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A8904SLB-T Datasheet

  • A8904SLB-T

  • 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER WITH BACK-EMF S...

  • 18頁

  • ALLEGRO   ALLEGRO

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8904
A8904SLB
(SOIC)
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
The A8904SLB and A8904SLP are three-phase brushless dc motor
controller/drivers designed for applications where accurate control of high-
speed motors is required. The three half-bridge outputs are low on-resistance
n-channel DMOS devices capable of driving up to 1.2 A. The A8904 provides
complete, reliable, self-contained back-EMF sensing, motor startup and
running algorithms. A programmable digital frequency-locked loop speed
control circuit together with the linear current control circuitry provides
precise motor speed regulation.
A serial port allows the user to program various features and modes of
operation, such as the speed control parameters, startup current limit, sleep
mode, direction, and diagnostic modes.
The A8904 is fabricated in Allegro鈥檚 BCD (Bipolar CMOS DMOS)
process, an advanced mixed-signal technology that combines bipolar, analog
and digital CMOS, and DMOS power devices. The A8904SLB is provided in
a 24-lead wide-body SOIC batwing package. The A8904SLP is provided in a
thin (<1.2 mm), 28-lead SSOP package with an exposed thermal pad. Each
package type is available in a lead-free version (100% matte tin leadframe).
Data Sheet
26301.5B
Absolute Maximum Ratings
Load Supply Voltage, V
BB
. . . . . . . . . . . .
15 V
Output Current
1
, I
OUT . . . . . . . . . . . . . . . . . . . . .
鹵1.4 A
Peak Output Current (Brake)
2
, I
OUT(BRK)
.
鹵3.0 A
Period
2
for I
OUT(BRK)
to fall from
鹵3.0 A to 鹵1.4 A . . . . . . . . . . . . . . .
800 ms
Logic Supply Voltage, V
DD
. . . . . . . . . . .
7.0 V
Logic Input Voltage Range, V
IN
(continuous) . . . . . .
-0.3 V to V
DD
+ 0.3 V
(t
w
<30 ns) . . . . . . .
-1.0 V to V
DD
+ 1.0 V
Package Power Dissipation, P
D
. .
See Graph
Operating Temperature, T
A
. . .
-20擄C to +85擄C
Junction Temperature
3
, T
J
. . . . . . . . .
+150擄C
Storage Temperature,T
S
. . . .
-55擄C to +150擄C
1
Output
Features
Pin-for-pin replacement for A8902CLBA
Startup commutation circuitry
Sensorless commutation circuitry
Option of external sector data tachometer signal
Option of external speed control
Oscillator operation up to 20 MHz
Programmable overcurrent limit
Transconductance gain options: 500 mA/V or 250 mA/V
Programmable watchdog timer
Directional control
Serial Port Interface
TTL-compatible inputs
System diagnostics data out ported in real time
Dynamic braking through serial port or external terminal
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.
2
Peak output current is a transient condition that
occurs during braking when the motor acts as a
generator. The 3 A level is based on the maximum
peak of a sine wave that is damped. The maximum
period between the initial brake being applied and the
current through the drivers falling to 1.4 A should not
exceed 800 ms. See Braking section for more
information.
3
Fault conditions that produce excessive junction
temperature will activate device thermal shutdown
circuitry. These conditions can be tolerated, but should
be avoided.
Always order by complete part number:
Part Number
A8904SLB
A8904SLB-T
A8904SLP
A8904SLP-T
Package
24-pin batwing SOIC
24-pin batwing SOIC; Lead-free
28-pin SSOP with Exposed Thermal Pad
24-pin SSOP with Exposed Thermal Pad; Lead-free

A8904SLB-T 產(chǎn)品屬性

  • 31

  • 集成電路 (IC)

  • PMIC - 電機和風扇控制器，驅(qū)動器

  • -

  • DC 電機驅(qū)動器，無刷（BLDC），3 相

  • -

  • 1

  • ±1.4A

  • 4 V ~ 14 V

  • 4.5 V ~ 5.5 V

  • -20°C ~ 85°C

  • 表面貼裝

  • 24-SOIC（0.295"，7.50mm 寬）

  • 24-SOIC W

  • 管件

  • 620-1103

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