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Allegro MicroSystems

A8904 Datasheet Preview

A8904 Datasheet

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER

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A8904
3-Phase Brushless DC Motor Controller/Driver
with Back EMF Sensing
Features and Benefits
Pin-for-pin replacement for A8902CLBA
Start-up 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
Packages:
Not to scale
28-pin TSSOP
with exposed thermal pad
(Package LP)
24-pin SOICW
with internally fused pins
(LB package)
Description
The A8904 is a 3-phase brushless DC motor controller/driver
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 1.2A. TheA8904 provides complete, reliable, self-contained
back EMF sensing, motor start-up, 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,
start-up current limit, sleep mode, direction, and diagnostic
modes.
The A8904 is fabricated in the Allegro® BCD (Bipolar CMOS
DMOS) process, an advanced mixed-signal technology that
combines bipolar, analog, and digital CMOS, with DMOS
power devices.
The device is provided in a 24-pin wide-body SOIC package,
with 4 internally-fused leads for enhanced thermal dissipation
(package LB), and a thin (<1.2 mm overall height), 28-pin
TSSOP package with an exposed thermal pad Package LP).
Both packages are lead (Pb) free, with 100% matte tin leadframe
plating.
Functional Block Diagram
LOGIC
SUPPLY
C D1
C D2 C ST BRAKE
C RES
OUT A
OUT B
CENTERTAP
OUTC
VDD
BRAKE
FCOM COMMUTATION
DELAY
START-UP
OSC.
BLANK
BOOST
CHARGE
PUMP
VBB
C WD
SECTOR
DATA
OSC
FREQUENCY-
LOCKED LOOP
WATCHDOG
TIMER
CHARGE
PUMP
CURRENT
CONTROL
RS
DATA IN
SERIAL PORT
MUX
TSD
LOAD
SUPPLY
OUT A
OUT B
OUTC
GROUND
GROUND
26301.5H
CHIP CLOCK RESET DATA OUT
SELECT
FILTER




Allegro MicroSystems

A8904 Datasheet Preview

A8904 Datasheet

3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER

No Preview Available !

A8904
3-Phase Brushless DC Motor Controller/Driver
with Back EMF Sensing
Selection Guide
Part Number
A8904SLBTR-T
A8904SLPTR-T
Package
24-pin SOIC
28-pin TSSOP
Packing
450 per reel
4000 per reel
Absolute Maximum Ratings
Characteristic
Load Supply Voltage
Logic Supply Voltage
Logic Input Voltage Range
Output Current
Peak Output Current (Brake)
IOUT(BRK) Period
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VBB
VDD
VIN
IOUT
IOUT(BRK)
tfIOUT(BRK)
TA
TJ(max)
Tstg
Notes
Continuous
tw < 30 ns
Output current rating may be restricted to a val-
ue determined by system concerns and factors.
These include: system duty cycle and timing,
ambient temperature, and use of any heatsink-
ing and/or forced cooling. For reliable operation,
the specied maximum junction temperature
should not be exceeded.
Fall of IOUT(BRK) from ±3.0 A to ±1.4 A
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 maxi-
mum peak of a sine wave that is damped. The
maximum period between the initial brake being
applied and the current through the drivers fall-
ing to 1.4 A should not exceed 800 ms. See the
Braking section for more information.
Range S
Fault conditions that produce excessive junc-
tion temperature will activate device thermal
shutdown circuitry. These conditions can be
tolerated, but should be avoided.
Rating
15
7
–0.3 to VDD + 0.3
–1.0 to VDD + 1.0
±1.4
±3.0
800
–20 to 85
150
–55 to 150
Units
V
V
V
V
A
A
A
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A8904
Description 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
Maker Allegro MicroSystems
Total Page 18 Pages
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