SG3543DW 반도체 회로 부품 판매점
POWER SUPPLY OUTPUT SUPERVISORY CIRCUIT
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 Microsemi Corporation |
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 mini-
mum 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.
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
- SG1543
♦ Available to MIL-STD-883 and
DESC SMD
♦ LMI level "S" processing avail-
able
BLOCK DIAGRAM
11/91 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
1 11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
SG1543/SG2543/SG3543
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (+VIN)................................................. 40V
Sense Inputs ...................................................................... +VIN
SCR Trigger Current (Note 2) ......................................... 300mA
Indicator Output Sink Current .......................................... 50mA
Operating Junction Temperature
Hermetic (J, L Packages) ............................................ 150°C
Indicator Output Voltage ..................................................... 40V
Plastic (N, DW Packages) ........................................... 150°C
Note 1. Values beyond which damage may occur.
Storage Temperature Range ............................ -65°C to 150°C
Note 2. At higher input voltages, a dissipation limiting resistor, RG , is required. See Figure 1.
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, θJC .................. 35°C/W
Thermal Resistance-Junction to Ambient, θJA ............ 120°C/W
Note A.
Junction Temperature Calculation:
T
J
=
T
A
+
(P
D
x
θJA).
Note B. The above numbers for θJC are maximums for the limiting
thermal resistance of the package in a standard mount-
ing 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 2KΩ pull-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
V = 0V
REF
SG1543/2543
SG3543
Units
Min. Typ. Max. Min. Typ. Max.
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
11/91 Rev 1.1 2/94
Copyright © 1994
LINFINITY Microelectronics Inc.
2 11861 Western Avenue ∞ Garden Grove, CA 92841
(714) 898-8121 ∞ FAX: (714) 893-2570
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