NSC LM18298T

LM18298 Dual Full-Bridge Driver
General Description
Features
The LM18298 is a high voltage, high current dual full-bridge
driver designed to accept standard TTL logic levels and
drive inductive loads such as relays, solenoids, DC and
stepping motors. Two enable inputs are provided to gate the
input control signals.
The emitters of the lower transistors of each bridge are connected together and the corresponding external terminal
can be used for the connection of a current sensing resistor.
An additional supply input is provided to accommodate conventional logic supply voltages.
Y
Y
Y
Y
Y
Y
Power supply voltage up to 46V
2A output per channel
Low saturation voltage
Thermal shutdown protection
Logical ‘‘0’’ input voltage up to 1.5V
(High noise immunity)
Pin for pin replacement for L298N
Applications
Y
Y
DC and stepper motor drivers
Relay and solenoid drivers
Block & Connection Diagrams
TL/H/9302 – 1
TL/H/9302 – 2
TO 220-15
Order Number LM18298T
NS Package Number TA15A
C1995 National Semiconductor Corporation
TL/H/9302
RRD-B30M115/Printed in U. S. A.
LM18298 Dual Full-Bridge Driver
April 1992
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Main Supply (Pin 4)
Logic Supply (Pin 9)
Logic Inputs
(Pins 5, 6, 7, 10, 11, 12)
b 1 to a 2.3V
25W
ESD Susceptibility (Note 3)
1 kV
Lead Temperature (Soldering, 10 seconds)
260§ C
b 65§ C to a 150§ C
Storage Temperature Range
50V
7V
b 0.3 to 7V
Peak Output Current (Per Channel)
Non-Repetitive (t e 100 ms)
Repetitive (80% duty cycle, tON e 10 ms)
DC Operation
Sense Voltage (Pins 1, 15)
Power Dissipation (Note 2)
Operating Ratings
Junction Temperature Range (TJ)
Main Supply (Pin 4)
3A
2.5A
2A
b 40§ C to a 150§ C
46V
Electrical Characteristics
VS e 42V, VSS e 5V, IO e 0A, TJ e 25§ C, L e 0V, H e 5V, unless otherwise specified
Symbol
VS
VSS
IS
Parameter
Conditions
Typical
(Note 4)
Main Supply Voltage (Pin 4)
Logic Supply Voltage (Pin 9)
Main Supply Quiescent Current
(Pin 4)
Logic Supply Quiescent Current
(Pin 9)
VIH
V (max)
4.5
V (min)
7
V (max)
9
22
32
70
Enable e H, Input e L
22
36
Enable e H, Input e H
6
12
Input e L
IIH
High Level Input Current
(Pins 5, 7, 10, 12)
Input e H
VEN L
Low Level Enable Voltage
(Pins 6, 11)
30
High Level Enable Voltage
(Pins 6, 11)
IEN L
Low Level Enable Input Current
(Pins 6, 11)
Enable e L
IEN H
High Level Enable Input Current
(Pins 6, 11)
Enable e H
2
mA (max)
6
High Level Input Voltage
(Pins 5, 7, 10, 12)
Low Level Input Current
(Pins 5, 7, 10, 12)
mA (max)
4
Low Level Input Voltage
(Pins 5, 7, 10, 12)
IIL
VEN H
V (min)
46
Enable e H, Input e L
Enable e L, Input e X
VIL
Units
(Limits)
VSS a 2.5
Enable e H, Input e H
Enable e L, Input e X
ISS
Limit
(Note 5)
30
b 0.3
V (min)
1.5
V (max)
2.3
V (min)
VSS
V (max)
b 10
mA (max)
100
mA (max)
b 0.3
V (min)
1.5
V (max)
2.3
V (min)
VSS
V (max)
b 10
mA (max)
100
mA (max)
Electrical Characteristics (Continued)
VS e 42V, VSS e 5V, IO e 0A, TJ e 25§ C, unless otherwise specified
Symbol
VCE sat (H)
VCE sat (L)
VCE sat
Vsense
Parameter
Source Saturation Voltage
(Pins 2, 3, 13, 14)
Sink Saturation Voltage
(Pins 2, 3, 13, 14)
Total Drop
VCE sat (H) a VCE sat (L)
Sensing Voltage (Pins 1, 15)
Conditions
Typical
(Note 4)
Limit
(Note 5)
IO e 1A
1.35
1.7
IO e 2A
2.0
2.7
IO e 1A
1.2
1.6
IO e 2A
