UC3903N

更新时间： 2024-01-04 12:44:21

品牌	Logo	应用领域
德州仪器 - TI		监视器
页数	文件大小	规格书
8页	479K
描述
Quad Supply and Line Monitor

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中文翻译

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数据手册
替代型号

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UC3903N 数据手册

UC1903

UC2903

UC3903

Quad Supply and Line Monitor

FEATURES

DESCRIPTION

•

Inputs for Monitoring up to Four

Separate Supply Voltage Levels

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.

Internal Inverter for Sensing a

Negative Supply Voltage

Line/Switch Sense Input for Early

Power Source Failure Warning

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.

Programmable Under- and

Over-Voltage Fault Thresholds

with Proportional Hysteresis

•

A Precision 2.5V Reference

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.

General Purpose Op-Amp for

Auxiliary Use

•

Three High Current, >30mA,

Open-Collector Outputs Indicate

Over-Voltage, Under-Voltage

and Power OK Conditions

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.

Input Supply Under-Voltage

Sensing and Start-Latch

Eliminate Erroneous Fault Alerts

During Start-Up

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.

8-40V Supply Operation with

7mA Stand-By Current

BLOCK DIAGRAM

Note: Pin numbers refer to J, N and DW packages.

4/97

12 3 4 5 6 7 8

中文翻译

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UC3903N 替代型号

型号	品牌	替代类型	描述	数据表
UC3903J	TI	完全替代	Quad Supply and Line Monitor
UC3903NG4	TI	类似代替	Quad Supply and Line Monitor
UC2903N	TI	类似代替	Quad Supply and Line Monitor

与UC3903N相关器件

型号	品牌	获取价格	描述	数据表
UC3903NG4	TI	获取价格	Quad Supply and Line Monitor
UC3903Q	TI	获取价格	Quad Supply and Line Monitor
UC3903QG3	TI	获取价格	Quad Supply and Line Monitor
UC3903QTR	ETC	获取价格	Voltage Detector
UC3904	TI	获取价格	Precision Quad Supply and Line Monitor
UC3904DW	TI	获取价格	Precision Quad Supply and Line Monitor
UC3904DWTR	TI	获取价格	Precision Quad Supply and Line Monitor
UC3904J	ETC	获取价格	Analog IC
UC3904N	TI	获取价格	Precision Quad Supply and Line Monitor
UC3904Q	ETC	获取价格	Power Supply Supervisor

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