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SG1548 Datasheet(PDF) 1 Page - Microsemi Corporation |
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SG1548 Datasheet(HTML) 1 Page - Microsemi Corporation |
1 / 4 page Rev 1.2a 3.19.2005 Microsemi, Inc. - Integrated Products Copyright © 1997 11861 Western Avenue ∞ ∞ ∞ ∞ ∞ Garden Grove, CA 92841 1 (714) 898-8121 ∞ ∞ ∞ ∞ ∞ FAX: (714) 893-2570 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 interrup- tions. 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 oscilla- tions ••••• 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 |
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