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3971
ADVANCE INFORMATION
(Subject to change without notice) October 1, 1999 Designed to interface between external PWM control logic and inductive loads such as relays, solenoids, dc motors or stepper motors, the A3971SLB can operate with continuous output currents to 2.5 A and operating voltages to 50 V.
DUAL DMOS FULL-BRIDGE DRIVER
Data Sheet 29319.32
NO CONNECTION LOGIC GROUND S10 OUT1A LOAD SUPPLY1 GROUND GROUND SENSE1 OUT1B S11 PWM1 CP1
1 2 3 4 5 6 7 8 9 9 10 11 12
NC
VDD
24 23 22 21 20 19 18 17 16 15 14
LOGIC SUPPLY PWM2 S20 OUT2A LOAD SUPPLY2 GROUND GROUND SENSE2 OUT2B S21 VCP CP2
VBB1
VBB2
Low rDS(on) DMOS output drivers provide low power dissipation during PWM operation. Internal charge pump circuitry is used to create a boosted voltage to fully enhance the high-side DMOS switches. Three TTL-compatible logic-input terminals per bridge allow flexibility in configuring PWM control. Internal circuit protection includes thermal shutdown with hysteresis, and crossover-current protection. Special power up sequencing is not required. The A3971SLB is supplied in a 24-lead plastic SOIC with a copper batwing tab. The power tab is at ground potential and needs no electrical isolation.
CHARGE PUMP
LOGIC
LOGIC
13
Dwg. PP-069-2
ABSOLUTE MAXIMUM RATINGS
at TA = +25C Load Supply Voltage, VBB ................ 50 V Output Current, IOUT Continuous ............................. 2.5 A Transient (<500 ns) ................... 5 A Logic Supply Voltage, VDD ............................................ 7.0 V Sense Voltage, VSENSE ...................... 0.5 V Logic Input Voltage Range, VIN .................. -0.3 V to VDD + 0.3 V High-Side Gate Voltage ........... VBB + 8 V Package Power Dissipation, PD ............................................. 2.2 W Operating Temperature Range, TA ............................. -20C to +85C Junction Temperature, TJ ............. +150C Storage Temperature Range, TS ........................... -55C to +150C
Output duty cycle, ambient temperature, and heat sinking may limit current rating. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150 C.
FEATURES
s 2.5 A, Continuous Load Current s Low rDS(on) Outputs Typically 325 m source, 175 m sink s Synchronous Rectification via Control Logic s Parallel Outputs for 5 A Load-Current Capability s Internal Undervoltage Monitor s Crossover-Current Protection s Source Connections for External Current Sensing s Thermal Shutdown Circuitry
Always order by complete part number: A3971SLB .
3971 DUAL DMOS FULL-BRIDGE DRIVER
FUNCTIONAL BLOCK DIAGRAM
0.22 F/100 V LOGIC SUPPLY
13
CP2
12
CP1 VCP
14
VDD
24
V REF
VOLTAGE REFERENCE
LOW SIDE SUPPLY
CHARGE PUMP
VBB2
20
0.22 F 50 V
LOAD SUPPLY
DMOS H-BRIDGE
VCP
UVLO & THERMAL SHUTDOWN
OUT2A
21
OUT2B
16
S10 S11
3 10
BRIDGE 1 CONTROL LOGIC GATE DRIVE DMOS H-BRIDGE
17
SENSE2
R S , CS (OPTIONAL)
PWM1 11
5
VBB1
S20 22 S21 15 PWM2
23
BRIDGE 2 CONTROL LOGIC
4
OUT1A
9
OUT1B
LGND
2 8
R S, C S SENSE1 (OPTIONAL)
6 GROUND
7
18 19
Dwg. FP-050
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Copyright (c) 1999, Allegro MicroSystems, Inc.
3971 DUAL DMOS FULL-BRIDGE DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25C, VBB = 50 V, VDD = 5.0 V (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) VF VCP VIN(0) VIN(1) Logic Input Current IIN(0) IIN(1) Propagation Delay Time tPD VIN = 0 V VIN = 5.0 V IOUT = 2.5 A, 50% to 90% PWM change to source OFF PWM change to sink OFF PWM change to source ON PWM change to sink ON Disable to source ON Disable to sink ON Thermal Shutdown Temperature Thermal Shutdown Hysteresis UVLO Threshold UVLO Hysteresis TJ TJ VUVLO VUVLO Increasing VDD -- -- -- -- -- -- -- -- 3.9 -- 50 60 565 665 150 250 165 15 4.15 0.15 -- -- -- -- -- -- -- -- 4.4 -- ns ns ns ns ns ns C C V V VOUT = VBB VOUT = 0 V Output On Resistance High-side switch Low-side switch Body Diode Forward Voltage Source diode, IF = 2.5 A Sink diode, IF = 2.5 A High-Side Gate Voltage Control Logic Logic Input Voltage -- 2.0 -- -- -- -- <1.0 20 0.8 -- -5.0 50 V V A A C = 0.22 F, reference VBB -- -- -- -- -- -- 6.0 <1.0 <-1.0 325 175 1.2 1.0 6.5 20 -20 375 200 -- -- 7.0 A mA m m V V V Symbol VBB VDD IBB IDD Test Conditions Operating Operating Operating, each supply, no load Operating Min. 10 4.5 -- -- Typ. -- 5.0 -- -- Max. 50 5.5 3.0 5.0 Units V V mA mA
NOTES: 1. Typical Data is for design information only. 2. Negative current is defined as coming out of (sourcing) the specified device terminal.
