Bipolar Stepper and High Current DC Motor Driver

A3989

4

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Max.

Units

Load Supply Voltage Range

Operating

8.0

–

36

V

Logic Supply Voltage Range

Operating

3.0

–

5.5

V

VDD Supply Current

–

7

10

mA

Output On Resistance (dc motor driver)

–

350

450

mΩ

–

350

450

mΩ

Output On Resistance (stepper motor

driver)

–

700

800

mΩ

–

700

800

mΩ

–

–

1.

V

Output Leakage

–0

–

0

µA

VBB Supply Current

DC = 50%

–

–

8

mA

Control Logic

Logic Input Voltage

–

–

V

–

–

V

Logic Input Current

–0

<1.0

0

µA

Input Hysteresis

150

300

500

mV

Propagation Delay Times

PWM change to source on

350

550

1000

ns

PWM change to source off

35

–

300

ns

PWM change to sink on

350

550

1000

ns

PWM change to sink off

35

–

50

ns

Crossover Delay

300

45

1000

ns

Blank Time (dc motor driver)

.5

3.

4

µs

Blank Time (stepper motor driver)

0.7

1

1.3

µs

VREFx Pin Input Voltage Range

Operating

0.0

–

1.5

V

VREFx Pin Reference Input Current

–

–

±1

μA

–5

–

5

%

–5

–

5

%

–15

–

15

%

Protection Circuits

VBB UVLO Threshold

7.3

7.6

7.9

V

VBB Hysteresis

400

500

600

mV

VDD UVLO Threshold

.65

.8

.95

V

VDD Hysteresis

75

105

15

mV

Thermal Shutdown Temperature

155

165

175

°C

Thermal Shutdown Hysteresis

–

15

–

°C

1

For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.



Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for indi-

vidual units, within the specified maximum and minimum limits.

3

DC Control Logic

PHASE

ENABLE

MODE

OUTA

OUTB

Function

1

1

1

H

L

Forward (slow decay SR)

1

1

0

H

L

Forward (fast decay SR)

0

1

1

L

H

Reverse (slow decay SR)

0

1

0

L

H

Reverse (fast decay SR)

X

0

1

L

L

Brake (slow decay SR)

1

0

0

L

H

Fast decay SR*

0

0

0

H

L

Fast decay SR*

* To prevent reversal of current during fast decay SR – the outputs will go to the high impedance state as the current gets near zero.