As an interface between low-level logic and solenoids, dc (brush)
motors, or stepper motors, the UDN2998W dual full-bridge driver will
operate inductive loads up to 50 V with continuous output currents of
up to 2 A per bridge or peak (start-up) currents to 3 A. The control
inputs are compatible with TTL, DTL, and 5 V CMOS logic. Except
for a common supply voltage and thermal shutdown, the two drivers in
each package are completely independent.
For external PWM control, an Output Enable for each bridge
circuit is provided and the sink driver emitters are pinned out for
connection to external current-sensing resistors. The chopper drive
mode is characterized by low power dissipation levels and maximum
efficiency. A PHASE input to each bridge determines load-current
direction.
Extensive circuit protection is provided on-chip. Both ground-
clamp and flyback diodes for each bridge are provided. A thermal
shutdown circuit disables the load drive if chip temperature rating
(package power dissipation) is exceeded. Internally-generated delays
provide crossover-current protection.
The UDN2998W is packaged in a 12-pin single in-line power-tab
package for high power capabilities. Driving either of the bridges at
the full 2 A dc rating requires the use of an external heat sink. The tab
is at ground potential and needs no insulation.
FEATURES
I
±3 A Peak Output Current
I
Output Voltage to 50 V
I
Integral Output Suppression Diodes
I
Output Current Sensing
I
TTL /CMOS Compatible Inputs
I
Internal Thermal Shutdown Circuitry
I
Crossover-Current Protected
I
Automotive Capable
DUAL FULL-BRIDGE
MOTOR DRIVER
Always order by complete part number:
UDN2998W .
Dwg. No. W-106
Data Sheet
29319.6B
2998
ABSOLUTE MAXIMUM RATINGS
at T
J
+150
°
C
Supply Voltage, V
BB
.......................... 50 V
Output Current, I
OUT
(continuous) .....
±
2 A
(peak) ...........................................
±
3 A
Sink Driver Emitter Voltage, V
E
...... 1.5 V
Logic Input Voltage Range,
V
PHASE
or V
ENABLE
....... -0.3 V to 15 V
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
NOTE: Output current rating may be limited
by chopping frequency, ambient tempera-
ture, air flow, or heat sinking. Under any set
of conditions, do not exceed the specified
current rating or a junction temperature of
+150
°C.
2998
DUAL FULL-BRIDGE
MOTOR DRIVER
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
To maintain isolation between integrated circuit components and to
provide for normal transistor operation, the ground tab must be
connected to the most negative point in the external circuit.
FUNCTIONAL BLOCK DIAGRAM
(ONE OF TWO DRIVERS)
TRUTH TABLE
ENABLE
PHASE
INPUT
INPUT
OUTPUT 1
OUTPUT 2
Low
High
High
Low
Low
Low
Low
High
High
High
Open
Low
High
Low
Low
Open
BB
Dwg. No. W-107A
50
75
100
125
150
10
6
4
2
0
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
TEMPERATURE IN
°C
8
25
R = 2.0
°C/W
JT
Dwg. GP-012B
FREE AIR, R = 38
°C/W
JA
3.0
°C/W HEAT SINK
R = 5.0
°C/W
JA
12
°C/W HEAT SINK
R = 14
°C/W
JA
Copyright © 1985, 2000 Allegro MicroSystems, Inc.
2998
DUAL FULL-BRIDGE
MOTOR DRIVER
www.allegromicro.com
ELECTRICAL CHARACTERISTICS at T
A
= +25
°
C, T
J
+150
°
C, V
BB
= 50 V
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Output Drivers
Operating Voltage Range
V
BB
10
--50
V
Output Leakage Current
I
CEX
V
OUT
= 50 V, V
ENABLE
= 2.0 V, Note 2
--<5.0
50
µA
V
OUT
= 0, V
ENABLE
= 2.0 V, Note 2
--<-5.0
-50
µA
Output Saturation Voltage
V
CE(SAT)
I
OUT
= 1 A, Sink Driver
--1.2
1.4
V
I
OUT
= 2 A, Sink Driver
--1.7
1.9
V
I
OUT
= -1 A, Source Driver
--1.7
1.9
V
I
OUT
= -2 A, Source Driver
--2.0
2.2
V
Output Sustaining Voltage
V
CE(sus)
I
OUT
=
±2 A, L = 3.5 mH, Note 2
50
---- V
Source Driver Rise Time
t
r
I
OUT
= -2 A
--500
--
ns
Source Driver Fall Time
t
f
I
OUT
= -2 A
--750
--
ns
Deadtime
t
d
I
OUT
=
±2 A
--2.5
--
µs
Clamp Diode Leakage Current
I
R
V
R
= 50 V
--<5.0
50
µA
Clamp Diode Forward Voltage
V
F
I
F
= 2 A
--1.5
2.0
V
Supply Current
I
BB
V
ENABLE(1)
= V
ENABLE(2)
= 0.8 V
--30
35
mA
Control Logic (PHASE or ENABLE)
Logic lnput Voltage
V
IN(0)
---- 0.8
V
V
IN(1)
2.0
---- V
Logic Input Current
I
IN(0)
V
PHASE
or V
ENABLE
= 0.8 V
---5.0
-25
µA
I
IN(1)
V
PHASE
or V
ENABLE
= 2.0 V
--<1.0
10
µA
Turn-On Delay Time
t
pd0
ENABLE Input to Source Drivers
--0.4
1.0
µs
Turn-Off Delay Time
t
pd1
ENABLE Input to Source Drivers
--2.0
4.0
µs
NOTES: 1. Each driver is tested separately.
2. Test is performed with V
PHASE
= 0.8 V and then repeated for V
PHASE
= 2.0 V.
3. Negative current is defined as coming out of (sourcing) the specified device pin.
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