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SG1543 Datasheet

Power Supply Output Supervisory Circuit

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SG1543/SG2543/SG3543
Power Supply Output Supervisory Circuit
Description
This monolithic integrated circuit contains 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.
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-ORed 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 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 external potentiometers and the entire circuit may be powered directly
from either the output being monitored or from a separate bias voltage.
Block Diagram
Features
Over-Voltage, Under-Voltage, and
Current Sensing Circuits all included.
Reference Voltage Trimmed to 1%
Accuracy.
SCR "Crowbar" Drive of 300mA.
Programmable Time Delays.
Open-Collector Outputs and Remote
Activation Capability.
Total Standby Current less than 10mA.
High Reliability
Features
Available to MIL-STD-883, ¶ 1.2.1
MSC-AMS level “S” Processing
Available
Available to DSCC
– Standard Microcircuit Drawing (SMD)
February 2015 Rev. 1.2
www.microsemi.com
© 2015 Microsemi Corporation
1


  Microsemi Electronic Components Datasheet  

SG1543 Datasheet

Power Supply Output Supervisory Circuit

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Absolute Maximum Ratings (Note 1)
Input Supply Voltage (+VIN)................................................. 40V
Sense Inputs ...................................................................... +VIN
SCR Trigger Current (Note 2) ......................................... 300mA
Indicator Output Voltage ..................................................... 40V
Note 1. Values beyond which damage may occur.
Note 2. At higher input voltages, a dissipation limiting resistor, RG
is required. See Figure 1.
Indicator Output Sink Current .......................................... 50mA
Operating Junction Temperature
Hermetic (J, L Packages) ............................................ 150°C
Plastic (N, DW Packages) ........................................... 150°C
Storage Temperature Range ............................ -65°C to 150°C
RoHS Peak package Solder Reflow Temp. (40 sec. max. exp.)..... 260°C (+0. -5)
Thermal Data
J Package:
Thermal Resistance-Junction to Case, θJC ............. 30°C/W
Thermal Resistance-Junction to Ambient, θJA .... .... 80°C/W
N Package:
Thermal Resistance-Junction to Case, θJC ............. 40°C/W
Thermal Resistance-Junction to Ambient, θJA ........ 65°C/W
DW Package:
Thermal Resistance-Junction to Case, θJC ............. 40°C/W
Thermal Resistance-Junction to Ambient, θJA ......... 95°C/W
L Package:
Thermal Resistance-Junction to Case, .................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA ....... 120°C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA).
Note B. The above numbers for θJC are maximums for the
limiting thermal resistance of the package in a standard
mounting configuration. The θJA numbers are meant to
be guidelines for the thermal performance of the
device/pc-board system. All of the above assume no
ambient airflow.
Recommended Operating Conditions (Note 3)
Input Supply Voltage (+VIN) .................................... 4.7V to 40V
Current Limit Common Mode
Input Voltage Range ........................................... 0V to +VIN -3V
Reference Load Current ........................................... 0 to 10mA
Indicator Output Voltage ......................................... 4.7V to 40V
Indicator Output Current ........................................... 0 to 10mA
Delay Timing Capcitor (Note 4) ........................... 0 to 1µF
Operating Ambient Temperature Range
SG1543 ....................................................... -55°C to 125°C
SG2543 ........................................................ -25°C to 85°C
SG3543 ........................................................ 0°C to 70°C
Note 3: Range over which the device is functional.
Note 4. Larger value capacitor may be used with peak current limiting. See Figure 7.
Electrical Characteristics
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1543 with -55°C TA 125°C, SG2543 with
-25°C TA 85°C, SG3543 with 0°C TA 70°C, and +VIN = 10V. Indicator outputs have 2kpull-up resistor. Low duty cycle testing techniques
are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter
Supply Section
Input Voltage Range
Supply Current
Reference Section
Output Voltage
Line Regulation
Load Regulation
Short Circuit Current
Temperature Stability
Test Conditions
TJ = 25°C to TMAX
+VIN = 40V, Outputs open, TJ = 25°C
TJ = 25°C
+VIN = 5 to 30V
IREF = 0 to 10mA
VREF = 0V
SG1543/SG2543
Min. Typ. Max.
SG3543
Min. Typ. Max.
Units
4.5 40 4.5 40 V
4.7 40 4.7 40 V
7 10
7 10 mA
2.48 2.50 2.52 2.45 2.50 2.55 V
2.45 2.55 2.40 2.60 V
15
1 5 mV
1 10
1 10 mV
12 25 40 12 25 40 mA
.005 .005 %/°C
2


Part Number SG1543
Description Power Supply Output Supervisory Circuit
Maker Microsemi
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SG1543 Datasheet PDF






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