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UC1903N датащи(PDF) 1 Page - Texas Instruments |
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UC1903N датащи(HTML) 1 Page - Texas Instruments |
1 / 8 page UC1903 UC2903 UC3903 Quad Supply and Line Monitor FEATURES • Inputs for Monitoring up to Four Separate 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 2.5V Reference • General Purpose Op-Amp for Auxiliary Use • Three High Current, >30mA, Open-Collector Outputs Indicate Over-Voltage, Under-Voltage and Power OK Conditions • Input Supply Under-Voltage Sensing and Start-Latch Eliminate Erroneous Fault Alerts During Start-Up • 8-40V Supply Operation with 7mA Stand-By Current DESCRIPTION The UC1903 family of quad supply and line monitor integrated circuits will re- spond to under- and over-voltage conditions on up to four continuously moni- tored 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 pro- vide early warning of line or other power source failures. The fault window adjustment circuit on these devices provides easy program- ming of under- and over-voltage thresholds. The thresholds, centered around a precision 2.5V reference, have an input hysteresis that scales with the win- dow 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 will sink in excess of 30mA of load current when active. The under- and over-voltage outputs respond af- ter separate, user defined, delays to respective fault conditions. The third out- put is active during any fault condition including under- and over-voltage, line/switcher faults, and input supply under-voltage. The off state of this out- put indicates a "power OK" situation. An additional, uncommitted, general purpose op-amp is also included. This op-amp, capable of sourcing 20mA of output current, can be used for a num- ber of auxiliary functions including the sensing and amplification of a feed- back error signal when the 2.5V output is used as a system reference. In addition, these ICs are equipped with a start-latch to prevent erroneous un- der-voltage indications during start-up. These parts operate over an 8V to 40V input supply range and require a typical stand-by current of only 7mA. BLOCK DIAGRAM 4/97 Note: Pin numbers refer to J, N and DW packages. |
Аналогичный номер детали - UC1903N |
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Аналогичное описание - UC1903N |
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