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A3962: DescriptionDUAL FULL-BRIDGE PWM MOTOR DRIVER; File Size105KB，8 Pages; ManufacturerAllegro; Websitehttp://www.allegromicro.com/

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DUAL FULL-BRIDGE PWM MOTOR DRIVER

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3962

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

3962

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

bipolar stepper motors, the A3962SLB is capable of continuous output

currents to

±800

mA and operating voltages to 30 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.

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

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.

For each bridge the PHASE input controls load current polarity by

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

the ENABLE input, when held high, disables the output drivers. Spe-

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

includes thermal shutdown with hysteresis, transient-suppression

diodes, and crossover-current protection.

The A3962SLB is supplied in a 20-lead plastic SOIC with copper

heat sink tabs. The power tab is at ground potential and needs no

electrical isolation.

Data Sheet

29319.27

DUAL FULL-BRIDGE PWM MOTOR DRIVER

SENSE

OUT

LOAD

SUPPLY

GROUND

REF(IN)

PHASE

ENABLE

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, V

. . . . . . . . .

30 V

Output Current, I

OUT

. . . . . . . . . .

800 mA*

Logic Supply Voltage, V

. . . . . . . . .

7.0 V

Logic Input Voltage Range,

. . . . . . . . . . .

-0.3 V to V

+ 0.3 V

Sense Voltage, V

SENSE

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

1.0 V

Reference Output Current,

REF OUT

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

1.0 mA

Package Power Dissipation,

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

See Graph

Operating Temperature Range,

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

-20˚C to +85˚C

Junction Temperature, T

. . . . . . .

+150˚C†

Storage Temperature Range,

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

-55˚C to +150˚C

* 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 tempera

ture of 150˚C.

D LY

O N

R O

D CE

E N

U E

IN R

T E

N F

O E

C R

IS R

D O

—

SENSE

OUT

LOGIC

SUPPLY

GROUND

REF(OUT)

PWM 1

PWM 2

OUT

PHASE

ENABLE

Dwg. PP-047-1

FEATURES

±800

mA Continuous Output Current Rating

30 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

Automotive Capable

† Fault conditions that produce excessive junction

temperature will activate the device’s thermal

shutdown circuitry. These conditions can be

tolerated but should be avoided.

Always order by complete part number:

A3962SLB

A3962 Related Products

	A3962	3962	A3962SLB
Description	DUAL FULL-BRIDGE PWM MOTOR DRIVER	DUAL FULL-BRIDGE PWM MOTOR DRIVER	DUAL FULL-BRIDGE PWM MOTOR DRIVER

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