LM18293.PDF
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LM18293 Four Channel Push-Pull Driver
March 1995
LM18293 Four Channel Push-Pull Driver
General Description
The LM18293 is designed to drive DC loads up to one amp.
Typical applications include driving such inductive loads as
solenoids, relays and stepper motors along with driving
switching power transistors and use as a buffer for low level
logic signals. The four inputs accept standard TTL and DTL
levels for ease of interfacing. Two enable pins are provided
that also accept the standard TTL and DTL levels. Each
enable controls 2 channels and when an enable pin is dis-
abled (tied low), the corresponding outputs are forced to the
TRI-STATE
É
condition. If the enable pins are not connected
(i.e., floating), the circuit will function as if it has been en-
abled. Separate pins are provided for the main power supply
(pin 8), and the logic supply (pin 16). This allows a lower
voltage to be used to bias up the logic resulting in reduced
power dissipation. The chip is packaged in a specially de-
signed 16 pin power DIP. The 4 center pins of this package
are tied together and form the die paddle inside the pack-
age. This provides much better heat sinking capability than
most other DIP packages available. The device is capable
of operating at voltages up to 36 volts.
Features
Y
1A output current capability per channel
Y
Pin for pin replacement for L293B
Y
Special 16 pin power DIP package
Y
36 volt operation
Y
Internal thermal overload protection
Y
Logical ``0'' input voltage up to 1.5 volts results in high
noise immunity
Typical Connection
TL/H/8706±1
FIGURE 1. Application circuit showing bidirectional and on/off control of a single DC motor
using two outputs and unidirectional on/off function of two DC motors using a single output each.
Order Number LM18293N
NS Package Number N16A
TRI-STATE
É
is a registered trademark of National Semiconductor Corp.
C
1995 National Semiconductor Corporation
TL/H/8706
RRD-B30M115/Printed in U. S. A.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Output Drive Supply Voltage (V
S
)
36V
Peak Output Current (Non-Repetitive t
e
5 ms) 2A
Junction Temperature (T
J
)
a
150
§
C
Thermal Resistance Junction to Case (
i
JC
) 14
§
C/W
Thermal Resistance Junction to Ambient (
i
JA
) 80
§
C/W
Internal Power Dissipation Internally Limited
Operating Temperature Range
b
40
§
Cto
a
125
§
C
Storage Temperature Range
Logic Supply Voltage (V
SS
)
36V
Input Voltage (V
I
)
7V
Enable Voltage (V
E
)
7V
b
65
§
Cto
a
150
§
C
Lead Temperature (Solder 10 seconds)
260
§
C
Electrical Characteristics
V
S
e
24V, V
SS
e
5V, T
e
25
§
C, L
e
0.4V, H
e
3.5V, each channel, unless otherwise noted
Symbol
Parameter
Conditions
Typical
Tested Limit Design Limit
Units
(Note 1)
(Note 2)
V
S
Main Supply (Pin 8) Maximum Supply Voltage
36
Vmax
V
SS
Logic Supply (Pin 16) Minimum Logic Supply Voltage
4.5
Vmin
Maximum Logic Supply Voltage
36
Vmax
I
S
Total Quiescent
V
I
e
L I
O
e
0
E
e
H 2
6
mAmax
Supply Current
V
I
e
HI
O
e
0
E
e
H 16
24
mAmax
V
E
e
L
4
mAmax
I
SS
Total Quiescent Logic V
I
e
L I
O
e
0
E
e
H 44
60
mAmax
Supply Current
V
I
e
HI
O
e
0
E
e
H 16
22
mAmax
(pin 16)
V
E
e
L 16
24
mAmax
V
I
Input Voltage
Min Value of Low
b
0.3
Vmin
Max Value of Low
1.5
Vmax
Min Value of High
2.3
Vmin
Max Value of High (V
SS
s
7)
V
SS
Vmax
Max Value of High (V
SS
l
7)
7
Vmax
I
I
Input Current
V
I
e
L
b
10
m
Amax
V
I
e
H
30
100
m
Amax
V
E
Enable Voltage
Min Value of Low
b
0.3
Vmin
(Pins 1, 9)
Max Value of Low
1.5
Vmax
Min Value of High
2.3
Vmin
Max Value of High (V
SS
s
7)
V
SS
Vmax
Max Value of High (V
SS
l
7)
7
Vmax
I
E
Enable Current
V
E
e
L
b
30
b
100
m
Amax
V
E
e
H
g
10
m
Amax
V
CE
sat Top Source Saturation
I
o
eb
1 amp
1.4
1.8
Vmax
Voltage
V
CE
sat Bottom Sink Saturation
I
o
e
1 amp
1.2
1.8
Vmax
Voltage
t
r
Rise Time
10%±90% V
o
250
ns
t
f
Fall Time
90%±10% V
o
250
ns
t
on
Turn-On Delay
50% V
I
to 50% V
o
450
ns
t
off
Turn-Off Delay
50% V
I
to 50% V
o
200
ns
Note 1: Tested limits are guaranteed and 100% production tested.
