DUAL FULL-BRIDGE MOTOR DRIVER A2927SEB motor driver designed driv
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DUAL FULL-BRIDGE MOTOR DRIVER
DUAL FULL-BRIDGE MOTOR DRIVER
A2927SEB 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
Data Sheet 29319.23
SENSE
PHASE
VREF
ENABLE
LOGIC SUPPLY
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. 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. A2927SEB supplied 44-lead power PLCC surfacemount applications. batwing construction provides maximum package power dissipation smallest possible construction.
ENABLE
LOAD SUPPLY
SENSE
PHASE
Dwg. PP-021
ABSOLUTE MAXIMUM RATINGS +150°C
Motor Supply Voltage, Output Current, IOUT ±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
Output Current Output Sustaining Voltage Internal Flyback Diodes Digital Control Output Current Undervoltage Lockout Internal Thermal Shutdown Circuitry
Always order complete part number: A2927SEB
DUAL FULL-BRIDGE MOTOR DRIVER
CURRENT-CONTROL CIRCUITRY
CHANNEL NUMBERS SHOWN.
SENSE
SHOT
SOURCE DISABLE
Dwg. EP-007-4
TRUTH TABLE
ALLOWABLE PACKAGE POWER DISSIPATION WATTS
12.5
Enable
Phase
OutA
OutB
Don't care High impedance
°C/W
TEMPERATURE
Dwg. GP-020-1
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1997 Allegro MicroSystems, Inc.
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 IOUT ±1.5 VOUT VOUT Output Saturation Voltage VCE(SAT) Sink Driver, IOUT +1.0 Sink Driver, IOUT +1.5 Source Driver, IOUT -1.0 Source Driver, IOUT -1.5 Flyback Diode Forward Volt. 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 -5.0 Symbol Test Conditions Min. Typ. Max. Units
Negative current defined coming (sourcing) specified device pin. Typical Data design information only. Pulse test (<10 ms).
DUAL FULL-BRIDGE MOTOR DRIVER
APPLICATIONS INFORMATION
CURRENT CONTROL: UDN2927EB 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 external 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.
OUTPUT CURRENT WAVEFORM
PHASE
TRIP
Dwg. WM-003-1A
LOAD CURRENT PATHS
BRIDGE SOURCE
Dwg. EP-006-14
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
DUAL FULL-BRIDGE MOTOR DRIVER
CURRENT-CONTROL TRUTH TABLE
Output Current VREF ITRIP VREF ITRIP VREF ITRIP
GENERAL: Both bridges have internal flyback diodes (connected from outputs VBB) protection against inductive transients. External ground-clamp diodes (connected from outputs ground) required; Schottky ground-clamp diodes recommended minimize onchip power dissipation. avoid excessive voltage spikes LOAD SUPPLY terminal (VBB), large-value capacitor should connected from ground close possible device. Under circumstances should voltage LOAD SUPPLY exceed low-value (0.1 ceramic capacitor this terminal used high-frequency noise suppression. 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 flyback external groundclamp diodes. fast current decay desirable halfstep 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 approximately +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 approximately +160°C.
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 eight-step 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.
DUAL FULL-BRIDGE MOTOR DRIVER
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 0.331 0.533 17.40 17.65 16.510 16.662
INDEX AREA
0.661 0.812
8.10 7.39 1.27
0.51
4.20 4.57
16.510 16.662 17.65 17.40
Dwg. MA-005-44A
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
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DUAL FULL-BRIDGE MOTOR DRIVER
BRIDGE HALF-BRIDGE DRIVERS SELECTION GUIDE
ORDER OUTPUT CURRENT OUTPUT VOLTAGE
Output Ratings ±750 ±800 ±900 ±1000 ±1300 ±1500 Description Dual Full Bridge Dual Full Bridge Dual Full Bridge Back-EMF Controller/Driver Back-EMF Controller/Driver Full Bridge Dual Full Bridge Dual Full Bridge Dual Full Bridge Microstepping Full Bridge Brushless Controller/Driver Dual Full Bridge Full-Bridge Full-Bridge Control Control Brushless Controller/Driver Internal Diodes
Features Outputs Bipolar Bipolar Bipolar DMOS NMOS Bipolar Bipolar Bipolar Bipolar Darlington Darlington Darlington Darlington Darlington Darlington Bipolar DMOS Internal Protection Part Number 2916 2919 3964 8902-A 8984 3953 2917 2918 2927 3955 2936 2998 3951 3952 2962 2961 8925
±2000
±3000 ±3400 ±4000
Current maximum specified test condition, voltage maximum rating. specification sustaining voltage limits over-current protection voltage limits. Complete part number includes additional characters indicate operating temperature range package style. Internal flyback diodes only.
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
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