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XR-3543 Datasheet Preview

XR-3543 Datasheet

Power Supply Output Supervisory Circuit

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XR-15/25/3543
Power Supply Output Supervisory Circuit
GENERAL DESCRIPTION
FUNCTIONAL BLOCK DIAGRAM
The XR-1543/2543/3543 are monolithic integrated cir-
cuits that contain all the functions necessary to monitor
and control the output of a power supply system. In-
cluded in the 16-Pin dual-in-line package is a voltage
reference, an operational amplifier, voltage compara-
tors, and a high-current SCR trigger circuit. The func-
tions performed by this device include over-voltage
senSing, under-voltage sensing and current limiting,
with provisions for triggering an external SCR "crow-
bar."
The internal voltage reference on the XR-1543 is guar-
anteed for an accuracy of ± 1% to eliminate the need
for external potentiometers. The entire circuit may be
powered from either the output that is being monitored
or from a separate bias voltage.
FEATURES
seR TRIGGER
REMOTE
ACTIVAlE
RESET
OVER·VOLTAGE
INDICATE
OIlER·VOLTAGE
DELAY
OVER·VOLTAGE
It-;PUT
UNDER·VOLTAGE
INPUT
UNDER·VOLTAGE
DELAY
GROUND
CL
OUTPUT
OFFSET\
COMPENSATION
CL NI
INPUT
CL INV
INPUT
UNDER-VOLTAGE
INDICATE
Over-Voltage Sensing Capability
Under-Voltage Sensing Capability
Current Limiting Capability
Reference Voltage Trimmed
SCR "Crowbar" Drive
Programmable Time Delays
Open Collector Outputs
and Remote Activation Capability
Total Standby current
± 1%
300 mA
Less than 10 mA
ORDERING INFORMATION
Part Number
XR-1543M
XR-2543N
XR-3543N
XR-3543P
Package
Ceramic
Ceramic
Ceramic
Plastic
Operating Temperature
- 55°C to + 125°C
-25°C to +85°C
O°C to + 70°C
O°C to + 70°C
APPLICATIONS
SYSTEM DESCRIPTION
DC/DC Converters
Switch Mode Power Supplies
Power Line Monitors
Linear Power Supplies
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage, VIN
40V
Sense Inputs
VIN
SCR Trigger Current (Note 1)
300 mA
Indicator Output Voltage
40V
Indicator Output Sink Current
50 mA
Power Dissipation (Ceramic)
1000 mW
Derate Above TA = + 25°C
8 mW/oC
Power Dissipation (Plastic)
625 mW
Derate Above TA = + 25°C
5 mW/oC
Operating Junction Temperature (TJ)
+ 150°C
Storage Temperature Range
-65°C to + 150°C
Note 1: At higher input voltages, a dissipation limiting
resistor, RG, is required.
An output supervisory cir~uit, such as the XR-1543, is
used to control and monitor the performance of a
power supply. In many systems, it is crucial that the
supply voltage is always within some minimum and
maximum level, to guarantee proper performance, and
to prevent damage to the system. If the supply voltage
is out of tolerance, it is often desirable to shut down the
system or to have some form of indication to the opera-
tor or system controller. As well as protecting the sys-
tem, the power supply sometimes needs to be protect-
ed under short circuit and current overload situations.
By providing an SCR "crowbar" on the output of a
power supply, it can be shut off under certain fault con-
ditions as well.
The over-voltage sensing circuit (O.V.) can be used to
monitor the output of a power supply and provide trig-
gering of an SCR, when lhe output goes above the pre-
scribed voltage level. The under-voltage sensing circuit
(U.v.) can be used to monitor either the output of a
power supply or the input line voltage.
5-147




