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PDF LM18293 Data sheet ( Hoja de datos )
| Número de pieza | LM18293 | |
| Descripción | Four Channel Push-Pull Driver | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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www.DataSheet4U.com
March 1998
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 en-
able controls 2 channels and when an enable pin is disabled
(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 volt-
age 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 package.
This provides much better heat sinking capability than most
other DIP packages available. The device is capable of oper-
ating at voltages up to 36 volts.
Features
n 1A output current capability per channel
n Pin for pin replacement for L293B
n Special 16 pin power DIP package
n 36 volt operation
n Internal thermal overload protection
n Logical “0” input voltage up to 1.5 volts results in high
noise immunity
Typical Connection
DataSheet4U.com
DataShee
DS008706-1
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.
© 1998 National Semiconductor Corporation DS008706
DataSheet4U.com
www.national.com
1 page  
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Typical Applications
et4U.com
DS008706-5
FIGURE 2. DC motor controls (with connections to
ground and to the supply voltages)
TABLE 2. DC Motor Controls
DS008706-6
FIGURE 3. Bidirectional DC motor control
VE Pin Pin
10 15
HH H
HH L
HL H
HL L
LX X
L = Low
H = High
X = Don’t care
M1
Fast Motor Stop
Fast Motor Stop
Run
Run
Free Running
Motor Stop
M2 TABLE 3. Bidirectional DC Motor Control
Inputs
Run Pin 10 = H
Fast Motor Stop
Pin 15 = L
Run
Fast Motor Stop
VE = H
Pin 10 = L
Pin 15 = H
Free Running
Pin 10 = Pin 15
Motor StopDataSheetV4EU=.cLom Pin 10 = X
Pin 15 = X
L = Low
H = High
X = Don’t care
Function
Turn CW
Turn CCW
Fast Motor Stop
Free Running
Motor Stop
Bipolar Stepping Motor Control (see Figure 4)
TABLE 4. Full Step Sequencing (Note 4)
TABLE 5. Half Step Sequencing
VIN 1
L
L
H
H
L
Note 4: VE 1 and VE 2 = H
VIN 2
L
H
H
L
L
Step
1
2
3
4
1
VE 1
H
VE 2
L
HH
LH
HH
HL
HH
LH
HH
HL
H = High
L = Low
X = Don’t care
VIN 1
L
L
X
H
H
H
X
L
L
VIN 2
X
L
L
L
X
H
H
H
X
Step
1
2
3
4
5
6
7
8
1
DataShee
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5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LM18293.PDF ] | |
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