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.
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)
Block Diagram
February
2015 Rev. 1.2
www.microsemi.com
© 2015 Microsemi Corporation
1
Absolute Maximum Ratings
(Note 1)
Input Supply Voltage (+V
IN
)................................................. 40V
Sense Inputs ...................................................................... +V
IN
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, R
G
is required. See Figure 1.
Indicator Output Sink Current ..........................................
Operating Junction Temperature
Hermetic (J, L Packages) ............................................
Plastic (N, DW Packages) ...........................................
Storage Temperature Range ............................ -65°C to
50mA
150°C
150°C
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,
θ
JC
............. 30°C/W
Thermal Resistance-Junction to Ambient,
θ
JA
.... .... 80°C/W
N Package:
Thermal Resistance-Junction to Case,
θ
JC
............. 40°C/W
Thermal Resistance-Junction to Ambient,
θ
JA
........ 65°C/W
DW Package:
Thermal Resistance-Junction to Case,
θ
JC
............. 40°C/W
Thermal Resistance-Junction to Ambient,
θ
JA
......... 95°C/W
L Package:
Thermal Resistance-Junction to Case, .................. 35°C/W
Thermal Resistance-Junction to Ambient,
θ
JA
....... 120°C/W
Note A. Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
θ
JA
).
Note B. The above numbers for
θ
JC
are maximums for the
limiting
thermal resistance of the package in a standard
mounting configuration. The
θ
JA
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 (+V
IN
) .................................... 4.7V to 40V
Current Limit Common Mode
Input Voltage Range ........................................... 0V to +V
IN
-3V
Reference Load Current ........................................... 0 to 10mA
Indicator Output Voltage ......................................... 4.7V to 40V
Indicator Output Current ........................................... 0 to 10mA
0 to 1µF
Delay Timing Capcitor
(Note 4)
...........................
Operating Ambient Temperature Range
SG1543 ....................................................... -55°C to 125°C
SG2543 ........................................................ -25°C to 85°C
0°C to 70°C
SG3543 ........................................................
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
≤
T
A
≤
125°C, SG2543 with
-25°C
≤
T
A
≤
85°C, SG3543 with 0°C
≤
T
A
≤
70°C, and +V
IN
= 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
T
J
= 25°C to T
MAX
+V
IN
= 40V, Outputs open, T
J
= 25°C
T
J
= 25°C
+V
IN
= 5 to 30V
I
REF
= 0 to 10mA
V
REF
= 0V
SG3543
SG1543/SG2543
Units
Min. Typ. Max. Min. Typ. Max.
4.5
4.7
40
40
10
4.5
4.7
40
40
10
V
V
mA
V
V
mV
mV
mA
%/°C
7
7
2.48 2.50 2.52 2.45 2.50 2.55
2.55 2.40
2.60
2.45
5
1
5
1
10
1
10
1
25
40
12
25
40
12
.005
.005
2
Electrical Characteristics
(Continued)
Parameter
Comparator Section
Input Threshold
(Note 5)
Input Hysteresis
Input Bias Current
Delay Saturation
Delay High Level
Delay Charging Current
Indicate Saturation
Indicate Leakage
Propagation Delay
T
J
= 25°C
Sense input = 0V
V
D
= 0V
I
L
= 10mA
V
IND
= 40V
V
O.V. INPUT
= 2.7V, V
U.V. INPUT
= 2.3V , T
J
= 25°C
C
D
= 0
C
D
= 1µF
+V
IN
= 5V, R
G
= 0, V
O
= 0
+V
IN
= 15V, I
O
= 100mA
+V
IN
= 40V, R
L
= 1kΩ
REM. ACT. pin = Gnd
REM. ACT pin open
RESET pin = Gnd, REM. ACT. = Gnd
RESET pin open, REM. ACT. = Gnd
R
L
= 50Ω, T
J
= 25°C, C
D
= 0
V
REM. ACT.
