FULL-BRIDGE DRIVER. A3971 Datasheet


A3971 DRIVER. Datasheet pdf. Equivalent


Part Number

A3971

Description

DUAL DMOS FULL-BRIDGE DRIVER

Manufacture

Allegro

Total Page 8 Pages
Datasheet
Download A3971 Datasheet


A3971
3971
ADVANCE INFORMATION
(Subject to change without notice)
May 2, 2000
DUAL DMOS
FULL-BRIDGE DRIVER
Designed to interface between external PWM control logic and
NO
CONNECTION
1
NC
LOGIC
GROUND
2
VDD
24
LOGIC
SUPPLY
23 PWM2
inductive loads such as relays, solenoids, dc motors, or stepper motors,
each full bridge can operate with output currents to ±2.5 A and operating
voltages to 50 V.
S10 3
OUT1A 4
22 S20
21 OUT2A
Low rDS(on) DMOS output drivers provide low power dissipation
during PWM operation. Internal charge pump circuitry is used to create
LOAD
SUPPLY1
5
VBB1
LOAD
20
VBB2
SUPPLY2
a boosted voltage to fully enhance the high-side DMOS switches.
GROUND 6
GROUND 7
tSENSE1 8
cOUT1B 99
uS11 10
dPWM1 11
ro lyCP1 12
CHARGE PUMP
19 GROUND
18 GROUND
17 SENSE2
16 OUT2B
15 S21
14 VCP
13 CP2
Dwg. PP-069-2
d P OnABSOLUTE MAXIMUM RATINGS
at TA = +25°C
e eLoad Supply Voltage, VBB ................ 50 V
u cOutput Current, IOUT
tin nTransient (<500 ns) ................... ±5 A
Logic Supply Voltage,
n reVDD ............................................ 7.0 V
Sense Voltage, VSENSE ...................... 0.5 V
o feLogic Input Voltage Range,
VIN .................. -0.3 V to VDD + 0.3 V
c eHigh-Side Gate Voltage ........... VBB + 8 V
isPackage Power Dissipation,
RPD ............................................. 2.2 W
D rOperating Temperature Range,
oTA ............................. -20°C to +85°C
FJunction Temperature, TJ ............. +150°C
Three TTL-compatible logic-input terminals per bridge allow flex-
ibility 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 electri-
cal isolation.
FEATURES
s ±2.5 A Load Current Capability per Bridge
s Parallel Outputs for 5 A Load-Current Capability
s Low rDS(on) Outputs
Typically 325 msource, 175 msink
s Synchronous Rectification via Control Logic
s Internal Undervoltage Monitor
s Crossover-Current Protection
Storage Temperature Range,
s Source Connections for External Current Sensing
TS ........................... -55°C to +150°C
s Thermal Shutdown Circuitry
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 tempera-
ture of 150 °C.
Always order by complete part number: A3971SLB .

A3971
3971
DUAL DMOS
FULL-BRIDGE DRIVER
LOGIC
SUPPLY
VDD
24
S10 3
S11 10
PWM1 11
S20 22
S 21 15
PWM2 23
LGND
2
FUNCTIONAL BLOCK DIAGRAM
0.22 µF/100 V
VOLTAGE
REFERENCE
V REF
LOW SIDE
SUPPLY
CP2
13
CP1
12
CHARGE
PUMP
UVLO &
THERMAL
SHUTDOWN
DMOS H-BRIDGE
V CP
BRIDGE 1
CONTROL
LOGIC
BRIDGE 2
CONTROL
LOGIC
GATE
DRIVE
DMOS H-BRIDGE
67
GROUND
18 19
14 V CP
0.22 µF
50 V
20 V BB2
LOAD
SUPPLY
OUT 2A
21
16 OUT 2B
SENSE2
17
RS, CS
(OPTIONAL)
5
V BB1
4 OUT1A
9 OUT1B
SENSE1
8
RS , CS
(OPTIONAL)
Dwg. FP-050
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 2000, 2002 Allegro MicroSystems, Inc.


Features Data Sheet 29319.32 3971 ADVANCE INFOR MATION (Subject to change without notic e) May 2, 2000 DUAL DMOS FULL-BRIDGE D RIVER Designed to interface between ex ternal PWM control logic and NO CONNEC TION 1 NC LOGIC GROUND 2 VDD 24 LOGIC SUPPLY 23 PWM2 inductive loads such as relays, solenoids, dc motors, o r stepper motors, each full bridge can operate with output currents to ±2.5 A and operating voltages to 50 V. S10 3 OUT1A 4 22 S20 21 OUT2A Low rDS(on) DMOS output drivers provide low power d issipation during PWM operation. Intern al charge pump circuitry is used to cre ate LOAD SUPPLY1 5 VBB1 LOAD 20 VB B2 SUPPLY2 a boosted voltage to fully enhance the high-side DMOS switches. LOGIC LOGIC GROUND 6 GROUND 7 tSENSE1 8 cOUT1B 99 uS11 10 dPWM1 11 ro lyCP1 1 2 CHARGE PUMP 19 GROUND 18 GROUND 17 SENSE2 16 OUT2B 15 S21 14 VCP 13 CP2 D wg. PP-069-2 d P OnABSOLUTE MAXIMUM RA TINGS at TA = +25°C e eLoad Supply Vol tage, VBB ................ 50 V u cOutput Current, IOUT tin nTr.
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