DUAL FULL-BRIDGE MOTOR DRIVER UDN2917EB motor driver designed dri

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DUAL FULL-BRIDGE MOTOR DRIVER UDN2917EB motor driver designed dri

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SENSE PHASE ENABLE LOGIC SUPPLY
DUAL FULL-BRIDGE MOTOR DRIVER
UDN2917EB motor driver designed drive both windings bipolar stepper motor bidirectionally control motors. Both bridges capable sustaining include internal pulse-width modulation (PWM) control output current
VREF
current control, maximum output current determined user's selection reference voltage sensing resistor. logic-level inputs select output current limits 33%, 67%, 100% maximum level. PHASE input each bridge determines load current direction. Active-low 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. UDN2917EB supplied 44-lead power PLCC surfacemount applications. batwing construction provides maximum package power dissipation smallest possible construction. UDN2917EB provided operation over ambient temperature range -20°C +85°C.
Dwg. PP-021
Dwg. PP-021
ABSOLUTE MAXIMUM RATINGS
+150°C
Motor Supply Voltage, Output Current, IOUT ±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, -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
ENABLE
PHASE
LOAD SUPPLY
SENSE
Continuous Output Current Output Sustaining Voltage Internal Clamp Diodes Digital Control Output Current Internal Thermal Shutdown Circuitry Similar Dual PBL3770
Always order complete part number: UDN2917EB
2917 DUAL FULL-BRIDGE MOTOR DRIVER
CURRENT-CONTROL CIRCUITRY
CHANNEL NUMBERS SHOWN.
SENSE
SHOT
SOURCE DISABLE
Dwg. EP-007-2A
ALLOWABLE PACKAGE POWER DISSIPATION WATTS
TRUTH TABLE
12.5
Enable
Phase
OutA
OutB
Don't care High impedance
TEMPERATURE
Dwg. GP-020B
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1991, 2004 Allegro MicroSystems, Inc.
2917 DUAL FULL-BRIDGE MOTOR DRIVER
ELECTRICAL CHARACTERISTICS +25°C, 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 trip point) VREF VREF /VSENSE Inputs Inputs Operating Thermal Shutdown Temp. Total Logic Supply Current ICC(ON) ICC(OFF) Load Load 13.5 25.5 <1.0 -3.0 -200 10.5 16.5 34.5 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. Pulse test (<10 ms).
www.allegromicro.com
2917 DUAL FULL-BRIDGE MOTOR DRIVER
APPLICATIONS INFORMATION
CURRENT CONTROL UDN2917EB dual bridge 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 sensed external sense resistor until sense voltage (VSENSE) reaches level comparator's input: ITRIP VREF 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 will normally decay, 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 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 fixed time (toff) short. This circuitry prevents source driver from being re-enabled until load current decayed below ITRIP level.
Dwg. WM-003-1A
OUTPUT CURRENT WAVEFORM
PHASE
TRIP
LOAD CURRENT PATHS
BRIDGE SOURCE
Dwg. EP-006-1
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2917 DUAL FULL-BRIDGE MOTOR DRIVER
CURRENT-CONTROL TRUTH TABLE
Output Current VREF ITRIP VREF ITRIP VREF ITRIP
Loads with high distributed capacitances result high turn-on current peaks. This peak (appearing across will attempt trip comparator, resulting erroneous current control high-frequency oscillations. external RCCC low-pass filter needed delay action comparator. LOGIC CONTROL OUTPUT CURRENT logic level inputs allow digital selection motor winding current 100%, 67%, 33%, maximum level table. output current condition turns drivers bridge used output enable function. These logic level inputs greatly enhance implementation µP-controlled drive formats. During half-step operations, inputs allow control motor constant torque between positions eightstep sequence. This accomplished digitally selecting 100% drive current when only phase drive current when phases 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. GENERAL avoid excessive voltage spikes LOAD SUPPLY (VBB), large-value capacitor should connected from ground close possible device. Under circumstances should voltage LOAD SUPPLY 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 (VEN resulting fast current decay through internal output clamp flyback diodes. fast current decay desirable half-step high-speed applications. logic inputs float high; ENABLE input must tied used. Varying reference voltage (VREF) provides continuous control peak load current micro-stepping applications, within specified limits VREF. 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 re-enabled when junction temperature cools +145°C.
www.allegromicro.com
2917 DUAL FULL-BRIDGE MOTOR DRIVER
UDN2917EB
Dimensions Inches (controlling dimensions)
0.319 0.291 0.021 0.013 0.695 0.685 0.656 0.650 0.319 0.291 0.050
INDEX AREA
0.032 0.026
0.020
0.656 0.650 0.695 0.685
Dwg. MA-005-44A
0.180 0.165
Dimensions Millimeters (for reference only)
8.10 7.39 0.533 0.331 17.65 17.40 16.662 16.510
INDEX AREA
0.812 0.661
8.10 7.39 1.27
0.51
4.57 4.20
16.662 16.510 17.65 17.40
Dwg. MA-005-44A
NOTES: MO-047AC except terminal shoulder height. Webbed lead frame. Leads 7-17 29-39 internally piece. Lead spacing tolerance non-cumulative. Exact body lead configuration vendor's option within limits shown. Supplied standard sticks/tubes devices "TR" part number tape reel.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
2917 DUAL FULL-BRIDGE MOTOR DRIVER
products described here manufactured under more U.S. patents U.S. patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro products authorized critical components life-support devices systems without express written approval. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use.
www.allegromicro.com

DUAL FULL-BRIDGE MOTOR DRIVER UDN2917EB motor driver designed dri

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