TLH9133

August 1992

LM1951 Solid State 1 Amp Switch

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

built-in error detection provides an error flag output under

the following fault conditions output short to ground or sup-

ply open load current limit overvoltage or thermal shut-

down The LM1951 will drive all types of resistive or induc-

tive 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 com-

patible logic input with hysteresis Switching times both turn

quiescent current in the OFF state is typically less than

01 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

Features

Y

01 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

45V to 26V operation

Typical Application Circuit and Connection Diagram

TLH9133 – 1

Output

0

OFF

1ON

TO-220 5-Lead

TLH9133 – 2

Front View

Order Number LM1951T

See NS Package Number T05A

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A