DUAL FULL-BRIDGE MOTOR DRIVER A2918SWH A2918SWV motor drivers des

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DUAL FULL-BRIDGE MOTOR DRIVER A2918SWH A2918SWV motor drivers des

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DUAL FULL-BRIDGE MOTOR DRIVER
DUAL FULL-BRIDGE MOTOR DRIVER
A2918SWH A2918SWV motor drivers designed drive both windings bipolar stepper motor bidirectionally control motors. bridges capable sustaining include internal pulse-width modulation (PWM) control output current current control, maximum output current determined user's selection reference voltage sensing resistor. PHASE input each bridge determines load current direction. Active ENABLE inputs control four drivers each bridge. bridges include both ground clamp flyback diodes protection against inductive transients. Internally generated delays prevent cross-over currents when switching current direction. Special power-up sequencing required. Thermal protection circuitry disables outputs chip temperature exceeds safe operating limits. A2918SWH/V supplied 18-lead power-tab package with staggered lead forming. internally insulated from device requires external isolation. A2918SWH/V available operation from -40°C +85°C. order, change suffix from 'S-' 'E-'. These devices also available special order operation +125°C.
Data Sheet 29319.24A
OUT1A OUT2A OUT2B LOAD SPLY SENSE ENABLE2 PHASE2 GROUND LOGIC SPLY PHASE1 ENABLE1 REFERENCE SENSE1 OUT1B
VREF
Dwg. PP-051
ABSOLUTE MAXIMUM RATINGS +150°C
Motor Supply Voltage, Output Current, IOUT (tw20 ±1.75 (Continuous) ±1.5 Logic Supply Voltage, Logic Input Voltage Range, -0.3 +7.0 Output Emitter Voltage, Package Power Dissipation, Graph Operating Temperature Range, -20°C +85°C Storage Temperature Range, -40°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
±1.5 Continuous Output Current Output Sustaining Voltage Internal Current Control Output Saturation Voltage Internal Clamp Diodes Internal Thermal Shutdown Circuitry Similar Dual PBL3718 Dual PBL3770
Always order complete part number: Part Number A2918SWH A2918SWV Application Horizontal Mount Vertical Mount
DUAL FULL-BRIDGE MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
LOGIC SUPPLY LOAD SUPPLY
ENABLE1
PHASE
PHASE
ENABLE2
SOURCE DISABLE VREF
SOURCE DISABLE
SHOT
SHOT
SENSE
SENSE
REFERENCE
GROUND
Dwg. FP-033
ALLOWABLE PACKAGE POWER DISSIPATION WATTS
TRUTH TABLE
Enable Don't care High impedance Phase OutA OutB
TEMPERATURE
Dwg. GP-043
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1991, 1993, Allegro MicroSystems, Inc.
DUAL FULL-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS +25°C, 4.75 5.25 VREF (unless otherwise noted).
Limits Characteristic Output Drivers (OUTA OUTB) Motor Supply Range Output Leakage Current ICEX VOUT VOUT Output Sustaining Voltage Output Saturation Voltage VCE(sus) VCE(SAT) IOUT ±1.5 Sink Driver, IOUT +1.0 Sink Driver, IOUT +1.5 Source Driver, IOUT -1.0 Source Driver, IOUT -1.5 Clamp Diode Leakage Current Clamp Diode Forward Voltage Driver Supply Current IBB(ON) IBB(OFF) Control Logic Input Voltage VIN(1) VIN(0) Input Current IIN(1) IIN(0) Reference Voltage Range Current Limit Threshold Thermal Shutdown Temp. Total Logic Supply Current VREF VREF/VSENSE ICC(ON) ICC(OFF) Load Load Inputs Inputs Operating Trip Point <1.0 -3.0 -200 10.5 Both Bridges Load Both Bridges <1.0 <-1.0 <1.0 Symbol Test Conditions Min. Typ. Max. Units
Negative current defined coming (sourcing) specified device pin. Typical Data design information only.
DUAL FULL-BRIDGE MOTOR DRIVER
OUTPUT CURRENT WAVEFORM APPLICATIONS INFORMATION
Current Control A2918SWH/V dual bridges designed drive both windings bipolar stepper motor. Output current sensed controlled independently each bridge external sense resistor (RS), internal comparator, internal monostable multivibrator. When bridge turned current increases motor winding sensed until sense voltage (VSENSE) reaches level comparator's input: ITRIP VREF/10
Dwg. WM-003-1A
PHASE
TRIP
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 toff, therefore magnitude current decrease, determined monostable's external timing components, where toff RTCT within range 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. Special circuitry been included prevent runaway current control when toff short. This circuitry prevents source driver from being re-enabled until load current decayed below ITRIP level. Loads with high distributed capacitances result high turn-ON current peaks. This peak, appearing across will attempt trip comparator, resulting possible erroneous current control high-frequency oscillations. external RCCC low-pass filter used delay action comparator, thus ignore turn-on spikes.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
