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LM1946N Folha de dados(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças LM1946N
Descrição Electrónicos  LM1946 Over/Under Current Limit Diagnostic Circuit
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
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TLH8707
February 1993
LM1946 OverUnder 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 VCC
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 CircuitLamp Fault Detector (IL l 1A)
TLH8707 – 2
FIGURE 1
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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