Datasheet LM18298T Datasheet (NSC)

LM18298 Dual Full-Bridge Driver

LM18298 Dual Full-Bridge Driver

April 1992

General Description

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.

Block & Connection Diagrams

Features

Y

Power supply voltage up to 46V

Y

2A output per channel

Y

Low saturation voltage

Y

Thermal shutdown protection

Y

Logical ‘‘0’’ input voltage up to 1.5V
(High noise immunity)

Y

Pin for pin replacement for L298N

Applications

Y

DC and stepper motor drivers

Y

Relay and solenoid drivers

TL/H/9302– 1

TL/H/9302– 2

TO 220-15

Order Number LM18298T

NS Package Number TA15A

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

TL/H/9302

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) 50V

Logic Supply (Pin 9) 7V

Logic Inputs

(Pins 5, 6, 7, 10, 11, 12)

Peak Output Current (Per Channel)

Non-Repetitive (t
Repetitive (80% duty cycle, t
DC Operation 2A

Electrical Characteristics

e

V

42V, V

S

e

100 ms) 3A

e

5V, I

SS

O

e

10 ms) 2.5A

ON

e

0A, T

e

J

b

0.3 to 7V

25§C, Le0V, He5V, unless otherwise specified

Symbol Parameter Conditions

V

S

V

SS

I

S

Main Supply Voltage (Pin 4) V

Logic Supply Voltage (Pin 9) 4.5 V (min)

Main Supply Quiescent Current EnableeH, InputeL9 22
(Pin 4)

EnableeH, InputeH 32 70 mA (max)

EnableeL, InputeX4

I

SS

Logic Supply Quiescent Current EnableeH, InputeL22 36
(Pin 9)

EnableeH, InputeH 6 12 mA (max)

EnableeL, InputeX6

V

IL

V

IH

I

IL

I

IH

V

EN L

V

EN H

I

EN L

I

EN H

Low Level Input Voltage
(Pins 5, 7, 10, 12)

High Level Input Voltage 2.3 V (min)
(Pins 5, 7, 10, 12)

Low Level Input Current InputeL
(Pins 5, 7, 10, 12)

High Level Input Current InputeH 30 100
(Pins 5, 7, 10, 12)

Low Level Enable Voltage
(Pins 6, 11)

High Level Enable Voltage 2.3 V (min)
(Pins 6, 11)

Low Level Enable Input Current EnableeL
(Pins 6, 11)

High Level Enable Input Current EnableeH
(Pins 6, 11)

Sense Voltage (Pins 1, 15)

Power Dissipation (Note 2) 25W

ESD Susceptibility (Note 3) 1 kV

Lead Temperature (Soldering, 10 seconds) 260§C

Storage Temperature Range

Operating Ratings

Junction Temperature Range (TJ)

Main Supply (Pin 4) 46V

b

1toa2.3V

b

65§Ctoa150§C

b

40§Ctoa150§C

Typical Limit Units

(Note 4) (Note 5) (Limits)

a

2.5 V (min)

SS

46 V (max)

7 V (max)

b

0.3 V (min)

1.5 V (max)

V

SS

b

10 mA (max)

V (max)

mA (max)

b

0.3 V (min)

1.5 V (max)

V

SS

b

10 mA (max)

V (max)

30 100 mA (max)

2

Electrical Characteristics (Continued)

e

V

S

Symbol Parameter Conditions

V

CE sat (H)

V

CE sat (L)

V

CE sat

V

sense

42V, V

e

SS

5V, I

e

O

0A, T

e

25§C, unless otherwise specified

J

Source Saturation Voltage I
(Pins 2, 3, 13, 14)

Sink Saturation Voltage I
(Pins 2, 3, 13, 14)

Total Drop I

CE sat (H)

a

V

CE sat (L)

V

Sensing Voltage (Pins 1, 15) ts50 ms

Typical Limit Units

(Note 4) (Note 5) (Limits)

e

1A 1.35 1.7

O

e

I

2A 2.0 2.7

O

e

1A 1.2 1.6

O

e

I

2A 1.7 2.3

O

e

1A 3.2

O

e

I

2A 4.9

O

Continuous

V (max)

V (max)

V (max)

b

1

b

0.5

V (min)

Continuous 2 V (max)

T

1

T

2

T

3

T

4

T

5

T

6

T

7

T

8

f

C

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 T
dissipation at any temperature is P
case thermal resistance (i

Note 3: Human body model, 100 pF discharged through a 1.5 kX resistor.

Note 4: Typicals are at 25

Note 5: Limits are guaranteed and 100% tested.

Source Current Turn-Off Delay 0.5 Input to 0.9 IO(

Source Current Fall Time 0.9 IOto 0.1 IO(

Figure 2

Source Current Turn-On Delay 0.5 Input to 0.1 IO(

Source Current Rise Time 0.1 IOto 0.9 IO(

Figure 2

Sink Current Turn-Off Delay 0.5 Input to 0.9 IO(

Sink Current Fall Time 0.9 IOto 0.1 IO(

Figure 3

Sink Current Turn-On Delay 0.5 Input to 0.1 IO(

Sink Current Rise Time 0.1 IOto 0.9 IO(

Commutation Frequency I

e

b

(T

D max

) of the LM18298 is 3§C/W.

JC

C and represent the most likely parametric norm.

§

TC)/iJCor the number given in the Absolute Maximum Ratings, whichever is lower. The typical junction-to-

J max

e

2A 25 kHz

O

Figure 3

Figure 2

) 0.5 ms

) 0.15 ms

Figure 2

) 1.3 ms

) 0.85 ms

Figure 3

) 0.25 ms

) 0.1 ms

Figure 3

) 1.3 ms

) 0.1 ms

, iJC, and TC. The maximum allowable power

J max

3

Typical Performance Characteristics

Output Voltage
(See

Figure 1

)

Source Current
Switching Times

Output Voltage
(See

Figure 1

)

Source Current
Switching Times

Maximum Power Dissipation

TL/H/9302– 3

Main Supply Quiescent
Current (IS, Pin 4)

Sink Current
Switching Times

Sink Current
Switching Times

4

TL/H/9302– 12

Logic Supply Quiescent
Current (ISS, Pin 9)

TL/H/9302– 13

Test Circuits

TL/H/9302– 5

FIGURE 2(a). Source Current

Switching Time Test Circuit

FIGURE 1. Input/Enable Threshold Test Circuit

TL/H/9302– 4

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

FIGURE 3(b). Sink Current Switching Time Definitions

TL/H/9302– 8

5

Applications Information

TL/H/9302– 9

Enable B Inputs Motor Direction

Input 3eH, Input 4eL Clockwise

H Input 3eL, Input 4eH Counterclockwise

Input 3eInput 4 Dynamic Braking

L Input 3eX, Input 4eInput 3 Coast to a Stop

LeLow HeHigh Xedon’t care

FIGURE 4. Bidirectional DC Motor Control

TL/H/9302– 10

Enable B Input 3 Motor 1 Input 4 Motor 2

H H Dynamic Braking H Run

H L Run L Dynamic Braking

L X Coast to a Stop X Coast to a Stop

LeLow HeHigh XeDon’t Care

FIGURE 5. 2-Motor Controller

(Using both High- and Low-Side Driver Modes)

FIGURE 6. Two-Phase Bipolar Stepper Motor Control Circuit

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

TL/H/9302– 11

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).

6

7

Physical Dimensions inches (millimeters)

LM18298 Dual Full-Bridge Driver

Order Number LM18298T

See NS Package Number TA15A

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