3968 datasheet, PDF - EEWORLD Datasheet

3968: Descriptiondual full-bridge pwm motor driver with brake; File Size139KB，12 Pages; ManufacturerAll Sensors

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dual full-bridge pwm motor driver with brake

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3968

ADVANCE INFORMATION

(subject to change without notice)

September 3, 1999

DUAL FULL-BRIDGE PWM

MOTOR DRIVER WITH BRAKE

The A3968SA and A3968SLB are designed to bidirectionally control two

dc motors. Each device includes two H-bridges capable of continuous output

currents of

±650

mA and operating voltages to 30 V. Motor winding current

can be controlled by the internal fixed-frequency, pulse-width modulated

(PWM), current-control circuitry. The peak load current limit is set by the

user’s selection of a reference voltage and current-sensing resistors. Except

for package style and pinout, the two devices are identical.

The fixed-frequency pulse duration is set by a user-selected external

RC timing network. 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 transitions.

To reduce on-chip power dissipation, the H-bridge power outputs have

been optimized for low saturation voltages. The sink drivers feature Allegro’s

patented Satlington™ output structure. The Satlington outputs combine the

low voltage drop of a saturated transistor and the high peak current capability

of a Darlington.

For each bridge, the INPUT

and INPUT

terminals determine the load

current polarity by enabling the appropriate source and sink driver pair.

When a logic low is applied to both INPUTs of a bridge, the braking function

is enabled. In brake mode, both source drivers are turned OFF and both sink

drivers are turned ON, thereby dynamically braking the motor. When a logic

high is applied to both INPUTs of a bridge, all output drivers are disabled.

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

includes thermal shutdown with hysteresis, ground-clamp and flyback diodes,

and crossover-current protection.

The A3968SA is supplied in a 16-pin dual in-line plastic package. The

A3968SLB is supplied in a 16-lead plastic SOIC with copper heat sink tabs.

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

Data Sheet

29319.29

A3968SLB

OUT

INPUT

GROUND

SENSE

OUT

LOAD

SUPPLY

REFERENCE

LOGIC

OUT

INPUT

GROUND

SENSE

OUT

LOGIC

SUPPLY

REF

Dwg. PP-066

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, V

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

30 V

Output Current, I

OUT

(peak) ..........

750 mA

(continuous) ..............................

650 mA

Logic Supply Voltage, V

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

7.0 V

Input Voltage, V

.....

-0.3 V to V

+ 0.3 V

Sense Voltage, V

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

1.0 V

Package Power Dissipation (T

= 25°C), P

A3968SA ...................................

2.08 W*

A3968SLB .................................

1.87 W*

Operating Temperature Range,

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

-20

C to +85

Junction Temperature,

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

+150

Storage Temperature Range,

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

-55

C to +150

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 150°C.

* Per SEMI G42-88 Specification,

Thermal Test

Board Standardization for Measuring Junction-

to-Ambient Thermal Resistance of Semiconductor

Packages.

FEATURES

±650

mA Continuous Output Current

30 V Output Voltage Rating

Internal Fixed-Frequency PWM Current Control

Satlington™ Sink Drivers

Brake Mode

User-Selectable Blanking Window

Internal Ground-Clamp & Flyback Diodes

Internal Thermal-Shutdown Circuitry

Crossover-Current Protection and UVLO Protection

Always order by complete part number:

Part Number

A3968SA

A3968SLB

Package

16-pin DIP

16-lead batwing SOIC

θJA

60°C/W

67°C/W

θJC

38°C/W

—

θJT

—

6°C/W

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