Allegro UDN2943Z Datasheet
2943
A
HIGH-CURRENT HALF-BRIDGE MOTOR DRIVER
2943
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 motordrive applications.
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 activelow input, making the UDN2943Z especially desirable in many microprocessor applications. An accidental input open circuit will turn OFF
the corresponding output. The device also provides an internallygenerated dead time to prevent crossover currents during output
switching. Monolithic, space-saving construction offers reliability
unobtainable with discrete components.
Data Sheet
29318.4B
12345
S
+V
OUTPUT
GROUND
SINK INPUT
SOURCE INPUT
DISCONTINUED
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, Range VS.... 8.5 V to 35 V*
Output Voltage, V
Input Voltage Range, V
Continuous Output Current, I
Package Power Dissipation,
P
....................................... See Graph
D
Operating Temperature Range,
T
................................. -20°C to +85°C
A
Storage Temperature Range,
T
............................... -55°C to +150°C
S
*Internal high-voltage shutdown above 24 V.
.......................24 V
CE(sus)
.... -0.3 V to +18 V
IN
— FOR REFERENCE
PRODUCT
Dwg. PP-022-1
...... ±1.0 A
OUT
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.
ONLY
FEATURES
■ ±1 A Output Current ■ 8.5 V to 24 V Operating Range
■ Saturated Output Drivers ■ Crossover-Current Protected
■ Logic-Compatible Inputs ■ Withstands 35 V Supply Transients
■ Output-Transient Protection ■ Internal Over-Voltage Protection
■ Tri-State Output ■ Internal Short-Circuit Protection
Always order by complete part number: UDQ2943Z .
TM
TM
A
MicroSystems, Inc.
2943
A
HIGH-CURRENT HALF-BRIDGE MOTOR DRIVER
FUNCTIONAL BLOCK DIAGRAM
V
S
1
SOURCE
INPUT
SINK
INPUT
6.35 V
2
2.1 V
OVER-VOLT.
& TSD
5
2.1 V
L-TO-H DELAY
H-TO-L DELAY
HIGH-CURRENT
SENSE
GROUND
OUTPUT
4
3
Dwg. FP-038
20
R = 3.0°C/W
JT
θ
15
AAVID 5071B + 5072B HEAT SINKS,
R = 9.0°C/W
JA
θ
10
STAVER V1-5 HEAT SINK,
R = 13°C/W
JA
θ
5
FREE AIR, R = 65°C/W
0
25
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
JA
θ
50 75 100 125 150
TEMPERATURE IN °C
TM
TM
A
MicroSystems, Inc.
Dwg. GP-014A
LOGIC TRUTH TABLE
Source Driver Sink Driver Output
Pin 2 Pin 5 Pin 4
Low Low High
Low High High
High Low Low
High High High Z
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1986, 1994, Allegro MicroSystems, Inc.
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