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UC1544L883B Datasheet(Fiches technique) 1 Page - Texas Instruments

Numéro de pièce UC1544L883B
Description  Power Supply Supervisory Circuit
Télécharger  19 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

UC1544L883B Datasheet(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
UC1543
,, UC1544
UC2543, UC2544
UC3543, UC3544
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
• Includes Over-Voltage, Under-Voltage, and
fault before triggering. All functions contain open
Current Sensing Circuits
collector outputs which can be used independently or
• Internal 1% Accurate Reference
wire-or’ed together, and although the SCR trigger is
directly connected only to the over-voltage sensing
• Programmable Time Delays
circuit, it may be optionally activated by any of the
• SCR “Crowbar” Drive of 300 mA
other outputs, or from an external signal. The O.V.
• Remote Activation Capability
circuit also includes an optional latch and external
reset capability.
• Optional Over-Voltage Latch
• Uncommitted Comparator Inputs for Low
The UC1544/2544/3544 devices have the added
Voltage Sensing (UC1544 Series Only)
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
The monolithic integrated circuits contain all the
used with external compensation as a linear amplifier
functions necessary to monitor and control the output
or as a highgain comparator. Although nominally set
of
a
sophisticated
power
supply
system.
for zero input offset, a fixed threshold may be added
Over-voltage (O.V.) sensing with provision to trigger
with an external resistor. Instead of current limiting,
an
external
SCR
“crowbar”
shutdown;
an
this circuit may also be used as an additional voltage
undervoltage (U.V.) circuit which can be used to
monitor.
monitor either the output or to sample the input line
The reference generator circuit is internally trimmed
voltage; and a third op amp/comparator usable for
to eliminate the need for external potentiometers and
current sensing (C.L.) are all included in this device,
the entire circuit may be powered directly from either
together with an independent, accurate reference
the output being monitored or from a separate bias
generator.
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.
Copyright © 1997–2007, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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