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LM1946 Datasheet

  • LM1946

  • National Semiconductor [LM1946 Over/Under Current Limit Dia...

  • NSC

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LM1946 Over Under Current Limit Diagnostic Circuit
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
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Five independent comparators
Capable of 20 mA per output
Low power drain
User set input threshold voltages
Reverse battery protection
60V load dump protection on supply and all inputs
Input common mode range exceeds V
CC
Short circuit protection
Thermal overload protection
Prove-out test pin
Available in plastic DIP and SO packages
Applications
Y
Y
Y
Lamp fault detector
Motor stall detector
Power supply bus monitoring
Typical Application Circuit
Lamp Fault Detector
(I
L
l
1A)
TL H 8707 鈥?2
FIGURE 1
C
1995 National Semiconductor Corporation
TL H 8707
RRD-B30M115 Printed in U S A

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