= 0.4V
V
O.V. INPUT
= 2.7V
OFFSET/COMP pin open, V
CM
= 0V
OFFSET/COMP pin open, V
CM
= 0V,
10kΩ from OFFSET/COMP pin to Gnd,T
J
=25°C
0
≤
V
CM
≤
12V, V
IN
= 15V
OFFSET/COMP pin open, V
CM
= 0V
I
L
= 10mA
V
IND
= 40V
A
V
= 0dB, T
J
= 25°C
V
OVERDRIVE
= 100mV, T
J
= 25°C
Test Conditions
SG1543/SG2543
SG3543
Units
Min. Typ. Max. Min. Typ. Max.
2.45 2.50 2.55 2.40 2.50 2.60
2.40
2.60 2.35
2.65
25
25
0.3 1.0
0.3 1.0
0.2 0.5
0.2 0.5
6
6
8
8
200 250 300 200 250 300
0.2 0.5
0.2 0.5
.01 1.0
0.1 1.0
400
10
100
12
200
13
0
0.4
2
0.4
2
400
300
500
400
0.1
0.8
6
0.8
6
100
12
400
10
200
13
0
0.4
2
0.4
2
400
300
500
400
V
V
mV
µA
V
V
µA
V
µA
ns
ms
mA
V
0.1
V
mA
0.8
6
V
0.8
mA
6
V
mA/µs
ns
ns
V
µA
mV
mV
dB
dB
V
µA
MHz
ns
SCR Trigger Section
Peak Output Current
Peak Output Voltage
Output Off Voltage
Remote Activate Current
Remote Activate Voltage
Reset Current
Reset Voltage
Output Current Rise Time
Prop. Delay from REM. ACT. Pin
Prop. Delay fom O.V. INPUT Pin
Current Limit Section
Input Voltage Range
Input Bias Current
Input Offset Voltage
CMRR
AVOL
Output Saturation
Output Leakage
Small Signal Bandwidth
Propagation Delay
0
80
60
72
0.3
0
100
70
80
0.2
.01
5
200
V
IN
-3V
1.0
10
120
0.5
1.0
0
70
60
72
0.3
0
100
70
80
0.2
.01
5
200
V
IN
-3V
1.0
15
130
0.5
1.0
Note 5. Input voltage rising on O.V. Input and falling on U.V. Input.
Characteristics Curves
10ms/µF
Figure
1
·
SCR Trigger Power Limiting
Figure
2
·
Activation Delay Vs. Capacitor Value
3
Characteristics Curves
(Continued)
R
L
=
2kΩ
1k
3k 5k
10k
30k 50k .1M
.3M .5M 1M
Figure
3
·
Comparator Input Hysteresis
Figure
4
·
Current Limit Input Threshold
R
T
= 100kΩ
R
L
=
2kΩ
R
L
=
2kΩ
R
T
= 30kΩ
R
T
= 10kΩ
10µF
Figure
5
·
Current Limit Amplifier Gain
Figure
6
·
Current Limit Amplifier Frequency Response
Application Information
Figure
7
·
Surge Limit Circuit for Large Delay Capacitors
Figure
8
·
Input Line Monitor
The 100 ohm resistor limits the peak discharge current into the
SG1543 while the external PNP transistor provides a high peak-current
discharge path for the delay capacitor.
4
Application Information
(Continued)
The values for the external components are
determined as follows:
Current limit input threshold, V
TH
≈
1000
R
1
C
S
is determined by the current loop dynamics
Peak current to load, I
P
≈
Short circuit current, I
SC
=
V
TH
V
O
+
R
SC
R
SC
V
TH
R
SC
(
R +R
)
R
2
2
3
Low output voltage limit, V
O
(Low) =
2.5 (R
4
+R
5
+R
6
)
R
5
+R
6
2.5 (R
4
+R
5
+R
6
)
High output voltage limit, V
O
(High) =
R
6
V
IN
- 5
0.2
Figure
9
·
Typical Application Circuit
Voltage sensing delay, t
D
= 10,000 C
D
SCR trigger power limiting resistor, R
G
>
Figure
10
·
Sensing Multiple Supply Voltages
Figure
11
·
Over Current Shutdown
5
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