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PDF 8904 Data sheet ( Hoja de datos )

Número de pieza 8904
Descripción 3-PHASE BRUSHLESS DC MOTOR CONTROLLER/DRIVER
Fabricantes Allegro MicroSystems 
Logotipo Allegro MicroSystems Logotipo



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No Preview Available ! 8904 Hoja de datos, Descripción, Manual

8904
3-PHASE BRUSHLESS DC MOTOR
CONTROLLER/DRIVER WITH BACK-EMF SENSING
A8904SLB (SOIC)
Absolute Maximum Ratings
Load Supply Voltage, VBB . . . . . . . . . . . . 15 V
Output Current1, IOUT . . . . . . . . . . . . . . . . . . . . . ±1.4 A
Peak Output Current (Brake)2, IOUT(BRK) . ±3.0 A
Period2 for IOUT(BRK) to fall from
±3.0 A to ±1.4 A . . . . . . . . . . . . . . . 800 ms
Logic Supply Voltage, VDD . . . . . . . . . . . 7.0 V
Logic Input Voltage Range, VIN
(continuous) . . . . . . -0.3 V to VDD + 0.3 V
(tw <30 ns) . . . . . . . -1.0 V to VDD + 1.0 V
Package Power Dissipation, PD . . See Graph
Operating Temperature, TA . . . -20°C to +85°C
Junction Temperature3, TJ . . . . . . . . . +150°C
Storage Temperature,TS . . . . -55°C to +150°C
1Output 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.
2Peak 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.
3Fault conditions that produce excessive junction
temperature will activate device thermal shutdown
circuitry. These conditions can be tolerated, but should
be avoided.
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’s 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 TSSOP package with an exposed thermal pad. Each
package type is available in a lead-free version (100% matte tin leadframe).
Features
„ Pwiwnw-.DfaotarS-hpeeit4nU.croemplacement 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
Part Number Pb-free* Package
Packing
A8904SLB-T
A8904SLBTR-T
A8904SLP-T
A8904SLPTR-T
Yes 24-pin SOIC 31 per tube
Yes 24-pin SOIC 450 per reel
Yes 28-pin TSSOP 50 per tube
Yes 28-pin TSSOP 4000 per reel
*Pb-based variants are being phased out of the product line. The variants cited in this footnote
are in production but have been determined to be LAST TIME BUY. This classification
indicates that sale of this device is currently restricted to existing customer applications.
The variants should not be purchased for new design applications because obsolescence
in the near future is probable. Samples are no longer available. Status change: October
31, 2006. Deadline for receipt fo LAST TIME BUY orders: April 27, 2007. These variants
include: A8904SLB, A8904SLBTR, A8904SLP, and A8904SLPTR.

1 page




8904 pdf
8904
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
ELECTRICAL CHARACTERISTICS continued
Characteristic
CWD Current
Symbol
ICWD
CWD Threshold Voltage
Max. FLL Oscillator Frequency
Oscillator High Duration
Oscillator Low Duration
Maximum Output Current
VTL
VTH
fOSC
ton
toff
IOUT(MAX)
Transconductance Gain
Centertap Resistors
Back-EMF Threshold with respect
to VCTAP at FCOM transition
gm
RCT
Test Conditions
Charging, D26 = 0, D27 = 0
Charging, D26 = 0, D27 =1
Charging, D26 = 1 D27 = 0
Charging, D26 = 1, D27 =1
D3 = 0, D4 = 0, D28 = 0
D3 = 0, D4 = 1, D28 = 0
D3 = 1, D4 = 0, D28 = 0
D3 = 1, D4 = 1, D28 = 0
D3 = 0, D4 = 0, D28 = 1
D3 = 0, D4 = 1, D28 = 1
D3 = 1, D4 = 0, D28 = 1
D3 = 1, D4 = 1, D28 = 1
D28 = 1
D28 = 0
Min.
-9.0
-18
-27
-36
0.22
2.25
20*
20
20
1.0
0.9
500
500
415
210
420
5.0
5.0
-5.0
Limits
Typ. Max.
-10 -11
-20 -22
-30 -33
-40 -44
0.25 0.28
2.5 2.75
——
——
——
1.2 1.4
1.0 1.1
600 700
250 —
600 700
500 585
300 —
125 —
250 290
500 580
10 13
20 37
-20 -37
Negative current is defined as coming out of (sourcing) the specified device terminal.
* Operation at an oscillator frequency greater than the specified minimum value is possible but not waranteed.
Units
µA
µA
µA
µA
V
V
MHz
ns
ns
A
A
mA
mA
mA
mA
mA
mA
mA/V
mA/V
k
mV
mV
www.allegromicro.com
5

5 Page





8904 arduino
8904
3-PHASE BRUSHLESS DC
MOTOR CONTROLLER/DRIVER
Functional Description (cont’d)
Speed error detection
Speed error signals
A speed error signal is created by integrating the differences
between the TACH and REF signal. If the TACH signal goes
low before the REF signal then an ERROR FAST is produced
and if the TACH signal goes low after the REF signal then an
ERROR SLOW is produced. The error signal generated enables
the appropriate current source (see diagram next page) to either
charge or discharge the filter components on the FILTER
terminal.
The FILTER voltage is then used to provide linear current
control in the windings via the transconductance stage (see
diagram next page). The output current is sensed through an
internal sense resistor, RS. The voltage across the sense resistor
is compared to the lowest of either one-tenth of the voltage at the
FILTER terminal, minus the filter threshold voltage, or to the
maximum current limit reference.
Alternatively, external control of the FILTER terminal can
be introduced by disabling the frequency-lock loop circuitry
(D24 = 1).
The transconductance function is defined as:
IOUT = (VFILTER – VFILTERTH) / (10 x RS x G)
where RS is nominally 200 m,
VFILTERTH is approximately 1.85 V,
G = 1, when D28 = 0 and gain = 500 mA/V or
G = 2, when D28 = 1 and gain = 250 mA/V.
The closed loop control response of the overall system is
shaped via the filter components that are introduced at the
FILTER terminal.
Clamping the current to a level defined by the serial port
(D3 & D4) provides output current limit protection. This feature
is particularly useful where high transient currents are experi-
enced, e.g., during start-up. Once normal running conditions are
reached, the current limit can be appropriately reduced. Note
that the current limit is scaled according to the gm value selected.
www.allegromicro.com
11

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