DUAL FULL-BRIDGE MOTOR DRIVER
General avoid excessive voltage spikes LOAD SUPPLY (VBB), large-value capacitor should connected from ground close possible device. Under circumstances should voltage exceed 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 OFF, with 2.4, resulting fast current decay through internal ground clamp flyback diodes. fast current decay desirable half-step high-speed applications. ENABLE input must tied used. Varying reference voltage (VREF) provides continuous control peak load current. Thermal protection circuitry turns drivers when junction temperature reaches approximately +170°C. intended only protect device from failures excessive junction temperature should imply that output short circuits permitted. output drivers re-enabled when junction temperature cools approximately +145°C.
LOAD CURRENT PATHS
BRIDGE SOURCE
Dwg. EP-006-1
DUAL FULL-BRIDGE MOTOR DRIVER
A2918SWH horizontal mounting
Dimensions Inches (Based 0.03937")
1.228 1.213 0.968 0.953 0.653 0.638 0.196 0.182 0.126 0.150 0.070 0.063
0.131
0.120
0.637 0.623
0.397 0.382 0.204 0.158
0.519 0.504
0.141 0.095 0.022
1.240 1.225
0.091 0.083 0.260 0.213 0.318 0.272
0.086 0.040
0.033 0.022
0.066 ±0.016
Dwg. MP-006
Dimensions Millimeters
31.2 30.8 3.35 3.05 24.6 24.2 16.6 16.2
16.2 15.8
10.1
13.2 12.8
0.57 0.54
31.5 31.1
0.85 0.55
1.68 ±0.4
Dwg. MP-006
NOTES:
Exact body lead configuration vendor's option within limits shown. Lead spacing tolerance non-cumulative.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
DUAL FULL-BRIDGE MOTOR DRIVER
A2918SWV vertical mounting
Dimensions Inches (Based 0.03937")
1.228 1.213 0.968 0.953 0.131 0.120 0.653 0.638 0.196 0.182 0.126 0.150 0.070 0.063
0.637 0.623
0.397 0.382
0.519 0.283 0.504 0.245 0.421 0.363 0.104 0.089
0.033 0.022
0.066 ±0.027 1.240 1.225
0.022 0.185 0.130
Dwg. MP-004
Dimensions Millimeters
31.2 30.8 24.6 24.2 3.35 3.05 16.6 16.2
16.2 15.8
10.1
13.2 12.8
2.65 2.25
10.7 0.85 0.55
1.68 ±0.7 31.5 31.1
0.57 0.54
Dwg. MP-004
NOTES:
Exact body lead configuration vendor's option within limits shown. Lead spacing tolerance non-cumulative.
DUAL FULL-BRIDGE MOTOR DRIVER
MOTOR DRIVERS SELECTION GUIDE
Function 3-Phase Controller/Drivers Hall-Effect Latched Sensors 2-Phase Hall-Effect Sensor/Controller Hall-Effect Complementary Output Sensor 2-Phase Hall-Effect Sensor/Driver 2-Phase Hall-Effect Sensor/Driver Hall-Effect Comp. Output Sensor/Driver 3-Phase Back-EMF Controller/Driver 3-Phase Controller/DMOS Driver 3-Phase Back-EMF Controller/Driver Current Controlled Dual Full Bridge Current Controlled Dual Full Bridge Current Controlled Dual Full Bridge Current Controlled Dual Full Bridge Dual Full Bridge Driver Current Controlled Full Bridge Current Controlled Full Bridge Current Controlled Dual Full Bridge Current Controlled Dual Full Bridge Unipolar Stepper Motor Quad Driver Unipolar Stepper-Motor Translator/Driver Unipolar Stepper-Motor Quad Driver Unipolar Microstepper-Motor Quad Driver Voice-Coil Motor Driver Voice-Coil Motor Driver Voice-Coil (and spindle) Motor Driver Output Ratings ±2.0 ±900 ±4.0 ±1.0 ±750 ±1.5 ±1.5 ±750 ±2.0 ±2.0 ±1.3 ±800 ±800 1.25 ±500 ±800 ±350 Part Number 2936 2936-120 3175 3177 3235 3275 3625 3626 5275 8902-A 8925 8984 2916 2917 2918 2919 2998 3952 3953 3961 3962 2544 5804 7024 7029 7042 8932-A 8958 8984 INTEGRATED CIRCUITS BRUSHLESS MOTORS
INTEGRATED BRIDGE DRIVERS BIPOLAR STEPPER MOTORS
OTHER INTEGRATED CIRCUIT PMCM MOTOR DRIVERS
Current maximum specified test condition, voltage maximum rating. specification sustaining voltage limits over-current protection voltage limits. Negative current defined coming (sourcing) output. Complete part number includes additional characters indicate operating temperature range package style.
Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements design products. Components made under military approvals will accordance with approval requirements. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringements patents other rights third parties which result from use.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

DUAL FULL-BRIDGE MOTOR DRIVER A2918SWH A2918SWV motor drivers des

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