Allegro A3964SLB, A3964SB Datasheet

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

DUAL FULL-BRIDGE PWM MOTOR DRIVER

3964

Data Sheet

29319.28*

A3964SLB

1

OUT

1B

1

OUT

LOAD

REF(IN)

RC

2

1

3

1A

4

5

6

7

9

8

1

9

1

10

1

V

BB

θ

1

PWM 1

SENSE

SUPPLY

GROUND

GROUND

V

PHASE

ENABLE

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, VBB. . . . . . . . . 33 V

Output Current, I

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

Logic Supply Voltage, V
Logic Input Voltage Range,

V

. . . . . . . . . . . -0.3 V to VCC + 0.3 V

IN

Sense Voltage, V
Reference Output Current,

I

REF(OUT)

Package Power Dissipation,

P

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

D

Operating Temperature Range,

T

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

A

Junction Temperature, T
Storage Temperature Range,

T

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

S

* 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.

† Fault conditions that produce excessive junction
temperature will activate the device’s thermal shutdown
circuitry. These conditions can be tolerated but should
be avoided.

(10 µs) . . . . . . ±1.0 A*

OUT

CC

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

S

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

J

20

OUT

2B

2

19

SENSE

2

18

OUT

2A

LOGIC

17

V

CC

SUPPLY

16

GROUND

15

GROUND

V

14

REF(OUT)

13

RC

12

11

2

PHASE

ENABLE

Dwg. PP-047-1

2

2

PWM 2

θ

2

±800 mA*

. . . . . . . . . 7.0 V

. . . . . . . +150˚C†

Designed for pulse-width modulated (PWM) current control of
bipolar stepper motors, the A3964SB and A3964SLB are 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 transi­tions. 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. Spe­cial power-up sequencing is not required. Internal circuit protection
includes thermal shutdown with hysteresis, transient-suppression
diodes, and crossover-current protection.

The A3964SB is supplied in a 24-pin plastic DIP with copper heat
sink tabs; A3964SLB is supplied in a 20-lead plastic SOIC with copper
heat sink tabs. The power tabs are at ground potential and need no
electrical isolation.

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

Always order by complete part number:

Part Number Package

A3964SB 24-Pin DIP
A3964SLB 20-Lead Wide-Body SOIC

3964

1452

19

–

–
8109

3141820

7

121113

17

61516

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

A3964SB

5

R = 6.0°C/W

θJT

4

3

SUFFIX 'B', R = 40°C/W

2

1

SUFFIX 'LB', R = 60°C/W

0

25

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

50 75 100 125 150

TEMPERATURE IN °C

θJA

θJA

Dwg. GP-049-4

FUNCTIONAL BLOCK DIAGRAM

CONNECT.

OUT

SENSE

OUT

LOAD

SUPPLY

GROUND

GROUND

V

REF(IN)

PHASE

ENABLE

CONNECT.

(A3964SLB pinning shown)

RC

NO

NO

1

NC

2

1B

1

3

1

4

1A

5

6

7

8

9

9

1

10

θ

1

1

11

1

12

NC

V

BB

PWM 1

2

V

PWM 2

NC

NC

NO

24

CONNECT.

23

OUT

2B

22

SENSE

2

21

OUT

2A

LOGIC

20

CC

SUPPLY

19

GROUND

18

GROUND

17

V

REF(OUT)

16

RC

2

15

PHASE

θ

2

14

13

2

ENABLE

NO
CONNECT.

Dwg. PP-005-2

2

PHASE

ENABLE

1

1

R

T

SOURCE
DISABLE

ONE SHOT

1

RC

C

T

LOGIC

V

CC

PWM 1

SUPPLY

+

SENSE

OUT

1

1A

1

2.5 V

REFERENCE

OUT

REF

1B

OUT

R

A

IN

REF

R

S

V

V

REF(IN)

LOAD

BB

R

SUPPLY

B

2A

OUT

2B

OUT

UVLO
& TSD

PHASE

2

2

PWM 2

ENABLE

2

SOURCE
DISABLE

+

2

ONE SHOT

2

RC

R

SENSE

S

C

T

R

T

Dwg. FP-033-1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1997 Allegro MicroSystems, Inc.

3964

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

TRUTH TABLE

ENABLE PHASE OUT

OUT

A

B

H X Off Off

L HHL
LLLH

X = Irrelevant

ELECTRICAL CHARACTERISTICS at T
V

= 0 V, 30 kΩ & 1000 pF RC to Ground (unless noted otherwise)

S

Characteristic Symbol Test Conditions Min. Typ. Max. Units

= +25°C, V

A

= 30 V, VCC = 4.75 V to 5.25 V,

BB

Limits

Output Drivers

Load Supply Voltage Range V
Output Sustaining Voltage V

CE(sus)

Output Leakage Current I

Output Saturation Voltage V

CE(SAT)

Clamp Diode Forward Voltage V
(Sink or Source)

Motor Supply Current I
(No Load)

BB(ON)

I

BB(OFF)

BB

CEX

F

Operating, I
I

= ±800 mA, L = 3 mH, VBB = 33 V 33 — — V

OUT

V

= VBB = 33 V — <1.0 50 µA

OUT

V

= 0 V, VBB = 33 V — <1.0 -50 µA

OUT

Source Driver, I
Source Driver, I
Source Driver, I
Sink Driver, I
Sink Driver, I
Sink Driver, I

= ±800 mA, L = 3 mH 5.0 — 30 V

OUT

= -500 mA — 1.0 1.2 V

OUT

= -750 mA — 1.1 1.5 V

OUT

= -800 mA — — 1.7 V

OUT

= +500 mA — 0.3 0.6 V

OUT

= +750 mA — 0.5 1.2 V

OUT

= +800 mA — — 1.5 V

OUT

IF = 500 mA — 1.1 1.4 V
I

= 750 mA — 1.3 1.6 V

F

IF = 800 mA — — 1.7 V
V
V

= 0.8 V — 2.0 4.0 mA

ENABLE

= 2.4 V — 0 500 µA

ENABLE

NOTES: 1. Typical Data is for design information only.

2. Negative current is defined as coming out of (sourcing) the specified device terminal.