UC3903 - 四路电源和线路监视器

UC3903是TI德州仪器公司的一款无产品，UC3903是四路电源和线路监视器，本站介绍了UC3903的封装应用图解、特点和优点、功能等，并给出了与UC3903相关的TI元器件型号供参考。

UC3903 - 四路电源和线路监视器 - 无 - 监控器和复位IC - 德州仪器

产品描述

The UC1903 family of quad supply and line monitor integrated circuits will respondto under- and over-voltage conditions on up to four continuously monitored voltage levels. An internal op-amp inverter allows at least one of these levels to be negative. A separate line/switcher sense input is available to provide early warning of line or other power source failures.

The fault window adjustment circuit on these devices provides easy programming of under- and over-voltage thresholds. The thresholds, centered around a precision 2.5-V reference, have an input hysteresis that scales with the window width for precise, glitch-free operation. A reference output pin allows the sense input fault windows to be scaled independently using simple resistive dividers.

The three open collector outputs on these devices sink in excess of 30 mA of load current when active. The under- and over-voltage outputs respond after separate, user defined, delays to respective fault conditions. The third output is active during any fault condition including under- and over-voltage, line/switcher faults, and input supply under-voltage. The off state of this output indicates a "power OK" situation.

An additional, uncommitted, general purpose op-amp is also included. This op-amp, capable of sourcing 20 mA of output current, can be used for a number of auxiliary functions including the sensing and amplification of a feedback error signal when the 2.5-V output is used as a system reference.

These parts operate over an 8-V to 40-V input supply range and require a typical stand-by current of only 7 mA.

产品特性

Inputs for Monitoring up to FourSeparate Supply Voltage Levels
Internal Inverter for Sensing a Negative Supply Voltage
Line/Switch Sense Input for Early Power Source Failure Warning
Programmable Under- and Over-Voltage Fault Thresholds with Proportional Hysteresis
A Precision 2.5-V Reference
General Purpose Op-Amp for Auxiliary Use
Three High Current, >3 0mA, Open-Collector Outputs Indicate Over-Voltage, Under-Voltage and Power OK Conditions
8-V to 40-V Supply Operation with 7-mA Stand-By Current

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