View SG3548_157125.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

SG1548/SG2548/SG3548
QUAD POWER FAULT MONITOR
DESCRIPTION
The SG1548 is an integrated circuit capable of monitoring up to four positive DC supply voltages simultaneously for overvoltage and undervoltage fault conditions. An on-chip inverting op amp also allows monitoring one negative DC voltage. The fault tolerance window is accurately programmable from 5% to 40% using a simple divider network on the 2.5V reference. A single external capacitor sets the fault indication delay, eliminating false outputs due to switching noise, logic transition current spikes, and short-term AC line interruptions. An additional comparator referenced to 2.5V allows the AC line to be monitored for undervoltage conditions or for generation of a line clock. The comparator can also be used for programmable undervoltage lockout in a switching power supply. Uncommitted collector and emitter outputs permit both inverting and non-inverting operation. External availability of the precision 2.5V reference and open-collector logic outputs permit expansion to monitor additional voltage using available open-collector quad comparators.
FEATURES
* * * * * * * * * * Monitors four DC voltages and the AC line Precision 2.5V 1% low-drift reference Fault tolerance adjustable from 5% to 40% 3% trip threshold tolerance over temperature Separate 10mA, 40V overvoltage, undervoltage and AC line fault outputs Fault delay programmable with a single capacitor 30mV comparator hysteresis to prevent oscillations On-chip inverting op amp for negative voltage Open-collector output logic or expandability Operation from 4.5V to 40V supply
HIGH RELIABILITY FEATURES - SG1548
Available to MIL-STD-883 Radiation data available LMI level "S" processing available
BLOCK DIAGRAM
11/91 Rev 1.2 5/97
Copyright (c) 1997
1
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1548/SG2548/SG3548
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (+VIN) .......................................................... 40V Fault Output Collector Voltage ............................................ 40V Sense Input Voltage Range ................................. -0.3V to 6.0V Fault Output Sink Current ................................................ 20mA Line Sense Input Current ................................................. 1mA Inverting Op Amp Input Current ........................................ -5mA
Note 1. Values beyond which damage may occur.
Inverting Op Amp Output Current .................................... 25mA Operating Junction Temperature Hermetic (J, L Packages) ............................................. 150C Plastic (N, DW Packages) ............................................ 150C Storage Temperature Range ............................ -65C to 150C Lead Temperature ........................................................... 300C
THERMAL DATA
J Package: Thermal Resistance-Junction to Case, JC ................... 30C/W Thermal Resistance-Junction to Ambient, JA .............. 80C/W N Package: Thermal Resistance-Junction to Case, JC .................. 40C/W Thermal Resistance-Junction to Ambient, JA ............. 65C/W DW Package: Thermal Resistance-Junction to Case, JC .................. 40C/W Thermal Resistance-Junction to Ambient, JA ............. 95C/W L Package: Thermal Resistance-Junction to Case, JC .................. 35C/W Thermal Resistance-Junction to Ambient, JA ........... 120C/W
Note A. Junction Temperature Calculation: TJ = TA + (PD x JA). Note B. The above numbers for JC are maximums for the limiting
thermal resistance of the package in a standard mounting configuration. The JA numbers are meant to be guidelines for the thermal performance of the device/pcboard system. All of the above assume no ambient airflow.
RECOMMENDED OPERATING CONDITIONS (Note
2)
Supply Voltage Range 25% Maximum Fault Window (Note 3) .............. 4.5V to 35V 40% Maximum Fault Window ........................... 5.0V to 35V Lower Threshold Input Range ............................. 1.5V to 2.45V Fault Tolerance Window Range .......................... 5% to 40% Fault Output Sink Current Range ............................. 0 to 10mA
Note 2. Range over which the device is functional.
Line Sense Output Current Range ........................... 0 to 10mA Voltage Reference Output Current ........................... 0 to 10mA Operating Ambient Temperature Range SG1548 ......................................................... -55C to 125C SG2548 ........................................................... -25C to 85C SG3548 ............................................................... 0C to 70C
Note 3. Limited by inverter amplifier positive swing at -55C.
