DUAL DMOS FULL-BRIDGE DRIVER Data Sheet 29319.32 CONNECTION
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(Subject change without notice) October 1999 Designed interface between external control logic inductive loads such relays, solenoids, motors stepper motors, A3971SLB operate with continuous output currents ±2.5 operating voltages
DUAL DMOS FULL-BRIDGE DRIVER
Data Sheet 29319.32
CONNECTION LOGIC GROUND OUT1A LOAD SUPPLY1 GROUND GROUND SENSE1 OUT1B PWM1
LOGIC SUPPLY PWM2 OUT2A LOAD SUPPLY2 GROUND GROUND SENSE2 OUT2B
VBB1
VBB2
rDS(on) DMOS output drivers provide power dissipation during operation. Internal charge pump circuitry used create boosted voltage fully enhance high-side DMOS switches. Three TTL-compatible logic-input terminals bridge allow flexibility configuring control. Internal circuit protection includes thermal shutdown with hysteresis, crossover-current protection. Special power sequencing required. A3971SLB supplied 24-lead plastic SOIC with copper batwing tab. power ground potential needs electrical isolation.
CHARGE PUMP
LOGIC
LOGIC
Dwg. PP-069-2
ABSOLUTE MAXIMUM RATINGS
+25°C Load Supply Voltage, Output Current, IOUT Continuous ±2.5 Transient (<500 Logic Supply Voltage, Sense Voltage, VSENSE Logic Input Voltage Range, -0.3 High-Side Gate Voltage Package Power Dissipation, Operating Temperature Range, -20°C +85°C Junction Temperature, +150°C Storage Temperature Range, -55°C +150°C
Output duty cycle, ambient temperature, heat sinking limit current rating. Under conditions, exceed specified current rating junction temperature
FEATURES
±2.5 Continuous Load Current rDS(on) Outputs Typically source, sink Synchronous Rectification Control Logic Parallel Outputs Load-Current Capability Internal Undervoltage Monitor Crossover-Current Protection Source Connections External Current Sensing Thermal Shutdown Circuitry
Always order complete part number: A3971SLB
3971 DUAL DMOS FULL-BRIDGE DRIVER
FUNCTIONAL BLOCK DIAGRAM
0.22 µF/100 LOGIC SUPPLY
VOLTAGE REFERENCE
SIDE SUPPLY
CHARGE PUMP
VBB2
0.22
LOAD SUPPLY
DMOS H-BRIDGE
UVLO THERMAL SHUTDOWN
OUT2A
OUT2B
BRIDGE CONTROL LOGIC GATE DRIVE DMOS H-BRIDGE
SENSE2
(OPTIONAL)
PWM1
VBB1
PWM2
BRIDGE CONTROL LOGIC
OUT1A
OUT1B
LGND
SENSE1 (OPTIONAL)
GROUND
Dwg. FP-050
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright 1999, Allegro MicroSystems, Inc.
3971 DUAL DMOS FULL-BRIDGE DRIVER
ELECTRICAL CHARACTERISTICS +25°C, (unless otherwise noted).
Limits Characteristic Load Supply Voltage Range Logic Supply Voltage Range Load Supply Current Logic Supply Current Output Drivers Output Leakage Current IDSS rDS(on) VIN(0) VIN(1) Logic Input Current IIN(0) IIN(1) Propagation Delay Time IOUT ±2.5 change source change sink change source change sink Disable source Disable sink Thermal Shutdown Temperature Thermal Shutdown Hysteresis UVLO Threshold UVLO Hysteresis VUVLO VUVLO Increasing 4.15 0.15 VOUT VOUT Output Resistance High-side switch Low-side switch Body Diode Forward Voltage Source diode, Sink diode, High-Side Gate Voltage Control Logic Logic Input Voltage <1.0 -5.0 0.22 reference <1.0 <-1.0 Symbol Test Conditions Operating Operating Operating, each supply, load Operating Min. Typ. Max. Units
NOTES: Typical Data design information only. Negative current defined coming (sourcing) specified device terminal.
3971 DUAL DMOS FULL-BRIDGE DRIVER
Logic Truth Table
PWMx OUTxA OUTxB Function Disable Forward Reverse Synchronous Rectification/ Slow Decay Chop
Terminal List
Terminal Name LGND OUT1A VBB1 SENSE1 OUT1B PWM1 OUT2B SENSE2 VBB2 OUT2A PWM2 Description (Internal) connection Logic ground Control input, bridge Output bridge Load supply voltage, bridge Ground Sense resistor, bridge Output bridge Control input, bridge Control input, bridge Charge-pump capacitor Charge-pump capacitor Reservoir capacitor Control input, bridge Output bridge Sense resistor, bridge Ground Load supply voltage, bridge Output bridge Control input, bridge Control input, bridge Logic supply voltage
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3971 DUAL DMOS FULL-BRIDGE DRIVER
Dimensions Inches
(for reference only)
0.0125 0.0091
0.2992 0.2914
0.419 0.394
0.050 0.016 0.020 0.013
0.6141 0.5985
0.050
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-24A
NOTES:1. Exact body lead configuration vendor's option within limits shown. Lead spacing tolerance non-cumulative Webbed lead frame. Leads internally piece.
3971 DUAL DMOS FULL-BRIDGE DRIVER
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
2.65 2.35 0.10 MIN.
Dwg. MA-008-24A
NOTES:1. Exact body lead configuration vendor's option within limits shown. Lead spacing tolerance non-cumulative Webbed lead frame. Leads internally piece.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3971 DUAL DMOS FULL-BRIDGE DRIVER
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; infringement patents other rights third parties which result from use.
3971 DUAL DMOS FULL-BRIDGE DRIVER
MOTOR DRIVERS SELECTION GUIDE
Function Output Ratings INTEGRATED CIRCUITS BRUSHLESS MOTORS 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 3-Phase Power MOSFET Controller Hall-Effect Complementary-Output Sensor/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 Microstepping Full Bridge Current-Controlled Microstepping Full Bridge DMOS Full Bridge Driver Current-Controlled Dual Full Bridge Current-Controlled Dual 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 Drivers Unipolar Stepper-Motor Quad Drivers Unipolar Microstepper-Motor Quad Driver Unipolar Microstepper-Motor Quad Driver Voice-Coil Motor Driver Voice-Coil Motor Driver ±2.0 ±900 ±750 ±1.5 ±1.5 ±750 ±2.0 ±2.0 ±1.3 ±1.5 ±1.5 ±2.0 ±800 ±650 ±650 ±750 1.25 ±500 ±800 2936 2936-120 3175 3177 3235 3275 3625 3626 3933 5275 8902-A 2916 2917 2918 2919 2998 3952 3953 3955 3957 3958 3964 3966 3968 6219 2544 5804 7024 7029 7026 7042 7044 8932-A 8958 Part Number
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.
Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
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