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LM1946M

更新时间： 2024-02-10 08:52:51

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
12页	218K
描述
LM1946 Over/Under Current Limit Diagnostic Circuit

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LM1946M 数据手册

February 1993

LM1946 Over/Under Current Limit Diagnostic Circuit

General Description

The LM1946 provides the industrial or automotive system

designer with over or under current limit detection superior

to that of ordinary transistor or comparator-based circuits.

Features

Five independent comparators

Capable of 20 mA per output

Low power drain

Each of the five independent comparators can be used to

monitor a separate load as either an over current or under

current limit detector. Two comparators monitoring a single

load can function as a current window monitor.

User set input threshold voltages

Reverse battery protection

60V load dump protection on supply and all inputs

Input common mode range exceeds V

Short circuit protection

Current is sensed by monitoring the voltage drop across the

wiring harness, pc board trace, or external sense resistor

that feeds the load.

Thermal overload protection

Prove-out test pin

Provisions for compensating the user set limits for wiring

harness resistance variations over temperature and supply

voltage variations are also available.

Available in plastic DIP and SO packages

Applications

When a limit is reached in one of the comparators, it turns

on its output which can drive an external LED or microproc-

essor.

Lamp fault detector

Motor stall detector

Power supply bus monitoring

One side of the load can be grounded (not possible with

ordinary comparator designs), which is important for auto-

motive systems.

Typical Application CircuitÐLamp Fault Detector (I 1A)

TL/H/8707–2

FIGURE 1

1995 National Semiconductor Corporation

TL/H/8707

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6 7...12

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