A4973SB-T Просмотр технического описания (PDF) - Allegro MicroSystems
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A4973SB-T Datasheet PDF : 11 Pages
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A4973
Full-Bridge PWM Motor Driver
Description (continued)
When a logic low is applied to the BRAKE input, the braking
function is enabled. This overrides ENABLE and PHASE to turn
off both source drivers and turn on both sink drivers. The brake
function can be used to dynamically brake brush DC motors.
The A4973 is supplied in a choice of two power packages; a
16-pin dual-in-line plastic package with copper heat-sink tabs,
and a 16-pin plastic SOIC with copper heat-sink tabs. For both
package styles, the power tab is at ground potential and needs no
electrical isolation. Each package type is available in a lead (Pb)
free version (100% matte tin plated leadframe).
Selection Guide
Part Number
A4973SB-T
A4973SLBTR-T
Package
16-pin DIP with exposed thermal tabs
16-pin SOICW with internally-fused pins
Packing
25 pieces per tube
1000 pieces per reel
Absolute Maximum Ratings
Characteristic
Load Supply Voltage
Logic Supply Voltage
Logic/Reference Input Voltage Range
Sense Voltage
Output Current, Continuous
Package Power Dissipation
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VBB
VCC
VIN
VSENSE
IOUT
PD
TA
TJ(max)
Tstg
Notes
Output current rating may be limited by duty cycle, ambient
temperature, and heat sinking. Under any set of conditions, do
not exceed the specified current rating or a junction tempera-
ture of 150°C.
Range S
www.DataSheet.co.kr
Fault conditions that produce excessive junction temperature
will activate the device’s thermal shutdown circuitry. These
conditions can be tolerated but should be avoided.
Rating
50
6
–0.3 to 6
0.5
±1.5
See graph
–20 to 85
150
–55 to 150
Units
V
V
V
V
A
W
ºC
ºC
ºC
Thermal Characteristics
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance, Junction
to Ambient
Package Thermal Resistance, Junction
to Tab
B Package, single-layer PCB, 1 in2. 2-oz. exposed copper
RθJA
LB Package, 2-layer PCB, 0.3 in2. 2-oz. exposed copper each
side
RθJT
*Additional thermal information available on Allegro website.
Value
43
67
6
Units
ºC/W
ºC/W
ºC/W
Note the A4973SB (DIP) and
the A4973SLB (SOIC) are
electrically identical and share
a common terminal number
assignment.
BRAKE 1
REF 2
RC 3
GROUND 4
GROUND 5
LOGIC
SUPPLY
6 VCC
PHASE 7
ENABLE 8
VBB
LOGIC
VBB
16
LOAD
SUPPLY
15 OUTB
14 MODE
13 GROUND
12 GROUND
11 SENSE
10 OUTA
LOAD
9 SUPPLY
Dwg. PP-056
4
R θJT = 6.0°C/W
3
SUFFIX 'B', RθJA = 43°C/W
2
1
SUFFIX 'LB', R θJA = 67°C/W
0
25
50
75
100
125
150
TEMPERATURE IN °C
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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