Allegro A2927SEB Datasheet

2927

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

PRELIMINARY INFORMATION

(Subject to change without notice)

September 16, 1997

REF 1

V

44

PWM 1

24

21

I

1

PHASE

43

θ

PWM 2

25

REF 2

V

ENABLE

424140

1

θ

26

PHASE

1

1

LOGIC SUPPLY

RC

1

CC

V

EN

2

2

EN

27

28

2

2

2

RC

ENABLE

Dwg. PP-021

1

1A

OUT

6

GND

7

8

9

10

11

12

13

14

15

16

GND

17 29

18

2A

OUT

1B

1

E

SENSE

4

5

1

2

19

20

2

2

E

SENSE

OUT

3

21

2B

OUT

10

I

I

2

1

BB

V

22

23

20

I

LOAD SUPPLY

11

Data Sheet

29319.23

2927

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

The A2927SEB motor driver is designed to drive both windings of a
bipolar stepper motor or bidirectionally control two dc motors. Both
bridges are capable of sustaining 50 V and include internal pulse-width
modulation (PWM) control of the output current to 1.5 A.

GND

39

38

37

36

35

34

33

32

31

30

GND

For PWM current control, the maximum output current is determined
by the user’s selection of a reference voltage and sensing resistor. Two
logic-level inputs select output current limits of 0, 33%, 67%, or 100%
of the maximum level. A PHASE input to each bridge determines load
current direction. Active-low ENABLE inputs control the four drivers in
each bridge.

Internally generated delays prevent cross-over currents when
switching current direction. Special power-up sequencing is not required.
Thermal protection circuitry disables the outputs if the chip temperature
exceeds safe operating limits.

The A2927SEB is supplied in a 44-lead power PLCC for surface­mount applications. Its batwing construction provides for maximum
package power dissipation in the smallest possible construction.

ABSOLUTE MAXIMUM RATINGS

at T

≤ +150°C

J

Motor Supply Voltage, VBB................... 50 V

Output Current, I
Logic Supply Voltage, V

......................... ±1.5 A

OUT

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

CC

Logic Input Voltage Range,

V

............................... -0.3 V to +7.0 V

IN

Output Emitter Voltage, V

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

E

Package Power Dissipation,

P

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

D

Operating Temperature Range,

T

................................. -20°C to +85°C

A

DISCONTINUED PRODUCT

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 peak
current rating or a junction temperature of +150°C.

— FOR REFERENCE ONLY

FEATURES

■ 1.5 A Output Current

■ 50 V Output Sustaining Voltage

■ Internal Flyback Diodes

■ Digital Control of Output Current

■ Undervoltage Lockout

■ Internal Thermal Shutdown Circuitry

Always order by complete part number: A2927SEB .

2927

22

365

4412

1

44

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

PWM CURRENT-CONTROL CIRCUITRY

CHANNEL 1
PIN NUMBERS
SHOWN.

I

0

I

1

V

REF

40 kΩ

20 kΩ

10 kΩ

÷10

OUT

V

BB

A

OUT

B

E

SENSE

R

C

R

S

–
+

C

C

ONE

SHOT

RC

R

T

SOURCE
DISABLE

C

T

Dwg. EP-007-4

TRUTH TABLE

12.5

R = 6°C/W

θJT

10

7.5

5.0

2.5

0

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

25

R = 35°C/W

θJA

50 75 100 125 150

TEMPERATURE IN °C

Dwg. GP-020-1

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1997 Allegro MicroSystems, Inc.

Enable Phase Out

A

Out

LHHL
LLLH

HXZZ

X = Don’t care
Z = High impedance

B

2927

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

ELECTRICAL CHARACTERISTICS at T

= +25°C, V

A

= 50 V, VCC = 5.0 V, V

BB

= 5.0 V (unless

REF

otherwise noted).

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Drivers (OUT

Motor Supply Range V
Output Leakage Current I

Output Saturation Voltage V

Flyback Diode Forward Volt. V
Driver Supply Current I

Control Logic

or OUTB)

A

BB

CEX

CE(SAT

F

BB(ON)

I

BB(OFF)

I

= ±1.5 A, L = 15 mH 10 — 50 V

OUT

V

= V

OUT

BB

V

= 0 — <-1.0 -5.0 µA

OUT

)

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

= +1.0 A* — 0.5 0.7 V

OUT

= +1.5 A* — 0.8 0.9 V

OUT

= -1.0 A* — 1.8 1.9 V

OUT

= -1.5 A* — 1.9 2.0 V

OUT

— <1.0 5.0 µA

IF = 1.5 A — 1.6 2.0 V
Both Bridges ON, No Load — 6.5 9.0 mA
Both Bridges OFF — 4.0 4.0 mA

Input Voltage V

Input Current I

Reference Voltage Range V
Current Limit Threshold V

IN(1)

V

IN(0)

IN(1)

I

IN(0)

REF

REF/VSENSE

(at trip point)

Thermal Shutdown Temp. T
Total Logic Supply Current I

Negative current is defined as coming out of (sourcing) the specified device pin.
Typical Data is for design information only.
* Pulse test (<10 ms).

J

CC(ON)

I

CC(OFF)

All Inputs 2.4 — — V
All Inputs — — 0.8 V
V

= 2.4 V — <1.0 20 µA

IN

VIN = 0.8 V — -3.0 -200 µA
Operating 1.5 — 7.5 V
I0 = I1 = 0.8 V 9.5 10 10.5 —
I

= 2.4 V, I1= 0.8 V 13.5 15 16.5 —

0

I

= 0.8 V, I1 = 2.4 V 25.5 30 34.5 —

0

I0 = I1 = VEN = 0.8 V, No Load — 90 105 mA
I0 = I1 = 2.4 V, No Load — 10 12 mA

— 170 — °C