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1548 with -55 C TA 125C, SG2548 with -25C TA 85C, SG3548 with 0C TA 70C, and +VIN = 15V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter Supply Section Supply Current Reference Section (Note 4) Output Voltage Line Regulation Load Regulation Short Circuit Current Fault Window Generator Section Input Bias Current DC Sense Inputs Section Overvoltage Threshold Undervoltage Threshold Input Bias Current Threshold Supply Rejection
Note 4. IL = 0mA
Test Conditions +VIN = 40V TJ = 25C Over Temperature +VIN = 4.5V to 35V IL = 0 to 10mA VREF = 0V VPIN 1 = 1.5V to 2.45V VPIN 1 = 0.95 x VREF VPIN 1 = 0.60 x VREF VPIN 1 = 0.95 x VREF VPIN 1 = 0.60 x VREF VSENSE = 1.5V to 3.5V +VIN = 4.5V to 35V
SG1548/2548 SG3548 Units Min. Typ. Max. Min. Typ. Max. 4.8 10 4.8 10 mA V V mV mV mA A V V V V A dB
2.475 2.500 2.525 2.475 2.500 2.525 2.550 2.450 2.550 2.450 1 5 1 5 3 10 3 10 50 50 10 25 10 25 -0.4 -2.0 -0.4 -2.0
2.547 2.625 2.704 2.547 2.625 2.704 3.396 3.500 3.606 3.396 3.500 3.606 2.304 2.375 2.447 2.304 2.375 2.447 1.455 1.500 1.545 1.455 1.500 1.545 0.6 2.0 0.6 2.0 60 100 60 100
11/91 Rev 1.2 5/97
Copyright (c) 1997
2
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1548/SG2548/SG3548
ELECTRICAL CHARACTERISTICS
Parameter Fault Delay Section Comparator Threshold Comparator Hysteresis Delay Charging Current On Saturation Voltage OFF Clamp Voltage 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 AC Line Sense Section Comparator Threshold Comparator Hysteresis Input Bias Current Collector Leakage Current Collector Saturation Voltage Emitter Output Voltage Diode Clamp Voltage
(continued)
Test Conditions
SG1548/2548 SG3548 Units Min. Typ. Max. Min. Typ. Max. 1.200 1.250 1.300 1.200 1.250 1.300 25 25 32.5 50 67.5 32.5 50 67.5 0.1 0.2 0.1 0.2 +3.2 +3.6 +3.2 +3.6 2 15 -0.3 -1.0 3.5 1.0 1.9 100 15 25 100 2 -0.3 3.5 1.0 100 15 100 15 -1.0 1.9 25 V mV A V V mV A V V dB mA dB V mV A A V V V V A V
VPIN 8 = 0V IPIN 8 = 0mA IPIN 8 = 0mA
ISOURCE = 5mA ISINK = 5mA RL = 10K +VIN = 4.5V to 35V VPIN 5 = Low to High VPIN 5 = 2.5V VCE = 40V IC = 10mA IE = 10mA IPIN 5 = 1mA IPIN 5 = -1mA
3.2 72 5 72
3.2 72 5 72
2.440 2.500 2.560 2.440 2.500 2.560 25 25 2 1 1 2 1 10 1 10 0.2 0.5 0.2 0.5 12 13 12 13 6.0 7.5 7.5 6.0 -1.0 -0.3 -0.3 -1.0 1 0.2 10 0.5 1 0.2 10 0.5
Fault Logic Outputs (Each output) Collector Leakage Current VC = 40V Collector Saturation Voltage IC = 10mA
Note 5. +VIN = 4.5V.
APPLICATION INFORMATION
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.
11/91 Rev 1.2 5/97
Copyright (c) 1997
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-oftolerance 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/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.
3
11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
SG1548/SG2548/SG3548
APPLICATION EXAMPLE
In this example, the SG1548 simultaneously monitors four DC voltages: +5V, +24V, and 15V. Three different fault tolerances are programmed: 5% on the two 15V supplies, 10% on the +5V supply, and 20% on the +24V supply. The 5F delay capacitor provides 125 milliseconds of fault delay.
CONNECTION DIAGRAMS & ORDERING INFORMATION
Package
16-PIN CERAMIC DIP J - PACKAGE
(See Notes Below)
Part No. SG1548J/883B SG1548J SG2548J SG3548J SG2548N SG3548N SG2548DW SG3548DW
Ambient Temperature Range -55C to 125C -55C to 125C -25C to 85C 0C to 70C -25C to 85C 0C to 70C -25C to 85C 0C to 70C
Connection Diagram
LOWER THRESHOLD GROUND VREF +VIN LINE SENSE EMITTER OUTPUT COLLECTOR OUTPUT DELAY
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
INV. OUTPUT INV. INPUT SENSE 4 SENSE 3 SENSE 2 SENSE 1 U.V. FAULT O.V. FAULT
16-PIN PLASTIC DIP N - PACKAGE 16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE
LOWER THRESHOLD GROUND VREF +VIN LINE SENSE EMITTER OUTPUT COLLECTOR OUTPUT DELAY
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
INV. OUTPUT INV. INPUT SENSE 4 SENSE 3 SENSE 2 SENSE 1 U.V. FAULT O.V. FAULT
20-PIN CERAMIC (LCC) LEADLESS CHIP CARRIER L- PACKAGE
SG1548L/883B SG1548L
-55C to 125C -55C to 125C
1. N.C. 2. LOWER THRESHOLD 3. GROUND 4. VREF 5. +VIN 6. N.C. 7. LINE SENSE 8. EMITTER OUTPUT 9. COLLECTOR OUTPUT 10.DELAY
3
2
1
20 19
4 5 6 7 8
18 17 16 15 14
11. 12. 13. 14. 15. 16. 17. 18. 19. 20.
N.C. O.V. FAULT U.V. FAULT SENSE 1 SENSE 2 N.C. SENSE 3 SENSE 4 INV. INPUT INV. OUTPUT
9
10 11 12 13
Note 1. Contact factory for JAN and DESC product availability. 2. All parts are viewed from the top. 11/91 Rev 1.2 5/97
Copyright (c) 1997 11861 Western Avenue Garden Grove, CA 92841 (714) 898-8121 FAX: (714) 893-2570
LINFINITY
Microelectronics Inc.
4

▲Up To Search▲

Price & Availability of SG3548

	To Download SG3548 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .