A2919SB A2919SLB motor drivers designed drive both windings bipolar st

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A2919SB A2919SLB motor drivers designed drive both windings bipolar st

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2919 DUAL FULL-BRIDGE MOTOR DRIVER
A2919SB A2919SLB motor drivers designed drive both windings bipolar stepper motor bidirectionally control motors. Both bridges capable sustaining include internal pulse width modulation (PWM) control output current outputs have been optimized output-saturation voltage drop (less than total source plus sink mA). current control, maximum output current determined user's selection reference voltage sensing resistor. logic-level inputs select output current limits 41%, 67%, 100% maximum level. PHASE input each bridge determines load current direction. bridges include both ground clamp flyback diodes protection against inductive transients. Internally generated delays prevent crossover currents when switching current direction. Special power-up sequencing required. Thermal protection circuitry disables outputs chip temperature exceeds safe operating limits. A2919SB supplied 24-pin dual in-line plastic batwing package with copper lead-frame heat sinkable tabs improved power dissipation capabilities. A2919SLB supplied 24-lead surface-mountable SOIC. Their batwing construction provides maximum package power dissipation smallest possible construction. A2919SB/SLB available operation from -40°C +85°C. order, change suffix from 'S-' 'E-'. These devices also available special order operation +125°C. applications requiring quarter-step operation, desire lower detent running current, similar UDN2916B/EB/LB preferred.
DUAL FULL-BRIDGE MOTOR DRIVER
A2919SB
OUND OUND
Data Sheet 29319.21E
LOAD OUND OUND
Dwg. -005
ABSOLUTE MAXIMUM RATINGS 150°C
Motor Supply Voltage, Output Current, IOUT (Peak, ±1.0 (Continuous) ±750 Logic Supply Voltage, Logic Input Voltage Range, -0.3 VCC+0.3 Output Emitter Voltage, Package Power Dissipation, Graph Operating Temperature Range, -20°C +85°C Storage Temperature Range, -55°C +150°C
Output current rating limited duty cycle, ambient temperature, heat sinking. Under conditions, exceed specified peak current rating junction temperature +150°C.
FEATURES
Continuous Output Current Output Sustaining Voltage Internal Clamp Diodes Internal Current Control Output Saturation Voltage Internal Thermal Shutdown Circuitry Half- Quarter-Step Operation Bipolar Stepper Motors
2919 DUAL FULL-BRIDGE MOTOR DRIVER
Selection Guide
Part Number Pb-free1 (°C/W) (°C/W) Package Packing Ambient Temperature (°C)
A2919SLB-T A2919SLBTR-T
24-Lead SOIC 24-Lead SOIC
tube 1000 reel
Pb-based variants being phased product line. variants cited this footnote production have been determined LAST TIME BUY. This classification indicates that sale this device currently restricted existing customer applications. variants should purchased design applications because obsolescence near future probable. Samples longer available. Status change October 2006. Deadline receipt LAST TIME orders: April 2007. These variants include: A2919SB, A2919SLB A2919SLBTR.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2919 DUAL FULL-BRIDGE MOTOR DRIVER
A2919SLB
ALLOWABLE PACKAGE POWER DISSIPATION WATTS
6.0°C/W
LOAD SUPPLY SENSE GROUND GROUND SENSE
PHASE GROUND GROUND LOGIC SUPPLY PHASE
SUFFIX 'B', 40°C/W
SUFFIX 'LB', 55°C/W
TEMPERATURE
Dwg. GP-049A
TRUTH TABLE
PHASE
Dwg. PP-047
OUTA
OUTB
CURRENT-CONTROL CIRCUITRY
PACKAGE, CHANNEL NUMBERS SHOWN.
SENSE
SHOT
SOURCE DISABLE
Dwg. EP-007-3
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1994 Allegro MicroSystems, Inc.
2919 DUAL FULL-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS +25°C, 150°C, 4.75 5.25 VREF (unless otherwise noted).
Limits Characteristic Output Drivers (OUTA OUTB)
Motor Supply Range Output Leakage Current ICEX Operating VOUT VOUT Output Sustaining Voltage Output Saturation Voltage VCE(sus) VCE(SAT) IOUT ±750 Sink Driver, IOUT +500 Sink Driver, IOUT +750 Source Driver, IOUT -500 Source Driver, IOUT -750 Clamp Diode Leakage Current Clamp Diode Forward Voltage Driver Supply Current IBB(ON) IBB(OFF) Both Bridges Load Both Bridges <-1.0
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Control Logic
Input Voltage VIN(1) VIN(0) Input Current IIN(1) inputs inputs Reference Voltage Range Current Limit Threshold trip point) VREF VREF VSENSE VREF VREF VREF Thermal Shutdown Temperature Total Logic Supply Current ICC(ON) ICC(OFF) Total Reference Current Fixed Off-Time IREF1 IREF2 toff Load Load VREF1 VREF2 20.7 24.4 28.0 13.5 <1.0 -200 10.5 16.5
2919 DUAL FULL-BRIDGE MOTOR DRIVER
APPLICATIONS INFORMATION
CURRENT CONTROL