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XR-3543 Datasheet

Power Supply Output Supervisory Circuit

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XR·15/25/3543
ELECTRICAL CHARACTERISTICS
Test Conditions: V,N = 10V, TA = full operating temperature range, unless otherwise specified. Refer to Figure 9 for component
designation.
XR-154312543
XR-3543
PARAMETERS
MIN TYP MAX
Input Voltage Range
Input Voltage Range
Supply Current
4.5
4.7
7
40
40
10
REFERENCE VOLTAGE SECTION (Pins 15 and 16)
Output Voltage
Output Voltage
Line Regulation
Load Regulation
Short Circuit Current
Temperature Stability
2.48
2.45
2.50
1
1
15
50
2.52
2.55
5
10
SCR TRIGGER SECTION (Pins 1, 2, and 3)
Peak Output Current
100 200
400
MIN TYP
4.5
4.7
7
2.45
2.40
2.50
1
1
15
50
100 200
Peak Output Voltage
Output OFF Voltage
Remote Activate Current
Remote Activate Voltage
Reset Current
12 13
0
0.4
2
0.4
0.1
0.8
6
0.8
12 13
0
0.4
2
0.4
Reset Voltage
26
2
Output Current Slew Rate
400
400
Propagation Delay Time
(From Pin 2)
Propagation Delay Time
(From Pin 6)
300
500
COMPARATOR SECTIONS (Pins 4, 5, 6, 7, 8, and 9)
Input Threshold
(Input Voltage Rising
2.45 2.50
on Pin 6 and
Falling on Pin 7)
2.40
Input Hysteresis
25
Input Bias Current
0.3
Delay Saturation
0.2
Delay High Level
6
Delay Charging Current
200 250
Indicate Saturation Voltage
0.2
Indicate Leakage Current
0.01
Propagation Delay Time
400
2.55
2.60
1.0
0.5
7
300
0.5
1.0
300
500
2.40
2.35
200
2.50
25
0.3
0.2
6
250
0.2
0.01
400
Propagation Delay Time
10
CURRENT LIMIT AMPLIFIER SECTION (Pins 10, 11, 12, and 13)
Input Voltage Range
Input Bias Current
Input Offset Voltage
Input Offset Voltage
Common Mode
0
VIN-3V
0
0.3 1.0
0 10
80 100
120
70
60 70
60
10
0.3
0
100
70
Rejection Ratio
Open Loop Gain
Output Saturation Voltage
Output Leakage Current
Small Signal Bandwidth
Propagation Delay Time
72 80
0.2
0.01
5
200
0.5
1.0
72 80
0.2
0.01
5
200
MAX
40
40
10
2.55
2.60
5
10
400
0.1
0.8
6
0.8
6
2.60
2.65
1.0
0.5
7
300
0.5
1.0
VIN-3V
1.0
15
130
0.5
1.0
UNIT
V
V
mA
V
V
mV
mV
mA
ppm/DC
mA
V
V
mA
V
mA
V
mAlp,s
nsec
nsec
V
V
mV
p,A
V
V
p,A
V
p,A
nsec
msec
V
p,A
mV
mV
dB
dB
V
p,A
MHz
nsec
CONDITIONS
TA = 25°C to max
TA = min to max
TA = 25°C, Y,N = 40V
TA = 25°C
TA = min to max
VIN = 5 to 30V
Iref = 0 to 10 mA
Vref = OV
VIN = 5V, RG = on,
Vo = 0
VIN = 15V, 10 = 100 mA
Y,N = 40V
Pin 2 = GND
Pin 2 = Open
Pin 2 = GND,
Pin 3 = GND
Pin 2 = GND,
Pin 3 = Open
TJ = 25°C, RL = 50n,
CD = 0
TJ = 25°C, RL = 50n
CD = 0, Pin 2 = O.4V
TJ = 25°C, RL = 50n,
CD = 0, Pin 6 = 2.7V
TJ = min to max
TJ == 25°C
Sense input = OV
VD = OV
'L == 10 mA
Vout = 40V
CD = 0
Pin 6 = 2.7V
Pin 7 == 2.3V
CD = 1 p,F TJ = 25°C
Pin 12 = Open, VCM = OV
Pin 12 = Open, VCM == OV
Pin 12 = 10 kO to GND
VIN = 15V, Os
VCM s 12V
VCM == OV, Pin 12 = Open
'L == 10 mA
Vout = 40V
TJ == 25°C, Av == 0 dB
TJ == 25°C,
Voverdrive = 100 mV
5-148


Part Number XR-3543
Description Power Supply Output Supervisory Circuit
Maker Exar
Total Page 8 Pages
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