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| 型號： | SG3548 |
| 廠商： | Microsemi Corporation |
| 英文描述： | QUAD POWER FAULT MONITOR |
| 中文描述： | 四電源故障監(jiān)控 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 66K |
| 代理商： | SG3548 |
11/91 Rev 1.2 5/97
Copyright
1997
L
IN
F
IN
ITY
Microelectronics Inc.
11861 Western Avenue
∞
∞
Garden Grove, CA 92841
(714) 898-8121
∞
FAX: (714) 893-2570
3
Fault Logic Outputs (Each output)
Collector Leakage Current
Collector Saturation Voltage
V
= 40V
I
C
= 10mA
2.500
25
1
1
0.2
13
AC Line Sense Section
Comparator Threshold
Comparator Hysteresis
Input Bias Current
Collector Leakage Current
Collector Saturation Voltage
Emitter Output Voltage
Diode Clamp Voltage
V
PIN 5
= Low to High
V
PIN 5
= 2.5V
V
= 40V
I
C
= 10mA
I
E
= 10mA
I
PIN 5
= 1mA
I
PIN 5
= -1mA
2.440
12
6.0
-0.3
2.560
2
10
0.5
7.5
-1.0
2.440
12
6.0
-0.3
2.500
25
1
1
0.2
13
2
-0.3
3.5
1.0
100
15
100
3.2
72
5
72
Inverting Op Amp Section
(Note 5)
Input Offset Voltage
Input Bias Current
Output High Voltage
Output Low Voltage
Large Signal Voltage Gain
Output Source Current
Power Supply Rejection Ratio
I
SOURCE
= 5mA
I
SINK
R
L
= 10K
+V
IN
= 4.5V to 35V
mV
μ
A
V
V
dB
mA
dB
1.250
25
50
0.1
+3.2
1.200
32.5
V
PIN 8
= 0V
I
PIN 8
= 0mA
I
PIN 8
= 0mA
Comparator Threshold
Comparator Hysteresis
Delay Charging Current
On Saturation Voltage
OFF Clamp Voltage
SG1548/SG2548/SG3548
Min. Typ. Max.
SG3548
SG1548/2548
Min. Typ. Max.
Test Conditions
Parameter
Units
ELECTRICAL CHARACTERISTICS
(continued)
APPLICATION INFORMATION
Note 5. +V
IN
= 4.5V.
Fault Delay Section
1.300
67.5
0.2
+3.6
1.200
32.5
1.250
25
50
0.1
+3.2
1.300
67.5
0.2
+3.6
V
mV
μ
A
V
V
15
-1.0
1.9
25
3.2
72
5
72
2
-0.3
3.5
1.0
100
15
100
15
-1.0
1.9
25
2.560
2
10
0.5
7.5
-1.0
V
mV
μ
A
μ
A
V
V
V
V
μ
A
V
10
0.5
1
0.2
10
0.5
1
0.2
SETTING THE FAULT TOLERANCE WINDOW
The fault tolerance window is set by applying a voltage less than
the +2.50Vreference to the Lower Threshold input (Pin 1). The
voltage is obtained by a resistor divider from the reference (Pin 3)
to ground. If ±5% tolerance is desired, then 95% of the reference
(+2.375V) is applied to Pin 1. If ±40% is wanted, then 60% of the
reference (+1.50V) is applied. In the example on the back page,
the tolerance is ±5%. The nominal overvoltage and undervoltage
thresholds are centered about the reference at +2.625V and
+2.375V (+2.500V ±0.125V).
SCALING THE MONITORED SUPPLY VOLTAGES
Each positive voltage to be monitored is divided down to +2.50V
with a resistor network and connected to one of the Sense inputs.
Unused Sense inputs should be connected to the reference. This
will not increase the bias current. A variation of the monitored
voltages out of the programmed tolerance range will cause the
appropriate overvoltage or undervoltage fault output to switch
LOW. The effective tolerance on any input may be broadened
with an additional resistor to the voltage reference. The example
on the back page shows a ±10% tolerance on the +5Vsupply
although the SG1548 is programmed for a ±5% tolerance. The
procedure for calculating the resistor value is found in the
SG1548 Application Note.
MONITORING A NEGATIVE VOLTAGE
A negative voltage can be converted to a positive one and
simultaneously scaled to +2.50V by using the internal operational
amplifier as an inverter. Only an input resistor and feedback
resistor are required.
SETTING THE FAULT DELAY
A single capacitor at the Delay pin sets the time an out-of-
tolerance fault must persist before a fault is actually declared.
This feature allows switching noise on the supplies to be rejected.
The delay time is given by: Delay = 25ms/
μ
F .
AC LINE MONITORING
The AC line voltage can be monitored for single-cycle dropouts
with the few components shown in the example. A half-wave
rectifier charges the capacitor on positive line cycles. After the
positive peak and during the negative line cycle the capacitor
discharges from a fixed voltage controlled by the internal Zener
diode. If a positive cycle is missing, the capacitor discharges to
below the +2.5V trip point of the comparator, causing the output
transistor to turn on.
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| SG3548DW | 制造商:Microsemi Corporation 功能描述:Volt Supervisor Monitor -15V/5V/15V/24V 16-Pin SOWB 制造商:Microsemi Corporation 功能描述:DC:AC-PRGMBL. QUAD LINE FAULT MONITOR - Bulk |
| SG3548J | 制造商:Microsemi Corporation 功能描述:DC:AC-PRGMBL. QUAD LINE FAULT MONITOR - Bulk |
| SG3548N | 制造商:Microsemi Corporation 功能描述:DC:AC-PRGMBL. QUAD LINE FAULT MONITOR - Bulk |
| SG3549 | 制造商:MICROSEMI 制造商全稱:Microsemi Corporation 功能描述:CURRENT SENSE LATCH |
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