TL H 8706
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 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
is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
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
Logic Supply Voltage (V
SS
)
36V
Input Voltage (V
I
)
7V
Enable Voltage (V
E
)
7V
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 C to
a
125 C
Storage Temperature Range
b
65 C to
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
V
E
e
H
2
6
mAmax
Supply Current
V
I
e
H
I
O
e
0
V
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
V
E
e
H
44
60
mAmax
Supply Current
V
I
e
H
I
O
e
0
V
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
e b
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
Enable 1 activates outputs 1
2
TL H 8706 2
Enable 2 activates outputs 3
4
Input Output Truth Table
V
E
(
)
V
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
Simplified Schematic
TL H 8706 3
3
Typical Performance Characteristics
V
S
In all cases
e
24V
Input Voltage
Output Voltage vs
Enable Voltage
Output Voltage vs
Output Current
Saturation Voltage vs
vs Ambient Temperature
Source Saturation Voltage
vs Ambient Temperature
Sink Saturation Voltage
Logic Supply Voltage
Current vs
Quiescent Logic Supply
TL H 8706 4
Typical Applications
DC motor controls (with connections to
ground and to the supply voltages)
TL H 8706 5
Bidirectional DC motor control
TL H 8706 6
V
E
Pin
Pin
M1
M2
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
X
X
Free Running
Free Running
Motor Stop
Motor Stop
L
e
Low
H
e
High
X
e
Don't care
Inputs
Function
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
V
IN
2
Step
L
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
V
E
2
V
IN
1
V
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
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 35m 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 10
Motor Control Block Diagram
TL H 8706 7
TL H 8706 8
Maximum power dissipated
and junction to ambient
thermal resistance vs size
TL H 8706 9
5
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