1.7
2.3
IO e 1A
3.2
IO e 2A
4.9
t s 50 ms
b1
Continuous
Units
(Limits)
V (max)
V (max)
V (max)
V (min)
b 0.5
Continuous
2
V (max)
T1
Source Current Turn-Off Delay
0.5 Input to 0.9 IO (Figure 2 )
0.5
T2
Source Current Fall Time
0.9 IO to 0.1 IO (Figure 2 )
0.15
ms
T3
Source Current Turn-On Delay
0.5 Input to 0.1 IO (Figure 2 )
1.3
ms
T4
Source Current Rise Time
0.1 IO to 0.9 IO (Figure 2 )
0.85
ms
T5
Sink Current Turn-Off Delay
0.5 Input to 0.9 IO (Figure 3 )
0.25
ms
T6
Sink Current Fall Time
0.9 IO to 0.1 IO (Figure 3 )
0.1
ms
T7
Sink Current Turn-On Delay
0.5 Input to 0.1 IO (Figure 3 )
1.3
ms
T8
Sink Current Rise Time
0.1 IO to 0.9 IO (Figure 3 )
0.1
ms
fC
Commutation Frequency
IO e 2A
25
kHz
ms
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when
operating the device beyond its specified Operating Ratings.
Note 2: The maximum power dissipation must be derated at elevated temperatures and is a function of TJ max, iJC, and TC. The maximum allowable power
dissipation at any temperature is PD max e (TJ max b TC)/iJC or the number given in the Absolute Maximum Ratings, whichever is lower. The typical junction-tocase thermal resistance (iJC) of the LM18298 is 3§ C/W.
Note 3: Human body model, 100 pF discharged through a 1.5 kX resistor.
Note 4: Typicals are at 25§ C and represent the most likely parametric norm.
Note 5: Limits are guaranteed and 100% tested.
3
Typical Performance Characteristics
Output Voltage
(See Figure 1 )
Output Voltage
(See Figure 1 )
Maximum Power Dissipation
TL/H/9302 – 3
Source Current
Switching Times
Source Current
Switching Times
Main Supply Quiescent
Current (IS, Pin 4)
TL/H/9302 – 12
Sink Current
Switching Times
Sink Current
Switching Times
Logic Supply Quiescent
Current (ISS, Pin 9)
TL/H/9302 – 13
4
Test Circuits
TL/H/9302 – 4
FIGURE 1. Input/Enable Threshold Test Circuit
TL/H/9302–5
FIGURE 2(a). Source Current
Switching Time Test Circuit
TL/H/9302 – 6
FIGURE 2(b). Source Current
Switching Time Definitions
TL/H/9302–7
FIGURE 3(a). Sink Current
Switching Time Test Circuit
TL/H/9302 – 8
FIGURE 3(b). Sink Current Switching Time Definitions
5
Applications Information
TL/H/9302 – 10
TL/H/9302–9
Enable B
Inputs
Input 3 e H, Input 4 e L
Motor 1
Input 4
Clockwise
H
H
Dynamic Braking
H
Run
H
Input 3 e L, Input 4 e H
Counterclockwise
H
L
Run
L
Dynamic Braking
Input 3 e Input 4
Dynamic Braking
Input 3 e X, Input 4 e Input 3 Coast to a Stop
L
X
X
Coast to a Stop
L
L e Low
H e High
Motor Direction
Enable B Input 3
Coast to a Stop
L e Low
H e High
Motor 2
X e Don’t Care
FIGURE 5. 2-Motor Controller
(Using both High- and Low-Side Driver Modes)
X e don’t care
FIGURE 4. Bidirectional DC Motor Control
TL/H/9302 – 11
FIGURE 6. Two-Phase Bipolar Stepper Motor Control Circuit
of 1.2V or less at the rated load current. Typical devices are
the MB346 (Microsemi Corp., Santa Ana, CA), and the
V331X (Varo Semiconductor Inc., Garland, TX).
CLAMP DIODES
When driving inductive loads, diodes are necessary to
clamp spikes at the LM18298 outputs. Clamp diodes must
have a recovery time of 200 ns or better and a forward drop
6
7
LM18298 Dual Full-Bridge Driver
Physical Dimensions inches (millimeters)
Order Number LM18298T
See NS Package Number TA15A
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