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參數(shù)資料
| 型號(hào)： | LM1946N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | LM1946 Over/Under Current Limit Diagnostic Circuit |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大小： | 216K |
| 代理商： | LM1946N |
TL/H/8707
L
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.
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.
Current is sensed by monitoring the voltage drop across the
wiring harness, pc board trace, or external sense resistor
that feeds the load.
Provisions for compensating the user set limits for wiring
harness resistance variations over temperature and supply
voltage variations are also available.
When a limit is reached in one of the comparators, it turns
on its output which can drive an external LED or microproc-
essor.
One side of the load can be grounded (not possible with
ordinary comparator designs), which is important for auto-
motive systems.
Features
Y
Five independent comparators
Y
Capable of 20 mA per output
Y
Low power drain
Y
User set input threshold voltages
Y
Reverse battery protection
Y
60V load dump protection on supply and all inputs
Y
Input common mode range exceeds V
CC
Y
Short circuit protection
Y
Thermal overload protection
Y
Prove-out test pin
Y
Available in plastic DIP and SO packages
Applications
Y
Lamp fault detector
Y
Motor stall detector
Y
Power supply bus monitoring
Typical Application CircuitDLamp Fault Detector
(I
L
l
1A)
TL/H/8707–2
FIGURE 1
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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