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SG2548J Datasheet(PDF) 3 Page - Microsemi Corporation |
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SG2548J Datasheet(HTML) 3 Page - Microsemi Corporation |
3 / 4 page Rev 1.2a Copyright © 1997 11861 Western Avenue ∞ ∞ ∞ ∞ ∞ Garden Grove, CA 92841 3 (714) 898-8121 ∞ ∞ ∞ ∞ ∞ FAX: (714) 893-2570 Fault Logic Outputs (Each output) V C = 40V I C = 10mA Collector Leakage Current Collector Saturation Voltage 2.500 25 1 1 0.2 13 AC Line Sense Section V PIN 5 = Low to High V PIN 5 = 2.5V V CE = 40V I C = 10mA I E = 10mA I PIN 5 = 1mA I PIN 5 = -1mA Comparator Threshold Comparator Hysteresis Input Bias Current Collector Leakage Current Collector Saturation Voltage Emitter Output Voltage Diode Clamp Voltage 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) I SOURCE = 5mA I SINK = 5mA R L = 10K +V IN = 4.5V to 35V Input Offset Voltage Input Bias Current Output High Voltage Output Low Voltage Large Signal Voltage Gain Output Source Current Power Supply Rejection Ratio mV µA 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 Test Conditions Parameter Units ELECTRICAL CHARACTERISTICS (continued) Min. Typ. Max. 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 µA 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 µA µA V V V V µA 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/ µF . 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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