UNITRODE UC1543, UC1544, UC2543, UC2544, UC3543 Technical data
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Power Supply Supervisory Circuit
DESCRIPTIONFEATURES
•
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)
The monolithic integrated circuits contain all the functions necessar y to monitor
and control the output of a sophisticated power supply sy stem. Over-voltage (O.V.)
sensing with provision to t rigger an exter nal SCR “crowbar” shutdown; an undervoltage (U.V.) circuit which can be us ed 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 inclu ded in this IC, together with an independent, accurate reference
generator.
Both over- and under- voltage sensing circuits can be externally programmed for
minimum time dura tion of fault before tri ggeri ng. All functions contain open collector outputs wh ich 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 optionall y ac t ivate d by any of the other outputs, or fr om an external signal.
The O.V. circuit also includes an optional latch and external reset capability.
The UC1544/254 4/3544 devices have the ad ded versatility of completely uncommitted inputs to the voltage sensing c omparators so that levels less than 2.5V may
be monitored by dividing down the internal reference voltage. The current sense
circuit may be us ed wi th exter nal c ompen sation as a linear amplifier or as a highgain comparator. Although nominally s et 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.
UC1543 UC1544
UC2543 UC2544
UC3543 UC3544
BLOCK DIAGRAM
The reference generat or circuit is internall y trimmed to el iminate 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.
Note: For each terminal, firs t n um be r refers to 1543 series, se co nd to 15 44 series.
* On 1543 series, this function is internally connected to V
4/97
REF.
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage, VIN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Sense Inputs, Voltage Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to V
SCR Trigger Current (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -600mA
Indicator Output Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Indicator Output Sink Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Power Dissipation (Package Limitation). . . . . . . . . . . . . . . . . . . . . . . 1000mW
Operating Temp era ture 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
IN
Note 1: At higher input voltages, a diss ipation limiti ng 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.
CONNECTION DIAGRAMS
UC1543 UC1544
UC2543 UC2544
UC3543 UC3544
DIL-16, SOIC-16 (TOP VIEW)
J or N, DW Package
PLCC-20, LCC-20
PACKAGE PIN FUNCTION
(TOP VIEW)
Q or L Package
N/C 1
SCR Trigger 2
Remote Activate 3
Reset 4
O.V. Indicate 5
N/C 6
O.V. Delay 7
O.V. Input 8
N/C 9
N/C 10
U.V. Input 1 1
U.V. Delay 12
U.V. Indicate 13
C.L. INV. Input 14
C.L. N.I. Input 15
Offset/Comp 16
C.L. Output 17
Ground 18
V
V
FUNCTION PIN
REF
IN
UC 1543
UC 2543
UC 3543
19
20
DIL-18, SOIC-18 (T OP VIEW)
J or N, DW Package
PLCC-20, LCC-20
PACKAGE PIN FUNCTION
(TOP VIEW)
Q or L Package
N/C 1
SCR Trigger 2
Remote Activate 3
Reset 4
O.V. Indicate 5
N/C 6
O.V. Delay 7
O.V. N.I. Input 8
O.V. INV. Input 9
U.V. N.I. Input 10
U.V. INV. Input 11
U.V. Delay 12
U.V. Indicate 13
C.L. INV. Input 14
C.L. N.I. Input 15
Offset/Comp 16
C.L. Output 17
Ground 18
V
V
FUNCTION PIN
REF
IN
UC 1544
UC 2544
UC 3544
19
20
2
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