Note 2: Design limits are guaranteed (but not 100% production tested) over the full supply and temperature range. These limits are not used to calculate outgoing
quality levels.
2
Connection Diagram
Input/Output Truth Table
V
E
(**)
I
(Each Channel) V
O
H
H
H
H
L
L
L
H
X (*)
L
L
X (*)
(*) High output impedance.
(**) Relative to the pertinent channel.
Enable 1 activates outputs1&2
TL/H/8706±2
Enable 2 activates outputs3&4
Simplified Schematic
TL/H/8706±3
3
Typical Performance Characteristics
V
S
In all cases
e
24V
Output Voltage vs.
Output Voltage vs.
Saturation Voltage vs.
Input Voltage
Enable Voltage
Output Current
Quiescent Logic Supply
Source Saturation Voltage
Sink Saturation Voltage
Current vs.
vs. Ambient Temperature
vs. Ambient Temperature
Logic Supply Voltage
TL/H/8706±4
Typical Applications
DC motor controls (with connections to
ground and to the supply voltages)
Bidirectional DC motor control
TL/H/8706±5
TL/H/8706±6
V
E
Pin Pin
M1
M2
Inputs
Function
10 15
H H H Fast Motor Stop Run
H H L Fast Motor Stop Fast Motor Stop
H L H Run Run
H L L Run Fast Motor Stop
L XX
Free Running Free Running
Motor Stop Motor Stop
L
e
Low H
e
High X
e
Don't care
Pin 10
e
H
Turn CW
Pin 15
e
L
V
E
e
H
Pin 10
e
L
Turn CCW
Pin 15
e
H
Pin 10
e
Pin 15
Fast Motor Stop
V
E
e
L
Pin 10
e
X
Free Running
Pin 15
e
X
Motor Stop
L
e
Low H
e
High X
e
Don't care
4
Bipolar Stepping Motor Control
Step Sequencing Tables
Full Step *
V
IN
1
IN
2 Step
L
Motor Control Block Diagram
L
1
L
H
2
H
H
3
H
L
4
L
L
1
*V
E
1 and V
E
2
e
H
Half Step
V
E
1
E
2
IN
1
IN
2 Step
H L L X 1
H H L L 2
L H X L 3
H H H L 4
H L H X 5
H H H H 6
L H X
H 7
H H L
H 8
H L
L
X
1
H
e
High L
e
Low X
e
Don't care
TL/H/8706±7
Mounting Instructions
The junction to ambient thermal resistance of the LM18293
can be reduced by soldering the ground pins to a suitable
copper area of the printed circuit board or to an external
heatsink. The graph below, which shows the maximum pow-
er dissipated and junction to ambient thermal resistance as
a function of the side ``l'' of two equal square copper areas
having a thickness of 35
m
, illustrates this. In addition, it is
possible to use an external heatsink (see illustration below).
During soldering the pins temperature must not exceed
230
§
C and the soldering time must not be longer than 12
seconds. The external heatsink or printed circuit copper
area must be connected to electrical ground.
Staver External Heat-sink
TL/H/8706±8
Maximum power dissipated
and junction to ambient
thermal resistance vs. size
TL/H/8706±9
TL/H/8706±10
5
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