

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH LINEAR CURRENT CONTROL AND POWER DMOS OUTPUTS

No Preview Available !

8925
3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
WITH LINEAR CURRENT CONTROL
AND POWER DMOS OUTPUTS
12.5
10
7.5
5.0
2.5
R
θJA = 30°C/W
0
25
50 75 100
TEMPERATURE IN °C
125 150
Dwg. GP-020B
ELECTRICAL CHARACTERISTICS AT TA = +25°C, VCC = VBB = 12 V
Characteristic
Logic Supply Voltage
Load Supply Voltage
Supply Current
Thermal Shutdown
Output Drivers
Output ON Resistance
Output Sustaining Voltage
Clamp Diode Forward Voltage
Output Leakage Current
Control Logic
Logic Input Voltage
Logic Input Voltage
Logic Input Current
Symbol
VCC
VBB
ICC
TJ
Test Conditions
Operating
Operating
Operating
VENABLE = 0 V
rDS(on)
VDS(sus)
VF
IDSX
IOUT = ±4.0 A, Pulse Test
IOUT = 4.0 A, L = 2 mH
IF = ±4.0 A
VOUT = 14 V
VOUT = 0 V
VIN(0)
VIN(1)
VIN(0)
VIN(1)
IIN(0)
IIN(1)
ENABLE, POLE
BRAKE
VIN = 0.8 V
VIN = 2.4 V
NOTE: Negative current is defined as coming out of (sourcing) the specified device terminal.
Min.
10
10
14
2.4
3.0
Limits
Typ.
Max.
12 14
12 14
30 50
2.0 4.0
165
Units
V
V
mA
mA
°C
0.20 0.25
——
1.5 2.0
10 300
-10 -300
V
V
µA
µA
0.8
V
—— V
0.8
V
—— V
-1.0 µA
1.0 µA
Continued next page...
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1990, 1995 Allegro MicroSystems, Inc.


Part Number A8925CEB
Description 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH LINEAR CURRENT CONTROL AND POWER DMOS OUTPUTS
Maker Allegro MicroSystems
Total Page 8 Pages
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