UC3904

更新时间： 2024-10-02 12:47:15

品牌	Logo	应用领域
德州仪器 - TI		监视器
页数	文件大小	规格书
6页	310K
描述
Precision Quad Supply and Line Monitor

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UC3904 数据手册

UC1904

UC2904

UC3904

Precision Quad Supply and Line Monitor

FEATURES

DESCRIPTION

•

Inputs for Monitoring Up to Four

Supply Voltages

The UC1904 Quad Supply Monitor will respond to under- and over-volt-

age conditions on up to four continuously monitored voltage levels. Four

independent positive voltages can be monitored or, alternatively, two of

the sense inputs are preset to monitor -5V and -12V supplies. The de-

vice also monitors Over-Current and Line Sense inputs, both with preci-

sion input thresholds.

•

Two Inputs Preset for -5V and -12V

Monitoring, or Programmable

Positive Levels

•

Precision 2.5V Reference

Four open collector outputs on the UC1904 give the following re-

sponses: 1. The OV/OC output is a latched over-voltage, or over-current

response. 2. A Power Good signal responds low with any fault detection

– on power-up a programmable delay is used to hold this output low for

a system Power On Reset signal. 3. The PWRW output responds only to

a Line Sense input, for early warning of power failures. 4. The last open

collector, the ON/OFF output, generates a delayed supply OFF control

signal in response to an OFF input command, under-voltage condition,

or line fault detection.

Separate Inputs for Over-Current and

Line Fault Sensing

•

Adjustable Under- to Over-Voltage

Fault Windows

Latched Over-Voltage and

Over-Current Output

Power Good and Power Warning

Outputs

The OV-UV fault window is adjustable with a programming input. The

thresholds are centered around the precision 2.5V reference, with a

scaled hysteresis for precise, glitch free operation. In the positive mode

of operation, the fault windows at each of the sense inputs can be inde-

pendently scaled using external resistors and the 2.5V reference output.

An Auto Restart function couples with the under-voltage and line sens-

ing circuits to allow controlled power supply start-up and shutdown.

Auto Restart Function with ON/OFF

Control, and Programmable Delay

Programmable Pwr On Reset Delay

This device will operate over a supply range of 4.75V to 18V. The device

is available in a DIP, SOIC, or PLCC outline. This device is ESD pro-

tected on all pins.

BLOCK DIAGRAM

Note: Pin Numbers refer to J, N, and DW Packages.

4/97

12 3 4 5 6

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