A3951SW Allegro Micro Systems, Inc., A3951SW Datasheet

A3951SW

Manufacturer Part Number

A3951SW

Description

Full-bridge PWM motor driver

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A3951SW.pdf (12 pages)

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REF/

Load Supply Voltage, V

Output Current, I

Logic Supply Voltage, V

Logic Input Voltage Range,

Sense Voltage, V

Reference 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, heat sinking and/or forced

cooling. Under any set of conditions, do not

exceed the specified current rating or a junction

temperature of +150 C.

* Fault conditions that produce excessive junction

temperature will activate device thermal shutdown

circuitry. These conditions can be tolerated but

should be avoided.

GROUND

SUPPLY

ENABLE

PHASE

BRAKE

LOGIC

(Continuous) ...............................

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

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

............................... –20 C to +85 C

............................. –55 C to +150 C

20 s) ..................................

OUT

SENSE

LOGIC

REF

........................ 1.5 V

....................... V

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

.................. 7.0 V

............. +150 C*

Dwg. PP-056-1

LOAD

SUPPLY

SENSE

LOAD

SUPPLY

+ 0.3 V

OUT B

GROUND

OUT A

3.5 A

2.0 A

FULL-BRIDGE PWM MOTOR DRIVER

of inductive loads, the A3951SB and A3951SW are capable of

continuous output currents to 2 A and operating voltages to 50 V.

Internal fixed off-time PWM current-control circuitry can be used to

regulate the maximum load current to a desired value. The peak load

current limit is set by the user’s selection of an input reference voltage

and external sensing resistor. The fixed off-time pulse duration is set

by a user-selected external RC timing network. Internal circuit

protection includes thermal shutdown with hysteresis, transient

suppression diodes, and crossover-current protection. Special power-

up sequencing is not required. The A3951SB and A3951SW are

improved replacements for the UDN2953B and UDN2954W, respec-

tively. For new system designs, the A3952SB/SEB/SLB/SW are

recommended.

current polarity by selecting the appropriate source and sink driver

pair. A user-selectable blanking window prevents false triggering of

the PWM current control circuitry. With the ENABLE input held high,

all output drivers are disabled.

function is enabled. This overrides ENABLE and PHASE to turn off

both source drivers and turn on both sink drivers. The brake function

can be safely used to dynamically brake brush dc motors.

with copper heat-sink contact tabs. The lead configuration enables

easy attachment of a heat sink while fitting a standard printed wiring

board layout. The A3951SW, for higher package power dissipation

requirements, is supplied in a 12-pin single in-line power-tab package.

In either package style, the batwing/power tab is at ground potential

and needs no isolation.

Always order by complete part number:

3951

A3951SB

A3951SW

Part Number

Designed for bidirectional pulse-width modulated current control

With the ENABLE input held low, the PHASE input controls load

When a logic low is applied to the BRAKE input, the braking

The A3951SB is supplied in a 16-pin dual in-line plastic package

50 V Output Voltage Rating

Internal PWM Current Control

Internal Transient-Suppression Diodes

Under-Voltage Lockout

Internal Thermal-Shutdown Circuitry

Crossover-Current Protection

Default Brake Current Limit

2 A Continuous Output Current Rating

12-Pin Power-Tab SIP

16-Pin DIP

Package

43 C/W

36 C/W

6.0 C/W

2.0 C/W

Related parts for A3951SW

A3951SW Summary of contents

Page 1

... FULL-BRIDGE PWM MOTOR DRIVER Designed for bidirectional pulse-width modulated current control of inductive loads, the A3951SB and A3951SW are capable of continuous output currents and operating voltages Internal fixed off-time PWM current-control circuitry can be used to regulate the maximum load current to a desired value. The peak load current limit is set by the user’ ...

Page 2

FULL-BRIDGE PWM MOTOR DRIVER PHASE ENABLE REF/ BRAKE 9R 1 GROUND 10 8 SUFFIX 'B 6.0 C SUFFIX 'W C SUFFIX 'B C/W JA ...

Page 3

Characteristic Output Drivers Load Supply Voltage Range Output Leakage Current Output Saturation Voltage Clamp Diode Forward Voltage (Source or Sink) Load Supply Current (No Load) www.allegromicro.com Symbol Test Conditions V Operating, I ...

Page 4

FULL-BRIDGE PWM MOTOR DRIVER Characteristic Control Logic Logic Supply Voltage Range Logic Input Voltage Logic Input Current Reference Voltage Range Reference Input Current Reference Voltage Divider Ratio PWM RC Fixed Off Time PWM Minimum On Time Propagation Delay Time ...

Page 5

INTERNAL PWM CURRENT CONTROL DURING FORWARD AND REVERSE OPERATION The A3951SB/SW contain a fixed off-time pulse-width modulated (PWM) current-control circuit that can be used to limit the load current to a desired value. The value of the current limiting (I ...

Page 6

FULL-BRIDGE PWM MOTOR DRIVER Choosing a small value for R essentially disables the S current limiting during braking. Therefore, care should be taken to ensure that the motor’s current does not exceed the absolute maximum ratings of the device. ...

Page 7

V BB DRIVE CURRENT R S RECIRCULATION Figure 3 — Load-Current Paths E Pulse-Width Modulation NABLE Toggling the ENABLE input turns on and off the selected source and sink drivers; the load inductance causes the current to flow from ground ...

Page 8

FULL-BRIDGE PWM MOTOR DRIVER To minimize current-sensing inaccuracies caused by ground trace I•R drops, the current-sensing resistor should have a separate return to the ground terminal of the device. For low-value sense resistors, the I•R drops in the PCB ...

Page 9

... See also, the section on brake operation under “Functional Description”, above. Stepper Motor Applications The A3951SB and A3951SW may be used for bidrectional control of bipolar stepper motors with continu- ous output currents and peak start-up currents as high as 3.5 A. ...

Page 10

FULL-BRIDGE PWM MOTOR DRIVER 16 0.280 0.240 1 0.070 0.045 0.210 MAX 0.015 MIN 0.022 0.014 16 7.11 6.10 1 1.77 1.15 5.33 MAX 0.39 MIN 0.558 0.356 NOTES: 1. Leads and 16 may be half ...

Page 11

INDEX AREA 1 0.065 0.035 0.51 INDEX AREA 1 1.65 0.89 NOTES: 1. Lead thickness is measured at seating plane or below. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration at vendor’s option within limits ...

Page 12

FULL-BRIDGE PWM MOTOR DRIVER The products described here are manufactured under one or more U.S. patents or U.S. patents pending. Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as ...

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