2943
HIGH-CURRENT HALF-BRIDGE MOTOR DRIVER
2943
Data Sheet
29318.4B
HIGH-CURRENT
HALF-BRIDGE MOTOR DRIVER
Designed for use as a general-purpose motor driver, the
UDN2943Z half-bridge driver combines high-current sink and source
drivers with logic stages, level shifting, diode transient protection, and
a voltage regulator for single-supply operation. Capable of operating
in extremely harsh environments, this device can withstand high
ambient temperatures, output overloads, and repeated power supply
transient voltages without damage. The driver can be used in pairs for
full-bridge operation, or as triplets in three-phase brushless dc motor-
drive applications.
1
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, Range V
S
....
8.5 V to 35 V*
Output Voltage, V
CE(sus)
.......................
24 V
Input Voltage Range, V
IN
....
-0.3 V to +18 V
Continuous Output Current, I
OUT
......
±
1.0 A
Package Power Dissipation,
P
D
.......................................
See Graph
Operating Temperature Range,
T
A
.................................
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
...............................
-55
°
C to +150
°
C
*Internal high-voltage shutdown above 24 V.
U
E
N T
C
I
T C
N
N U RE
O D E
C O F
S R E
I P
Y
D
R NL
R O
O
F
—
2
3
4
5
The input circuitry is compatible with TTL, low-voltage CMOS,
and NMOS logic. Logic lockout prevents both source and sink drivers
from turning ON simultaneously. Each driver is turned ON by an active-
low input, making the UDN2943Z especially desirable in many micro-
processor applications. An accidental input open circuit will turn OFF
the corresponding output. The device also provides an internally-
generated dead time to prevent crossover currents during output
switching. Monolithic, space-saving construction offers reliability
unobtainable with discrete components.
Saturated output drivers provide for low saturation voltage at the
maximum rated current. Internal short-circuit protection, activated at
load currents above 1 A, protects the source driver from accidental
short-circuits between the output and ground.
The UDN2943Z driver is rated for continuous operation with
inductive loads at supply voltages of up to 24 V. With supply voltage
transients (to 35 V maximum), a high-voltage protection circuit
becomes operative, shutting OFF both output drivers. The internal
thermal shutdown is triggered by a nominal junction temperature
of 160°C.
Single-chip construction and a 5-lead power-tab TS-001 plastic
package provide cost-effective and reliable systems designs.
It also features excellent power dissipation ratings, minimum size, and
ease of installation. The heat-sink tab is at ground potential and does
not require insulation.
D
E
SOURCE INPUT
GROUND
Dwg. PP-022-1
SINK INPUT
OUTPUT
+V
S
FEATURES
s
s
s
s
s
±1
A Output Current
Saturated Output Drivers
Logic-Compatible Inputs
Output-Transient Protection
Tri-State Output
s
s
s
s
s
8.5 V to 24 V Operating Range
Crossover-Current Protected
Withstands 35 V Supply Transients
Internal Over-Voltage Protection
Internal Short-Circuit Protection
Always order by complete part number:
UDQ2943Z
.
A
TM
MicroSystems, Inc.
2943
HIGH-CURRENT HALF-BRIDGE MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
V
S
1
6.35 V
HIGH-CURRENT
SENSE
SOURCE
INPUT
2
2.1 V
OVER-VOLT.
& TSD
L-TO-H DELAY
4
H-TO-L DELAY
OUTPUT
SINK
INPUT
5
2.1 V
3
GROUND
Dwg. FP-038
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
20
R
θ
JT
= 3.0°C/W
15
AAVID 5071B + 5072B HEAT SINKS,
R
= 9.0°C/W
θ
JA
LOGIC TRUTH TABLE
Source Driver
Pin 2
Sink Driver
Pin 5
Low
High
Low
High
Output
Pin 4
High
High
Low
High Z
10
5
STAVER V1-5 HEAT SINK,
R
= 13°C/W
θ
JA
Low
Low
High
High
FREE AIR, R
θ
JA
= 65°C/W
0
25
50
75
100
TEMPERATURE IN
°C
125
150
Dwg. GP-014A
A
TM
MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts15036
115 Northeast Cutoff, Box 01615-0036 (508) 853-5000
Copyright ©Massachusetts 01615-0036 (508) 853-5000
Worcester, 1986, 1994, Allegro MicroSystems, Inc.
PCB Design
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