Datasheet > UC3543M

UC3543M

更新时间： 2024-01-11 16:57:34

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德州仪器 - TI		/
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Power Supply Supervisory Circuit

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UC3543M 数据手册

UC1543, UC1544

UC2543, UC2544

UC3543, UC3544

www.ti.com

SLUS188A–APRIL 1997–REVISED FEBRUARY 2007

Power Supply Supervisory Circuit

Both over- and under-voltage sensing circuits can be

externally programmed for minimum time duration of

fault before triggering. All functions contain open

collector 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.

FEATURES

•

Includes Over-Voltage, Under-Voltage, and

Current Sensing Circuits

•

Internal 1% Accurate Reference

Programmable Time Delays

SCR “Crowbar” Drive of 300 mA

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 uncommitted inputs to the

voltage sensing comparators so that levels less than

2.5 V 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 highgain 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.

DESCRIPTION

The monolithic integrated circuits contain all the

functions necessary to monitor and control the output

sophisticated power supply system.

Over-voltage (O.V.) sensing with provision to trigger

an external SCR “crowbar” shutdown; an

undervoltage (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 device,

together with an independent, accurate reference

generator.

The reference generator circuit is internally trimmed

to eliminate the need for external 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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...20

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与UC3543M相关器件

型号	品牌	获取价格	描述	数据表
UC3543N	TI	获取价格	Power Supply Supervisory Circuit
UC3543NG4	TI	获取价格	Power Supply Supervisory Circuit
UC3543Q	ETC	获取价格	Voltage Detector
UC3543QTR	ETC	获取价格	Voltage Detector
UC3544	TI	获取价格	Power Supply Supervisory Circuit
UC3544DW	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO18
UC3544DWG4	TI	获取价格	1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO18, PLASTIC, SOIC-18
UC3544DWTR	ETC	获取价格	Voltage Detector
UC3544DWTRG4	TI	获取价格	IC,VOLT DETECTOR,ADJUSTABLE,BIPOLAR,SOP,18PIN,PLASTIC
UC3544J	TI	获取价格	Power Supply Supervisory Circuit

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