LM1946 Datasheet | National Semiconductor

Description The LM1946 provides the industrial or automotive system designer with over or under current limit detection superior to that of ordinary transistor or parator-based circuits Each of the five independent parators can be used to monitor a separate load as either an over current or under current limit detector Two parators 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 pensating 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 parators it turns on its output which can drive an external LED or microprocessor One side of the load can be grounded (not possible with ordinary parator designs) which is important for automotive systems Features Y Y Y Y Y Y Y Y Y Y Y Five independent parators Capable of 20 m A per output Low power drain User set input threshold voltages Reverse battery protection 60V load dump protection on supply and all inputs Input mon mode range exceeds VCC Short circuit protection Thermal overload protection Prove-out test pin Available in plastic DIP and SO packages Applications Lamp fault detector Motor stall detector Power supply bus monitoring Typical Application Circuit Lamp Fault Detector (IL l 1A) TL H 8707 - 2 FIGURE 1 C1995 National Semiconductor Corporation TL H 8707 RRD-B30M115 Printed in U S A Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage (VCC and Input Pins) Survival Voltage (T s 100 ms) Operational Voltage Internal Power Dissipation (Note 1) b 50V to a 60V Output Short Circuit to Ground or VCC Operating Temperature Range (TA) Maximum Junction Temperature Storage Temperature Range...