A3955SBT Allegro Micro Systems, Inc., A3955SBT Datasheet
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A3955SBT
Manufacturer Part Number
A3955SBT
Description
DIP16
Manufacturer
Allegro Micro Systems, Inc.
Datasheet
1.A3955SBT.pdf
(16 pages)
Specifications of A3955SBT
Date_code
09+
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
A3955SBT
Manufacturer:
ALLEGRO/雅丽高
Quantity:
20 000
Note the A3955SB (DIP) and the A3955SLB
(SOIC) are electrically identical and share a
common terminal number assignment.
Load Supply Voltage, V
Output Current, I
Logic Supply Voltage, V
Logic/Reference Input Voltage Range,
Sense Voltage, V
Package Power Dissipation,
Operating Temperature Range,
Junction Temperature, T
Storage Temperature Range,
* Output current rating may be limited by duty
cycle, ambient temperature, and heat sinking.
Under any set of conditions, do not exceed the
specified current rating or a junction temperature
of 150½C.
† Fault conditions that produce excessive junction
temperature will activate the device’s thermal
shutdown circuitry. These conditions can be
tolerated but should be avoided.
ABSOLUTE MAXIMUM RATINGS
FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER
(Continuous) . . . . . . . . . . . . . . ±1.5 A*
V
P
T
T
A
S
IN
D
. . . . . . . . . . . . . . . . . . . . See Graph
. . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . .
. . . . . . . . . . . -0.3 V to V
OUT
S
. . . . . . . . . . . . . . . 1.0 V
BB
CC
J
. . . . . . . . . . 50 V
. . . . . . . +150°C†
. . . . . . . . . 7.0 V
-55°C to +150°C
-20°C to +85°C
CC
+ 0.3 V
3955
Always order by complete part number:
bipolar stepper motor in a microstepping mode. The outputs are rated for
continuous output currents to ±1.5 A and operating voltages to 50 V. Internal
pulse-width modulated (PWM) current control combined with an internal
three-bit nonlinear digital-to-analog converter allows the motor current to be
controlled in full-, half-, quarter-, or eighth-step (microstepping) modes.
Nonlinear increments minimize the number of control lines necessary for
microstepping. Microstepping provides for increased step resolution, and
reduces torque variations and resonance problems at low speed.
operates in a slow (recirculating) current-decay mode, fast (regenerative)
current-decay mode, or in a mixed current-decay mode in which the off time is
divided into a period of fast current decay with the remainder of the fixed off
time spent in slow current decay. The combination of user-selectable current-
sensing resistor and reference voltage, digitally selected output current ratio;
and slow, fast, or mixed current-decay modes provides users with a broad,
variable range of motor control.
transient-suppression diodes, and crossover current protection. Special
power-up sequencing is not required.
dual-in-line plastic package with copper heat-sink tabs (suffix ‘B’), and a 16-
lead plastic SOIC with copper heat-sink tabs (suffix ‘LB’). For both package
styles, the power tab is at ground potential and needs no electrical isolation.
Both packages are available in a lead-free version (leadframe plating 100%
matte tin), indicated by suffix -T.
FEATURES
*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 of LAST TIME
BUY orders: April 27, 2007. These variants include: A3955SB, A3955SLB, and
A3955SLBTR.
A3955SLBTR-T
±1.5 A Continuous Output Current
50 V Output Voltage Rating
Internal PWM Current Control
3-Bit Non-Linear DAC
Fast, Mixed Fast/Slow, and Slow Current-Decay Modes
Internal Transient-Suppression Diodes
Internal Thermal-Shutdown Circuitry
Crossover-Current and UVLO Protection
A3955SLB-T
Part Number
A3955SB-T
The A3955SB and A3955SLB are designed for driving one winding of a
Internal circuitry determines whether the PWM current-control circuitry
Internal circuit protection includes thermal shutdown with hysteresis,
The A3955S— is supplied in a choice of two power packages; a 16-pin
Pb-free*
Yes
Yes
Yes
16-Lead SOIC
16-Lead SOIC
16-Pin DIP
Package
1000 per reel
25 per Tube
47 per Tube
Packing