3971 DUAL DMOS FULL-BRIDGE DRIVER
Logic Truth Table
PWMx X 0 0 0 1 1 1 Sx0 0 0 1 1 0 1 1 Sx1 0 1 0 1 1 1 0 OUTxA Z L H L L L L OUTxB Z H L L L L L Function Disable Forward Reverse Synchronous Rectification/ Slow Decay Chop
Terminal List
Terminal 1 2 3 4 5 6, 7 8 9 10 11 12 13 14 15 16 17 18, 19 20 21 22 23 24 Name NC LGND S10 OUT1A VBB1 GND SENSE1 OUT1B S11 PWM1 CP1 CP2 VCP S21 OUT2B SENSE2 GND VBB2 OUT2A S20 PWM2 VDD Description No (Internal) connection Logic ground Control input, bridge 1 Output A, bridge 1 Load supply voltage, bridge 1 Ground Sense resistor, bridge 1 Output B, bridge 1 Control input, bridge 1 Control input, bridge 1 Charge-pump capacitor Charge-pump capacitor Reservoir capacitor Control input, bridge 2 Output B, bridge 2 Sense resistor, bridge 2 Ground Load supply voltage, bridge 2 Output A, bridge 2 Control input, bridge 2 Control input, bridge 2 Logic supply voltage
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3971 DUAL DMOS FULL-BRIDGE DRIVER
Dimensions in Inches
(for reference only)
24 13
0.0125 0.0091
0.2992 0.2914
0.419 0.394
0.050 0.016 0.020 0.013
1
2
3 0.6141 0.5985
0.050
BSC
0 TO 8
0.0926 0.1043 0.0040 MIN.
Dwg. MA-008-24A in
NOTES:1. Exact body and lead configuration at vendor's option within limits shown. 2. Lead spacing tolerance is non-cumulative 3. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
3971 DUAL DMOS FULL-BRIDGE DRIVER
Dimensions in Millimeters
(controlling dimensions)
24 13
0.32 0.23
7.60 7.40
10.65 10.00
1.27 0.40 0.51 0.33
1
2
3 15.60 15.20
1.27
BSC
0 TO 8
2.65 2.35 0.10 MIN.
Dwg. MA-008-24A mm
NOTES:1. Exact body and lead configuration at vendor's option within limits shown. 2. Lead spacing tolerance is non-cumulative 3. Webbed lead frame. Leads 6, 7, 18, and 19 are internally one piece.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000
3971 DUAL DMOS FULL-BRIDGE DRIVER
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the design of its products. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of third parties which may result from its use.
3971 DUAL DMOS FULL-BRIDGE DRIVER
MOTOR DRIVERS SELECTION GUIDE
Function Output Ratings * INTEGRATED CIRCUITS FOR BRUSHLESS DC 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 PWM Current-Controlled Dual Full Bridge PWM Current-Controlled Dual Full Bridge PWM Current-Controlled Dual Full Bridge PWM Current-Controlled Dual Full Bridge Dual Full-Bridge Driver PWM Current-Controlled Full Bridge PWM Current-Controlled Full Bridge PWM Current-Controlled Microstepping Full Bridge PWM Current-Controlled Microstepping Full Bridge DMOS Full Bridge PWM Driver PWM Current-Controlled Dual Full Bridge PWM Current-Controlled Dual Full Bridge PWM Current-Controlled Dual Full Bridge PWM 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 A 10 mA 20 mA 20 mA 900 mA 400 mA -- 300 mA 900 mA 750 mA 1.5 A 1.5 A 750 mA 2.0 A 2.0 A 1.3 A 1.5 A 1.5 A 2.0 A 800 mA 650 mA 650 mA 750 mA 1.8 A 1.25 A 1A 3A 1.2 A 3A 500 mA 800 mA 45 V 24 V 25 V 25 V 14 V 26 V 28 V 60 V 14 V 45 V 45 V 45 V 45 V 50 V 50 V 50 V 50 V 50 V 50 V 33 V 30 V 30 V 45 V 50 V 50 V 46 V 46 V 46 V 46 V 6V 16 V 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 FOR DC AND BIPOLAR STEPPER MOTORS
OTHER INTEGRATED CIRCUIT & PMCM MOTOR DRIVERS
Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or over-current protection voltage limits. Negative current is defined as coming out of (sourcing) the output. Complete part number includes additional characters to indicate operating temperature range and package style.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000

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