a2919 Allegro MicroSystems, Inc., a2919 Datasheet

a2919

Manufacturer Part Number

a2919

Description

Dual Full-bridge Pwm Motor Driver

Manufacturer

Allegro MicroSystems, Inc.

Datasheet

1.A2919.pdf (9 pages)

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2919

DUAL FULL-BRIDGE

MOTOR DRIVER

Motor Supply Voltage, V

Output Current, I

Logic Supply Voltage, V

Logic Input Voltage Range,

Output Emitter Voltage, V

Package Power Dissipation,

Operating Temperature Range,

Storage Temperature Range,

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.

G R OUND

S E NS E

P HAS E

ABSOLUTE MAXIMUM RATINGS

OUT

R E F 2

R C

(Peak, t

(Continuous) .......................... ±750 mA

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

............................... -55°C to +150°C

......................... -0.3 V to V

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

≤ ≤ ≤ ≤ ≤

at T

A2919SB

20 µs) ........................ ±1.0 A

OUT

≤ ≤ ≤ ≤ ≤

150°C

B B

................... 45 V

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

.................. 1.5 V

C C

S E NS E

P HAS E

Dwg. P P -005

LOAD

S UP P LY

OUT

G R OUND

R C

G R OUND

LOG IC

S UP P LY

R E F 1

+0.3 V

2919

both windings of a bipolar stepper motor or bidirectionally control two dc

motors. Both bridges are capable of sustaining 45 V and include

internal pulse width modulation (PWM) control of the output current to

750 mA. The outputs have been optimized for a low output-saturation

voltage drop (less than 1.8 V total source plus sink at 500 mA).

mined by the user’s selection of a reference voltage and sensing

resistor. Two logic-level inputs select output current limits of 0%, 41%,

67%, or 100% of the maximum level. A PHASE input to each bridge

determines load current direction.

protection against inductive transients. Internally generated delays

prevent crossover 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.

package with a copper lead-frame and heat sinkable tabs for improved

power dissipation capabilities. The A2919SLB is supplied in a 24-lead

surface-mountable SOIC. Their batwing construction provides for

maximum package power dissipation in the smallest possible construc-

tion. The A2919SB/SLB are available for operation from -40°C to

+85°C. To order, change the suffix from 'S–' to 'E–'. These devices are

also available on special order for operation to +125°C. For applica-

tions not requiring quarter-step operation, but desire lower detent or

running current, the similar UDN2916B/EB/LB may be preferred.

FEATURES

The A2919SB and A2919SLB motor drivers are designed to drive

For PWM current control, the maximum output current is deter-

The bridges include both ground clamp and flyback diodes for

The A2919SB is supplied in a 24-pin dual in-line plastic batwing

45 V Output Sustaining Voltage

Low Output Saturation Voltage

Internal Thermal Shutdown Circuitry

Half- or Quarter-Step Operation of Bipolar Stepper Motors

750 mA Continuous Output Current

Internal Clamp Diodes

Internal PWM Current Control

PWM MOTOR DRIVER

DUAL FULL-BRIDGE

Related parts for a2919

a2919 Summary of contents

Page 1

... The A2919SB is supplied in a 24-pin dual in-line plastic batwing package with a copper lead-frame and heat sinkable tabs for improved power dissipation capabilities. The A2919SLB is supplied in a 24-lead surface-mountable SOIC. Their batwing construction provides for maximum package power dissipation in the smallest possible construc- tion. The A2919SB/SLB are available for operation from -40° ...

Page 2

... April 27, 2007. These variants include θJA θJT Package (°C/W) (°C/W) 40 6.0 24-Lead SOIC 55 6.0 24-Lead SOIC A2919SB, A2919SLB and A2919SLBTR. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Ambient Packing Temperature (°C) 31 per tube – 1000 per reel – ...

Page 3

... DUAL FULL-BRIDGE MOTOR DRIVER A2919SLB PHASE REF GROUND 18 7 GROUND 8 LOGIC SUPPLY REF 1 14 PHASE PWM CURRENT-CONTROL CIRCUITRY 'B' PACKAGE, CHANNEL 1 PIN NUMBERS SHOWN ...

Page 4

DUAL FULL-BRIDGE MOTOR DRIVER ELECTRICAL CHARACTERISTICS 5.0 V (unless otherwise noted). REF Characteristic Output Drivers (OUT or OUT A Motor Supply Range Output Leakage Current Output Sustaining Voltage Output Saturation Voltage Clamp Diode Leakage Current ...

Page 5

... DUAL FULL-BRIDGE MOTOR DRIVER PWM CURRENT CONTROL The A2919SB/SLB dual bridges are designed to drive both windings of a bipolar stepper motor. Output current is sensed and controlled independently in each bridge by an external sense resistor (R comparator, and monostable multivibrator. When the bridge is turned ON, current increases in ...

Page 6

... The PHASE input to each bridge determines the All four drivers in the bridge output can be turned OFF = l 2.4 V) resulting in a fast current 0 1 Varying the reference voltage (V REF Thermal protection circuitry turns OFF all drivers when The A2919SB/SLB output drivers are optimized for , and I inputs provides continu- ...

Page 7

DUAL FULL-BRIDGE MOTOR DRIVER FROM 9 9 µ REF 12 820 pF 56 kΩ TYPICAL APPLICATION V BB ...

Page 8

... NOTES: 1. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece. 2. Lead thickness is measured at seating plane or below. 3. Lead spacing tolerance is non-cumulative. 4. Exact body and lead configuration at vendor’s option within limits shown. A2919SB Dimensions in Inches (controlling dimensions) NOTE ...

Page 9

... The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other rights of third parties which may result from its use. A2919SLB Dimensions in Inches (for reference only ...

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