A2919SB/SLB dual bridges designed drive both windings bipolar stepper motor. Output current sensed controlled independently each bridge external sense resistor (RS), internal comparator, monostable multivibrator. When bridge turned current increases motor winding flows through external sense resistor until sense voltage (VS) reaches level comparator's input: ITRIP VREF/10 comparator then triggers monostable, which turns source driver bridge. actual load current peak will slightly higher than trip point (especially low-inductance loads) because internal logic switching delays. This delay (td) typically After turn-off, motor current decays, circulating through ground-clamp diode sink transistor. source driver's time (and therefore magnitude current decrease) determined monostable's external timing components, where toff RTCT within range 1000 fixed-off time should short enough keep current chopping above audible range long enough properly regulate current. Because only slow-decay current control available, short times require additional efforts ensure proper current regulation. Factors that negatively affect ability properly regulate current when using short times include: higher motor-supply voltage, light load, longer than necessary blank time. When source driver re-enabled, winding current (the sense voltage) again allowed rise comparator's threshold. This cycle repeats itself, maintaining average motor winding current desired level. Loads with high distributed capacitances cause current spikes capable tripping comparator, resulting erroneous current control. external RCCC time delay should used delay action comparator. Depending load type, many applications will require these external components (SENSE connected
OUTPUT CURRENT WAVE FORM
toff
Dwg. WM-003-1A
LOAD CURRENT PATHS
Dwg. -006-1
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2919 DUAL FULL-BRIDGE MOTOR DRIVER
LOGIC CONTROL OUTPUT CURRENT
logic level inputs allow digital selection motor winding current 100%, 67%, 41%, maximum level table. output current condition turns drivers bridge used OUTPUT ENABLE function.
GENERAL
PHASE input each bridge determines direction motor winding current flows. internally generated deadtime (approximately prevents crossover currents that occur when switching PHASE input. four drivers bridge output turned between steps resulting fast current decay through internal output clamp flyback diodes. fast current decay desirable half-step high-speed applications. PHASE, inputs float high. Varying reference voltage (VREF) provides continuous control peak load current micro-stepping applications. Thermal protection circuitry turns drivers when junction temperature reaches +170°C. only intended protect device from failures excessive junction temperature should imply that output short circuits permitted. output drivers reenabled when junction temperature cools +145°C. A2919SB/SLB output drivers optimized output saturation voltages-less than total (source plus sink) Under normal operating conditions, when combined with excellent thermal properties batwing package design, this allows continuous operation both bridges simultaneously
CURRENT-CONTROL TRUTH TABLE
Output Current VREF/10 100% ITRIP REF/15 ITRIP VREF/24.4 ITRIP
These logic level inputs greatly enhance implementation µP-controlled drive formats. During half-step operations, allow control motor constant torque between positions eight-step sequence. This accomplished digitally selecting 100% drive current when only phase drive current when phases Logic highs both turn drivers allow rapid current decay. During quarter-step operation, allow control motor position sixteen-step sequence. This accomplished digitally selecting drive current shown table (for quadrant operation). Logic highs both turn drivers allow rapid current decay. logic control inputs also used select reduced current level (and reduced power dissipation) `hold' conditions and/or increased current (and available torque) start-up conditions.
QUARTER-STEPPING CURRENT CONTROL
Phase Current Level 100% 100% Phase Current Level 100% 100%
2919 DUAL FULL-BRIDGE MOTOR DRIVER
TYPICAL APPLICATION
STEPPER MOTOR
FROM
FROM
Dwg. EP-008B1
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2919 DUAL FULL-BRIDGE MOTOR DRIVER
A2919SB
Dimensions Inches
(controlling dimensions)
NOTE
0.014 0.008
0.430 0.280 0.240
0.300
0.070 0.045
1.280 1.230
0.100
0.005
0.210
0.015
0.150 0.115 0.022 0.014
Dwg. MA-001-25A
Dimensions Millimeters
(for reference only)
NOTE
0.355 0.204
10.92 7.11 6.10
7.62
1.77 1.15
32.51 31.24
2.54
0.13
5.33
0.39
3.81 2.93 0.558 0.356
Dwg. MA-001-25A
NOTES: Webbed lead frame. Leads internally piece. Lead thickness measured seating plane below. Lead spacing tolerance non-cumulative. Exact body lead configuration vendor's option within limits shown.
2919 DUAL FULL-BRIDGE MOTOR DRIVER
A2919SLB
Dimensions Inches
(for reference only)
0.0125 0.0091
0.2992 0.2914
0.491 0.394 0.050 0.016
0.020 0.013
0.6141 0.5985
0.050
NOTE NOTE
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-25
Dimensions Millimeters
(controlling dimensions)
0.32 0.23
7.60 7.40
10.65 10.00 1.27 0.40
0.51 0.33
15.60 15.20
1.27
NOTE NOTE
2.65 2.35 0.10 MIN.
Dwg. MA-008-25A
Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements design products. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringements patents other rights third parties which result from use.
NOTES: Webbed lead frame. Leads internally piece. Lead spacing tolerance non-cumulative. Exact body lead configuration vendor's option within limits shown.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

A2919SB A2919SLB motor drivers designed drive both windings bipolar st

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