NSC LM1951T Datasheet

LM1951 Solid State 1 Amp Switch

LM1951 Solid State 1 Amp Switch

August 1992

General Description

The LM1951 is a high current, high voltage, high side (PNP)
switch with a built-in error detection circuit.

The LM1951 is guaranteed to deliver 1 Amp output current
and is capable of withstanding up to
built-in error detection provides an error flag output under
the following fault conditions: output short to ground or sup­ply, open load, current limit, overvoltage or thermal shut­down. The LM1951 will drive all types of resistive or induc­tive loads. The output has a built-in negative voltage clamp

&

b

(

30V) to provide a quick energy discharge path for
inductive loads. The LM1951 features TTL and CMOS com­patible logic input with hysteresis. Switching times, both turn
on and turn off, are 2 ms(C
quiescent current in the OFF state is typically less than

load

0.1 mA at room temperature and less than 10 mA over the
entire operating temperature and voltage range.

The LM1951 features make it well suited for industrial and
automotive applications.

g

85V transients. The

k

0.005 mF). In addition, its

Features

Y

0.1 mA typical quiescent current (OFF state)

Y

1 Amp output current guaranteed

Y

g

85V transient protection

Y

Reverse voltage protection

Y

Negative output voltage clamp

Y

Error flag output

Y

Internal overvoltage shutdown

Y

Internal thermal shutdown

Y

Short circuit proof

Y

High speed switching (up to 50 kHz)

Y

Inductive or resistive loads

Y

Low ON resistance (1X maximum)

Y

TTL, CMOS compatible input with hysteresis

Y

Plastic TO-220 5-lead package

Y

ESD protected

Y

4.5V to 26V operation

Typical Application Circuit and Connection Diagram

VINOutput

0 OFF

1ON

TL/H/9133– 1

TO-220, 5-Lead

Front View

TL/H/9133– 2

Order Number LM1951T

See NS Package Number T05A

C

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

TL/H/9133

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage

Operational Voltage 26 V
Sustained Voltage
Transient Voltage Protection

e

(

u

100 ms, 1% Duty Cycle, R

b

Pins 4, 5 26 V

40 V

S

t

V

DC

CC

t

10X)

DC

s

85 V

DC

g

85V

DC

Power Dissipation (Note 1) Internally Limited

Load Inductance 1H

Operating Temperature Range (TA)

b

40§Ctoa125§C

Maximum Junction Temperature 150§C

Storage Temperature Range

b

65§Ctoa150§C

Lead Temperature (Soldering, 10 sec.) 260

ESD Tolerance (Note 4): 2000V

C

§

Electrical Characteristics

e

V

CC

Parameter Conditions Typical Limit Limit Units

Supply Voltage, V

Supply Current I

Voltage Drop I

b

(V

CC

Short Circuit Current V

Input Threshold, Pin 5 4.5VsV

Input Current, Pin 5 0.8VsV

Output Clamp I

Delay td,ON R
Time td, OFF

Rise Time 13 ms

Fall Time 13 ms

Error Flag Characteristics:
Output Voltage Error Condition, Pin 4 Low, Sinking 10 mA 0.3 0.8 V

Sink Current Error Condition, Pin 4e0.3V 10 3 mA

Output Leakage Current No Error, Pin 4e26V 0.01 1 mA

Response Time V

Note 1: Thermal resistance junction-to-case is 3§C/W. Thermal resistance case-to-ambient is 50§C/W.

Note 2: Tested Limits are guaranteed and 100% production tested.

Note 3: Design Limits are guaranteed (but not 100% production tested) over the operating temperature and supply voltage range. These limits are not used to

calculate outgoing quality levels.

Note 4: Human body model, 100 pF discharged through a 1.5 kX resistor.

12V, I

out

e

500 mA, C

out

e

0.001 mF, T

e

25§C unless otherwise specified

A

Tested Design

(Note 2) (Note 3)

CC

4.5 V

Operational 26 V

Transient ue100 ms, 1% Duty Cycle, R

CC

t

10X

b

85 V

85 V

V

OUT

e

0 mA, V

out

e

I

250 mA, V

out

e

I

600 mA, V

out

e

I

1A, V

out

)

out

I

out

OUT

e

600 mA, V

e

1A, V

e

ON/OFF

ON/OFF

0V, V

e

ON/OFF

ON/OFF

0.8V 0.1 10 100 mA

e

ON/OFF

ON/OFF

ON/OFF

2.0V 260 270 mA

e

2.0V 630 650 mA

e

2.0V 1.06 1.2 A

e

2.0V 400 600 mV

e

2.0V 0.7 1.0 V

e

2V

1.3

1.0 A

2.5 A

s

26V Turn ON 1.4 2.0 2.0 V

CC

Turn OFF 1.2 0.8 0.8 V

s

ON/OFF

5.5V
25

50 mA

10 mA

out

load

s

600 mA

e

20X,C

b

e

0.001 mF13ms

load

b

30

40 V

b

24 V

13 ms

LOGIC

e

5V, R

LOGIC

e

2kX,C

e

0 mF1 ms

LOGIC

min

max

max

max

max

max

max

max

min

max

max

min

max

min

min

max

max

max

max

max

max

min

max

2

Typical Performance Characteristics

Quiescent Current Quiescent Current Voltage Drop

Voltage Drop Short Circuit Current High Voltage Behavior

Threshold (Pin 5) ON/OFF Current (Pin 5) ON/OFF Current (Pin 5)

ON/OFF

Output Voltage
Resistive Load

Output Voltage
Inductive Load

TL/H/9133– 3

3