Datasheet > UC3543DW

UC3543DW

更新时间： 2024-11-10 23:38:55

品牌	Logo	应用领域
其他 - ETC		光电二极管
页数	文件大小	规格书
6页	481K
描述
Voltage Detector

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中文翻译

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数据手册

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UC3543DW 数据手册

UC1543 UC1544

UC2543 UC2544

UC3543 UC3544

Power Supply Supervisory Circuit

FEATURES

DESCRIPTION

•

Includes Over-voltage,

The monolithic integrated circuits contain all the functions necessary to monitor

and control the output of a sophisticated power supply system. Over-voltage (O.V.)

sensing with provision to trigger an external SCR “crowbar” shutdown; an under-

voltage (U.V.) circuit which can be used to monitor either the output or to sample

the input line voltage; and a third op amp/comparator usable for current sensing

(C.L.) are all included in this IC, together with an independent, accurate reference

generator.

Under-voltage, And Current

Sensing Circuits

•

Internal 1% Accurate

Reference

•

Programmable Time Delays

SCR “Crowbar” Drive Of

300mA

Both over- and under-voltage sensing circuits can be externally programmed for

minimum time duration of fault before triggering. All functions contain open collec-

tor outputs which can be used independently or wire-or’ed together, and although

the SCR trigger is directly connected only to the over-voltage sensing circuit, it

may be optionally activated by any of the other outputs, or from an external signal.

The O.V. circuit also includes an optional latch and external reset capability.

•

Remote Activation Capability

Optional Over-voltage Latch

Uncommitted Comparator

Inputs For Low Voltage

Sensing (UC1544 Series

Only)

The UC1544/2544/3544 devices have the added versatility of completely uncom-

mitted inputs to the voltage sensing comparators so that levels less than 2.5V may

be monitored by dividing down the internal reference voltage. The current sense

circuit may be used with external compensation as a linear amplifier or as a high-

gain comparator. Although nominally set for zero input offset, a fixed threshold may

be added with an external resistor. Instead of current limiting, this circuit may also

be used as an additional voltage monitor.

The reference generator circuit is internally trimmed to eliminate the need for ex-

ternal potentiometers and the entire circuit may be powered directly from either the

output being monitored or from a separate bias voltage.

BLOCK DIAGRAM

Note: For each terminal, first number refers to 1543 series, second to 1544 series.

* On 1543 series, this function is internally connected to VREF.

4/97

12 3 4 5 6

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