A3961SLB Allegro, A3961SLB Datasheet

A3961SLB

Manufacturer Part Number

A3961SLB

Description

Dual Full Bridge PWM Motor Driver 24-Pin SOIC W

Manufacturer

Allegro

Type

Dual Full Bridge PWM Motor Driverr

Datasheet

1.A3961SLB.pdf (10 pages)

Specifications of A3961SLB

Package

24SOIC W

Maximum Operating Current

85 mA

Operating Temperature

-20 to 85 Â°C

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

A3961SLB

Manufacturer:

SANYO

Quantity:

150

Company:

Meier Automation Equipment Co., Limited

Part Number:

A3961SLB

Manufacturer:

ALLEGRO/雅丽高

Quantity:

20 000

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3961

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

Note the A3961SB (DIP) and the A3961SLB

(SOIC) are electrically identical and share a

common terminal number assignment.

Load Supply Voltage, V

Output Current, I

Logic Supply Voltage, V

Logic Input Voltage Range,

Sense Voltage, V

Reference Output Current,

Package Power Dissipation,

Operating Temperature Range,

Junction Temperature, T

Storage Temperature Range,

* Output current rating may be limited by duty

† Fault conditions that produce excessive

ABSOLUTE MAXIMUM RATINGS

cycle, ambient temperature, and heat sinking.

Under any set of conditions, do not exceed the

specified current rating or a junction tempera-

ture of 150˚C.

junction temperature will activate device

thermal shutdown circuitry. These conditions

can be tolerated but should be avoided.

REF OUT

GROUND

ENABLE

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

. . . . . . . . . . . . . . . . . -20˚C to +85˚C

. . . . . . . . . . . . . . . . -55˚C to +150˚C

SENSE

PHASE

REF

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

OUT

REF

OUT

BB1

. . . . . . . . . . . . . . . . . . . 1.0 mA

OUT

SENSE

. . . . . . . . . .

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

. . . . . . . . . . 45 V

. . . . . . . +150˚C†

. . . . . . . . . 7.0 V

DUAL FULL-BRIDGE PWM MOTOR DRIVER

PHASE

ENABLE

OUT

SENSE

OUT

GROUND

FULL/PD

BB2

800 mA*

+ 0.3 V

3961

bipolar stepper motors, the A3961S— is capable of continuous output

currents to 800 mA and operating voltages to 45 V. Internal fixed

off-time PWM current-control circuitry can be used to regulate the

maximum load current to a desired value. An internal precision voltage

reference is provided to improve motor peak current control accuracy.

The peak load current limit is set by the user’s selection of an external

resistor divider and current-sensing resistors.

RC timing networks. The capacitor in the RC timing network also

determines a user-selectable blanking window that prevents false

triggering of the PWM current control circuitry during switching transi-

tions. This eliminates the need for two external RC filter networks on

the current-sensing comparator inputs.

selecting the appropriate source and sink driver pair. For each bridge

the ENABLE input, when held high, disables the output drivers. Special

power-up sequencing is not required. Internal circuit protection includes

thermal shutdown with hysteresis, transient-suppression diodes, and

crossover-current protection.

24-pin dual-in-line plastic package with copper heat-sink tabs and

24-lead plastic SOIC with copper heat-sink tabs. In both packages the

power tab is at ground potential and needs no electrical isolation.

FEATURES

Always order by complete part number:

PART NUMBER

45 V Output Voltage Rating

Internal PWM Current Control, Saturated Sink Drivers

Internally Generated Precision 2.5 V Reference

Internal Transient-Suppression Diodes

Internal Thermal-Shutdown Circuitry

Crossover-Current Protection, UVLO Protection

800 mA Continuous Output Current Rating

Designed for pulse-width modulated (PWM) current control of

The fixed off-time pulse duration is set by user-selected external

For each bridge the PHASE input controls load current polarity by

The A3961S— is supplied in a choice of two power packages:

A3961SLB

A3961SB

24-Lead SOIC

PACKAGE

24-Pin DIP

40 C/W

55 C/W

6 C/W

Related parts for A3961SLB

A3961SLB Summary of contents

Page 1

... REF PHASE 14 PHASE 1 ENABLE 12 13 ENABLE 1 Note the A3961SB (DIP) and the A3961SLB (SOIC) are electrically identical and share a common terminal number assignment. ABSOLUTE MAXIMUM RATINGS Load Supply Voltage Output Current 800 mA* OUT Logic Supply Voltage 7 Logic Input Voltage Range -0 0.3 V ...

Page 2

... UVLO VOLTAGE AND REFERENCE + TSD REF REF FULL/PD 1 OUT 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright ©1995, 1996, Allegro MicroSystems, Inc. TRUTH TABLE PHASE OUT OUT Off MOTOR SUPPLY 2 C BB2 V BB2 OUT OUT ENABLE 2 CONTROL LOGIC ...

Page 3

DUAL FULL-BRIDGE PWM MOTOR DRIVER ELECTRICAL CHARACTERISTICS & 1000 Ground (unless noted otherwise) Characteristic Output Drivers Load Supply Voltage Range Output Leakage Current Output Saturation Voltage Clamp Diode Forward Voltage (Sink ...

Page 4

DUAL FULL-BRIDGE PWM MOTOR DRIVER ELECTRICAL CHARACTERISTICS & 1000 Ground (unless noted otherwise) (cont.) Characteristic Symbol Control Logic (Continued) Reference Output Current I Ref. Input Offset Current Comparator Input Offset Volt. ...

Page 5

DUAL FULL-BRIDGE PWM MOTOR DRIVER FUNCTIONAL DESCRIPTION Internal PWM Current Control. The A3961S— contains 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 peak value ...

Page 6

DUAL FULL-BRIDGE PWM MOTOR DRIVER where the series resistance of the OFF T T LOAD load the motor supply voltage and t BB specified in the electrical characteristics table. When ...

Page 7

DUAL FULL-BRIDGE PWM MOTOR DRIVER If desired, the reference input voltage can be filtered by placing a capacitor from REF IN return for this capacitor as well as R dent from the high-current power-ground trace to avoid changes in ...

Page 8

DUAL FULL-BRIDGE PWM MOTOR DRIVER 24 0.280 0.240 1 0.070 0.045 0.210 MAX 0.015 MIN 0.022 0.014 24 7.11 6.10 1 1.77 1.15 5.33 MAX 0.39 MIN 0.558 0.356 NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and ...

Page 9

... NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration at vendor’s option within limits shown. A3961SLB Dimensions in Inches (for reference only 0.050 0.6141 BSC 0 ...

Page 10

... X Bipolar X DMOS Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use ...

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