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UC1543, UC1543/883BC, UC1543B

Table of contents:
Info of UC1543
Info of UC1543/883BC
Info of UC1543B

UC1543, UC1543/883BC, UC1543B Selling Leads, Datasheet

Package Cooled:CDIP D/C:1000

UC1543, UC1543/883BC, UC1543B Datasheet download

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Part Number: UC1543

MFG: --

Package Cooled: CDIP

D/C: 1000

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UC1543 General Description

The monolithic integrated circuits contain all the functions necessary to monitor and control the output of a ophisticated 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 IC, together with an independent, accurate reference
generator.

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.

The UC1544/2544/3544 devices have the added versatility of completely uncommitted 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 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.

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.

UC1543 Maximum Ratings

Input Supply Voltage, V_IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..40V
Sense Inputs, Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V_IN
SCR Trigger Current (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. -600mA
Indicator Output Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Indicator Output Sink Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50mA
Power Dissipation (Package Limitation). . . . . . . . . . . . . . . . . . . . . . 1000mW
Operating Temperature Range
UC1543, UC1544 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
UC2543, UC2544 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25°C to +85°C
UC3543, UC3544 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . 0°C to +70°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . 65°C to +150°C

Note 1: At higher input voltages, a dissipation limiting resistor, RG, is required.
Note 2: Currents are positive-into, negative-out of the specified terminal. Consult Packaging section of Databook for thermal limitations and considerations of package.

UC1543 Features

` Includes Over-voltage, Under-voltage, And Current Sensing Circuits
` Internal 1% Accurate Reference
` Programmable Time Delays
` SCR "Crowbar" Drive Of 300mA
` Remote Activation Capability
` Optional Over-voltage Latch
` Uncommitted Comparator Inputs For Low Voltage Sensing (UC1544 Series Only)

UC1543 Connection Diagram

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