A3955SBT Allegro Micro Systems, Inc., A3955SBT Datasheet

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

Company:

BOSTOCK HK LIMITED

Part Number:

A3955SBT

Manufacturer:

Company:

Meier Automation Equipment Co., Limited

Part Number:

A3955SBT

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

Current page: 1 of 16
Download datasheet (153Kb)

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*

. . . . . . . . . . . . . . . . . . . . See Graph

. . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . .

. . . . . . . . . . . -0.3 V to V

OUT

. . . . . . . . . . . . . . . 1.0 V

. . . . . . . . . . 50 V

. . . . . . . +150°C†

. . . . . . . . . 7.0 V

-55°C to +150°C

-20°C to +85°C

+ 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

16-Lead SOIC

16-Pin DIP

Package

1000 per reel

25 per Tube

47 per Tube

Packing

Related parts for A3955SBT

Related keywords

A3955SBT datasheet
A3955SBT data sheet
A3955SBT pdf datasheet
A3955SBT component
A3955SBT part
A3955SBT distributor
A3955SBT RoHS
A3955SBT datasheet download