SG1548/SG2548/SG3548 QUAD POWER FAULT MONITOR DESCRIPTION FEATURES 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. • • • • • • • • • • 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 LINFINITY 11/91 Rev 1.2 5/97 Copyright 1997 1 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 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 Inverting Op Amp Output Current .................................... 25mA Operating Junction Temperature Hermetic (J, L Packages) ............................................. 150°C Plastic (N, DW Packages) ............................................ 150°C Storage Temperature Range ............................ -65°C to 150°C Lead Temperature ........................................................... 300°C Note 1. Values beyond which damage may occur. 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, θ JC .................. 35°C/W Thermal Resistance-Junction to Ambient, θ JA ........... 120°C/W RECOMMENDED OPERATING CONDITIONS (Note Note A. Junction Temperature Calculation: TJ = TA + (PD x θJA). 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/pcboard system. All of the above assume no ambient airflow. 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 Line Sense Output Current Range ........................... 0 to 10mA Voltage Reference Output Current ........................... 0 to 10mA Operating Ambient Temperature Range SG1548 ......................................................... -55°C to 125°C SG2548 ........................................................... -25°C to 85°C SG3548 ............................................................... 0°C to 70°C Note 2. Range over which the device is functional. Note 3. Limited by inverter amplifier positive swing at -55°C. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures for SG1548 with -55 °C ≤ TA ≤ 125°C, SG2548 with -25°C ≤ TA ≤ 85°C, SG3548 with 0°C ≤ TA ≤ 70°C, 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 Test Conditions +VIN = 40V SG1548/2548 SG3548 Units Min. Typ. Max. Min. Typ. Max. 4.8 10 4.8 10 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 TJ = 25°C Over Temperature +VIN = 4.5V to 35V IL = 0 to 10mA VREF = 0V VPIN 1 = 1.5V to 2.45V -0.4 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 -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 mA V V mV mV mA µA V V V V µA dB Note 4. IL = 0mA LINFINITY 11/91 Rev 1.2 5/97 Copyright 1997 2 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 SG1548/SG2548/SG3548 ELECTRICAL CHARACTERISTICS (continued) 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 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 VPIN 8 = 0V IPIN 8 = 0mA IPIN 8 = 0mA ISOURCE = 5mA ISINK = 5mA RL = 10K 3.2 72 5 72 +VIN = 4.5V to 35V 2 15 -0.3 -1.0 3.5 1.0 1.9 100 15 25 100 3.2 72 5 72 2 -0.3 3.5 1.0 100 15 100 15 -1.0 1.9 25 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 VPIN 5 = Low to High VPIN 5 = 2.5V VCE = 40V IC = 10mA IE = 10mA IPIN 5 = 1mA IPIN 5 = -1mA Fault Logic Outputs (Each output) Collector Leakage Current VC = 40V Collector Saturation Voltage IC = 10mA 1 0.2 10 0.5 1 0.2 10 0.5 V mV µA V V mV µA V V dB mA dB V mV µA µA V V V V µA V Note 5. +VIN = 4.5V. APPLICATION INFORMATION SETTING THE FAULT TOLERANCE WINDOW MONITORING A NEGATIVE VOLTAGE 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). 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/µF . SCALING THE MONITORED SUPPLY VOLTAGES AC LINE MONITORING 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. 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. LINFINITY 11/91 Rev 1.2 5/97 Copyright 1997 3 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570 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 5µF delay capacitor provides 125 milliseconds of fault delay. CONNECTION DIAGRAMS & ORDERING INFORMATION Package 16-PIN CERAMIC DIP J - PACKAGE Part No. SG1548J/883B SG1548J SG2548J SG3548J Ambient Temperature Range -55°C to 125°C -55°C to 125°C -25°C to 85°C 0°C to 70°C 16-PIN PLASTIC DIP N - PACKAGE SG2548N SG3548N -25°C to 85°C 0°C to 70°C 16-PIN WIDE BODY PLASTIC S.O.I.C. DW - PACKAGE SG2548DW SG3548DW -25°C to 85°C 0°C to 70°C 20-PIN CERAMIC (LCC) LEADLESS CHIP CARRIER L- PACKAGE SG1548L/883B SG1548L (See Notes Below) -55°C to 125°C -55°C to 125°C Connection Diagram LOWER THRESHOLD GROUND 1 16 2 15 VREF +VIN LINE SENSE 3 14 4 13 5 12 EMITTER OUTPUT COLLECTOR OUTPUT 6 11 7 10 DELAY 8 9 INV. OUTPUT INV. INPUT SENSE 4 SENSE 3 SENSE 2 SENSE 1 U.V. FAULT O.V. FAULT LOWER THRESHOLD GROUND VREF +VIN LINE SENSE EMITTER OUTPUT COLLECTOR OUTPUT 1 16 2 15 3 14 4 13 5 12 6 11 7 10 DELAY 8 9 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 INV. OUTPUT INV. INPUT SENSE 4 SENSE 3 SENSE 2 SENSE 1 U.V. FAULT O.V. FAULT 20 19 4 18 5 17 6 16 7 15 8 14 9 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 10 11 12 13 Note 1. Contact factory for JAN and DESC product availability. 2. All parts are viewed from the top. LINFINITY 11/91 Rev 1.2 5/97 Copyright 1997 4 Microelectronics Inc. 11861 Western Avenue ∞ Garden Grove, CA 92841 (714) 898-8121 ∞ FAX: (714) 893-2570